| /* |
| * Copyright 2014-2015 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onlab.graph; |
| |
| import org.junit.Test; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.onlab.graph.GraphPathSearch.ALL_PATHS; |
| |
| /** |
| * Test of the Bellman-Ford algorithm. |
| */ |
| public class BellmanFordGraphSearchTest extends BreadthFirstSearchTest { |
| |
| @Override |
| protected AbstractGraphPathSearch<TestVertex, TestEdge> graphSearch() { |
| return new BellmanFordGraphSearch<>(); |
| } |
| |
| @Test |
| @Override |
| public void defaultGraphTest() { |
| executeDefaultTest(7, 5, 5.0); |
| } |
| |
| @Test |
| public void defaultHopCountWeight() { |
| weight = null; |
| executeDefaultTest(10, 3, 3.0); |
| } |
| |
| @Test |
| public void searchGraphWithNegativeCycles() { |
| Set<TestVertex> vertexes = new HashSet<>(vertexes()); |
| vertexes.add(Z); |
| |
| Set<TestEdge> edges = new HashSet<>(edges()); |
| edges.add(new TestEdge(G, Z, 1.0)); |
| edges.add(new TestEdge(Z, G, -2.0)); |
| |
| graph = new AdjacencyListsGraph<>(vertexes, edges); |
| |
| GraphPathSearch<TestVertex, TestEdge> search = graphSearch(); |
| Set<Path<TestVertex, TestEdge>> paths = search.search(graph, A, H, weight, ALL_PATHS).paths(); |
| assertEquals("incorrect paths count", 1, paths.size()); |
| |
| Path p = paths.iterator().next(); |
| assertEquals("incorrect src", A, p.src()); |
| assertEquals("incorrect dst", H, p.dst()); |
| assertEquals("incorrect path length", 5, p.edges().size()); |
| assertEquals("incorrect path cost", 5.0, p.cost(), 0.1); |
| |
| paths = search.search(graph, A, G, weight, ALL_PATHS).paths(); |
| assertEquals("incorrect paths count", 0, paths.size()); |
| |
| paths = search.search(graph, A, null, weight, ALL_PATHS).paths(); |
| printPaths(paths); |
| assertEquals("incorrect paths count", 6, paths.size()); |
| } |
| |
| } |