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CollectingIndexUpdater.java
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CollectingIndexUpdater.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.index.schema;
import java.util.ArrayList;
import java.util.Collection;
import org.neo4j.kernel.api.exceptions.index.IndexEntryConflictException;
import org.neo4j.kernel.api.index.IndexEntryUpdate;
import org.neo4j.kernel.api.index.IndexUpdater;
public abstract class CollectingIndexUpdater<KEY extends NativeIndexKey<KEY>,VALUE extends NativeIndexValue> implements IndexUpdater
{
private boolean closed;
private final Collection<IndexEntryUpdate<?>> updates = new ArrayList<>();
@Override
public void process( IndexEntryUpdate<?> update )
{
assertOpen();
updates.add( update );
}
@Override
public void close() throws IndexEntryConflictException
{
assertOpen();
apply( updates );
closed = true;
}
protected abstract void apply( Collection<IndexEntryUpdate<?>> updates ) throws IndexEntryConflictException;
private void assertOpen()
{
if ( closed )
{
throw new IllegalStateException( "Updater has been closed" );
}
}
}