Java Path File Time nio setFileTimes(String path, Date creationTime, Date lastAccessTime, Date lastModifiedTime)

Description

set File Times

License

Open Source License

Declaration

public static void setFileTimes(String path, Date creationTime, Date lastAccessTime, Date lastModifiedTime)
            throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, IllegalArgumentException,
            InvocationTargetException, NoSuchFieldException 

Method Source Code

//package com.java2s;
/*-//  w  w w.  jav a2  s .co  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/>.
 */

import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;

public class Main {
    public static void setFileTimes(String path, Date creationTime, Date lastAccessTime, Date lastModifiedTime)
            throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, IllegalArgumentException,
            InvocationTargetException, NoSuchFieldException {
        Class<?> pathClass = Class.forName("java.nio.file.Path");
        Class<?> fileSystemsClass = Class.forName("java.nio.file.FileSystems");
        Class<?> fileSystemClass = Class.forName("java.nio.file.FileSystem");
        Class<?> basicFileAttributeViewClass = Class.forName("java.nio.file.attribute.BasicFileAttributeView");
        Class<?> filesClass = Class.forName("java.nio.file.Files");
        Class<?> linkOptionClass = Class.forName("java.nio.file.LinkOption");
        Class<?> fileTimeClass = Class.forName("java.nio.file.attribute.FileTime");

        /* FileSystem defaultFileSystem = FileSystems.getDefault(); */
        Method fileSystemsGetDefaultMethod = fileSystemsClass.getMethod("getDefault");
        Object defaultFileSystemObject = fileSystemsGetDefaultMethod.invoke(null);

        /* Path p = defaultFileSystem.getPath(path); */
        Method fileSystemGetPathMethod = fileSystemClass.getMethod("getPath", String.class, String[].class);
        Object pObject = fileSystemGetPathMethod.invoke(defaultFileSystemObject, path, new String[0]);

        /* BasicFileAttributeView attrView =
         *         Files.getFileAttributeView(p, BasicFileAttributeView.class,
         *         LinkOption.NOFOLLOW_LINKS); */
        Field noFollowLinksField = linkOptionClass.getField("NOFOLLOW_LINKS");
        Object noFollowLinksObject = noFollowLinksField.get(null);

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

        Method getFileAttributeViewMethod = filesClass.getMethod("getFileAttributeView", pathClass, Class.class,
                linkOptionsArray.getClass());
        Object attrViewObject = getFileAttributeViewMethod.invoke(null, pObject, basicFileAttributeViewClass,
                linkOptionsArray);

        /*
         * FileTime creationFileTime;
         * if(creationTime != null) {
         *     creationFileTime = FileTime.fromMillis(creationTime.getTime());
         * }
         * else {
         *     creationFileTime = null;
         * }
         */
        Object creationFileTimeObject;
        if (creationTime != null) {
            Method fileTimefromMillisMethod = fileTimeClass.getMethod("fromMillis", long.class);
            creationFileTimeObject = fileTimefromMillisMethod.invoke(null, Long.valueOf(creationTime.getTime()));
        } else {
            creationFileTimeObject = null;
        }

        /*
         * FileTime lastAccessFileTime;
         * if(lastAccessTime != null) {
         *     lastAccessFileTime =
         *         FileTime.fromMillis(lastAccessTime.getTime());
         * }
         * else {
         *     lastAccessFileTime = null;
         * }
         */
        Object lastAccessFileTimeObject;
        if (lastAccessTime != null) {
            Method fileTimefromMillisMethod = fileTimeClass.getMethod("fromMillis", long.class);
            lastAccessFileTimeObject = fileTimefromMillisMethod.invoke(null,
                    Long.valueOf(lastAccessTime.getTime()));
        } else {
            lastAccessFileTimeObject = null;
        }

        /*
         * FileTime lastModifiedFileTime;
         * if(lastModifiedTime != null) {
         *     lastModifiedFileTime =
         *         FileTime.fromMillis(lastModifiedTime.getTime());
         * }
         * else {
         *     lastModifiedFileTime = null;
         * }
         */
        Object lastModifiedFileTimeObject;
        if (lastModifiedTime != null) {
            Method fileTimefromMillisMethod = fileTimeClass.getMethod("fromMillis", long.class);
            lastModifiedFileTimeObject = fileTimefromMillisMethod.invoke(null,
                    Long.valueOf(lastModifiedTime.getTime()));
        } else {
            lastModifiedFileTimeObject = null;
        }

        /* attrView.setTimes(lastModifiedFileTime, lastAccessFileTime,
         *     creationFileTime); */
        Method basicFileAttributeViewSetTimesMethod = basicFileAttributeViewClass.getMethod("setTimes",
                fileTimeClass, fileTimeClass, fileTimeClass);
        try {
            basicFileAttributeViewSetTimesMethod.invoke(attrViewObject, lastModifiedFileTimeObject,
                    lastAccessFileTimeObject, creationFileTimeObject);
        } catch (InvocationTargetException ex) {
            final Throwable cause = ex.getCause();
            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;
            }
        }
    }
}

Related

1. getLastAccessTime(Path file)
2. getLastModificationTime(Path path)
3. getLastModifiedTime(Path path)
4. getLastModifiedTimeInMillis(Path path)
5. getMTime(Path path)
6. setTimes(Path path, Date time)