// -------------------------------------------------------------
private void FindShortestPaths(
PathFinderFactory pathFinderFactory,
Vertex startVertex,
Vertex endVertex
)
{
PathFinder pathFinder = pathFinderFactory.CreatePathFinder(edges_A_B_and_B_C, GraphEdgesValidationDesired.YES);
IList <Path> shortestPaths = pathFinder.FindShortestPaths(startVertex, endVertex, maxNumberOfPaths);
}
//[Test]
//public void TestFindShortestPaths_Parrisha() {
// TestFindShortestPaths(
// new PathFinderFactoryParrisha()
// );
//}
public void TestFindShortestPaths(
PathFinderFactory pathFinderFactory
)
{
Edge edgeAB3 = CreateEdge(CreateVertex("A"), CreateVertex("B"), CreateWeight(3));
Edge edgeBC5 = CreateEdge(CreateVertex("B"), CreateVertex("C"), CreateWeight(5));
Edge edgeCD7 = CreateEdge(CreateVertex("C"), CreateVertex("D"), CreateWeight(7));
Edge edgeBD13 = CreateEdge(CreateVertex("B"), CreateVertex("D"), CreateWeight(13));
IList <Edge> edges = new List <Edge>();
edges.Add(edgeAB3);
edges.Add(edgeBC5);
edges.Add(edgeCD7);
edges.Add(edgeBD13);
// There are two ways from A to C in a Graph with the above edges:
// A - B - C- D , with weight 15 ( 3 + 5 + 7 )
// A - B - D , with weight 16 ( 3 + 13 )
PathFinder pathFinder = pathFinderFactory.CreatePathFinder(
edges,
GraphEdgesValidationDesired.YES // TODO: refactor the construction of edges to able to do the validation only once instead of doing it for each factory
);
IList <Path> shortestPaths = pathFinder.FindShortestPaths(CreateVertex("A"), CreateVertex("D"), 5); // max 5 but actually we should only find 2
Assert.AreEqual(2, shortestPaths.Count);
Path path = shortestPaths[0]; // the shortest mentioned above with total weight 15
Assert.AreEqual(15, path.TotalWeightForPath.WeightValue, SMALL_DELTA_VALUE_FOR_WEIGHT_COMPARISONS);
IList <Edge> edgesForPath = path.EdgesForPath;
Assert.AreEqual(3, edgesForPath.Count);
assertEqualsAndTheSameInstance(edgeAB3, edgesForPath[0]);
assertEqualsAndTheSameInstance(edgeBC5, edgesForPath[1]);
assertEqualsAndTheSameInstance(edgeCD7, edgesForPath[2]);
//
//
Path path2 = shortestPaths[1];
Assert.AreEqual(16, path2.TotalWeightForPath.WeightValue, SMALL_DELTA_VALUE_FOR_WEIGHT_COMPARISONS);
IList <Edge> edgesForPath2 = path2.EdgesForPath;
Assert.AreEqual(2, edgesForPath2.Count);
assertEqualsAndTheSameInstance(edgeAB3, edgesForPath2[0]);
assertEqualsAndTheSameInstance(edgeBD13, edgesForPath2[1]);
}
private void PathFinderTest(PathFinderFactory pathFinderFactory)
{
pathFinder = pathFinderFactory.CreatePathFinder(graph);
IList <Path> shortestPaths = pathFinder.FindShortestPaths(a, d, 10);
AreEqual(3, shortestPaths.Count);
// path1 : A -> B -> D (with total weight 13)
assertPath(shortestPaths[0], 13, "A", "B", "D");
// path2 : A -> C -> D (with total weight 15)
assertPath(shortestPaths[1], 15, "A", "C", "D");
// path3 : A -> B -> C -> D (with total weight 21)
assertPath(shortestPaths[2], 21, "A", "B", "C", "D");
}
private void VerifyExpectedPaths(
Vertex startVertex,
Vertex endVertex,
IList <Edge> edges,
PathFinderFactory pathFinderFactory,
ExpectedPath[] expectedShortestPaths
)
{
PathFinder pathFinder = pathFinderFactory.CreatePathFinder(
edges,
GraphEdgesValidationDesired.NO // do the validation one time instead of doing it for each pathFinderFactory
);
IList <Path> actualShortestPaths = pathFinder.FindShortestPaths(startVertex, endVertex, 10);
Assert.AreEqual(expectedShortestPaths.Length, actualShortestPaths.Count);
string errorContext = pathFinderFactory.GetType().Name;
