80 lines
2.6 KiB
Java
80 lines
2.6 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.lang3.text.translate;
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import java.io.IOException;
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import java.io.Writer;
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/**
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* Executes a sequence of translators one after the other. Execution ends
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* whenever the first translator consumes codepoints from the input.
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*
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* @since 3.0
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* @version $Id: AggregateTranslator.java 1088899 2011-04-05 05:31:27Z bayard $
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*/
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public class AggregateTranslator extends CharSequenceTranslator {
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private final CharSequenceTranslator[] translators;
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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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this.translators = clone(translators);
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}
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/**
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* The first translator to consume codepoints from the input is the
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* 'winner'. Execution stops with the number of consumed codepoints being
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* returned. {@inheritDoc}
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*/
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@Override
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public int translate(final CharSequence input, final int index, final Writer out) throws IOException {
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for (final CharSequenceTranslator translator : translators) {
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final int consumed = translator.translate(input, index, out);
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if (consumed != 0) return consumed;
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}
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return 0;
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}
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/**
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* <p>
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* Shallow clones an array returning a typecast result and handling
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* {@code null}.
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* </p>
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* <p>
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* The objects in the array are not cloned, thus there is no special
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* handling for multi-dimensional arrays.
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* </p>
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* <p>
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* This method returns {@code null} for a {@code null} input array.
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* </p>
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*
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* @param <T> the component type of the array
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* @param array the array to shallow clone, may be {@code null}
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* @return the cloned array, {@code null} if {@code null} input
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*/
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private static <T> T[] clone(final T[] array) {
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if (array == null) return null;
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return array.clone();
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}
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}
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