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DefaultFileSystemAbstraction.java
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DefaultFileSystemAbstraction.java
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/*
* Copyright (c) 2002-2016 "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 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 org.neo4j.io.fs;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.RandomAccessFile;
import java.io.Reader;
import java.io.Writer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.nio.file.CopyOption;
import java.nio.file.Files;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
import org.neo4j.io.IOUtils;
import static java.lang.String.format;
/**
* Default file system abstraction that creates files using the underlying file system.
*/
public class DefaultFileSystemAbstraction implements FileSystemAbstraction
{
static final String UNABLE_TO_CREATE_DIRECTORY_FORMAT = "Unable to create directory path [%s] for Neo4j store.";
@Override
public StoreFileChannel open( File fileName, String mode ) throws IOException
{
// Returning only the channel is ok, because the channel, when close()d will close its parent File.
FileChannel channel = new RandomAccessFile( fileName, mode ).getChannel();
return getStoreFileChannel( channel );
}
@Override
public OutputStream openAsOutputStream( File fileName, boolean append ) throws IOException
{
return new FileOutputStream( fileName, append );
}
@Override
public InputStream openAsInputStream( File fileName ) throws IOException
{
return new FileInputStream( fileName );
}
@Override
public Reader openAsReader( File fileName, Charset charset ) throws IOException
{
return new InputStreamReader( new FileInputStream( fileName ), charset );
}
@Override
public Writer openAsWriter( File fileName, Charset charset, boolean append ) throws IOException
{
return new OutputStreamWriter( new FileOutputStream( fileName, append ), charset );
}
@Override
public StoreFileChannel create( File fileName ) throws IOException
{
return open( fileName, "rw" );
}
@Override
public boolean mkdir( File fileName )
{
return fileName.mkdir();
}
@Override
public void mkdirs( File path ) throws IOException
{
if ( path.exists() )
{
return;
}
path.mkdirs();
if ( path.exists() )
{
return;
}
throw new IOException( format( UNABLE_TO_CREATE_DIRECTORY_FORMAT, path ) );
}
@Override
public boolean fileExists( File fileName )
{
return fileName.exists();
}
@Override
public long getFileSize( File fileName )
{
return fileName.length();
}
@Override
public boolean deleteFile( File fileName )
{
return FileUtils.deleteFile( fileName );
}
@Override
public void deleteRecursively( File directory ) throws IOException
{
FileUtils.deleteRecursively( directory );
}
@Override
public void renameFile( File from, File to, CopyOption... copyOptions ) throws IOException
{
Files.move( from.toPath(), to.toPath(), copyOptions );
}
@Override
public File[] listFiles( File directory )
{
return directory.listFiles();
}
@Override
public File[] listFiles( File directory, FilenameFilter filter )
{
return directory.listFiles( filter );
}
@Override
public boolean isDirectory( File file )
{
return file.isDirectory();
}
@Override
public void moveToDirectory( File file, File toDirectory ) throws IOException
{
FileUtils.moveFileToDirectory( file, toDirectory );
}
@Override
public void copyFile( File from, File to ) throws IOException
{
FileUtils.copyFile( from, to );
}
@Override
public void copyRecursively( File fromDirectory, File toDirectory ) throws IOException
{
FileUtils.copyRecursively( fromDirectory, toDirectory );
}
private final Map<Class<? extends ThirdPartyFileSystem>, ThirdPartyFileSystem> thirdPartyFileSystems =
new HashMap<>();
@Override
public synchronized <K extends ThirdPartyFileSystem> K getOrCreateThirdPartyFileSystem(
Class<K> clazz, Function<Class<K>, K> creator )
{
ThirdPartyFileSystem fileSystem = thirdPartyFileSystems.get( clazz );
if (fileSystem == null)
{
thirdPartyFileSystems.put( clazz, fileSystem = creator.apply( clazz ) );
}
return clazz.cast( fileSystem );
}
@Override
public void truncate( File path, long size ) throws IOException
{
FileUtils.truncateFile( path, size );
}
@Override
public long lastModifiedTime( File file )
{
return file.lastModified();
}
@Override
public void deleteFileOrThrow( File file ) throws IOException
{
Files.delete( file.toPath() );
}
protected StoreFileChannel getStoreFileChannel( FileChannel channel )
{
return new StoreFileChannel( channel );
}
@Override
public void close() throws IOException
{
IOUtils.closeAll( thirdPartyFileSystems.values() );
}
}