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EntityLoadingIterator.java
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EntityLoadingIterator.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.cursor.Cursor;
import org.neo4j.function.ThrowingLongFunction;
import org.neo4j.helpers.collection.PrefetchingIterator;
import org.neo4j.kernel.api.exceptions.EntityNotFoundException;
import org.neo4j.storageengine.api.EntityItem;
public class EntityLoadingIterator<T extends EntityItem> extends PrefetchingIterator<Cursor<T>>
{
private final PrimitiveLongIterator ids;
private final ThrowingLongFunction<Cursor<T>,EntityNotFoundException> loader;
public EntityLoadingIterator( PrimitiveLongIterator ids,
ThrowingLongFunction<Cursor<T>,EntityNotFoundException> loader )
{
this.ids = ids;
this.loader = loader;
}
@Override
protected Cursor<T> fetchNextOrNull()
{
while ( ids.hasNext() )
{
try
{
return loader.apply( ids.next() );
}
catch ( EntityNotFoundException e )
{
// skip this id
}
}
return null;
}
}