/*
* Copyright (c) 2002-2009 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.util;
import java.io.File;
import java.io.IOException;
import java.nio.channels.FileChannel;
import org.neo4j.graphdb.NotFoundException;
public class FileUtils
{
private static int WINDOWS_RETRY_COUNT = 3;
public static boolean deleteFile( File file )
{
if ( !file.exists() )
{
return true;
}
int count = 0;
boolean deleted = false;
do
{
deleted = file.delete();
if ( !deleted )
{
count++;
waitSome();
}
}
while ( !deleted && count <= WINDOWS_RETRY_COUNT );
return deleted;
}
public static boolean renameFile( File srcFile, File renameToFile )
{
if ( !srcFile.exists() )
{
throw new NotFoundException( "Source file[" + srcFile.getName()
+ "] not found" );
}
if ( renameToFile.exists() )
{
throw new NotFoundException( "Source file[" + renameToFile.getName()
+ "] not found" );
}
int count = 0;
boolean renamed = false;
do
{
renamed = srcFile.renameTo( renameToFile );
if ( !renamed )
{
count++;
waitSome();
}
}
while ( !renamed && count <= WINDOWS_RETRY_COUNT );
return renamed;
}
public static void truncateFile( FileChannel fileChannel, long position )
throws IOException
{
int count = 0;
boolean success = false;
IOException cause = null;
do
{
count++;
try
{
fileChannel.truncate( position );
success = true;
}
catch ( IOException e )
{
cause = e;
}
}
while ( !success && count <= WINDOWS_RETRY_COUNT );
if ( !success )
{
throw cause;
}
}
private static void waitSome()
{
try
{
Thread.sleep( 500 );
}
catch ( InterruptedException ee )
{
Thread.interrupted();
} // ok
System.gc();
}
public static String fixSeparatorsInPath( String path )
{
String fileSeparator = System.getProperty( "file.separator" );
if ( "\\".equals( fileSeparator ) )
{
path = path.replace( '/', '\\' );
}
else if ( "/".equals( fileSeparator ) )
{
path = path.replace( '\\', '/' );
}
return path;
}
}