for (int i = 0; i < expectedShortestPaths.Length; i++)
{
errorContext += " , i: " + i;
ExpectedPath expectedPath = expectedShortestPaths[i];
Path actualPath = actualShortestPaths[i];
Assert.AreEqual(expectedPath.totalWeight, actualPath.TotalWeightForPath.WeightValue, SMALL_DELTA_VALUE_FOR_WEIGHT_COMPARISONS, errorContext);
ExpectedEdge[] expectedEdgesForPath = expectedPath.expectedEdges;
IList <Edge> actualEdgesForPath = actualPath.EdgesForPath;
Assert.AreEqual(expectedEdgesForPath.Length, actualEdgesForPath.Count, errorContext);
for (int j = 0; j < expectedEdgesForPath.Length; j++)
{
errorContext += " , j=" + j;
ExpectedEdge expectedEdge = expectedEdgesForPath[j];
Edge actualEdge = actualEdgesForPath[j];
Assert.NotNull(actualEdge, errorContext);
Assert.NotNull(actualEdge.EdgeWeight, errorContext);
Assert.NotNull(actualEdge.StartVertex, errorContext);
Assert.NotNull(actualEdge.EndVertex, errorContext);
Assert.AreEqual(expectedEdge.weight, actualEdge.EdgeWeight.WeightValue, SMALL_DELTA_VALUE_FOR_WEIGHT_COMPARISONS, errorContext);
Assert.AreEqual(expectedEdge.startVertexId, actualEdge.StartVertex.VertexId, errorContext);
Assert.AreEqual(expectedEdge.endVertexId, actualEdge.EndVertex.VertexId, errorContext);
Assert.AreEqual(expectedEdge.edgeId, actualEdge.EdgeId, errorContext);
}
}
}
private void shouldThrowExceptionIfAnyOfTheVerticesIsNotPartOfTheGraph(
PathFinderFactory pathFinderFactory,
Vertex startVertex,
Vertex endVertex,
bool isExceptionExpected
)
{
if (isExceptionExpected)
{
Assert.Throws <GraphValidationException>(() => {
FindShortestPaths(pathFinderFactory, startVertex, endVertex);
});
//ActualValueDelegate<object> testDelegate = () => FindShortestPaths(pathFinderFactory, startVertex, endVertex);
//Assert.That( () => {
// FindShortestPaths(pathFinderFactory, startVertex, endVertex);
//},
//Throws.TypeOf<GraphValidationException>
//);
}
else
{
FindShortestPaths(pathFinderFactory, startVertex, endVertex);
}
}
public static void RunAntQuest(JsonTypes jsonWorker, PathAlgorithms pathAlgorithm, bool DEBUG, string url = "")
{
try
{
var sw = new Stopwatch();
sw.Start();
Console.WriteLine("Running ANT QUEST for {0} and {1}", jsonWorker, pathAlgorithm);
AntModel antModel = JsonSimpleFactory.GetJsonData(jsonWorker, url);
if (DEBUG)
{
Console.WriteLine("Obtaining data took: {0} ms", sw.Elapsed.Milliseconds);
}
sw.Restart();
var antGraph = new Graph(antModel);
if (DEBUG)
{
Console.WriteLine("Graph preparation took: {0} ms", sw.Elapsed.Milliseconds);
}
sw.Restart();
var pathFinder = PathFinderFactory.PathFactory(antGraph, pathAlgorithm);
var path = pathFinder.FindPath();
var pathString = pathFinder.GetPathSimpleString(path);
if (DEBUG)
{
Console.WriteLine("Path finding took: {0} ms", sw.Elapsed.Milliseconds);
}
if (DEBUG)
{
Console.WriteLine("Final path is: {0}", pathString);
}
sw.Restart();
if (jsonWorker == JsonTypes.TEST || jsonWorker == JsonTypes.URL || jsonWorker == JsonTypes.API_QUADIENT)
{
var serverResponse =
JsonSimpleFactory.SendJsonResponse(jsonWorker, antGraph.ID, pathString, url);
Console.WriteLine(serverResponse.Message);
if (serverResponse.Valid && serverResponse.InTime && DEBUG)
{
Console.WriteLine("Test passed");
}
else if (DEBUG)
{
Console.WriteLine("Test failed");
}
}
if (DEBUG)
{
Console.WriteLine("Sending data took: {0} ms", sw.Elapsed.Milliseconds);
}
sw.Stop();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
/**
* Overloaded method. Note that the last parameter can be null if we only want to compare
* results from different implementations.
