1552 lines
63 KiB
Java
1552 lines
63 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.text;
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import java.util.ArrayList;
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import java.util.Enumeration;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Properties;
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import org.apache.commons.lang3.Validate;
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import org.apache.commons.text.lookup.StringLookup;
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import org.apache.commons.text.lookup.StringLookupFactory;
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import org.apache.commons.text.matcher.StringMatcher;
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import org.apache.commons.text.matcher.StringMatcherFactory;
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import org.checkerframework.checker.index.qual.*;
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/**
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* Substitutes variables within a string by values.
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* <p>
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* This class takes a piece of text and substitutes all the variables within it. The default definition of a variable is
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* {@code ${variableName}}. The prefix and suffix can be changed via constructors and set methods.
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* </p>
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* <p>
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* Variable values are typically resolved from a map, but could also be resolved from system properties, or by supplying
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* a custom variable resolver.
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* </p>
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* <h2>Using System Properties</h2>
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* <p>
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* The simplest example is to use this class to replace Java System properties. For example:
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* </p>
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*
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* <pre>
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* StringSubstitutor
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* .replaceSystemProperties("You are running with java.version = ${java.version} and os.name = ${os.name}.");
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* </pre>
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*
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* <h2>Using a Custom Map</h2>
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* <p>
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* Typical usage of this class follows the following pattern:
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* </p>
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* <ul>
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* <li>Create and initialize a StringSubstitutor with the map that contains the values for the variables you want to
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* make available.</li>
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* <li>Optionally set attributes like variable prefix, variable suffix, default value delimiter, and so on.</li>
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* <li>Call the {@code replace()} method with in the source text for interpolation.</li>
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* <li>The returned text contains all variable references (as long as their values are known) as resolved.</li>
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* </ul>
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* <p>
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* For example:
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* </p>
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*
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* <pre>
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* // Build map
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* Map<String, String> valuesMap = new HashMap<>();
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* valuesMap.put("animal", "quick brown fox");
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* valuesMap.put("target", "lazy dog");
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* String templateString = "The ${animal} jumped over the ${target}.";
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*
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* // Build StringSubstitutor
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* StringSubstitutor sub = new StringSubstitutor(valuesMap);
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*
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* // Replace
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* String resolvedString = sub.replace(templateString);
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* </pre>
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*
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* <p>
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* yielding:
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* </p>
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*
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* <pre>
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* "The quick brown fox jumped over the lazy dog."
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* </pre>
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*
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* <h2>Providing Default Values</h2>
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* <p>
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* You can set a default value for unresolved variables. The default value for a variable can be appended to the
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* variable name after the variable default value delimiter. The default value of the variable default value delimiter
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* is ":-", as in bash and other *nix shells.
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* </p>
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* <p>
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* You can set the variable value delimiter with {@link #setValueDelimiterMatcher(StringMatcher)},
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* {@link #setValueDelimiter(char)} or {@link #setValueDelimiter(String)}.
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* </p>
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* <p>
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* For example:
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* </p>
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*
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* <pre>
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* // Build map
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* Map<String, String> valuesMap = new HashMap<>();
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* valuesMap.put("animal", "quick brown fox");
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* valuesMap.put("target", "lazy dog");
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* String templateString = "The ${animal} jumped over the ${target} ${undefined.number:-1234567890} times.";
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*
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* // Build StringSubstitutor
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* StringSubstitutor sub = new StringSubstitutor(valuesMap);
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*
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* // Replace
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* String resolvedString = sub.replace(templateString);
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* </pre>
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*
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* <p>
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* yielding:
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* </p>
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*
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* <pre>
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* "The quick brown fox jumped over the lazy dog 1234567890 times."
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* </pre>
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*
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* <p>
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* {@code StringSubstitutor} supports throwing exceptions for unresolved variables, you enable this by setting calling
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* {@link #setEnableUndefinedVariableException(boolean)} with {@code true}.
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* </p>
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*
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* <h2>Reusing Instances</h2>
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* <p>
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* Static shortcut methods cover the most common use cases. If multiple replace operations are to be performed, creating
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* and reusing an instance of this class will be more efficient.
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* </p>
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*
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* <h2>Using Interpolation</h2>
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* <p>
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* The default interpolator lets you use string lookups like:
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* </p>
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*
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* <pre>
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* final StringSubstitutor interpolator = StringSubstitutor.createInterpolator();
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* final String text = interpolator.replace(
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* "Base64 Decoder: ${base64Decoder:SGVsbG9Xb3JsZCE=}\n"
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* + "Base64 Encoder: ${base64Encoder:HelloWorld!}\n"
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* + "Java Constant: ${const:java.awt.event.KeyEvent.VK_ESCAPE}\n"
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* + "Date: ${date:yyyy-MM-dd}\n"
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* + "Environment Variable: ${env:USERNAME}\n"
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* + "File Content: ${file:UTF-8:src/test/resources/document.properties}\n"
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* + "Java: ${java:version}\n"
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* + "Localhost: ${localhost:canonical-name}\n"
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* + "Properties File: ${properties:src/test/resources/document.properties::mykey}\n"
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* + "Resource Bundle: ${resourceBundle:org.apache.commons.text.example.testResourceBundleLookup:mykey}\n"
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* + "System Property: ${sys:user.dir}\n"
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* + "URL Decoder: ${urlDecoder:Hello%20World%21}\n"
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* + "URL Encoder: ${urlEncoder:Hello World!}\n"
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* + "XML XPath: ${xml:src/test/resources/document.xml:/root/path/to/node}\n");
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* </pre>
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* <p>
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* For documentation and a full list of available lookups, see {@link StringLookupFactory}.
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* </p>
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* <p><strong>NOTE:</strong> The list of lookups available by default in {@link #createInterpolator()} changed
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* in version {@code 1.10.0}. See the {@link StringLookupFactory} documentation for details and an explanation
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* on how to reproduce the previous functionality.
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* </p>
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*
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* <h2>Using Recursive Variable Replacement</h2>
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* <p>
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* Variable replacement can work recursively by calling {@link #setEnableSubstitutionInVariables(boolean)} with
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* {@code true}. If a variable value contains a variable then that variable will also be replaced. Cyclic replacements
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* are detected and will throw an exception.
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* </p>
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* <p>
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* You can get the replace result to contain a variable prefix. For example:
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* </p>
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*
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* <pre>
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* "The variable ${${name}} must be used."
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* </pre>
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*
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* <p>
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* If the value of the "name" variable is "x", then only the variable "name" is replaced resulting in:
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* </p>
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*
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* <pre>
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* "The variable ${x} must be used."
