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FullLabelStream.java
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FullLabelStream.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.scan;
import org.apache.commons.lang3.ArrayUtils;
import java.io.IOException;
import java.util.function.Supplier;
import org.neo4j.helpers.collection.Visitor;
import org.neo4j.kernel.api.labelscan.LabelScanWriter;
import org.neo4j.kernel.api.labelscan.NodeLabelUpdate;
import org.neo4j.kernel.impl.api.index.IndexStoreView;
import org.neo4j.kernel.impl.api.index.StoreScan;
import static org.neo4j.function.Predicates.ALWAYS_TRUE_INT;
/**
* {@link FullStoreChangeStream} using a {@link IndexStoreView} to get its data.
*/
public class FullLabelStream implements FullStoreChangeStream, Visitor<NodeLabelUpdate,IOException>
{
private final Supplier<IndexStoreView> lazyIndexStoreView;
private LabelScanWriter writer;
private long count;
public FullLabelStream( Supplier<IndexStoreView> lazyIndexStoreView )
{
this.lazyIndexStoreView = lazyIndexStoreView;
}
@Override
public long applyTo( LabelScanWriter writer ) throws IOException
{
// Keep the write for using it in visit
this.writer = writer;
IndexStoreView view = lazyIndexStoreView.get();
StoreScan<IOException> scan = view.visitNodes( ArrayUtils.EMPTY_INT_ARRAY, ALWAYS_TRUE_INT, null, this );
scan.run();
return count;
}
@Override
public boolean visit( NodeLabelUpdate update ) throws IOException
{
writer.write( update );
count++;
return false;
}
}