Brouillon Dijkstra
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2 changed files with 38 additions and 16 deletions
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@ -1,7 +1,10 @@
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package org.insa.graphs.algorithm.shortestpath;
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import org.insa.graphs.algorithm.utils.BinaryHeap;
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public class DijkstraAlgorithm extends ShortestPathAlgorithm {
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public DijkstraAlgorithm(ShortestPathData data) {
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super(data);
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}
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@ -11,6 +14,38 @@ public class DijkstraAlgorithm extends ShortestPathAlgorithm {
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final ShortestPathData data = getInputData();
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ShortestPathSolution solution = null;
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// TODO:
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//initialisation
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BinaryHeap tas=new BinaryHeap();
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Label[] tablabel=new Label[data.getGraph().size()];
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for (int i=0;i<tablabel.length;i++) {
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tablabel[i]=new Label(data.getGraph().get(i),null,Integer.MAX_VALUE);
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}
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tablabel[data.getOrigin().getId()].cout=0;
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tas.insert(data.getOrigin().getId());
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boolean exnonmar=true;
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int min;
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//itérations
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while (exnonmar) {
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min=tas.deleteMin();
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tablabel[min].marque=true;
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for (successeurs y) {
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if (!tablabel[y].marque) {
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if (tablabel[y].cout>tablabel[x].cout+(int)tablabel[y].pere.getMinimumTravelTime()) {
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tablabel[y].cout=tablabel[x].cout+(int)tablabel[y].pere.getMinimumTravelTime();
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if (exist y in tas) {
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tas.update(y);
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}else {
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tas.insert(y);
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}
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}
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}
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}
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exnonmar=false;
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}
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return solution;
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}
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@ -5,10 +5,6 @@ import org.insa.graphs.model.Node;
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public class Label {
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//comment avoir le nombre de nodes dans le graph? (pour lier un unique label à chaque node)
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private Label[] tablabel=new Label[50000000];//5000000 placeholder
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//quelles valeurs de protection?
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protected Node sommet_courant;
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@ -24,29 +20,20 @@ public class Label {
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//constructeur
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public Label(Node sommet,Arc padre, int prix) {
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if (tablabel[sommet.getId()]==null)
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this.sommet_courant=sommet;
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this.pere=padre;
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this.cout=prix;
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this.marque=false;//!\\ pas sûr que ce soit une bonne idée
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tablabel[sommet.getId()]=this;
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}
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//la condition tablabel==null est un placeholder /!\
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public Label(Node sommet,Arc padre, int prix, boolean mark) {
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if (tablabel[sommet.getId()]==null)
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this.sommet_courant=sommet;
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this.pere=padre;
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this.cout=prix;
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this.marque=mark;
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tablabel[sommet.getId()]=this;
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}
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public Label getLabel(Node unnode) {
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return tablabel[unnode.getId()];
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}
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public int getCost() {
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return this.cout;
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}
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