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* </pre>
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*
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* <p>
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* To achieve this effect there are two possibilities: Either set a different prefix and suffix for variables which do
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* not conflict with the result text you want to produce. The other possibility is to use the escape character, by
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* default '$'. If this character is placed before a variable reference, this reference is ignored and won't be
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* replaced. For example:
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* </p>
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*
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* <pre>
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* "The variable $${${name}} must be used."
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* </pre>
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* <p>
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* In some complex scenarios you might even want to perform substitution in the names of variables, for instance
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* </p>
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*
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* <pre>
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* ${jre-${java.specification.version}}
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* </pre>
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*
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* <p>
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* {@code StringSubstitutor} supports this recursive substitution in variable names, but it has to be enabled explicitly
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* by calling {@link #setEnableSubstitutionInVariables(boolean)} with {@code true}.
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* </p>
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*
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* <h2>Thread Safety</h2>
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* <p>
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* This class is <b>not</b> thread safe.
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* </p>
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*
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* @since 1.3
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*/
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public class StringSubstitutor {
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/**
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* The low-level result of a substitution.
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*
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* @since 1.9
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*/
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private static final class Result {
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/** Whether the buffer is altered. */
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public final boolean altered;
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/** The length of change. */
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public final int lengthChange;
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private Result(final boolean altered, final int lengthChange) {
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this.altered = altered;
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this.lengthChange = lengthChange;
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}
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@Override
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public String toString() {
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return "Result [altered=" + altered + ", lengthChange=" + lengthChange + "]";
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}
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}
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/**
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* Constant for the default escape character.
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*/
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public static final char DEFAULT_ESCAPE = '$';
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/**
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* The default variable default separator.
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*
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* @since 1.5.
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*/
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public static final String DEFAULT_VAR_DEFAULT = ":-";
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/**
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* The default variable end separator.
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*
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* @since 1.5.
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*/
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public static final String DEFAULT_VAR_END = "}";
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/**
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* The default variable start separator.
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*
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* @since 1.5.
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*/
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public static final String DEFAULT_VAR_START = "${";
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/**
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* Constant for the default variable prefix.
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*/
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public static final StringMatcher DEFAULT_PREFIX = StringMatcherFactory.INSTANCE.stringMatcher(DEFAULT_VAR_START);
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/**
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* Constant for the default variable suffix.
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*/
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public static final StringMatcher DEFAULT_SUFFIX = StringMatcherFactory.INSTANCE.stringMatcher(DEFAULT_VAR_END);
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/**
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* Constant for the default value delimiter of a variable.
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*/
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public static final StringMatcher DEFAULT_VALUE_DELIMITER = StringMatcherFactory.INSTANCE
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.stringMatcher(DEFAULT_VAR_DEFAULT);
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/**
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* Creates a new instance using the interpolator string lookup
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* {@link StringLookupFactory#interpolatorStringLookup()}.
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* <p>
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* This StringSubstitutor lets you perform substitutions like:
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* </p>
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*
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* <pre>
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* StringSubstitutor.createInterpolator().replace(
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* "OS name: ${sys:os.name}, user: ${env:USER}");
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* </pre>
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*
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* <p>The table below lists the lookups available by default in the returned instance. These
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* may be modified through the use of the {@value StringLookupFactory#DEFAULT_STRING_LOOKUPS_PROPERTY}
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* system property, as described in the {@link StringLookupFactory} documentation.</p>
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*
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* <p><strong>NOTE:</strong> The list of lookups available by default changed in version {@code 1.10.0}.
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* Configuration via system property (as mentioned above) may be necessary to reproduce previous functionality.
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* </p>
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*
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* <table>
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* <caption>Default Lookups</caption>
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* <tr>
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* <th>Key</th>
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* <th>Lookup</th>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_BASE64_DECODER}</td>
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* <td>{@link StringLookupFactory#base64DecoderStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_BASE64_ENCODER}</td>
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* <td>{@link StringLookupFactory#base64EncoderStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_CONST}</td>
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* <td>{@link StringLookupFactory#constantStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_DATE}</td>
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* <td>{@link StringLookupFactory#dateStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_ENV}</td>
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* <td>{@link StringLookupFactory#environmentVariableStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_FILE}</td>
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* <td>{@link StringLookupFactory#fileStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_JAVA}</td>
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* <td>{@link StringLookupFactory#javaPlatformStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_LOCALHOST}</td>
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* <td>{@link StringLookupFactory#localHostStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_PROPERTIES}</td>
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* <td>{@link StringLookupFactory#propertiesStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_RESOURCE_BUNDLE}</td>
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* <td>{@link StringLookupFactory#resourceBundleStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_SYS}</td>
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* <td>{@link StringLookupFactory#systemPropertyStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_URL_DECODER}</td>
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* <td>{@link StringLookupFactory#urlDecoderStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_URL_ENCODER}</td>
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* <td>{@link StringLookupFactory#urlEncoderStringLookup()}</td>
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* </tr>
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* <tr>
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* <td>{@value StringLookupFactory#KEY_XML}</td>
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* <td>{@link StringLookupFactory#xmlStringLookup()}</td>
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* </tr>
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* </table>
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*
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* @return a new instance using the interpolator string lookup.
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* @see StringLookupFactory#interpolatorStringLookup()
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* @since 1.8
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*/
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public static StringSubstitutor createInterpolator() {
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return new StringSubstitutor(StringLookupFactory.INSTANCE.interpolatorStringLookup());
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}
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/**
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* Replaces all the occurrences of variables in the given source object with their matching values from the map.
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*
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* @param <V> the type of the values in the map
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* @param source the source text containing the variables to substitute, null returns null
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* @param valueMap the map with the values, may be null
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* @return The result of the replace operation
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* @throws IllegalArgumentException if a variable is not found and enableUndefinedVariableException is true
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*/
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public static <V> String replace(final Object source, final Map<String, V> valueMap) {
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return new StringSubstitutor(valueMap).replace(source);
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}
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/**
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* Replaces all the occurrences of variables in the given source object with their matching values from the map.
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* This method allows to specify a custom variable prefix and suffix
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*
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* @param <V> the type of the values in the map
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* @param source the source text containing the variables to substitute, null returns null
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* @param valueMap the map with the values, may be null
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* @param prefix the prefix of variables, not null
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* @param suffix the suffix of variables, not null
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* @return The result of the replace operation
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* @throws IllegalArgumentException if the prefix or suffix is null
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* @throws IllegalArgumentException if a variable is not found and enableUndefinedVariableException is true
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*/
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public static <V> String replace(final Object source, final Map<String, V> valueMap, final String prefix,
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final String suffix) {
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return new StringSubstitutor(valueMap, prefix, suffix).replace(source);
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}
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/**
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* Replaces all the occurrences of variables in the given source object with their matching values from the
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* properties.
