/**
* Copyright (c) 2002-2012 "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.consistency.store.windowpool;
import static java.nio.channels.FileChannel.MapMode.READ_ONLY;
import java.io.IOException;
import java.nio.channels.FileChannel;
public class FileMapper
{
private final FileChannel fileChannel;
public FileMapper( FileChannel fileChannel )
{
this.fileChannel = fileChannel;
}
public long fileSizeInBytes() throws IOException
{
return fileChannel.size();
}
public MappedWindow mapWindow( long firstRecord, int recordsPerPage, int bytesPerRecord ) throws IOException
{
return new MappedWindow( recordsPerPage, bytesPerRecord, firstRecord,
fileChannel.map( READ_ONLY, firstRecord * bytesPerRecord, recordsPerPage * bytesPerRecord ) );
}
}