* The second last parameter is used when we also have an expected path retrieved for example from an xml file.
* The last parameter can be used temporarirly for "debugging" purposes when we want to display the results to the console
* See comment at class level.
*/
public void AssertExpectedResultsOrAssertImplementationsWithEachOther(
IList <Edge> edgesForBigGraph,
Vertex startVertex,
Vertex endVertex,
int numberOfPathsToFind,
IList <PathFinderFactory> pathFinderFactoriesForImplementationsToTest,
IList <Path> expectedListOfPaths,
string optionalPathToResourceXmlFile,
bool shouldTestResultsWithImplementationsAgainstEachOther = false
)
{
// TODO: clean up this method e.g. regarding "shouldAlsoTestResultsWithImplementationsAgainstEachOther"
//this.SetConsoleOutputDesired(ConsoleOutputDesired.TIME_MEASURE);
string messagePrefixWithInformationAboutXmlSourcefileWithTestData = optionalPathToResourceXmlFile == null ? "" : "Xml file with test data: " + optionalPathToResourceXmlFile + " . ";
output("Number of edges in the graph to be tested : " + edgesForBigGraph.Count);
IDictionary <string, IList <Path> > shortestPathsPerImplementation = new Dictionary <string, IList <Path> >();
// the parameter GraphEdgesValidationDesired.NO will be used so therefore do the validation once externally here first
GraphEdgesValidator <Path, Edge, Vertex, Weight> .ValidateEdgesForGraphCreation <Path, Edge, Vertex, Weight>(edgesForBigGraph);
PathParser <Path, Edge, Vertex, Weight> pathParser = PathParser <Path, Edge, Vertex, Weight> .CreatePathParserDefault(edgesForBigGraph);
//assertThat("At least some implementation should be used", pathFinderFactoriesForImplementationsToTest.size(), greaterThanOrEqualTo(1));
// TODO: "hamcrest" syntax similar to above java code
Assert.That(pathFinderFactoriesForImplementationsToTest.Count >= 1, "At least some implementation should be used");
for (int i = 0; i < pathFinderFactoriesForImplementationsToTest.Count; i++)
{
PathFinderFactory pathFinderFactory = pathFinderFactoriesForImplementationsToTest[i];
output("Will now test file " + optionalPathToResourceXmlFile + " with impl " + pathFinderFactory.GetType().Name);
TimeMeasurer tm = TimeMeasurer.Start();
PathFinder pathFinder = pathFinderFactory.CreatePathFinder(
edgesForBigGraph,
GraphEdgesValidationDesired.NO // do the validation one time instead of doing it for each pathFinderFactory
);
IList <Path> shortestPaths = pathFinder.FindShortestPaths(startVertex, endVertex, numberOfPathsToFind);
Assert.IsNotNull(shortestPaths);
//assertThat("At least some path should be found", shortestPaths.size(), greaterThanOrEqualTo(1));
Assert.That(shortestPaths.Count >= 1, "At least some path should be found"); // TODO "hamcrest" syntax as java above
output(
messagePrefixWithInformationAboutXmlSourcefileWithTestData
+ "Seconds: " + tm.GetSeconds()
+ ". Implementation: " + pathFinder.GetType().Name,
ConsoleOutputDesired.TIME_MEASURE
);
if (isAllConsoleOutputDesired())
{
DisplayListOfShortestPath(shortestPaths);
output("Implementation class for above and below output: " + pathFinderFactory.GetType().Name);
DisplayAsPathStringsWhichCanBeUsedInXml(shortestPaths, pathParser);
}
shortestPathsPerImplementation.Add(pathFinder.GetType().Name, shortestPaths);
}
IList <string> nameOfImplementations = new List <string>(shortestPathsPerImplementation.Keys);
if (expectedListOfPaths != null)
{
AssertResultsWithExpectedPaths(
expectedListOfPaths,
optionalPathToResourceXmlFile,
shortestPathsPerImplementation
);
}
else // if(expectedListOfPaths != null) {
if (shouldTestResultsWithImplementationsAgainstEachOther)
{
AssertResultsWithImplementationsAgainstEachOther(
optionalPathToResourceXmlFile,
shortestPathsPerImplementation
);
}
}