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/***************************************************************************
* Copyright (c) 2004 - 2007 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.io;
import org.eclipse.net4j.util.ImplementationError;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
/**
* @author Eike Stepper
*/
public final class NIOUtil
{
private NIOUtil()
{
}
/**
* TODO Look at {@link #copy(File, File, boolean)}
*/
public static void copyFile(File source, File target)
{
// http://www.javalobby.org/java/forums/t17036.html
// http://java.sun.com/developer/JDCTechTips/2002/tt0507.html#tip1
FileChannel sourceChannel = null;
FileChannel targetChannel = null;
try
{
if (!target.getParentFile().exists())
{
target.getParentFile().mkdirs();
}
if (!target.exists())
{
target.createNewFile();
}
sourceChannel = new FileInputStream(source).getChannel();
targetChannel = new FileOutputStream(target).getChannel();
long size = sourceChannel.size();
long transfered = sourceChannel.transferTo(0, size, targetChannel);
if (transfered != size)
{
throw new ImplementationError("Seems as if a loop must be implemented here");
}
}
catch (IOException ex)
{
throw new IORuntimeException(ex);
}
finally
{
IOUtil.closeSilent(sourceChannel);
IOUtil.closeSilent(targetChannel);
}
}
/**
* Copy source file to destination. If destination is a path then source file
* name is appended. If destination file exists then: overwrite=true -
* destination file is replaced; overwite=false - exception is thrown.
*
* @param src
* source file
* @param dst
* destination file or path
* @param overwrite
* overwrite destination file
* @exception IOException
* I/O problem
* @exception IllegalArgumentException
* illegal argument
*/
@SuppressWarnings("unused")
private static void copy(final File src, File dst, final boolean overwrite) throws IOException,
IllegalArgumentException
{
long q = System.currentTimeMillis();
// checks
if (!src.isFile() || !src.exists())
throw new IllegalArgumentException("Source file '" + src.getAbsolutePath() + "' not found!");
if (dst.exists()) if (dst.isDirectory()) // Directory? -> use source file
// name
dst = new File(dst, src.getName());
else if (dst.isFile())
{
if (!overwrite)
throw new IllegalArgumentException("Destination file '" + dst.getAbsolutePath() + "' already exists!");
}
else
throw new IllegalArgumentException("Invalid destination object '" + dst.getAbsolutePath() + "'!");
File dstParent = dst.getParentFile();
if (!dstParent.exists())
if (!dstParent.mkdirs()) throw new IOException("Failed to create directory " + dstParent.getAbsolutePath());
long fileSize = src.length();
if (fileSize > 20971520l)
{ // for larger files (20Mb) use streams
FileInputStream in = new FileInputStream(src);
FileOutputStream out = new FileOutputStream(dst);
try
{
int doneCnt = -1, bufSize = 32768;
byte buf[] = new byte[bufSize];
while ((doneCnt = in.read(buf, 0, bufSize)) >= 0)
if (doneCnt == 0)
Thread.yield();
else
out.write(buf, 0, doneCnt);
out.flush();
}
finally
{
try
{
in.close();
}
catch (IOException e)
{
}
try
{
out.close();
}
catch (IOException e)
{
}
}
}
else
{ // smaller files, use channels
FileInputStream fis = new FileInputStream(src);
FileOutputStream fos = new FileOutputStream(dst);
FileChannel in = fis.getChannel(), out = fos.getChannel();
try
{
long offs = 0, doneCnt = 0, copyCnt = Math.min(65536, fileSize);
do
{
doneCnt = in.transferTo(offs, copyCnt, out);
offs += doneCnt;
fileSize -= doneCnt;
}
while (fileSize > 0);
}
finally
{ // cleanup
try
{
in.close();
}
catch (IOException e)
{
}
try
{
out.close();
}
catch (IOException e)
{
}
try
{
fis.close();
}
catch (IOException e)
{
}
try
{
fos.close();
}
catch (IOException e)
{
}
}
} // else
System.out.println(">>> " + String.valueOf(src.length() / 1024) + " Kb, "
+ String.valueOf(System.currentTimeMillis() - q));
} // copy
}
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