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StoreIteratorRelationshipCursor.java
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StoreIteratorRelationshipCursor.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.collection.primitive.PrimitiveLongIterator;
import org.neo4j.graphdb.Resource;
import org.neo4j.kernel.api.AssertOpen;
import org.neo4j.kernel.impl.locking.LockService;
import org.neo4j.kernel.impl.store.RecordCursors;
import org.neo4j.kernel.impl.store.record.RelationshipRecord;
import org.neo4j.kernel.impl.util.InstanceCache;
import static org.neo4j.kernel.impl.store.record.RecordLoad.CHECK;
/**
* Cursor for iterating a set of relationships.
*/
public class StoreIteratorRelationshipCursor extends StoreAbstractRelationshipCursor
{
private PrimitiveLongIterator iterator;
private final InstanceCache<StoreIteratorRelationshipCursor> instanceCache;
public StoreIteratorRelationshipCursor( RelationshipRecord relationshipRecord,
InstanceCache<StoreIteratorRelationshipCursor> instanceCache,
RecordCursors cursors,
LockService lockService )
{
super( relationshipRecord, cursors, lockService );
this.instanceCache = instanceCache;
}
public StoreIteratorRelationshipCursor init( PrimitiveLongIterator iterator, AssertOpen assertOpen )
{
initialize( assertOpen );
this.iterator = iterator;
return this;
}
@Override
public boolean next()
{
while ( iterator != null && iterator.hasNext() )
{
if ( relationshipRecordCursor.next( iterator.next(), relationshipRecord, CHECK ) )
{
return true;
}
}
return false;
}
@Override
public void close()
{
if ( iterator instanceof Resource )
{
((Resource) iterator).close();
}
iterator = null;
instanceCache.accept( this );
}
}