From 369b12ee76533d81fca920ca538a3639888a1e39 Mon Sep 17 00:00:00 2001
From: Brendan Saint-Germes <saint-germes@insa-toulouse.fr>
Date: Mon, 11 May 2026 12:00:05 +0200
Subject: [PATCH] =?UTF-8?q?ajout:=20Impl=C3=A9mentation=20de=20l'algorithm?=
 =?UTF-8?q?e=20de=20Dijkstra?=
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---
 .../shortestpath/DijkstraAlgorithm.java       | 91 +++++++++++++++++--
 .../graphs/algorithm/shortestpath/Label.java  | 52 +++++++++++
 .../graphs/algorithm/utils/BinaryHeap.java    |  2 -
 .../org/insa/graphs/gui/simple/Launch.java    |  4 +-
 4 files changed, 139 insertions(+), 10 deletions(-)
 create mode 100644 be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java

diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
index 18a540f..68b8e1b 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
@@ -1,5 +1,17 @@
 package org.insa.graphs.algorithm.shortestpath;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+import org.insa.graphs.algorithm.AbstractSolution.Status;
+import org.insa.graphs.algorithm.utils.BinaryHeap;
+import org.insa.graphs.algorithm.utils.ElementNotFoundException;
+import org.insa.graphs.model.Arc;
+import org.insa.graphs.model.Node;
+import org.insa.graphs.model.Path;
+
+
 public class DijkstraAlgorithm extends ShortestPathAlgorithm {
 
     public DijkstraAlgorithm(ShortestPathData data) {
@@ -8,17 +20,84 @@ public class DijkstraAlgorithm extends ShortestPathAlgorithm {
 
     @Override
     protected ShortestPathSolution doRun() {
-
-        // retrieve data from the input problem (getInputData() is inherited from the
-        // parent class ShortestPathAlgorithm)
         final ShortestPathData data = getInputData();
 
-        // variable that will contain the solution of the shortest path problem
+
+        System.out.println("==> Initialisation du tas binaire");
+        final HashMap<Integer, Label> labels = new HashMap<>(); // clé-valeur pour retrouver le label associé à un noeud à partir de son id
+        final BinaryHeap<Label> heap = new BinaryHeap<>(); // tas binaire pour retrouver le min en temps constant
+        final Label label = new Label(data.getOrigin(), null, 0.0, false);
+        heap.insert(label);
+        labels.put(data.getOrigin().getId(), label);
+        System.out.println("==> Tas initialisté");
+        //System.out.println(heap.toStringTree());
+
+        System.out.println("==> Dijkstra commence");
+        notifyOriginProcessed(data.getOrigin());
+        Label currentLabel = null;
+        boolean destinationReached = false;
+        while (!destinationReached && !heap.isEmpty() && (currentLabel=heap.deleteMin()) != null) {
+            if (currentLabel.getCoutRealise() == Double.MAX_VALUE)
+                break;
+
+            currentLabel.setMarque(true);
+            notifyNodeMarked(currentLabel.getNode());
+
+            // Si on atteint notre destination, on arrête l'algo
+            if (currentLabel.getNode().equals(data.getDestination())) {
+                destinationReached = true;
+            } else {
+                for (Arc arc : currentLabel.getNode().getSuccessors()) {
+                    if (data.isAllowed(arc)) {
+                        Label successorLabel = labels.get(arc.getDestination().getId());
+                        if (successorLabel == null) successorLabel = new Label(arc.getDestination());
+                        if (successorLabel.getCoutRealise() > currentLabel.getCoutRealise() + data.getCost(arc)) {
+                            try {
+                                heap.remove(successorLabel);
+                            } catch(ElementNotFoundException e) {
+                                // BinaryHeap#remove a échoué, donc ça veut dire qu'on doit juste insérer, pas mettre à jour, mais ça ne change rien au niveau du code
+                            }
+
+
+                            successorLabel.setCoutRealise(currentLabel.getCoutRealise() + data.getCost(arc));
+                            successorLabel.setArc(arc);
+                            heap.insert(successorLabel);
+                            labels.put(arc.getDestination().getId(), successorLabel);
+
+                            notifyNodeReached(arc.getDestination());
+                        }
+                    }
+                }
+            }
+        }
+
         ShortestPathSolution solution = null;
+        if (destinationReached) {
+            notifyDestinationReached(data.getDestination());
+            System.out.println("==> Dijkstra termine et a trouvé");
 
