/*
* Copyright 2003-2011 JetBrains s.r.o.
*
* 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 jetbrains.mps.make.dependencies;
import jetbrains.mps.make.dependencies.IntGraph.IntVertex;
import jetbrains.mps.make.dependencies.graph.Graph;
import jetbrains.mps.make.dependencies.graph.Graphs;
import jetbrains.mps.make.dependencies.graph.IVertex;
import jetbrains.mps.util.GraphUtil;
import junit.framework.TestCase;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
public class GraphTestCase extends TestCase {
private IntGraph myGraph;
private static final int N = 6;
@Override
public void setUp() {
myGraph = new IntGraph(N);
myGraph.addEdges(0, 1, 2);
myGraph.addEdges(1, 3);
myGraph.addEdges(3, 2);
myGraph.addEdges(4, 5);
}
public void testCreation1() {
assertEquals("0 -> 1, 2\n" +
"1 -> 3\n" +
"2 -> \n" +
"3 -> 2\n" +
"4 -> 5\n" +
"5 -> \n", myGraph.getGraph().toString());
}
public void testTranspose1() {
Graph transposed = getTransposed(myGraph.getGraph());
assertEquals("0 -> \n" +
"1 -> 0\n" +
"2 -> 0, 3\n" +
"3 -> 1\n" +
"4 -> \n" +
"5 -> 4\n", transposed.toString());
}
public void testStronglyConnectedComponents1() {
myGraph.addEdges(5, 0);
List<List<IntVertex>> components = Graphs.findStronglyConnectedComponents(myGraph.getGraph());
assertEquals(N, components.size());
assertEquals(1, components.get(0).size());
assertTrue(components.get(0).contains(new IntVertex(4)));
assertEquals(1, components.get(1).size());
assertTrue(components.get(1).contains(new IntVertex(5)));
assertEquals(1, components.get(2).size());
assertTrue(components.get(2).contains(new IntVertex(0)));
assertEquals(1, components.get(3).size());
assertTrue(components.get(3).contains(new IntVertex(1)));
assertEquals(1, components.get(4).size());
assertTrue(components.get(4).contains(new IntVertex(3)));
assertEquals(1, components.get(5).size());
assertTrue(components.get(5).contains(new IntVertex(2)));
}
public void testStronglyConnectedComponents2() {
myGraph.addEdges(5, 4);
myGraph.addEdges(4, 0);
myGraph.addEdges(2, 0);
List<List<Integer>> components = Graphs.findStronglyConnectedComponents(myGraph.getGraph());
assertEquals(2, components.size());
assertEquals(2, components.get(0).size());
assertEquals(N - 2, components.get(1).size());
assertTrue(components.get(0).contains(new IntVertex(5)));
assertTrue(components.get(0).contains(new IntVertex(4)));
assertTrue(components.get(1).contains(new IntVertex(0)));
assertTrue(components.get(1).contains(new IntVertex(1)));
assertTrue(components.get(1).contains(new IntVertex(2)));
assertTrue(components.get(1).contains(new IntVertex(3)));
}
public <V extends IVertex> Graph<VertexDecorator<V>> getTransposed(Graph<V> graph0) {
IVertex[] vertices = graph0.getData().toArray(new IVertex[graph0.getNVertexes()]);
int[][] graph = Graphs.graphToIntInt(vertices, false, false);
int[][] transposed = GraphUtil.transpose(graph);
Graph result = new Graph();
VertexDecorator<V>[] vertices_ = new VertexDecorator[vertices.length];
for(int i = 0; i < vertices.length; i++) {
vertices_[i] = new VertexDecorator<V>((V) vertices[i]);
result.add(vertices_[i]);
}
for(int i = 0; i < vertices.length; i++) {
for(int t : transposed[i]) {
vertices_[i].addNext(vertices_[t]);
}
}
return result;
}
public static class VertexDecorator<V extends IVertex> implements IVertex, Comparable<VertexDecorator<V>> {
private final V myVertex;
private final Set<VertexDecorator<V>> myNext = new LinkedHashSet<VertexDecorator<V>>();
public VertexDecorator(V vertex) {
myVertex = vertex;
}
private void addNext(VertexDecorator v) {
myNext.add(v);
}
public Set<VertexDecorator<V>> getNexts() {
return Collections.unmodifiableSet(myNext);
}
public V getVertex() {
return myVertex;
}
@Override
public String toString() {
return myVertex.toString();
}
public boolean equals(Object obj) {
if (obj instanceof VertexDecorator) {
return myVertex.equals(((VertexDecorator) obj).getVertex());
}
return false;
}
public int hashCode() {
return myVertex.hashCode();
}
public int compareTo(VertexDecorator<V> o) {
return ((Comparable<V>) myVertex).compareTo(o.getVertex());
}
}
}