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*
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* @param source the source text containing the variables to substitute, null returns null
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* @param valueProperties the properties with values, may be null
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* @return The result of the replace operation
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* @throws IllegalArgumentException if a variable is not found and enableUndefinedVariableException is true
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*/
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public static String replace(final Object source, final Properties valueProperties) {
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if (valueProperties == null) {
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return source.toString();
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}
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final Map<String, String> valueMap = new HashMap<>();
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final Enumeration<?> propNames = valueProperties.propertyNames();
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while (propNames.hasMoreElements()) {
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final String propName = String.valueOf(propNames.nextElement());
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final String propValue = valueProperties.getProperty(propName);
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valueMap.put(propName, propValue);
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}
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return StringSubstitutor.replace(source, valueMap);
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}
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/**
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* Replaces all the occurrences of variables in the given source object with their matching values from the system
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* properties.
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*
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* @param source the source text containing the variables to substitute, null returns null
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* @return The result of the replace operation
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* @throws IllegalArgumentException if a variable is not found and enableUndefinedVariableException is true
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*/
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public static String replaceSystemProperties(final Object source) {
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return new StringSubstitutor(StringLookupFactory.INSTANCE.systemPropertyStringLookup()).replace(source);
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}
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/**
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* The flag whether substitution in variable values is disabled.
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*/
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private boolean disableSubstitutionInValues;
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/**
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* The flag whether substitution in variable names is enabled.
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*/
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private boolean enableSubstitutionInVariables;
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/**
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* The flag whether exception should be thrown on undefined variable.
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*/
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private boolean enableUndefinedVariableException;
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/**
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* Stores the escape character.
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*/
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private char escapeChar;
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/**
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* Stores the variable prefix.
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*/
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private StringMatcher prefixMatcher;
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/**
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* Whether escapes should be preserved. Default is false;
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*/
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private boolean preserveEscapes;
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/**
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* Stores the variable suffix.
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*/
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private StringMatcher suffixMatcher;
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/**
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* Stores the default variable value delimiter.
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*/
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private StringMatcher valueDelimiterMatcher;
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/**
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* Variable resolution is delegated to an implementor of {@link StringLookup}.
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*/
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private StringLookup variableResolver;
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/**
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* Creates a new instance with defaults for variable prefix and suffix and the escaping character.
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*/
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public StringSubstitutor() {
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this((StringLookup) null, DEFAULT_PREFIX, DEFAULT_SUFFIX, DEFAULT_ESCAPE);
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}
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/**
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|
* Creates a new instance and initializes it. Uses defaults for variable prefix and suffix and the escaping
|
|
* character.
|
|
*
|
|
* @param <V> the type of the values in the map
|
|
* @param valueMap the map with the variables' values, may be null
|
|
*/
|
|
public <V> StringSubstitutor(final Map<String, V> valueMap) {
|
|
this(StringLookupFactory.INSTANCE.mapStringLookup(valueMap), DEFAULT_PREFIX, DEFAULT_SUFFIX, DEFAULT_ESCAPE);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it. Uses a default escaping character.
|
|
*
|
|
* @param <V> the type of the values in the map
|
|
* @param valueMap the map with the variables' values, may be null
|
|
* @param prefix the prefix for variables, not null
|
|
* @param suffix the suffix for variables, not null
|
|
* @throws IllegalArgumentException if the prefix or suffix is null
|
|
*/
|
|
public <V> StringSubstitutor(final Map<String, V> valueMap, final String prefix, final String suffix) {
|
|
this(StringLookupFactory.INSTANCE.mapStringLookup(valueMap), prefix, suffix, DEFAULT_ESCAPE);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it.
|
|
*
|
|
* @param <V> the type of the values in the map
|
|
* @param valueMap the map with the variables' values, may be null
|
|
* @param prefix the prefix for variables, not null
|
|
* @param suffix the suffix for variables, not null
|
|
* @param escape the escape character
|
|
* @throws IllegalArgumentException if the prefix or suffix is null
|
|
*/
|
|
public <V> StringSubstitutor(final Map<String, V> valueMap, final String prefix, final String suffix,
|
|
final char escape) {
|
|
this(StringLookupFactory.INSTANCE.mapStringLookup(valueMap), prefix, suffix, escape);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it.
|
|
*
|
|
* @param <V> the type of the values in the map
|
|
* @param valueMap the map with the variables' values, may be null
|
|
* @param prefix the prefix for variables, not null
|
|
* @param suffix the suffix for variables, not null
|
|
* @param escape the escape character
|
|
* @param valueDelimiter the variable default value delimiter, may be null
|
|
* @throws IllegalArgumentException if the prefix or suffix is null
|
|
*/
|
|
public <V> StringSubstitutor(final Map<String, V> valueMap, final String prefix, final String suffix,
|
|
final char escape, final String valueDelimiter) {
|
|
this(StringLookupFactory.INSTANCE.mapStringLookup(valueMap), prefix, suffix, escape, valueDelimiter);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it.
|
|
*
|
|
* @param variableResolver the variable resolver, may be null
|
|
*/
|
|
public StringSubstitutor(final StringLookup variableResolver) {
|
|
this(variableResolver, DEFAULT_PREFIX, DEFAULT_SUFFIX, DEFAULT_ESCAPE);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it.
|
|
*
|
|
* @param variableResolver the variable resolver, may be null
|
|
* @param prefix the prefix for variables, not null
|
|
* @param suffix the suffix for variables, not null
|
|
* @param escape the escape character
|
|
* @throws IllegalArgumentException if the prefix or suffix is null
|
|
*/
|
|
public StringSubstitutor(final StringLookup variableResolver, final String prefix, final String suffix,
|
|
final char escape) {
|
|
this.setVariableResolver(variableResolver);
|
|
this.setVariablePrefix(prefix);
|
|
this.setVariableSuffix(suffix);
|
|
this.setEscapeChar(escape);
|
|
this.setValueDelimiterMatcher(DEFAULT_VALUE_DELIMITER);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it.
|
|
*
|
|
* @param variableResolver the variable resolver, may be null
|
|
* @param prefix the prefix for variables, not null
|
|
* @param suffix the suffix for variables, not null
|
|
* @param escape the escape character
|
|
* @param valueDelimiter the variable default value delimiter string, may be null
|
|
* @throws IllegalArgumentException if the prefix or suffix is null
|
|
*/
|
|
public StringSubstitutor(final StringLookup variableResolver, final String prefix, final String suffix,
|
|
final char escape, final String valueDelimiter) {
|
|
this.setVariableResolver(variableResolver);
|
|
this.setVariablePrefix(prefix);
|
|
this.setVariableSuffix(suffix);
|
|
this.setEscapeChar(escape);
|
|
this.setValueDelimiter(valueDelimiter);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it.
