@Override
public int checkFitness(
Graph<ColorableVertex, ?> graph,
List<ColorableVertex> gVertices,
Colony<ColorableVertex> colony) {
Collections.sort(
colony,
new Comparator<ColorableVertex>() {
@Override
public int compare(ColorableVertex o1, ColorableVertex o2) {
return o1.getId() - o2.getId();
}
});
for (int i = 0; i < gVertices.size(); i++) {
if (gVertices.get(i).getId() != colony.get(i).getId())
throw new IllegalStateException("DUPA");
gVertices.get(i).setColor(colony.get(i).getColor());
}
// Sprawdzenie czy rozwiązanie jest poprawne
int bad = 0;
for (ColorableVertex v : graph.getVertices()) {
for (ColorableVertex c : graph.getNeighbors(v)) {
if ((c.getColor() == v.getColor()) && (c != v)) bad++;
}
}
return bad;
}
private void getCandidateDomVerMap() throws ExceedLongMaxException {
candidateDomVerMap = new LinkedHashMap<String, List<Integer>>();
// the vertex cover's complement set will be an independent set
Collection<Integer> vertices = g.getVertices();
Collection<Integer> independentSet = CollectionUtils.subtract(vertices, vertexCover);
/*
* the vertex cover size will be the parameter k used in the fpt
* algorithm
*/
int vertexCoverSize = vertexCover.size();
byte[] comparedRuler = new byte[vertexCoverSize];
Arrays.fill(comparedRuler, AlgorithmUtil.MARKED);
for (Integer isv : independentSet) {
Collection<Integer> neighOfIsv = g.getNeighbors(isv);
byte ruler[] = new byte[vertexCoverSize];
// initilze the array with 0
Arrays.fill(ruler, AlgorithmUtil.UNMARKED);
for (Integer neig : neighOfIsv) {
/*
* the position of the dominate vertex in the vertex cover will
* set 1
*/
int pos = vertexCover.indexOf(neig);
if (pos != -1) {
ruler[pos] = AlgorithmUtil.MARKED;
}
}
// if (Arrays.equals(comparedRuler, ruler)) {
// log.debug(isv + " dominates all vc");
// }
String rulerStr = AlgorithmUtil.arrayToString(ruler);
List<Integer> candidateDomVerSet = candidateDomVerMap.get(rulerStr);
if (candidateDomVerSet == null) {
candidateDomVerSet = new ArrayList<Integer>();
}
// candidateDomVerSet.add(isv);
AlgorithmUtil.addElementToList(candidateDomVerSet, isv);
candidateDomVerMap.put(rulerStr, candidateDomVerSet);
}
/*
* because the vertices in the vertex cover can also dominate other
* vertices in the vertex cover,they are also considered
*/
for (Integer vcv : vertexCover) {
Collection<Integer> neighOfVcv = g.getNeighbors(vcv);
byte ruler[] = new byte[vertexCoverSize];
Arrays.fill(ruler, AlgorithmUtil.UNMARKED);
// the vertex can dominated by itself
int pos = vertexCover.indexOf(vcv);
ruler[pos] = AlgorithmUtil.MARKED;
for (Integer neig : neighOfVcv) {
/*
* the position of the dominate vertex in the vertex cover will
* set 1
*
* a neighbour of the vertex is likely not to be in the vertex
* cover
*/
pos = vertexCover.indexOf(neig);
if (pos != -1) {
ruler[pos] = AlgorithmUtil.MARKED;
}
}
// if (Arrays.equals(comparedRuler, ruler)) {
// log.debug(vcv + " dominates all vc");
// }
String rulerStr = AlgorithmUtil.arrayToString(ruler);
List<Integer> candidateDomVerSet = candidateDomVerMap.get(rulerStr);
if (candidateDomVerSet == null) {
candidateDomVerSet = new ArrayList<Integer>();
}
// candidateDomVerSet.add(vcv);
AlgorithmUtil.addElementToList(candidateDomVerSet, vcv);
candidateDomVerMap.put(rulerStr, candidateDomVerSet);
}
applySubsetRule(candidateDomVerMap);
}
/**
* Searches the graph and searches for the shortest path from a given start node to the
* destination. Returns {@code null} if there are no vertices, edges, or path to the goal,
* otherwise a list with the order of vertices on the shortest path.
