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Add getNodes() and getSuccessors() methods and remove iterable from Graph and Node.

Mikaël Capelle 5 years ago
parent
commit
d8470055f1

+ 84
- 83
src/main/org/insa/algo/shortestpath/BellmanFordAlgorithm.java View File

@@ -12,88 +12,89 @@ import org.insa.graph.Path;
12 12
 
13 13
 public class BellmanFordAlgorithm extends ShortestPathAlgorithm {
14 14
 
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-	public BellmanFordAlgorithm(ShortestPathData data) {
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-		super(data);
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-	}
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-
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-	@Override
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-	protected ShortestPathSolution doRun() {
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-
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-		// Retrieve the graph.
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-		ShortestPathData data = getInputData();
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-		Graph graph = data.getGraph();
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-
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-		final int nbNodes = graph.size();
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-
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-		// Initialize array of distances.
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-		double[] distances = new double[nbNodes];
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-		Arrays.fill(distances, Double.POSITIVE_INFINITY);
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-		distances[data.getOrigin().getId()] = 0;
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-
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-		// Notify observers about the first event (origin processed).
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-		notifyOriginProcessed(data.getOrigin());
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-
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-		// Initialize array of predecessors.
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-		Arc[] predecessorArcs = new Arc[nbNodes];
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-
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-		// Actual algorithm, we will assume the graph does not contain negative
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-		// cycle...
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-		boolean found = false;
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-		for (int i = 0; !found && i < nbNodes; ++i) {
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-			found = true;
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-			for (Node node : graph) {
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-				for (Arc arc : node) {
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-
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-					// Small test to check allowed roads...
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-					if (!data.isAllowed(arc)) {
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-						continue;
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-					}
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-
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-					// Retrieve weight of the arc.
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-					double w = data.getCost(arc);
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-					double oldDistance = distances[arc.getDestination().getId()];
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-					double newDistance = distances[node.getId()] + w;
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-
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-					if (Double.isInfinite(oldDistance) && Double.isFinite(newDistance)) {
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-						notifyNodeReached(arc.getDestination());
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-					}
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-
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-					// Check if new distances would be better, if so update...
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-					if (newDistance < oldDistance) {
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-						found = false;
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-						distances[arc.getDestination().getId()] = distances[node.getId()] + w;
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-						predecessorArcs[arc.getDestination().getId()] = arc;
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-					}
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-				}
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-			}
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-		}
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-
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-		ShortestPathSolution solution = null;
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-
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-		// Destination has no predecessor, the solution is infeasible...
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-		if (predecessorArcs[data.getDestination().getId()] == null) {
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-			solution = new ShortestPathSolution(data, Status.INFEASIBLE);
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-		} else {
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-
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-			// The destination has been found, notify the observers.
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-			notifyDestinationReached(data.getDestination());
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-
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-			// Create the path from the array of predecessors...
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-			ArrayList<Arc> arcs = new ArrayList<>();
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-			Arc arc = predecessorArcs[data.getDestination().getId()];
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-			while (arc != null) {
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-				arcs.add(arc);
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-				arc = predecessorArcs[arc.getOrigin().getId()];
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-			}
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-
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-			// Reverse the path...
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-			Collections.reverse(arcs);
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-
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-			// Create the final solution.
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-			solution = new ShortestPathSolution(data, Status.OPTIMAL, new Path(graph, arcs));
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-		}
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-
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-		return solution;
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-	}
15
+    public BellmanFordAlgorithm(ShortestPathData data) {
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+        super(data);
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+    }
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+
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+    @Override
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+    protected ShortestPathSolution doRun() {
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+
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+        // Retrieve the graph.
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+        ShortestPathData data = getInputData();
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+        Graph graph = data.getGraph();
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+
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+        final int nbNodes = graph.size();
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+
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+        // Initialize array of distances.
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+        double[] distances = new double[nbNodes];
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+        Arrays.fill(distances, Double.POSITIVE_INFINITY);
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+        distances[data.getOrigin().getId()] = 0;
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+
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+        // Notify observers about the first event (origin processed).
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+        notifyOriginProcessed(data.getOrigin());
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+
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+        // Initialize array of predecessors.
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+        Arc[] predecessorArcs = new Arc[nbNodes];
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+
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+        // Actual algorithm, we will assume the graph does not contain negative
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+        // cycle...
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+        boolean found = false;
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+        for (int i = 0; !found && i < nbNodes; ++i) {
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+            found = true;
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+            for (Node node: graph.getNodes()) {
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+                for (Arc arc: node.getSuccessors()) {
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+
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+                    // Small test to check allowed roads...
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+                    if (!data.isAllowed(arc)) {
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+                        continue;
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+                    }
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+
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+                    // Retrieve weight of the arc.
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+                    double w = data.getCost(arc);
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+                    double oldDistance = distances[arc.getDestination().getId()];
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+                    double newDistance = distances[node.getId()] + w;
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+
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+                    if (Double.isInfinite(oldDistance) && Double.isFinite(newDistance)) {
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+                        notifyNodeReached(arc.getDestination());
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+                    }
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+
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+                    // Check if new distances would be better, if so update...
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+                    if (newDistance < oldDistance) {
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+                        found = false;
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+                        distances[arc.getDestination().getId()] = distances[node.getId()] + w;
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+                        predecessorArcs[arc.getDestination().getId()] = arc;
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+                    }
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+                }
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+            }
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+        }
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+
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+        ShortestPathSolution solution = null;
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+
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+        // Destination has no predecessor, the solution is infeasible...
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+        if (predecessorArcs[data.getDestination().getId()] == null) {
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+            solution = new ShortestPathSolution(data, Status.INFEASIBLE);
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+        }
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+        else {
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+
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+            // The destination has been found, notify the observers.
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+            notifyDestinationReached(data.getDestination());
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+
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+            // Create the path from the array of predecessors...
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+            ArrayList<Arc> arcs = new ArrayList<>();
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+            Arc arc = predecessorArcs[data.getDestination().getId()];
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+            while (arc != null) {
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+                arcs.add(arc);
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+                arc = predecessorArcs[arc.getOrigin().getId()];
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+            }
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+
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+            // Reverse the path...
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+            Collections.reverse(arcs);
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+
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+            // Create the final solution.
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+            solution = new ShortestPathSolution(data, Status.OPTIMAL, new Path(graph, arcs));
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+        }
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+
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+        return solution;
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+    }
98 99
 