|
|
*
|
|
* @param variableResolver the variable resolver, may be null
|
|
* @param prefixMatcher the prefix for variables, not null
|
|
* @param suffixMatcher the suffix for variables, not null
|
|
* @param escape the escape character
|
|
* @throws IllegalArgumentException if the prefix or suffix is null
|
|
*/
|
|
public StringSubstitutor(final StringLookup variableResolver, final StringMatcher prefixMatcher,
|
|
final StringMatcher suffixMatcher, final char escape) {
|
|
this(variableResolver, prefixMatcher, suffixMatcher, escape, DEFAULT_VALUE_DELIMITER);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance and initializes it.
|
|
*
|
|
* @param variableResolver the variable resolver, may be null
|
|
* @param prefixMatcher the prefix for variables, not null
|
|
* @param suffixMatcher the suffix for variables, not null
|
|
* @param escape the escape character
|
|
* @param valueDelimiterMatcher the variable default value delimiter matcher, may be null
|
|
* @throws IllegalArgumentException if the prefix or suffix is null
|
|
*/
|
|
public StringSubstitutor(final StringLookup variableResolver, final StringMatcher prefixMatcher,
|
|
final StringMatcher suffixMatcher, final char escape, final StringMatcher valueDelimiterMatcher) {
|
|
this.setVariableResolver(variableResolver);
|
|
this.setVariablePrefixMatcher(prefixMatcher);
|
|
this.setVariableSuffixMatcher(suffixMatcher);
|
|
this.setEscapeChar(escape);
|
|
this.setValueDelimiterMatcher(valueDelimiterMatcher);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance based on the given StringSubstitutor.
|
|
*
|
|
* @param other The StringSubstitutor used as the source.
|
|
* @since 1.9
|
|
*/
|
|
public StringSubstitutor(final StringSubstitutor other) {
|
|
disableSubstitutionInValues = other.isDisableSubstitutionInValues();
|
|
enableSubstitutionInVariables = other.isEnableSubstitutionInVariables();
|
|
enableUndefinedVariableException = other.isEnableUndefinedVariableException();
|
|
escapeChar = other.getEscapeChar();
|
|
prefixMatcher = other.getVariablePrefixMatcher();
|
|
preserveEscapes = other.isPreserveEscapes();
|
|
suffixMatcher = other.getVariableSuffixMatcher();
|
|
valueDelimiterMatcher = other.getValueDelimiterMatcher();
|
|
variableResolver = other.getStringLookup();
|
|
}
|
|
|
|
/**
|
|
* Checks if the specified variable is already in the stack (list) of variables.
|
|
*
|
|
* @param varName the variable name to check
|
|
* @param priorVariables the list of prior variables
|
|
*/
|
|
private void checkCyclicSubstitution(final String varName, final List<String> priorVariables) {
|
|
if (!priorVariables.contains(varName)) {
|
|
return;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(256);
|
|
buf.append("Infinite loop in property interpolation of ");
|
|
buf.append(priorVariables.remove(0));
|
|
buf.append(": ");
|
|
buf.appendWithSeparators(priorVariables, "->");
|
|
throw new IllegalStateException(buf.toString());
|
|
}
|
|
|
|
// Escape
|
|
/**
|
|
* Returns the escape character.
|
|
*
|
|
* @return The character used for escaping variable references
|
|
*/
|
|
public char getEscapeChar() {
|
|
return this.escapeChar;
|
|
}
|
|
|
|
/**
|
|
* Gets the StringLookup that is used to lookup variables.
|
|
*
|
|
* @return The StringLookup
|
|
*/
|
|
public StringLookup getStringLookup() {
|
|
return this.variableResolver;
|
|
}
|
|
|
|
/**
|
|
* Gets the variable default value delimiter matcher currently in use.
|
|
* <p>
|
|
* The variable default value delimiter is the character or characters that delimit the variable name and the
|
|
* variable default value. This delimiter is expressed in terms of a matcher allowing advanced variable default
|
|
* value delimiter matches.
|
|
* </p>
|
|
* <p>
|
|
* If it returns null, then the variable default value resolution is disabled.
|
|
*
|
|
* @return The variable default value delimiter matcher in use, may be null
|
|
*/
|
|
public StringMatcher getValueDelimiterMatcher() {
|
|
return valueDelimiterMatcher;
|
|
}
|
|
|
|
/**
|
|
* Gets the variable prefix matcher currently in use.
|
|
* <p>
|
|
* The variable prefix is the character or characters that identify the start of a variable. This prefix is
|
|
* expressed in terms of a matcher allowing advanced prefix matches.
|
|
* </p>
|
|
*
|
|
* @return The prefix matcher in use
|
|
*/
|
|
public StringMatcher getVariablePrefixMatcher() {
|
|
return prefixMatcher;
|
|
}
|
|
|
|
/**
|
|
* Gets the variable suffix matcher currently in use.
|
|
* <p>
|
|
* The variable suffix is the character or characters that identify the end of a variable. This suffix is expressed
|
|
* in terms of a matcher allowing advanced suffix matches.
|
|
* </p>
|
|
*
|
|
* @return The suffix matcher in use
|
|
*/
|
|
public StringMatcher getVariableSuffixMatcher() {
|
|
return suffixMatcher;
|
|
}
|
|
|
|
/**
|
|
* Returns a flag whether substitution is disabled in variable values.If set to <b>true</b>, the values of variables
|
|
* can contain other variables will not be processed and substituted original variable is evaluated, e.g.
|
|
*
|
|
* <pre>
|
|
* Map<String, String> valuesMap = new HashMap<>();
|
|
* valuesMap.put("name", "Douglas ${surname}");
|
|
* valuesMap.put("surname", "Crockford");
|
|
* String templateString = "Hi ${name}";
|
|
* StrSubstitutor sub = new StrSubstitutor(valuesMap);
|
|
* String resolvedString = sub.replace(templateString);
|
|
* </pre>
|
|
*
|
|
* yielding:
|
|
*
|
|
* <pre>
|
|
* Hi Douglas ${surname}
|
|
* </pre>
|
|
*
|
|
* @return The substitution in variable values flag
|
|
*/
|
|
public boolean isDisableSubstitutionInValues() {
|
|
return disableSubstitutionInValues;
|
|
}
|
|
|
|
/**
|
|
* Returns a flag whether substitution is done in variable names.
