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StoreSinglePropertyCursor.java
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StoreSinglePropertyCursor.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 java.util.function.Consumer;
import org.neo4j.kernel.api.properties.DefinedProperty;
import org.neo4j.kernel.impl.locking.Lock;
import org.neo4j.kernel.impl.store.RecordCursors;
import org.neo4j.storageengine.api.txstate.PropertyContainerState;
public class StoreSinglePropertyCursor extends StoreAbstractPropertyCursor
{
private final Consumer<StoreSinglePropertyCursor> instanceCache;
private int propertyKeyId;
StoreSinglePropertyCursor( RecordCursors cursors, Consumer<StoreSinglePropertyCursor> instanceCache )
{
super( cursors );
this.instanceCache = instanceCache;
}
public StoreSinglePropertyCursor init( int propertyKeyId, long firstPropertyId, Lock lock,
PropertyContainerState state )
{
this.propertyKeyId = propertyKeyId;
initialize( key -> key == propertyKeyId, firstPropertyId, lock, state );
return this;
}
@Override
protected boolean loadNextFromDisk()
{
// no if we have already fetched the property
if ( fetched )
{
return false;
}
// go to disk either if there is no state
// or if there is a state such state does not contain the keyId we are looking for
return state == null || state.getAddedProperty( propertyKeyId ) == null;
}
@Override
protected DefinedProperty nextAdded()
{
return !fetched && state != null ? (DefinedProperty) state.getAddedProperty( propertyKeyId ) : null;
}
@Override
protected void doClose()
{
instanceCache.accept( this );
}
}