01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: *
17: */
18:
19: package org.apache.tools.ant.util;
20:
21: import java.util.List;
22: import java.util.Arrays;
23: import java.util.Iterator;
24: import java.util.ArrayList;
25:
26: /**
27: * A <CODE>ContainerMapper</CODE> that chains the results of the first
28: * nested <CODE>FileNameMapper</CODE>s into sourcefiles for the second,
29: * the second to the third, and so on, returning the resulting mapped
30: * filenames from the last nested <CODE>FileNameMapper</CODE>.
31: */
32: public class ChainedMapper extends ContainerMapper {
33:
34: /** {@inheritDoc}. */
35: public String[] mapFileName(String sourceFileName) {
36: List inputs = new ArrayList();
37: List results = new ArrayList();
38: results.add(sourceFileName);
39: FileNameMapper mapper = null;
40:
41: for (Iterator mIter = getMappers().iterator(); mIter.hasNext();) {
42: mapper = (FileNameMapper) (mIter.next());
43: if (mapper != null) {
44: inputs.clear();
45: inputs.addAll(results);
46: results.clear();
47:
48: for (Iterator it = inputs.iterator(); it.hasNext();) {
49: String[] mapped = mapper.mapFileName((String) (it
50: .next()));
51: if (mapped != null) {
52: results.addAll(Arrays.asList(mapped));
53: }
54: }
55: }
56: }
57: return (results.size() == 0) ? null : (String[]) results
58: .toArray(new String[results.size()]);
59: }
60: }
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