|
|
*
|
|
* @return The substitution in variable names flag
|
|
*/
|
|
public boolean isEnableSubstitutionInVariables() {
|
|
return enableSubstitutionInVariables;
|
|
}
|
|
|
|
/**
|
|
* Returns a flag whether exception can be thrown upon undefined variable.
|
|
*
|
|
* @return The fail on undefined variable flag
|
|
*/
|
|
public boolean isEnableUndefinedVariableException() {
|
|
return enableUndefinedVariableException;
|
|
}
|
|
|
|
/**
|
|
* Returns the flag controlling whether escapes are preserved during substitution.
|
|
*
|
|
* @return The preserve escape flag
|
|
*/
|
|
public boolean isPreserveEscapes() {
|
|
return preserveEscapes;
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* array as a template. The array is not altered by this method.
|
|
*
|
|
* @param source the character array to replace in, not altered, null returns null
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final char[] source) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(source.length).append(source);
|
|
substitute(buf, 0, source.length);
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* array as a template. The array is not altered by this method.
|
|
* <p>
|
|
* Only the specified portion of the array will be processed. The rest of the array is not processed, and is not
|
|
* returned.
|
|
* </p>
|
|
*
|
|
* @param source the character array to replace in, not altered, null returns null
|
|
* @param offset the start offset within the array, must be valid
|
|
* @param length the length within the array to be processed, must be valid
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
* @throws StringIndexOutOfBoundsException if {@code offset} is not in the
|
|
* range {@code 0 <= offset <= chars.length}
|
|
* @throws StringIndexOutOfBoundsException if {@code length < 0}
|
|
* @throws StringIndexOutOfBoundsException if {@code offset + length > chars.length}
|
|
*/
|
|
public String replace(final char[] source, final int offset, final int length) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(length).append(source, offset, length);
|
|
substitute(buf, 0, length);
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source as
|
|
* a template. The source is not altered by this method.
|
|
*
|
|
* @param source the buffer to use as a template, not changed, null returns null
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final CharSequence source) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
return replace(source, 0, source.length());
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source as
|
|
* a template. The source is not altered by this method.
|
|
* <p>
|
|
* Only the specified portion of the buffer will be processed. The rest of the buffer is not processed, and is not
|
|
* returned.
|
|
* </p>
|
|
*
|
|
* @param source the buffer to use as a template, not changed, null returns null
|
|
* @param offset the start offset within the array, must be valid
|
|
* @param length the length within the array to be processed, must be valid
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final CharSequence source, final int offset, final int length) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(length).append(source.toString(), offset, length);
|
|
substitute(buf, 0, length);
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables in the given source object with their matching values from the
|
|
* resolver. The input source object is converted to a string using {@code toString} and is not altered.
|
|
*
|
|
* @param source the source to replace in, null returns null
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if a variable is not found and enableUndefinedVariableException is true
|
|
*/
|
|
public String replace(final Object source) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder().append(source);
|
|
substitute(buf, 0, buf.length());
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* string as a template.
|
|
*
|
|
* @param source the string to replace in, null returns null
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final String source) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(source);
|
|
if (!substitute(buf, 0, source.length())) {
|
|
return source;
|
|
}
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* string as a template.
|
|
* <p>
|
|
* Only the specified portion of the string will be processed. The rest of the string is not processed, and is not
|
|
* returned.
|
|
* </p>
|
|
*
|
|
* @param source the string to replace in, null returns null
|
|
* @param offset the start offset within the source, must be valid
|
|
* @param length the length within the source to be processed, must be valid
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
* @throws StringIndexOutOfBoundsException if {@code offset} is not in the
|
|
* range {@code 0 <= offset <= source.length()}
|
|
* @throws StringIndexOutOfBoundsException if {@code length < 0}
|
|
* @throws StringIndexOutOfBoundsException if {@code offset + length > source.length()}
|
|
*/
|
|
public String replace(final String source,
|
|
final @IndexOrHigh("#1") int offset,
|
|
final @NonNegative @LTLengthOf(value = "#1", offset = "#2 - 1") int length) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(length).append(source, offset, length);
|
|
if (!substitute(buf, 0, length)) {
|
|
return source.substring(offset, offset + length);
|
|
}
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* buffer as a template. The buffer is not altered by this method.
|
|
*
|
|
* @param source the buffer to use as a template, not changed, null returns null
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final StringBuffer source) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(source.length()).append(source);
|
|
substitute(buf, 0, buf.length());
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* buffer as a template. The buffer is not altered by this method.
|
|
* <p>
|
|
* Only the specified portion of the buffer will be processed. The rest of the buffer is not processed, and is not
|
|
* returned.
|
|
* </p>
|
|
*
|
|
* @param source the buffer to use as a template, not changed, null returns null
|
|
* @param offset the start offset within the source, must be valid
|
|
* @param length the length within the source to be processed, must be valid
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final StringBuffer source, final int offset, final int length) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(length).append(source, offset, length);
|
|
substitute(buf, 0, length);
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* builder as a template. The builder is not altered by this method.
|
|
*
|
|
* @param source the builder to use as a template, not changed, null returns null
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final TextStringBuilder source) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder builder = new TextStringBuilder(source.length()).append(source);
|
|
substitute(builder, 0, builder.length());
|
|
return builder.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables with their matching values from the resolver using the given source
|
|
* builder as a template. The builder is not altered by this method.
|
|
* <p>
|
|
* Only the specified portion of the builder will be processed. The rest of the builder is not processed, and is not
|
|
* returned.
|
|
* </p>
|
|
*
|
|
* @param source the builder to use as a template, not changed, null returns null
|
|
* @param offset the start offset within the source, must be valid
|
|
* @param length the length within the source to be processed, must be valid
|
|
* @return The result of the replace operation
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public String replace(final TextStringBuilder source, final int offset, final int length) {
|
|
if (source == null) {
|
|
return null;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(length).append(source, offset, length);
|
|
substitute(buf, 0, length);
|
|
return buf.toString();
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables within the given source buffer with their matching values from the
|
|
* resolver. The buffer is updated with the result.
|
|
*
|
|
* @param source the buffer to replace in, updated, null returns zero
|
|
* @return true if altered
|
|
*/
|
|
public boolean replaceIn(final StringBuffer source) {
|
|
if (source == null) {
|
|
return false;
|
|
}
|
|
return replaceIn(source, 0, source.length());
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables within the given source buffer with their matching values from the
|
|
* resolver. The buffer is updated with the result.
|
|
* <p>
|
|
* Only the specified portion of the buffer will be processed. The rest of the buffer is not processed, but it is
|
|
* not deleted.
