Java File Path Delete deleteDir(File dir)

Description

Deletes all files and sub directories under a directory.

License

Open Source License

Parameter

Parameter	Description
dir	the directory to delete.

Return

true if the directory was deleted, else false.

Declaration

private static boolean deleteDir(File dir)

Method Source Code

//package com.java2s;
/**//from   w ww .  j a  v a 2s. c  o  m
 *
 * This file is part of Stuffed.
 *
 * Stuffed is 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 3 of the License, or
 * (at your option) any later version.
 *
 * Stuffed 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 Stuffed.  If not, see <http://www.gnu.org/licenses/>.
 *
 * File name:    Common.java
 * Package: cs.man.ac.uk.common
 * Created:   May 1, 2013
 * Author:   Rob Lyon
 * 
 * Contact:   rob@scienceguyrob.com or robert.lyon@postgrad.manchester.ac.uk
 * Web:      <http://www.scienceguyrob.com> or <http://www.cs.manchester.ac.uk> 
 *          or <http://www.jb.man.ac.uk>
 */

import java.io.File;

import java.io.IOException;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    /**
     * Deletes all files and sub directories under a directory.
     * Returns true if all deletions were successful. This method is
     * only called within the dirDelete(String path) method, and
     * should only be called from there.
     * 
     * If a deletion fails, the method stops attempting to delete and returns false.
     * @param dir the directory to delete.
     * @return true if the directory was deleted, else false.
     */
    private static boolean deleteDir(File dir) {
        if (dir.isDirectory()) {
            String[] children = dir.list();

            for (int i = 0; i < children.length; i++) {
                boolean success = deleteDir(new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }

        // The directory is now empty so delete it
        return dir.delete();
    }

    /**
     * Checks that the object at the specified path is a directory.
     * @param path the path to check.
     * @return true if the object is a directory.
     */
    public static boolean isDirectory(String path) {
        if (isPathValid(path)) {
            File dir = new File(path);
            if (dir.isDirectory()) {
                return true;
            } else {
                return false;
            }
        } else
            return false;
    }

    /**
     * Checks that the object at the specified path is a directory.
     * @param dir the directory to check.
     * @return true if the object is a directory.
     */
    public static boolean isDirectory(File dir) {
        if (dir.isDirectory()) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Tests whether a path is valid.
     * @param path the path to check.
     * @return true if the file name is valid, else false.
     */
    public static boolean isPathValid(String path) {
        File f;

        if (path != null)
            f = new File(path);
        else
            return false;
        try {
            @SuppressWarnings("unused")
            String canonicalPath = f.getCanonicalPath();

            // Check for invalid characters
            if (isWindows()) {
                return isValidWinPath(path);
            } else if (isMac()) {
                return isValidUnixPath(path);
            } else if (isUnix()) {
                return isValidUnixPath(path);
            } else
                return true;

        } catch (IOException e) {
            return false;
        }
    }

    /**
     * Tests to see if the application is running on windows.
     * @return true if the application is running under windows, else false.
     */
    public static boolean isWindows() {
        String os = System.getProperty("os.name").toLowerCase();
        //windows
        return (os.indexOf("win") >= 0);
    }

    /**
     * Tests to see if a path is valid for the Windows OS.
     * @param path the path to test.
     * @return true if a valid windows path, else false.
     */
    public static boolean isValidWinPath(String path) {
        // If user inputs only a drive letter.
        if (path.length() == 3) {
            return false;
        } else if (path.endsWith("\\")) {
            return false;
        } else {
            String regex = "([a-z]:\\\\(?:[-\\w\\.\\d]+\\\\)*(?:[-\\w\\.\\d]+)?)";

            Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
            Matcher m = p.matcher(path);

            // Invalid path characters to explicitly check for.
            String[] invalidChars = { "\"", "/", "*", "?", "<", ">", "|" };

            for (int i = 0; i < invalidChars.length; i++) {
                if (path.contains(invalidChars[i]))
                    return false;
            }

            // Check the only colon appears at start of path, i.e. C:\
            if (path.indexOf(":") > 1)
                return false;

            return (m.find());
        }
    }

    /**
     * Tests to see if the application is running on MacIntosh.
     * @return true if the application is running under MacIntosh, else false.
     */
    public static boolean isMac() {
        String os = System.getProperty("os.name").toLowerCase();
        return (os.indexOf("mac") >= 0);
    }

    /**
     * UNTESTED.
     * Tests to see if a path is valid for the Unix/Linux OS.
     * @param path the path to test.
     * @return true if a valid unix path, else false.
     */
    public static boolean isValidUnixPath(String path) {
        String regex = "((?:\\/[\\w\\.\\-]+)+)";

        Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
        Matcher m = p.matcher(path);
        return m.find();
    }

    /**
     * Tests to see if the application is running on Linux/Unix.
     * @return true if the application is running under Linux/Unix, else false.
     */
    public static boolean isUnix() {
        String os = System.getProperty("os.name").toLowerCase();
        return (os.indexOf("nix") >= 0 || os.indexOf("nux") >= 0);
    }
}

Java File Path Delete deleteDir(File dir)

Description

License

Parameter

Return

Declaration

Method Source Code

Related