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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
/**
* A <code>ContainerMapper</code> that chains the results of the first
* nested <code>FileNameMapper</code>s into sourcefiles for the second,
* the second to the third, and so on, returning the resulting mapped
* filenames from the last nested <code>FileNameMapper</code>.
*/
public class ChainedMapper extends ContainerMapper {
/** {@inheritDoc}. */
public String[] mapFileName(String sourceFileName) {
List inputs = new ArrayList();
List results = new ArrayList();
results.add(sourceFileName);
FileNameMapper mapper = null;
for (Iterator mIter = getMappers().iterator(); mIter.hasNext();) {
mapper = (FileNameMapper) (mIter.next());
if (mapper != null) {
inputs.clear();
inputs.addAll(results);
results.clear();
for (Iterator it = inputs.iterator(); it.hasNext();) {
String[] mapped = mapper.mapFileName((String) (it.next()));
if (mapped != null) {
results.addAll(Arrays.asList(mapped));
}
}
}
}
return (results.size() == 0) ? null
: (String[]) results.toArray(new String[results.size()]);
}
}
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