99 100
 }

+ 2
- 2
src/main/org/insa/algo/weakconnectivity/WeaklyConnectedComponentsAlgorithm.java View File

@@ -77,8 +77,8 @@ public class WeaklyConnectedComponentsAlgorithm
77 77
             res.add(new HashSet<Integer>());
78 78
         }
79 79
 
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-        for (Node node: getInputData().getGraph()) {
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-            for (Arc arc: node) {
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+        for (Node node: getInputData().getGraph().getNodes()) {
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+            for (Arc arc: node.getSuccessors()) {
82 82
                 res.get(node.getId()).add(arc.getDestination().getId());
83 83
                 if (arc.getRoadInformation().isOneWay()) {
84 84
                     res.get(arc.getDestination().getId()).add(node.getId());

+ 9
- 6
src/main/org/insa/graph/Graph.java View File

@@ -2,7 +2,6 @@ package org.insa.graph;
2 2
 
3 3
 import java.util.ArrayList;
4 4
 import java.util.Collections;
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-import java.util.Iterator;
6 5
 import java.util.List;
7 6
 
8 7
 /**
@@ -12,7 +11,7 @@ import java.util.List;
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  * holds a list of nodes and each node holds a list of its successors.
13 12
  *
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  */
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-public final class Graph implements Iterable<Node> {
14
+public final class Graph {
16 15
 
17 16
     // Map identifier.
18 17
     private final String mapId;
@@ -68,9 +67,13 @@ public final class Graph implements Iterable<Node> {
68 67
         return this.nodes.size();
69 68
     }
70 69
 
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-    @Override
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-    public Iterator<Node> iterator() {
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-        return this.nodes.iterator();
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+    /**
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+     * @return List of nodes in this graph (unmodifiable).
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+     * 
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+     * @see Collections#unmodifiableList(List)
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+     */
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+    public List<Node> getNodes() {
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+        return this.nodes;
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     }
75 78
 
