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DegreeItemDenseCursor.java
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DegreeItemDenseCursor.java
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/*
* Copyright (c) 2002-2017 "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.api.store;
import org.neo4j.cursor.Cursor;
import org.neo4j.kernel.impl.store.RecordCursor;
import org.neo4j.kernel.impl.store.RecordCursors;
import org.neo4j.kernel.impl.store.record.NodeRecord;
import org.neo4j.kernel.impl.store.record.Record;
import org.neo4j.kernel.impl.store.record.RelationshipGroupRecord;
import org.neo4j.kernel.impl.store.record.RelationshipRecord;
import org.neo4j.storageengine.api.DegreeItem;
import static org.neo4j.kernel.impl.store.record.RecordLoad.FORCE;
class DegreeItemDenseCursor implements Cursor<DegreeItem>, DegreeItem, DegreeCounter
{
private final NodeRecord nodeRecord;
private final RelationshipGroupRecord relationshipGroupRecord;
private final RelationshipRecord relationshipRecord;
private final RecordCursors recordCursors;
private long groupId;
private int type;
private long outgoing;
private long incoming;
DegreeItemDenseCursor( long groupId,
NodeRecord nodeRecord,
RelationshipGroupRecord relationshipGroupRecord,
RelationshipRecord relationshipRecord,
RecordCursors recordCursors )
{
this.groupId = groupId;
this.nodeRecord = nodeRecord;
this.relationshipGroupRecord = relationshipGroupRecord;
this.relationshipRecord = relationshipRecord;
this.recordCursors = recordCursors;
}
@Override
public boolean next()
{
while ( groupId != Record.NO_NEXT_RELATIONSHIP.intValue() )
{
boolean groupRecordInUse = recordCursors.relationshipGroup().next( groupId, relationshipGroupRecord, FORCE );
groupId = relationshipGroupRecord.getNext();
if ( groupRecordInUse )
{
this.type = relationshipGroupRecord.getType();
long firstLoop = relationshipGroupRecord.getFirstLoop();
long firstOut = relationshipGroupRecord.getFirstOut();
long firstIn = relationshipGroupRecord.getFirstIn();
RecordCursor<RelationshipRecord> relationshipCursor = recordCursors.relationship();
long loop = countByFirstPrevPointer( firstLoop, relationshipCursor, nodeRecord, relationshipRecord );
this.outgoing =
countByFirstPrevPointer( firstOut, relationshipCursor, nodeRecord, relationshipRecord ) + loop;
this.incoming =
countByFirstPrevPointer( firstIn, relationshipCursor, nodeRecord, relationshipRecord ) + loop;
return true;
}
}
return false;
}
@Override
public void close()
{
}
@Override
public DegreeItem get()
{
return this;
}
@Override
public int type()
{
return type;
}
@Override
public long outgoing()
{
return outgoing;
}
@Override
public long incoming()
{
return incoming;
}
}