-        // TODO: implement the Dijkstra algorithm
+            // On part de la fin, et on remonte petit à petit vers le sommet d'origine
+            System.out.println("==> On recompose le chemin");
+            
+            List<Arc> arcs = new ArrayList<>();Node currentNode = data.getDestination();
+            while(currentNode != data.getOrigin()) {
+                final Arc arc = labels.get(currentNode.getId()).getArc();
+                if (arc != null) {
+                    arcs.add(arc);
+                    currentNode = arc.getOrigin();
+                } else {
+                    break;
+                }
+            }
+            System.out.println("==> Fini");
+
+            Path path = new Path(data.getGraph(), arcs.reversed());
+            solution = new ShortestPathSolution(data, Status.OPTIMAL, path);
+        } else {
+            System.out.println("==> Dijkstra termine mais n'a pas trouvé");
+            solution = new ShortestPathSolution(data, Status.INFEASIBLE);
+        }
 
-        // when the algorithm terminates, return the solution that has been found
         return solution;
     }
 
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
new file mode 100644
index 0000000..d04bcdc
--- /dev/null
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
@@ -0,0 +1,52 @@
+package org.insa.graphs.algorithm.shortestpath;
+
+import org.insa.graphs.model.Arc;
+import org.insa.graphs.model.Node;
+import java.lang.Comparable;
+
+public class Label implements Comparable<Label> {
+    private Node node;
+    private Arc arc;
+    private Double coutRealise;
+    private boolean marque;
+
+    public Label(Node node) {
+        this.node = node;
+        this.arc = null;
+        this.coutRealise = Double.MAX_VALUE;
+        this.marque = false;
+    }
+    public Label(Node node, Arc arc, Double coutRealise, boolean marque){
+        this.node = node;
+        this.arc = arc;
+        this.coutRealise = coutRealise;
+        this.marque = marque;
+    }
+
+    public Double getCoutRealise() { return this.coutRealise; }
+    public Node getNode() { return this.node; }
+    public Arc getArc() { return this.arc; }
+    public boolean getMarque() { return this.marque; }
+
+    public void setCoutRealise(Double cout) { this.coutRealise = cout; }
+    public void setArc(Arc arc) { this.arc = arc; }
+    public void setMarque(boolean marque) { this.marque = marque; }
+
+    //public Double getCost() {
+    //    return this.coutRealise;
+    //}
+
+    @Override
+    public int compareTo(Label l) {      
+        // si deux nodes ont le même coût, on prend celui à l'id le plus petit
+        if (this.getCoutRealise().compareTo(l.getCoutRealise()) == 0)
+            return ((Integer) this.getNode().getId()).compareTo((Integer) l.getNode().getId());
+        else
+            return this.getCoutRealise().compareTo(l.getCoutRealise());
+    }
+
+    @Override
+    public String toString() {
+        return "Label(Node=" + this.node.getId() + "; Coût=" + this.coutRealise + "; Marque=" + (this.marque ? "OUI" : "NON") + ") [" + this.hashCode() + "]";
+    }
+}
\ No newline at end of file
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/utils/BinaryHeap.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/utils/BinaryHeap.java
index 707d605..a7c60bc 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/utils/BinaryHeap.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/utils/BinaryHeap.java
@@ -1,8 +1,6 @@
 package org.insa.graphs.algorithm.utils;
 
-import java.util.ArrayDeque;
 import java.util.ArrayList;
-import java.util.Queue;
 import java.util.Stack;
 
 /**
diff --git a/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java b/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java
index 2037c7c..660d0bb 100644
--- a/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java
+++ b/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java
@@ -64,8 +64,8 @@ public class Launch {
 
     public static void main(String[] args) throws Exception {
         // Pour mapName: un fichier .mapgr pour un graphe simple, un fichier .mapfg pour une carte (le .mapgr associé doit être présent dans le même dossier)
-        final String mapName = "C:\\Users\\Brendan\\Mon Drive\\INSA\\3MIC\\S6 - Graphes\\BE-Graphes\\Maps\\insa.mapfg";
-        final String pathName = "C:\\Users\\Brendan\\Mon Drive\\INSA\\3MIC\\S6 - Graphes\\BE-Graphes\\Paths\\path_fr31insa_rangueil_r2.path";
+        final String mapName = "/mnt/commetud/3eme Annee MIC/Graphes-et-Algorithmes/Maps/midi-pyrenees.mapgr";
+        final String pathName = "/mnt/commetud/3eme Annee MIC/Graphes-et-Algorithmes/Paths/path_fr31insa_rangueil_r2.path";
 
         final Graph graph;
         final Path path;