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1   package net.sourceforge.pmd.util;
2   
3   import java.io.File;
4   import java.io.FilenameFilter;
5   import java.util.ArrayList;
6   import java.util.List;
7   
8   /**
9    * A utility class for finding files within a directory.
10   */
11  public class FileFinder {
12  
13      private FilenameFilter filter;
14      private static final String FILE_SEP = System.getProperty("file.separator");
15  
16      public List<File> findFilesFrom(String dir, FilenameFilter filter, boolean recurse) {
17          this.filter = filter;
18          List<File> files = new ArrayList<File>();
19          scanDirectory(new File(dir), files, recurse);
20          return files;
21      }
22  
23      /**
24       * Implements a tail recursive file scanner
25       */
26      private void scanDirectory(File dir, List<File> list, boolean recurse) {
27          String[] candidates = dir.list(filter);
28          if (candidates == null) {
29              return;
30          }
31          for (int i = 0; i < candidates.length; i++) {
32              File tmp = new File(dir + FILE_SEP + candidates[i]);
33              if (tmp.isDirectory()) {
34                  if (recurse) {
35                      scanDirectory(tmp, list, true);
36                  }
37              } else {
38                  list.add(new File(dir + FILE_SEP + candidates[i]));
39              }
40          }
41      }
42  }