Volume.java

/*
 * This file is part of the Trickl Open Source Libraries.
 *
 * Trickl Open Source Libraries - http://open.trickl.com/
 *
 * Copyright (C) 2011 Tim Gee.
 *
 * Trickl Open Source Libraries are 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.
 *
 * Trickl Open Source Libraries are 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 project.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.trickl.graph;

import org.jgrapht.Graph;

public class Volume<V, E> {

   private Graph<V, E> graph;
   private Double volume;

   public Volume(Graph<V, E> graph) {
      this.graph = graph;
   }

   public double getVolume() {
      if (volume == null) {
         volume = 0.;
         for (V vertex : graph.vertexSet()) {
            for (E edge : graph.edgesOf(vertex)) {
               volume += graph.getEdgeWeight(edge);
            }
         }        
      }

      return volume;
   }
}