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CountingDegreeVisitor.java
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CountingDegreeVisitor.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;
import org.neo4j.storageengine.api.Direction;
public class CountingDegreeVisitor implements DegreeVisitor
{
private final Direction direction;
private final int relType;
private final boolean dense;
private int count;
public CountingDegreeVisitor( Direction direction, boolean dense )
{
this( direction, -1, dense );
}
public CountingDegreeVisitor( Direction direction, int relType, boolean dense )
{
this.direction = direction;
this.relType = relType;
this.dense = dense;
}
@Override
public boolean visitDegree( int type, long outgoing, long incoming, long loop )
{
if ( relType == -1 || type == relType )
{
switch ( direction )
{
case OUTGOING:
count += outgoing + loop;
break;
case INCOMING:
count += incoming + loop;
break;
case BOTH:
count += outgoing + incoming + loop;
break;
default:
throw new IllegalStateException( "Unknown direction: " + direction );
}
// continue only if we are counting all types or the node is not dense (i.e., we visit one rel at the time)
return relType == -1 || !dense;
}
return true;
}
public int count()
{
return count;
}
}