chmod via Java NIO - Java File Path IO

Java examples for File Path IO:File Attribute

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Description

chmod via Java NIO

Demo Code

/*/*w ww. ja  v a  2  s .c  om*/
 * Copyright 2014 The Codehaus Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import javax.annotation.Nonnull;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.attribute.PosixFilePermission;
import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] argv) throws Exception {
        File file = new File("Main.java");
        int mode = 2;
        chmod(file, mode);
    }

    public static void chmod(@Nonnull File file, int mode)
            throws IOException {
        final Path path = file.toPath();
        if (!Files.isSymbolicLink(path)) {
            Files.setPosixFilePermissions(path, getPermissions(mode));
        }
    }

    @Nonnull
    public static Set<PosixFilePermission> getPermissions(int mode) {
        Set<PosixFilePermission> perms = new HashSet<PosixFilePermission>();
        //add owners permission
        if ((mode & 0400) > 0) {
            perms.add(PosixFilePermission.OWNER_READ);
        }
        if ((mode & 0200) > 0) {
            perms.add(PosixFilePermission.OWNER_WRITE);
        }
        if ((mode & 0100) > 0) {
            perms.add(PosixFilePermission.OWNER_EXECUTE);
        }
        //add group permissions
        if ((mode & 0040) > 0) {
            perms.add(PosixFilePermission.GROUP_READ);
        }
        if ((mode & 0020) > 0) {
            perms.add(PosixFilePermission.GROUP_WRITE);
        }
        if ((mode & 0010) > 0) {
            perms.add(PosixFilePermission.GROUP_EXECUTE);
        }
        //add others permissions
        if ((mode & 0004) > 0) {
            perms.add(PosixFilePermission.OTHERS_READ);
        }
        if ((mode & 0002) > 0) {
            perms.add(PosixFilePermission.OTHERS_WRITE);
        }
        if ((mode & 0001) > 0) {
            perms.add(PosixFilePermission.OTHERS_EXECUTE);
        }
        return perms;
    }
}

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