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WeightedPathImpl.java
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WeightedPathImpl.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.graphalgo.impl.util;
import java.util.Iterator;
import org.neo4j.graphalgo.CostEvaluator;
import org.neo4j.graphalgo.WeightedPath;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.PropertyContainer;
import org.neo4j.graphdb.Relationship;
public class WeightedPathImpl implements WeightedPath
{
private final Path path;
private final double weight;
public WeightedPathImpl( CostEvaluator<Double> costEvaluator, Path path )
{
this.path = path;
double cost = 0;
for ( Relationship relationship : path.relationships() )
{
cost += costEvaluator.getCost( relationship, Direction.OUTGOING );
}
this.weight = cost;
}
public WeightedPathImpl( double weight, Path path )
{
this.path = path;
this.weight = weight;
}
public double weight()
{
return weight;
}
public Node startNode()
{
return path.startNode();
}
public Node endNode()
{
return path.endNode();
}
public Relationship lastRelationship()
{
return path.lastRelationship();
}
public int length()
{
return path.length();
}
public Iterable<Node> nodes()
{
return path.nodes();
}
@Override
public Iterable<Node> reverseNodes()
{
return path.reverseNodes();
}
public Iterable<Relationship> relationships()
{
return path.relationships();
}
@Override
public Iterable<Relationship> reverseRelationships()
{
return path.reverseRelationships();
}
@Override
public String toString()
{
return path.toString() + " weight:" + this.weight;
}
public Iterator<PropertyContainer> iterator()
{
return path.iterator();
}
}