94 lines
3.0 KiB
Java
94 lines
3.0 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.lookup;
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import java.io.BufferedInputStream;
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import java.io.InputStreamReader;
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import java.io.StringWriter;
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import java.net.URL;
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import org.apache.commons.lang3.StringUtils;
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/**
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* Looks up keys from an XML document.
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* <p>
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* Looks up the value for a given key in the format "Charset:URL".
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* </p>
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* <p>
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* For example: "UTF-8:com/domain/document.properties".
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* </p>
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*
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* @since 1.5
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*/
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final class UrlStringLookup extends AbstractStringLookup {
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/**
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* Defines the singleton for this class.
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*/
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static final UrlStringLookup INSTANCE = new UrlStringLookup();
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/**
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* No need to build instances for now.
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*/
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private UrlStringLookup() {
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// empty
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}
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/**
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* Looks up the value for the key in the format "DocumentPath:XPath".
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* <p>
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* For example: "com/domain/document.xml:/path/to/node".
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* </p>
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*
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* @param key the key to be looked up, may be null
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* @return The value associated with the key.
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*/
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@Override
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public String lookup(final String key) {
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if (key == null) {
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return null;
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}
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final String[] keys = key.split(SPLIT_STR);
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final int keyLen = keys.length;
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if (keyLen < 2) {
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throw IllegalArgumentExceptions.format("Bad URL key format [%s]; expected format is DocumentPath:Key.",
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key);
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}
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final String charsetName = keys[0];
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final String urlStr = StringUtils.substringAfter(key, SPLIT_CH);
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try {
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final URL url = new URL(urlStr);
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final int size = 8192;
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final StringWriter writer = new StringWriter(size);
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final char[] buffer = new char[size];
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try (BufferedInputStream bis = new BufferedInputStream(url.openStream());
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InputStreamReader reader = new InputStreamReader(bis, charsetName)) {
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int n;
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while (-1 != (n = reader.read(buffer))) {
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writer.write(buffer, 0, n);
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}
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}
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return writer.toString();
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} catch (final Exception e) {
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throw IllegalArgumentExceptions.format(e, "Error looking up URL [%s] with Charset [%s].", urlStr,
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charsetName);
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}
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}
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}
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