/**
* Copyright (c) 2002-2013 "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.kernel.impl.storemigration.legacystore;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.LinkedList;
import org.neo4j.helpers.UTF8;
import org.neo4j.kernel.impl.nioneo.store.Record;
import org.neo4j.kernel.impl.nioneo.store.RelationshipTypeRecord;
public class LegacyRelationshipTypeStoreReader
{
public static final String FROM_VERSION = "RelationshipTypeStore v0.9.9";
private String fileName;
public LegacyRelationshipTypeStoreReader( String fileName )
{
this.fileName = fileName;
}
public Iterable<RelationshipTypeRecord> readRelationshipTypes() throws IOException
{
FileChannel fileChannel = new RandomAccessFile( fileName, "r" ).getChannel();
int recordLength = 5;
int endHeaderSize = UTF8.encode( FROM_VERSION ).length;
long recordCount = (fileChannel.size() - endHeaderSize) / recordLength;
LinkedList<RelationshipTypeRecord> records = new LinkedList<RelationshipTypeRecord>();
ByteBuffer buffer = ByteBuffer.allocateDirect( recordLength );
for ( int id = 0; id <= recordCount; id++ )
{
buffer.position( 0 );
fileChannel.read( buffer );
buffer.flip();
long inUseByte = buffer.get();
boolean inUse = inUseByte == Record.IN_USE.byteValue();
if (inUse) {
RelationshipTypeRecord record = new RelationshipTypeRecord( id );
record.setInUse( inUse );
record.setTypeBlock( buffer.getInt() );
records.add( record );
}
}
fileChannel.close();
return records;
}
}