|
|
* </p>
|
|
*
|
|
* @param source the buffer to replace in, updated, null returns zero
|
|
* @param offset the start offset within the source, must be valid
|
|
* @param length the length within the source to be processed, must be valid
|
|
* @return true if altered
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public boolean replaceIn(final StringBuffer source, final int offset, final int length) {
|
|
if (source == null) {
|
|
return false;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(length).append(source, offset, length);
|
|
if (!substitute(buf, 0, length)) {
|
|
return false;
|
|
}
|
|
source.replace(offset, offset + length, buf.toString());
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables within the given source buffer with their matching values from the
|
|
* resolver. The buffer is updated with the result.
|
|
*
|
|
* @param source the buffer to replace in, updated, null returns zero
|
|
* @return true if altered
|
|
*/
|
|
public boolean replaceIn(final StringBuilder source) {
|
|
if (source == null) {
|
|
return false;
|
|
}
|
|
return replaceIn(source, 0, source.length());
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables within the given source builder with their matching values from the
|
|
* resolver. The builder is updated with the result.
|
|
* <p>
|
|
* Only the specified portion of the buffer will be processed. The rest of the buffer is not processed, but it is
|
|
* not deleted.
|
|
* </p>
|
|
*
|
|
* @param source the buffer to replace in, updated, null returns zero
|
|
* @param offset the start offset within the source, must be valid
|
|
* @param length the length within the source to be processed, must be valid
|
|
* @return true if altered
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public boolean replaceIn(final StringBuilder source, final int offset, final int length) {
|
|
if (source == null) {
|
|
return false;
|
|
}
|
|
final TextStringBuilder buf = new TextStringBuilder(length).append(source, offset, length);
|
|
if (!substitute(buf, 0, length)) {
|
|
return false;
|
|
}
|
|
source.replace(offset, offset + length, buf.toString());
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables within the given source builder with their matching values from the
|
|
* resolver.
|
|
*
|
|
* @param source the builder to replace in, updated, null returns zero
|
|
* @return true if altered
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public boolean replaceIn(final TextStringBuilder source) {
|
|
if (source == null) {
|
|
return false;
|
|
}
|
|
return substitute(source, 0, source.length());
|
|
}
|
|
|
|
/**
|
|
* Replaces all the occurrences of variables within the given source builder with their matching values from the
|
|
* resolver.
|
|
* <p>
|
|
* Only the specified portion of the builder will be processed. The rest of the builder is not processed, but it is
|
|
* not deleted.
|
|
* </p>
|
|
*
|
|
* @param source the builder to replace in, null returns zero
|
|
* @param offset the start offset within the source, must be valid
|
|
* @param length the length within the source to be processed, must be valid
|
|
* @return true if altered
|
|
* @throws IllegalArgumentException if variable is not found when its allowed to throw exception
|
|
*/
|
|
public boolean replaceIn(final TextStringBuilder source, final int offset, final int length) {
|
|
if (source == null) {
|
|
return false;
|
|
}
|
|
return substitute(source, offset, length);
|
|
}
|
|
|
|
/**
|
|
* Internal method that resolves the value of a variable.
|
|
* <p>
|
|
* Most users of this class do not need to call this method. This method is called automatically by the substitution
|
|
* process.
|
|
* </p>
|
|
* <p>
|
|
* Writers of subclasses can override this method if they need to alter how each substitution occurs. The method is
|
|
* passed the variable's name and must return the corresponding value. This implementation uses the
|
|
* {@link #getStringLookup()} with the variable's name as the key.
|
|
* </p>
|
|
*
|
|
* @param variableName the name of the variable, not null
|
|
* @param buf the buffer where the substitution is occurring, not null
|
|
* @param startPos the start position of the variable including the prefix, valid
|
|
* @param endPos the end position of the variable including the suffix, valid
|
|
* @return The variable's value or <b>null</b> if the variable is unknown
|
|
*/
|
|
protected String resolveVariable(final String variableName, final TextStringBuilder buf, final int startPos,
|
|
final int endPos) {
|
|
final StringLookup resolver = getStringLookup();
|
|
if (resolver == null) {
|
|
return null;
|
|
}
|
|
return resolver.lookup(variableName);
|
|
}
|
|
|
|
/**
|
|
* Sets a flag whether substitution is done in variable values (recursive).
|
|
*
|
|
* @param disableSubstitutionInValues true if substitution in variable value are disabled
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setDisableSubstitutionInValues(final boolean disableSubstitutionInValues) {
|
|
this.disableSubstitutionInValues = disableSubstitutionInValues;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets a flag whether substitution is done in variable names. If set to <b>true</b>, the names of variables can
|
|
* contain other variables which are processed first before the original variable is evaluated, e.g.
|
|
* {@code ${jre-${java.version}}}. The default value is <b>false</b>.
|
|
*
|
|
* @param enableSubstitutionInVariables the new value of the flag
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setEnableSubstitutionInVariables(final boolean enableSubstitutionInVariables) {
|
|
this.enableSubstitutionInVariables = enableSubstitutionInVariables;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets a flag whether exception should be thrown if any variable is undefined.
|
|
*
|
|
* @param failOnUndefinedVariable true if exception should be thrown on undefined variable
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setEnableUndefinedVariableException(final boolean failOnUndefinedVariable) {
|
|
this.enableUndefinedVariableException = failOnUndefinedVariable;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets the escape character. If this character is placed before a variable reference in the source text, this
|
|
* variable will be ignored.
|
|
*
|
|
* @param escapeCharacter the escape character (0 for disabling escaping)
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setEscapeChar(final char escapeCharacter) {
|
|
this.escapeChar = escapeCharacter;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets a flag controlling whether escapes are preserved during substitution. If set to <b>true</b>, the escape
|
|
* character is retained during substitution (e.g. {@code $${this-is-escaped}} remains {@code $${this-is-escaped}}).
|
|
* If set to <b>false</b>, the escape character is removed during substitution (e.g. {@code $${this-is-escaped}}
|
|
* becomes {@code ${this-is-escaped}}). The default value is <b>false</b>
|
|
*
|
|
* @param preserveEscapes true if escapes are to be preserved
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setPreserveEscapes(final boolean preserveEscapes) {
|
|
this.preserveEscapes = preserveEscapes;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets the variable default value delimiter to use.
|
|
* <p>
|
|
* The variable default value delimiter is the character or characters that delimit the variable name and the
|
|
* variable default value. This method allows a single character variable default value delimiter to be easily set.
|
|
* </p>
|
|
*
|
|
* @param valueDelimiter the variable default value delimiter character to use
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setValueDelimiter(final char valueDelimiter) {
|
|
return setValueDelimiterMatcher(StringMatcherFactory.INSTANCE.charMatcher(valueDelimiter));
|
|
}
|
|
|
|
/**
|
|
* Sets the variable default value delimiter to use.
