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/*
* 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.Set;
import static org.junit.Assert.assertEquals;
import static org.onlab.graph.GraphPathSearch.ALL_PATHS;
/**
* Test of the BFS and similar path search algorithms.
*/
public class BreadthFirstSearchTest extends AbstractGraphPathSearchTest {
@Override
protected AbstractGraphPathSearch<TestVertex, TestEdge> graphSearch() {
return new BreadthFirstSearch<>();
}
@Test
public void defaultGraphTest() {
executeDefaultTest(7, 3, 8.0);
}
@Test
public void defaultHopCountWeight() {
weight = null;
executeDefaultTest(7, 3, 3.0);
}
// Executes the default test
protected void executeDefaultTest(int pathCount, int pathLength, double pathCost) {
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", pathLength, p.edges().size());
assertEquals("incorrect path cost", pathCost, p.cost(), 0.1);
paths = search.search(graph, A, null, weight, ALL_PATHS).paths();
printPaths(paths);
assertEquals("incorrect paths count", pathCount, paths.size());
}
// Executes the search and validates its results.
protected void executeSearch(GraphPathSearch<TestVertex, TestEdge> search,
Graph<TestVertex, TestEdge> graph,
TestVertex src, TestVertex dst,
EdgeWeight<TestVertex, TestEdge> weight,
int pathCount, double pathCost) {
GraphPathSearch.Result<TestVertex, TestEdge> result =
search.search(graph, src, dst, weight, ALL_PATHS);
Set<Path<TestVertex, TestEdge>> paths = result.paths();
printPaths(paths);
assertEquals("incorrect paths count", pathCount, paths.size());
if (pathCount > 0) {
Path<TestVertex, TestEdge> path = paths.iterator().next();
assertEquals("incorrect path cost", pathCost, path.cost(), 0.1);
}
}
// Executes the single-path search and validates its results.
protected void executeSinglePathSearch(GraphPathSearch<TestVertex, TestEdge> search,
Graph<TestVertex, TestEdge> graph,
TestVertex src, TestVertex dst,
EdgeWeight<TestVertex, TestEdge> weight,
int pathCount, double pathCost) {
GraphPathSearch.Result<TestVertex, TestEdge> result =
search.search(graph, src, dst, weight, 1);
Set<Path<TestVertex, TestEdge>> paths = result.paths();
printPaths(paths);
assertEquals("incorrect paths count", Math.min(pathCount, 1), paths.size());
if (pathCount > 0) {
Path<TestVertex, TestEdge> path = paths.iterator().next();
assertEquals("incorrect path cost", pathCost, path.cost(), 0.1);
}
}
}
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