73 lines
2.5 KiB
Java
73 lines
2.5 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.translate;
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import org.checkerframework.checker.index.qual.LTLengthOf;
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import org.checkerframework.checker.index.qual.NonNegative;
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import org.checkerframework.common.value.qual.MinLen;
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import java.io.IOException;
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import java.io.Writer;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Objects;
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import java.util.stream.Stream;
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/**
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* Executes a sequence of translators one after the other. Execution ends whenever
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* the first translator consumes code points from the input.
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*
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* @since 1.0
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*/
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public class AggregateTranslator extends CharSequenceTranslator {
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/**
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* Translator list.
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*/
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private final List<CharSequenceTranslator> translators = new ArrayList<>();
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/**
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* Specify the translators to be used at creation time.
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*
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* @param translators CharSequenceTranslator array to aggregate
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*/
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public AggregateTranslator(final CharSequenceTranslator... translators) {
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if (translators != null) {
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Stream.of(translators).filter(Objects::nonNull).forEach(this.translators::add);
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}
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}
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/**
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* The first translator to consume code points from the input is the 'winner'.
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* Execution stops with the number of consumed code points being returned.
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* {@inheritDoc}
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*/
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@Override
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public int translate(final CharSequence input,
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final @NonNegative @LTLengthOf("#1") int index,
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final Writer writer) throws IOException {
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for (final CharSequenceTranslator translator : translators) {
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final int consumed = translator.translate(input, index, writer);
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if (consumed != 0) {
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return consumed;
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}
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}
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return 0;
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}
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}
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