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SecondaryPageCursorWriteDataAdapter.java
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SecondaryPageCursorWriteDataAdapter.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.highlimit;
import java.io.IOException;
import org.neo4j.io.pagecache.PageCursor;
import org.neo4j.kernel.impl.store.UnderlyingStorageException;
import org.neo4j.kernel.impl.store.format.highlimit.Reference.DataAdapter;
import static org.neo4j.kernel.impl.store.format.BaseRecordFormat.IN_USE_BIT;
import static org.neo4j.kernel.impl.store.format.highlimit.BaseHighLimitRecordFormat.HEADER_BIT_RECORD_UNIT;
/**
* {@link DataAdapter} able to move the {@link PageCursor} to another record, potentially on another page,
* for continued writing of contents to a secondary record unit.
*/
class SecondaryPageCursorWriteDataAdapter implements DataAdapter<PageCursor>
{
private boolean switched;
private final long pageIdForSecondaryRecord;
private final int offsetForSecondaryId;
private final int primaryEndOffset;
SecondaryPageCursorWriteDataAdapter( long pageIdForSecondaryRecord,
int offsetForSecondaryId, int primaryEndOffset )
{
this.pageIdForSecondaryRecord = pageIdForSecondaryRecord;
this.offsetForSecondaryId = offsetForSecondaryId;
this.primaryEndOffset = primaryEndOffset;
}
@Override
public byte getByte( PageCursor source )
{
throw new UnsupportedOperationException();
}
@Override
public short getShort( PageCursor cursor )
{
throw new UnsupportedOperationException();
}
@Override
public void putByte( byte oneByte, PageCursor cursor ) throws IOException
{
if ( !switched && cursor.getOffset() == primaryEndOffset )
{
if ( !cursor.next( pageIdForSecondaryRecord ) )
{
throw new UnderlyingStorageException( "Couldn't move to secondary page " + pageIdForSecondaryRecord );
}
cursor.setOffset( offsetForSecondaryId );
cursor.putByte( (byte) (IN_USE_BIT | HEADER_BIT_RECORD_UNIT) );
switched = true;
}
cursor.putByte( oneByte );
}
}