/
DynamicRecordFormat.java
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/
DynamicRecordFormat.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 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.store.format.busted;
import java.io.IOException;
import org.neo4j.io.pagecache.PageCursor;
import org.neo4j.io.pagecache.PagedFile;
import org.neo4j.kernel.impl.store.format.BaseOneByteHeaderRecordFormat;
import org.neo4j.kernel.impl.store.record.DynamicRecord;
import static org.neo4j.kernel.impl.store.format.lowlimit.DynamicRecordFormat.readData;
class DynamicRecordFormat extends BaseOneByteHeaderRecordFormat<DynamicRecord>
{
private static final int RECORD_HEADER_SIZE = 1/*header byte*/ + 3/*# of bytes*/ + 8/*max size of next reference*/;
// = 12
private static final int START_RECORD_BIT = 0x8;
protected DynamicRecordFormat()
{
super( INT_STORE_HEADER_READER, RECORD_HEADER_SIZE, IN_USE_BIT );
}
@Override
public DynamicRecord newRecord()
{
return new DynamicRecord( -1 );
}
@Override
protected void doRead( DynamicRecord record, PageCursor cursor, int recordSize, PagedFile storeFile,
long headerByte, boolean inUse ) throws IOException
{
int length = cursor.getShort() | cursor.getByte() << 16;
long next = cursor.getLong();
boolean isStartRecord = (headerByte & START_RECORD_BIT) != 0;
record.initialize( inUse, isStartRecord, next, -1, length );
readData( record, cursor );
}
@Override
protected void doWrite( DynamicRecord record, PageCursor cursor, int recordSize, PagedFile storeFile )
throws IOException
{
assert record.getLength() < (1 << 24) - 1;
byte headerByte = (byte) ((record.inUse() ? IN_USE_BIT : 0) |
(record.isStartRecord() ? START_RECORD_BIT : 0));
cursor.putByte( headerByte );
cursor.putShort( (short) record.getLength() );
cursor.putByte( (byte) (record.getLength() >>> 16 ) );
cursor.putLong( record.getNextBlock() );
cursor.putBytes( record.getData() );
}
@Override
public long getNextRecordReference( DynamicRecord record )
{
return record.getNextBlock();
}
}