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RelationshipCursor.java
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RelationshipCursor.java
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/*
* Copyright (c) 2002-2018 "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.newapi;
import org.neo4j.internal.kernel.api.NodeCursor;
import org.neo4j.internal.kernel.api.PropertyCursor;
import org.neo4j.internal.kernel.api.RelationshipDataAccessor;
import org.neo4j.kernel.impl.api.RelationshipVisitor;
import org.neo4j.kernel.impl.store.record.RelationshipRecord;
abstract class RelationshipCursor extends RelationshipRecord implements RelationshipDataAccessor, RelationshipVisitor<RuntimeException>
{
Read read;
private boolean hasChanges;
private boolean checkHasChanges;
RelationshipCursor()
{
super( NO_ID );
}
protected void init( Read read )
{
this.read = read;
this.checkHasChanges = true;
}
@Override
public long relationshipReference()
{
return getId();
}
@Override
public int label()
{
return getType();
}
@Override
public boolean hasProperties()
{
return nextProp != DefaultPropertyCursor.NO_ID;
}
@Override
public void source( NodeCursor cursor )
{
read.singleNode( sourceNodeReference(), cursor );
}
@Override
public void target( NodeCursor cursor )
{
read.singleNode( targetNodeReference(), cursor );
}
@Override
public void properties( PropertyCursor cursor )
{
read.relationshipProperties( relationshipReference(), propertiesReference(), cursor );
}
@Override
public long sourceNodeReference()
{
return getFirstNode();
}
@Override
public long targetNodeReference()
{
return getSecondNode();
}
@Override
public long propertiesReference()
{
return getNextProp();
}
protected abstract void collectAddedTxStateSnapshot();
/**
* RelationshipCursor should only see changes that are there from the beginning
* otherwise it will not be stable.
*/
protected boolean hasChanges()
{
if ( checkHasChanges )
{
hasChanges = read.hasTxStateWithChanges();
if ( hasChanges )
{
collectAddedTxStateSnapshot();
}
checkHasChanges = false;
}
return hasChanges;
}
// Load transaction state using RelationshipVisitor
protected void loadFromTxState( long reference )
{
read.txState().relationshipVisit( reference, this );
}
// used to visit transaction state
@Override
public void visit( long relationshipId, int typeId, long startNodeId, long endNodeId )
{
setId( relationshipId );
initialize( true, NO_ID, startNodeId, endNodeId, typeId, NO_ID, NO_ID, NO_ID, NO_ID, false, false );
}
}