|
|
* <p>
|
|
* The variable default value delimiter is the character or characters that delimit the variable name and the
|
|
* variable default value. This method allows a string variable default value delimiter to be easily set.
|
|
* </p>
|
|
* <p>
|
|
* If the {@code valueDelimiter} is null or empty string, then the variable default value resolution becomes
|
|
* disabled.
|
|
* </p>
|
|
*
|
|
* @param valueDelimiter the variable default value delimiter string to use, may be null or empty
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setValueDelimiter(final String valueDelimiter) {
|
|
if (valueDelimiter == null || valueDelimiter.isEmpty()) {
|
|
setValueDelimiterMatcher(null);
|
|
return this;
|
|
}
|
|
return setValueDelimiterMatcher(StringMatcherFactory.INSTANCE.stringMatcher(valueDelimiter));
|
|
}
|
|
|
|
/**
|
|
* Sets the variable default value delimiter matcher to use.
|
|
* <p>
|
|
* The variable default value delimiter is the character or characters that delimit the variable name and the
|
|
* variable default value. This delimiter is expressed in terms of a matcher allowing advanced variable default
|
|
* value delimiter matches.
|
|
* </p>
|
|
* <p>
|
|
* If the {@code valueDelimiterMatcher} is null, then the variable default value resolution becomes disabled.
|
|
* </p>
|
|
*
|
|
* @param valueDelimiterMatcher variable default value delimiter matcher to use, may be null
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setValueDelimiterMatcher(final StringMatcher valueDelimiterMatcher) {
|
|
this.valueDelimiterMatcher = valueDelimiterMatcher;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets the variable prefix to use.
|
|
* <p>
|
|
* The variable prefix is the character or characters that identify the start of a variable. This method allows a
|
|
* single character prefix to be easily set.
|
|
* </p>
|
|
*
|
|
* @param prefix the prefix character to use
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setVariablePrefix(final char prefix) {
|
|
return setVariablePrefixMatcher(StringMatcherFactory.INSTANCE.charMatcher(prefix));
|
|
}
|
|
|
|
/**
|
|
* Sets the variable prefix to use.
|
|
* <p>
|
|
* The variable prefix is the character or characters that identify the start of a variable. This method allows a
|
|
* string prefix to be easily set.
|
|
* </p>
|
|
*
|
|
* @param prefix the prefix for variables, not null
|
|
* @return this, to enable chaining
|
|
* @throws IllegalArgumentException if the prefix is null
|
|
*/
|
|
public StringSubstitutor setVariablePrefix(final String prefix) {
|
|
Validate.isTrue(prefix != null, "Variable prefix must not be null!");
|
|
return setVariablePrefixMatcher(StringMatcherFactory.INSTANCE.stringMatcher(prefix));
|
|
}
|
|
|
|
/**
|
|
* Sets the variable prefix matcher currently in use.
|
|
* <p>
|
|
* The variable prefix is the character or characters that identify the start of a variable. This prefix is
|
|
* expressed in terms of a matcher allowing advanced prefix matches.
|
|
* </p>
|
|
*
|
|
* @param prefixMatcher the prefix matcher to use, null ignored
|
|
* @return this, to enable chaining
|
|
* @throws IllegalArgumentException if the prefix matcher is null
|
|
*/
|
|
public StringSubstitutor setVariablePrefixMatcher(final StringMatcher prefixMatcher) {
|
|
Validate.isTrue(prefixMatcher != null, "Variable prefix matcher must not be null!");
|
|
this.prefixMatcher = prefixMatcher;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets the VariableResolver that is used to lookup variables.
|
|
*
|
|
* @param variableResolver the VariableResolver
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setVariableResolver(final StringLookup variableResolver) {
|
|
this.variableResolver = variableResolver;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Sets the variable suffix to use.
|
|
* <p>
|
|
* The variable suffix is the character or characters that identify the end of a variable. This method allows a
|
|
* single character suffix to be easily set.
|
|
* </p>
|
|
*
|
|
* @param suffix the suffix character to use
|
|
* @return this, to enable chaining
|
|
*/
|
|
public StringSubstitutor setVariableSuffix(final char suffix) {
|
|
return setVariableSuffixMatcher(StringMatcherFactory.INSTANCE.charMatcher(suffix));
|
|
}
|
|
|
|
/**
|
|
* Sets the variable suffix to use.
|
|
* <p>
|
|
* The variable suffix is the character or characters that identify the end of a variable. This method allows a
|
|
* string suffix to be easily set.
|
|
* </p>
|
|
*
|
|
* @param suffix the suffix for variables, not null
|
|
* @return this, to enable chaining
|
|
* @throws IllegalArgumentException if the suffix is null
|
|
*/
|
|
public StringSubstitutor setVariableSuffix(final String suffix) {
|
|
Validate.isTrue(suffix != null, "Variable suffix must not be null!");
|
|
return setVariableSuffixMatcher(StringMatcherFactory.INSTANCE.stringMatcher(suffix));
|
|
}
|
|
|
|
/**
|
|
* Sets the variable suffix matcher currently in use.
|
|
* <p>
|
|
* The variable suffix is the character or characters that identify the end of a variable. This suffix is expressed
|
|
* in terms of a matcher allowing advanced suffix matches.
|
|
* </p>
|
|
*
|
|
* @param suffixMatcher the suffix matcher to use, null ignored
|
|
* @return this, to enable chaining
|
|
* @throws IllegalArgumentException if the suffix matcher is null
|
|
*/
|
|
public StringSubstitutor setVariableSuffixMatcher(final StringMatcher suffixMatcher) {
|
|
Validate.isTrue(suffixMatcher != null, "Variable suffix matcher must not be null!");
|
|
this.suffixMatcher = suffixMatcher;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Internal method that substitutes the variables.
|
|
* <p>
|
|
* Most users of this class do not need to call this method. This method will be called automatically by another
|
|
* (public) method.
|
|
* </p>
|
|
* <p>
|
|
* Writers of subclasses can override this method if they need access to the substitution process at the start or
|
|
* end.
|
|
* </p>
|
|
*
|
|
* @param builder the string builder to substitute into, not null
|
|
* @param offset the start offset within the builder, must be valid
|
|
* @param length the length within the builder to be processed, must be valid
|
|
* @return true if altered
|
|
*/
|
|
protected boolean substitute(final TextStringBuilder builder, final int offset, final int length) {
|
|
return substitute(builder, offset, length, null).altered;
|
|
}
|
|
|
|
/**
|
|
* Recursive handler for multiple levels of interpolation. This is the main interpolation method, which resolves the
|
|
* values of all variable references contained in the passed in text.
