org.jgrapht.util.WeightCombiner Maven / Gradle / Ivy
/*
* (C) Copyright 2009-2017, by Ilya Razenshteyn and Contributors.
*
* JGraphT : a free Java graph-theory library
*
* This program and the accompanying materials are dual-licensed under
* either
*
* (a) the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation, or (at your option) any
* later version.
*
* or (per the licensee's choosing)
*
* (b) the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation.
*/
package org.jgrapht.util;
/**
* Binary operator for edge weights. There are some prewritten operators.
*/
public interface WeightCombiner
{
/**
* Sum of weights.
*/
WeightCombiner SUM = (a, b) -> a + b;
/**
* Multiplication of weights.
*/
WeightCombiner MULT = (a, b) -> a * b;
/**
* Minimum weight.
*/
WeightCombiner MIN = (a, b) -> Math.min(a, b);
/**
* Maximum weight.
*/
WeightCombiner MAX = (a, b) -> Math.max(a, b);
/**
* First weight.
*/
WeightCombiner FIRST = (a, b) -> a;
/**
* Second weight.
*/
WeightCombiner SECOND = (a, b) -> b;
/**
* Combines two weights.
*
* @param a first weight
* @param b second weight
*
* @return result of the operator
*/
double combine(double a, double b);
}
// End WeightCombiner.java