Java File List Load getFileListing(File aStartingDir)

Description

get File Listing

License

Open Source License

Declaration

static public List<File> getFileListing(File aStartingDir) throws FileNotFoundException 

Method Source Code

//package com.java2s;
/**/*from   w  w  w.j a  va 2s .  c o m*/
 * Copyright (C) 2008 by
 * 
 *    Cam-Tu Nguyen
 *  ncamtu@gmail.com
 *  College of Technology
 *  Vietnam National University, Hanoi
 *  
 *  Thu-Trang Nguyen
 *  trangnt84@gmail.com
 *  College of Technology
 *  Vietnam National University, Hanoi
 *
 * JNSP is a free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * JNSP is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JNSP; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */

import java.io.File;
import java.io.FileNotFoundException;

import java.util.ArrayList;
import java.util.Arrays;

import java.util.List;

public class Main {
    static public List<File> getFileListing(File aStartingDir) throws FileNotFoundException {
        validateDirectory(aStartingDir);
        List<File> result = new ArrayList<File>();

        File[] filesAndDirs = aStartingDir.listFiles();
        List<File> filesDirs = Arrays.asList(filesAndDirs);
        for (File file : filesDirs) {
            if (!file.isFile()) {
                //must be a directory
                //recursive call!
                List<File> deeperList = getFileListing(file);
                result.addAll(deeperList);
            } else {
                if (file.getName().endsWith(".txt"))
                    result.add(file); //add file *.txt only
            }
        }

        return result;
    }

    static private void validateDirectory(File aDirectory) throws FileNotFoundException {
        if (aDirectory == null) {
            throw new IllegalArgumentException("Directory should not be null.");
        }
        if (!aDirectory.exists()) {
            throw new FileNotFoundException("Directory does not exist: " + aDirectory);
        }
        if (!aDirectory.isDirectory()) {
            throw new IllegalArgumentException("Is not a directory: " + aDirectory);
        }
        if (!aDirectory.canRead()) {
            throw new IllegalArgumentException("Directory cannot be read: " + aDirectory);
        }
    }
}

Related

1. getFileListByExtension(final String location, final String extension)
2. getFileListByRegex(String dir, final String regex)
3. getFileListDeep(File path)
4. getFileListInFolder(String path)
5. getFileListInFolderForImages(String imageFolder)
6. getFileListing(File dir)
7. getFileListing(File directory)
8. getFileListing(File file)
9. getFileListing(File file, String... extension)