*
* @param graph The graph to search
* @param source The vertex to start the search from
* @param destination The goal vertex
* @return A list with the order of vertices on the shortest path, null if no path exists in the
* graph.
*/
public List<V> search(Graph<V, E> graph, V source, V destination) {
// Check if it is even possible to find a path, return null
// if the graph has no vertices or edges
if (graph.getVertexCount() == 0) {
System.out.println("No nodes in the graph, " + "no shortest path can be found");
return null;
} else if (graph.getEdgeCount() == 0) {
System.out.println("No edges in graph, no path " + "can be found");
return null;
}
// Keep record of distance to each vertex, map each vertex
// in the graph to it's distance
HashMap<V, Number> distanceTable = new HashMap<>();
// Unvisited node queue, uses a pair <Vertex, Double> and ordered
// by the distance to the vertex
PriorityQueue<Pair<V, Number>> queue = new PriorityQueue<>(new QueueComparator());
// Map of nodes on the path, parents is value, key is child
HashMap<V, V> parent = new HashMap<>();
Number maxValue;
E edgeTest = graph.getEdges().iterator().next();
// This is so ugly, I hate Java Numbers
int numberType = 0;
if (edgeTest.getWeight() instanceof Integer) {
numberType = 1;
} else if (edgeTest.getWeight() instanceof Double) {
numberType = 2;
}
// Place each vertex in the map, initialize distances and put
// the pairings into the queue.
for (V vertex : graph.getVertices()) {
if (numberType == 1) {
maxValue = Integer.MAX_VALUE;
if (vertex.equals(source)) {
distanceTable.put(source, 0);
queue.add(new Pair<>(vertex, 0));
} else {
distanceTable.put(vertex, Integer.MAX_VALUE);
queue.add(new Pair<>(vertex, maxValue));
}
} else if (numberType == 2) {
maxValue = Double.MAX_VALUE;
if (vertex.equals(source)) {
distanceTable.put(source, 0.0);
queue.add(new Pair<>(vertex, 0.0));
} else {
distanceTable.put(vertex, Double.MAX_VALUE);
queue.add(new Pair<>(vertex, maxValue));
}
}
}
parent.put(source, null);
while (!queue.isEmpty()) {
Pair<V, Number> topPair = queue.remove();
V vertex = topPair.getLeft();
// Goal test, return the list of nodes on the path
// if we reach the destination
if (vertex.equals(destination)) {
return tracePath(parent, destination);
}
Collection<V> neighbours = graph.getNeighbors(vertex);
for (V neighbour : neighbours) {
E edge = graph.findEdge(vertex, neighbour);
assert (edge != null);
// Test for type of number used for weight, work accordingly
// Did I mention I hate the Java Number class.
if (numberType == 1) {
Integer alternateDistance = (Integer) edge.getWeight();
if (alternateDistance < (Integer) distanceTable.get(neighbour)) {
distanceTable.put(neighbour, alternateDistance);
parent.put(neighbour, vertex);
queue.add(new Pair<>(neighbour, alternateDistance));
}
} else if (numberType == 2) {
Double alternateDistance = (Double) edge.getWeight();
if (alternateDistance < (Double) distanceTable.get(neighbour)) {
distanceTable.put(neighbour, alternateDistance);
parent.put(neighbour, vertex);
queue.add(new Pair<>(neighbour, alternateDistance));
}
}
}
}
// Exhausted all possible paths from source, could not find a path
// to the goal.
return null;
}
