001 /* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2008-2012 SonarSource 004 * mailto:contact AT sonarsource DOT com 005 * 006 * Sonar is free software; you can redistribute it and/or 007 * modify it under the terms of the GNU Lesser General Public 008 * License as published by the Free Software Foundation; either 009 * version 3 of the License, or (at your option) any later version. 010 * 011 * Sonar is distributed in the hope that it will be useful, 012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 * Lesser General Public License for more details. 015 * 016 * You should have received a copy of the GNU Lesser General Public 017 * License along with Sonar; if not, write to the Free Software 018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02 019 */ 020 021 package net.sourceforge.pmd.util; 022 023 import java.io.File; 024 import java.io.FilenameFilter; 025 import java.util.ArrayList; 026 import java.util.List; 027 028 /** 029 * A utility class for finding files within a directory. 030 */ 031 public class FileFinder { 032 033 private FilenameFilter filter; 034 private static final String FILE_SEP = System.getProperty("file.separator"); 035 036 public List<File> findFilesFrom(String dir, FilenameFilter filter, boolean recurse) { 037 this.filter = filter; 038 List<File> files = new ArrayList<File>(); 039 scanDirectory(new File(dir), files, recurse); 040 return files; 041 } 042 043 /** 044 * Implements a tail recursive file scanner 045 */ 046 private void scanDirectory(File dir, List<File> list, boolean recurse) { 047 String[] candidates = dir.list(filter); 048 if (candidates == null) { 049 return; 050 } 051 for (int i = 0; i < candidates.length; i++) { 052 File tmp = new File(dir + FILE_SEP + candidates[i]); 053 if (tmp.isDirectory()) { 054 if (recurse) { 055 scanDirectory(tmp, list, true); 056 } 057 } else { 058 list.add(new File(dir + FILE_SEP + candidates[i])); 059 } 060 } 061 } 062 }