Java FileChannel Copy doCopyDirectory(File srcDir, File destDir, boolean preserveFileDate, List exclusionList)

Description

Internal copy directory method.

License

Apache License

Parameter

Parameter	Description
srcDir	the validated source directory, must not be <code>null</code>
destDir	the validated destination directory, must not be <code>null</code>
preserveFileDate	whether to preserve the file date
exclusionList	List of files and directories to exclude from the copy, may be null

Exception

Parameter	Description
IOException	if an error occurs

Declaration

private static void doCopyDirectory(File srcDir, File destDir, boolean preserveFileDate,
        List<String> exclusionList) throws IOException 

Method Source Code

//package com.java2s;
/* GROOVE: GRaphs for Object Oriented VErification
 * Copyright 2003--2010 University of Twente
 *
 * 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.
 *
 * $Id: Util.java 5482 2014-07-20 22:25:43Z rensink $
 *///from   www. j  av a2 s .co m

import java.io.File;
import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.nio.channels.FileChannel;

import java.util.List;

public class Main {
    /**
     * The number of bytes in a 50 MB.
     */
    private static final long FIFTY_MB = 1024 * 1024 * 50;

    /**
     * Internal copy directory method.
     *
     * @param srcDir  the validated source directory, must not be <code>null</code>
     * @param destDir  the validated destination directory, must not be <code>null</code>
     * @param preserveFileDate  whether to preserve the file date
     * @param exclusionList  List of files and directories to exclude from the copy, may be null
     * @throws IOException if an error occurs
     * @since Commons IO 1.1
     */
    private static void doCopyDirectory(File srcDir, File destDir, boolean preserveFileDate,
            List<String> exclusionList) throws IOException {
        // recurse
        File[] files = srcDir.listFiles();
        if (files == null) { // null if security restricted
            throw new IOException("Failed to list contents of " + srcDir);
        }
        if (destDir.exists()) {
            if (destDir.isDirectory() == false) {
                throw new IOException("Destination '" + destDir + "' exists but is not a directory");
            }
        } else {
            if (destDir.mkdirs() == false) {
                throw new IOException("Destination '" + destDir + "' directory cannot be created");
            }
        }
        if (destDir.canWrite() == false) {
            throw new IOException("Destination '" + destDir + "' cannot be written to");
        }
        for (File file : files) {
            File copiedFile = new File(destDir, file.getName());
            if (exclusionList == null || !exclusionList.contains(file.getCanonicalPath())) {
                if (file.isDirectory()) {
                    doCopyDirectory(file, copiedFile, preserveFileDate, exclusionList);
                } else {
                    doCopyFile(file, copiedFile, preserveFileDate);
                }
            }
        }

        // Do this last, as the above has probably affected directory metadata
        if (preserveFileDate) {
            destDir.setLastModified(srcDir.lastModified());
        }
    }

    /**
     * Internal copy file method.
     *
     * @param srcFile  the validated source file, must not be <code>null</code>
     * @param destFile  the validated destination file, must not be <code>null</code>
     * @param preserveFileDate  whether to preserve the file date
     * @throws IOException if an error occurs
     */
    private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
        if (destFile.exists() && destFile.isDirectory()) {
            throw new IOException("Destination '" + destFile + "' exists but is a directory");
        }

        FileInputStream fis = null;
        FileOutputStream fos = null;
        FileChannel input = null;
        FileChannel output = null;
        try {
            fis = new FileInputStream(srcFile);
            fos = new FileOutputStream(destFile);
            input = fis.getChannel();
            output = fos.getChannel();
            long size = input.size();
            long pos = 0;
            long count = 0;
            while (pos < size) {
                count = (size - pos) > FIFTY_MB ? FIFTY_MB : (size - pos);
                pos += output.transferFrom(input, pos, count);
            }
        } finally {
            output.close();
            fos.close();
            input.close();
            fis.close();
        }

        if (srcFile.length() != destFile.length()) {
            throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile + "'");
        }
        if (preserveFileDate) {
            destFile.setLastModified(srcFile.lastModified());
        }
    }
}

Related

1. copyTree(final File source, final File dest)
2. copyURLToFile(URL in, File out)
3. copyUsingNIO(String src, String dest)
4. copyWithChannels(File aSourceFile, File aTargetFile, boolean aAppend)
5. directoryCopy(URL source, URL destination)
6. doCopyFile(File srcFile, File destFile, boolean preserveFileDate)
7. doCopyFile(File srcFile, File destFile, boolean preserveFileDate)
8. fCopy(FileInputStream src, File dest)
9. fileChannelCopy(File src, File dest)