|
|
*
|
|
* @param builder the string builder to substitute into, not null
|
|
* @param offset the start offset within the builder, must be valid
|
|
* @param length the length within the builder to be processed, must be valid
|
|
* @param priorVariables the stack keeping track of the replaced variables, may be null
|
|
* @return The result.
|
|
* @throws IllegalArgumentException if variable is not found and <pre>isEnableUndefinedVariableException()==true</pre>
|
|
* @since 1.9
|
|
*/
|
|
private Result substitute(final TextStringBuilder builder, final int offset, final int length,
|
|
List<String> priorVariables) {
|
|
Objects.requireNonNull(builder, "builder");
|
|
final StringMatcher prefixMatcher = getVariablePrefixMatcher();
|
|
final StringMatcher suffixMatcher = getVariableSuffixMatcher();
|
|
final char escapeCh = getEscapeChar();
|
|
final StringMatcher valueDelimMatcher = getValueDelimiterMatcher();
|
|
final boolean substitutionInVariablesEnabled = isEnableSubstitutionInVariables();
|
|
final boolean substitutionInValuesDisabled = isDisableSubstitutionInValues();
|
|
final boolean undefinedVariableException = isEnableUndefinedVariableException();
|
|
final boolean preserveEscapes = isPreserveEscapes();
|
|
|
|
boolean altered = false;
|
|
int lengthChange = 0;
|
|
int bufEnd = offset + length;
|
|
int pos = offset;
|
|
int escPos = -1;
|
|
outer: while (pos < bufEnd) {
|
|
final int startMatchLen = prefixMatcher.isMatch(builder, pos, offset, bufEnd);
|
|
if (startMatchLen == 0) {
|
|
pos++;
|
|
} else {
|
|
// found variable start marker
|
|
if (pos > offset && builder.charAt(pos - 1) == escapeCh) {
|
|
// escape detected
|
|
if (preserveEscapes) {
|
|
// keep escape
|
|
pos++;
|
|
continue;
|
|
}
|
|
// mark esc ch for deletion if we find a complete variable
|
|
escPos = pos - 1;
|
|
}
|
|
// find suffix
|
|
int startPos = pos;
|
|
pos += startMatchLen;
|
|
int endMatchLen = 0;
|
|
int nestedVarCount = 0;
|
|
while (pos < bufEnd) {
|
|
if (substitutionInVariablesEnabled && prefixMatcher.isMatch(builder, pos, offset, bufEnd) != 0) {
|
|
// found a nested variable start
|
|
endMatchLen = prefixMatcher.isMatch(builder, pos, offset, bufEnd);
|
|
nestedVarCount++;
|
|
pos += endMatchLen;
|
|
continue;
|
|
}
|
|
|
|
endMatchLen = suffixMatcher.isMatch(builder, pos, offset, bufEnd);
|
|
if (endMatchLen == 0) {
|
|
pos++;
|
|
} else {
|
|
// found variable end marker
|
|
if (nestedVarCount == 0) {
|
|
if (escPos >= 0) {
|
|
// delete escape
|
|
builder.deleteCharAt(escPos);
|
|
escPos = -1;
|
|
lengthChange--;
|
|
altered = true;
|
|
bufEnd--;
|
|
pos = startPos + 1;
|
|
startPos--;
|
|
continue outer;
|
|
}
|
|
// get var name
|
|
String varNameExpr = builder.midString(startPos + startMatchLen,
|
|
pos - startPos - startMatchLen);
|
|
if (substitutionInVariablesEnabled) {
|
|
final TextStringBuilder bufName = new TextStringBuilder(varNameExpr);
|
|
substitute(bufName, 0, bufName.length());
|
|
varNameExpr = bufName.toString();
|
|
}
|
|
pos += endMatchLen;
|
|
final int endPos = pos;
|
|
|
|
String varName = varNameExpr;
|
|
String varDefaultValue = null;
|
|
|
|
if (valueDelimMatcher != null) {
|
|
final char[] varNameExprChars = varNameExpr.toCharArray();
|
|
int valueDelimiterMatchLen = 0;
|
|
for (int i = 0; i < varNameExprChars.length; i++) {
|
|
// if there's any nested variable when nested variable substitution disabled,
|
|
// then stop resolving name and default value.
|
|
if (!substitutionInVariablesEnabled && prefixMatcher.isMatch(varNameExprChars, i, i,
|
|
varNameExprChars.length) != 0) {
|
|
break;
|
|
}
|
|
if (valueDelimMatcher.isMatch(varNameExprChars, i, 0,
|
|
varNameExprChars.length) != 0) {
|
|
valueDelimiterMatchLen = valueDelimMatcher.isMatch(varNameExprChars, i, 0,
|
|
varNameExprChars.length);
|
|
varName = varNameExpr.substring(0, i);
|
|
varDefaultValue = varNameExpr.substring(i + valueDelimiterMatchLen);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// on the first call initialize priorVariables
|
|
if (priorVariables == null) {
|
|
priorVariables = new ArrayList<>();
|
|
priorVariables.add(builder.midString(offset, length));
|
|
}
|
|
|
|
// handle cyclic substitution
|
|
checkCyclicSubstitution(varName, priorVariables);
|
|
priorVariables.add(varName);
|
|
|
|
// resolve the variable
|
|
String varValue = resolveVariable(varName, builder, startPos, endPos);
|
|
if (varValue == null) {
|
|
varValue = varDefaultValue;
|
|
}
|
|
if (varValue != null) {
|
|
final int varLen = varValue.length();
|
|
builder.replace(startPos, endPos, varValue);
|
|
altered = true;
|
|
int change = 0;
|
|
if (!substitutionInValuesDisabled) { // recursive replace
|
|
change = substitute(builder, startPos, varLen, priorVariables).lengthChange;
|
|
}
|
|
change = change + varLen - (endPos - startPos);
|
|
pos += change;
|
|
bufEnd += change;
|
|
lengthChange += change;
|
|
} else if (undefinedVariableException) {
|
|
throw new IllegalArgumentException(
|
|
String.format("Cannot resolve variable '%s' (enableSubstitutionInVariables=%s).",
|
|
varName, substitutionInVariablesEnabled));
|
|
}
|
|
|
|
// remove variable from the cyclic stack
|
|
priorVariables.remove(priorVariables.size() - 1);
|
|
break;
|
|
}
|
|
nestedVarCount--;
|
|
pos += endMatchLen;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return new Result(altered, lengthChange);
|
|
}
|
|
}
|