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