1 | /*
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2 | * Copyright 2004 The Apache Software Foundation.
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 |
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18 | package org.apache.tools.ant.util;
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19 |
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20 | import java.util.List;
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21 | import java.util.Arrays;
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22 | import java.util.Iterator;
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23 | import java.util.ArrayList;
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24 | import org.apache.tools.ant.types.Mapper;
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25 |
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26 | /**
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27 | * A <CODE>ContainerMapper</CODE> that chains the results of the first
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28 | * nested <CODE>FileNameMapper</CODE>s into sourcefiles for the second,
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29 | * the second to the third, and so on, returning the resulting mapped
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30 | * filenames from the last nested <CODE>FileNameMapper</CODE>.
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31 | */
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32 | public class ChainedMapper extends ContainerMapper {
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33 |
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34 | //inherit doc
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35 | public String[] mapFileName(String sourceFileName) {
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36 | List inputs = new ArrayList();
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37 | List results = new ArrayList();
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38 | results.add(sourceFileName);
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39 | FileNameMapper mapper = null;
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40 |
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41 | for (Iterator mIter = getMappers().iterator(); mIter.hasNext();) {
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42 | mapper = (FileNameMapper)(mIter.next());
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43 | if (mapper != null) {
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44 | inputs.clear();
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45 | inputs.addAll(results);
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46 | results.clear();
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47 |
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48 | for (Iterator it = inputs.iterator(); it.hasNext();) {
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49 | String[] mapped = mapper.mapFileName((String)(it.next()));
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50 | if (mapped != null) {
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51 | results.addAll(Arrays.asList(mapped));
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52 | }
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53 | }
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54 | }
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55 | }
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56 | return (results.size() == 0) ? null
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57 | : (String[]) results.toArray(new String[results.size()]);
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58 | }
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59 | }
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60 |
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