Java tutorial
/*********** LICENSE HEADER ******************************* JAUS Tool Set Copyright (c) 2010, United States Government All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the United States Government nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ********************* END OF LICENSE ***********************************/ package org.jts.docGenerator.util; import java.io.File; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.List; import org.apache.commons.io.FileUtils; import org.apache.commons.io.filefilter.DirectoryFileFilter; import org.apache.commons.io.filefilter.FileFilterUtils; import org.apache.commons.io.filefilter.IOFileFilter; import org.apache.commons.io.filefilter.TrueFileFilter; /** Recursively scans a directory and lists files that meets the specified * filter's requirements. * * @author Arfath Pasha $Date: 2005/06/13 16:38:56 $ $Revision: 1.1.1.1 $ * */ public class DirectoryScanner { private ArrayList<File> fileList = null; private ArrayList<File> dirList = null; private FileFilter filter = null; /** Creates an instance of a Directory Scanner for the specified directory. * * @param dir directory to scan * @param filter filter to use. null if no specified filter * */ public DirectoryScanner(File dir, FileFilter filter) { this.filter = filter; fileList = new ArrayList<File>(); dirList = new ArrayList<File>(); scan(dir); } /** returns a list of files that meet the specified filter's requirements. * an empty list is returned if no files were found to meet the filter's * requirements. * */ public List<File> getFileList() { return fileList; } public List<File> getDirList() { return dirList; } /** Starts scanning the specified directory. * */ private void scan(File dir) { if (dir == null) { return; } if (dir.isDirectory() && !dirList.contains(dir)) { dirList.add(dir); } File[] files = dir.listFiles(); if (files == null) { return; } for (int ii = 0; ii < files.length; ii++) { if (files[ii].isDirectory()) { if (!dirList.contains(files[ii])) { dirList.add(files[ii]); } scan(files[ii]); // recursion continue; } if (filter != null) { if (filter.accept(files[ii])) { fileList.add(files[ii]); } } else { fileList.add(files[ii]); } } } private static void compareAndPrint(List<File> list1, List<File> list2) { if (list1.size() != list2.size()) { System.out.println(" Results pairs had different sizes!" + list1.size() + " vs " + list2.size()); System.out.println("list 1 contents: "); for (File file : list1) { System.out.println(file.getName()); } System.out.println("List 2 contents: "); for (File file : list2) { System.out.println(file.getName()); } } else { for (int i = 0; i < list1.size(); ++i) { File file1 = list1.get(i); File file2 = list2.get(i); if (!file1.equals(file2)) { System.out.println("Unequal files: " + file1.getName() + ", " + file2.getName()); } System.out.println("Equal files: " + file1.getName() + ", " + file2.getName()); } } } public static void main(String[] args) { File sourceDir = new File("C:/Users/idurkan/Documents/NetBeansProjects/JAUSToolset/output/framed_html"); // filter all xml files FileFilter serviceSetFilter = new FileFilter() { /** * Accepts Files Ending in .xml extension. * @param name File Name. * @return Accept or Reject Flag */ public boolean accept(File file) { if (file.getName().endsWith(".xml") && !file.isDirectory()) { return true; } else { return false; } } }; // file suffix scanners. DirectoryScanner scanner = new DirectoryScanner(sourceDir, serviceSetFilter); List<File> result1list = scanner.getFileList(); IOFileFilter xmlFilter = FileFilterUtils.suffixFileFilter(".xml"); Collection<File> result2 = FileUtils.listFiles(sourceDir, xmlFilter, TrueFileFilter.INSTANCE); ArrayList<File> result2list = new ArrayList<File>(result2); // directory scanners DirectoryScanner dirscanner = new DirectoryScanner(sourceDir, null); List<File> result3list = scanner.getDirList(); Collection<File> result4 = FileUtils.listFiles(sourceDir, DirectoryFileFilter.DIRECTORY, TrueFileFilter.INSTANCE); ArrayList<File> result4list = new ArrayList<File>(result4); Collections.sort(result1list); Collections.sort(result2list); Collections.sort(result3list); Collections.sort(result4list); compareAndPrint(result1list, result2list); compareAndPrint(result3list, result4list); } }