Java Is Symbolic Link isSymlink(File file)

Description

is Symlink

License

Open Source License

Declaration

public static boolean isSymlink(File file) throws IOException 

Method Source Code

//package com.java2s;
/*//  w  ww . j  a  v a  2  s.co m
 * Hello Minecraft!.
 * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see {http://www.gnu.org/licenses/}.
 */

import java.io.File;

import java.io.IOException;

import java.util.Objects;

public class Main {
    public static boolean isSymlink(File file) throws IOException {
        Objects.requireNonNull(file, "File must not be null");
        if (File.separatorChar == '\\')
            return false;
        File fileInCanonicalDir;
        if (file.getParent() == null)
            fileInCanonicalDir = file;
        else {
            File canonicalDir = file.getParentFile().getCanonicalFile();
            fileInCanonicalDir = new File(canonicalDir, file.getName());
        }

        return !fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile());
    }

    public static String getName(String filename) {
        if (filename == null)
            return null;
        int index = indexOfLastSeparator(filename);
        return filename.substring(index + 1);
    }

    public static int indexOfLastSeparator(String filename) {
        if (filename == null)
            return -1;
        int lastUnixPos = filename.lastIndexOf(47);
        int lastWindowsPos = filename.lastIndexOf(92);
        return Math.max(lastUnixPos, lastWindowsPos);
    }
}

Related

1. isSymLink(File file)
2. isSymlink(File file)
3. isSymlink(File file)
4. isSymlink(File file)
5. isSymlink(File file)
6. isSymlink(File file)
7. isSymlink(File file)
8. isSymlink(File file)
9. isSymLink(File symlinkFile)