set Posix Owners - Java File Path IO

Java examples for File Path IO:Unix File

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Description

set Posix Owners

Demo Code

/*-/*from   w ww.  j av  a 2 s. c  o  m*/
 * Copyright (C) 2014 Erik Larsson
 *
 * 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/>.
 */
//package com.java2s;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {
    public static void setPosixOwners(String path, int ownerId, int groupId)
            throws ClassNotFoundException, NoSuchMethodException,
            IllegalAccessException, IllegalArgumentException,
            InvocationTargetException, NoSuchFieldException {
        Class<?> fileSystemsClass = Class
                .forName("java.nio.file.FileSystems");
        Class<?> fileSystemClass = Class
                .forName("java.nio.file.FileSystem");
        Class<?> pathClass = Class.forName("java.nio.file.Path");
        Class<?> filesClass = Class.forName("java.nio.file.Files");
        Class<?> linkOptionClass = Class
                .forName("java.nio.file.LinkOption");

        Method fileSystemsGetDefaultMethod = fileSystemsClass
                .getMethod("getDefault");
        Method fileSystemGetPathMethod = fileSystemClass.getMethod(
                "getPath", String.class, String[].class);

        Field noFollowLinksField = linkOptionClass
                .getField("NOFOLLOW_LINKS");

        Object noFollowLinksObject = noFollowLinksField.get(null);
        Object linkOptionsArray = Array.newInstance(linkOptionClass, 1);
        Array.set(linkOptionsArray, 0, noFollowLinksObject);

        /* java.nio.file.FileSystem defaultFileSystem =
                   java.nio.file.FileSystems.getDefault(); */
        Object defaultFileSystemObject = fileSystemsGetDefaultMethod
                .invoke(null);

        /* java.nio.file.Path p = defaultFileSystem.getPath(path); */
        Object pObject = fileSystemGetPathMethod.invoke(
                defaultFileSystemObject, path, new String[0]);

        Method filesSetAttributeMethod = filesClass.getMethod(
                "setAttribute", pathClass, String.class, Object.class,
                linkOptionsArray.getClass());
        try {
            /* java.nio.file.Files.setAttribute(p, "unix:uid",
                    Integer.valueOf(ownerId),
                    java.nio.file.LinkOption.NOFOLLOW_LINKS);*/
            filesSetAttributeMethod.invoke(null, pObject, "unix:uid",
                    Integer.valueOf(ownerId), linkOptionsArray);

            /* java.nio.file.Files.setAttribute(p, "unix:gid",
                    Integer.valueOf(groupId),
                    java.nio.file.LinkOption.NOFOLLOW_LINKS); */
            filesSetAttributeMethod.invoke(null, pObject, "unix:gid",
                    Integer.valueOf(groupId), linkOptionsArray);
        } catch (InvocationTargetException ex) {
            final Throwable cause = ex.getCause();
            if (cause instanceof UnsupportedOperationException) {
                /* Do nothing. This is expected on non-UNIX platforms. */
            } else if (cause instanceof ClassNotFoundException) {
                throw (ClassNotFoundException) cause;
            } else if (cause instanceof NoSuchMethodException) {
                throw (NoSuchMethodException) cause;
            } else if (cause instanceof IllegalAccessException) {
                throw (IllegalAccessException) cause;
            } else if (cause instanceof IllegalArgumentException) {
                throw (IllegalArgumentException) cause;
            } else if (cause instanceof InvocationTargetException) {
                throw (InvocationTargetException) cause;
            } else if (cause instanceof NoSuchFieldException) {
                throw (NoSuchFieldException) cause;
            } else if (cause instanceof RuntimeException) {
                throw (RuntimeException) cause;
            } else {
                throw ex;
            }
        }
    }
}

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