76 79
     /**
@@ -97,7 +100,7 @@ public final class Graph implements Iterable<Node> {
97 100
         }
98 101
         for (Node node: nodes) {
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             Node orig = trNodes.get(node.getId());
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-            for (Arc arc: node) {
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+            for (Arc arc: node.getSuccessors()) {
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                 if (arc.getRoadInformation().isOneWay()) {
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                     Node dest = trNodes.get(arc.getDestination().getId());
103 106
                     dest.addSuccessor(new ArcBackward(new ArcForward(orig, dest, arc.getLength(),

+ 9
- 5
src/main/org/insa/graph/Node.java View File

@@ -2,7 +2,7 @@ package org.insa.graph;
2 2
 
3 3
 import java.util.ArrayList;
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 import java.util.Collections;
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-import java.util.Iterator;
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+import java.util.List;
6 6
 
7 7
 /**
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  * Class representing a Node in a {@link Graph}.
@@ -13,7 +13,7 @@ import java.util.Iterator;
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  * Nodes are comparable based on their ID.
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  *
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  */
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-public final class Node implements Comparable<Node>, Iterable<Arc> {
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+public final class Node implements Comparable<Node> {
17 17
 
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     /**
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      * Link the two given nodes with one or two arcs (depending on roadInformation),
@@ -107,9 +107,13 @@ public final class Node implements Comparable<Node>, Iterable<Arc> {
107 107
         return !this.successors.isEmpty();
108 108
     }
109 109
 
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-    @Override
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-    public Iterator<Arc> iterator() {
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-        return Collections.unmodifiableList(this.successors).iterator();
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+    /**
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+     * @return List of successors of this node (unmodifiable list).
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+     * 
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+     * @see Collections#unmodifiableList(List)
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+     */
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+    public List<Arc> getSuccessors() {
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+        return Collections.unmodifiableList(this.successors);
113 117
     }
114 118
 
115 119
     /**

+ 1
- 1
src/main/org/insa/graphics/NodesInputPanel.java View File

@@ -65,7 +65,7 @@ public class NodesInputPanel extends JPanel
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         public Node findClosestNode(Point point) {
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             Node minNode = null;
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             double minDis = Double.POSITIVE_INFINITY;
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-            for (Node node: graph) {
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+            for (Node node: graph.getNodes()) {
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                 double dlon = point.getLongitude() - node.getPoint().getLongitude();
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                 double dlat = point.getLatitude() - node.getPoint().getLatitude();
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                 double dis = dlon * dlon + dlat * dlat; // No need to square

+ 2
- 2
src/main/org/insa/graphics/drawing/components/BasicDrawing.java View File

@@ -679,8 +679,8 @@ public class BasicDrawing extends JPanel implements Drawing {
679 679
         this.removeMouseMotionListener(zoomAndPanListener);
680 680
         this.removeMouseWheelListener(zoomAndPanListener);
681 681
 
682
-        for (Node node: graph) {
683
-            for (Arc arc: node) {
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+        for (Node node: graph.getNodes()) {
683
+            for (Arc arc: node.getSuccessors()) {
684 684
                 // Draw arcs only if there are one-way arcs or if origin is lower than
685 685
                 // destination, avoid drawing two-ways arc twice.
686 686
                 if (arc.getRoadInformation().isOneWay()

+ 1
- 1
src/test/org/insa/graph/GraphTest.java View File

@@ -62,7 +62,7 @@ public class GraphTest {
62 62
      */
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     private List<Arc> getArcsBetween(Node a, Node b) {
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         List<Arc> arcs = new ArrayList<>();
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-        for (Arc arc: a) {
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+        for (Arc arc: a.getSuccessors()) {
66 66
             if (arc.getDestination().equals(b)) {
67 67
                 arcs.add(arc);
68 68
             }

+ 1
- 1
src/test/org/insa/graph/NodeTest.java View File

@@ -54,7 +54,7 @@ public class NodeTest {
54 54
      * @return The first arc between from a to b, or null.
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      */
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     private Arc getFirstArcBetween(Node a, Node b) {
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-        for (Arc arc: a) {
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+        for (Arc arc: a.getSuccessors()) {
58 58
             if (arc.getDestination().equals(b)) {
59 59
                 return arc;
60 60
             }

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