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diff --git a/src/TP6/Graph.java b/src/TP6/Graph.java
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+package TP6;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.LinkedList;
+
+/** This class implements a graph as an adjacency-list.<br>
+ *  The graph may be oriented or not and may store any information
+ *  on nodes and on edges using (key,value) principle where key is a String 
+ *  and value an Object.
+ *  Nodes N are retrieved using their <i>hashcode</i>.
+ *  <br> Use {@code GraphTest} class for testing it.
+ *  <br> Use {@code GraphIO} class for converting a graph into an array, an image, to be displayed in a Graphics...
+ *  <br> Use {@code GraphAlgorithms} class for using algorithms on this graph structure like shortestPath.
+ * 
+ * @author Dr. Denis Pallez<br>
+ * <a href="http://denispallez.i3s.unice.fr">http://denispallez.i3s.unice.fr</a>
+ * 
+ * @param <N> N represents the types of <i>N</i>odes. 
+ */
+public class Graph<N> {
+	// all information about a node is stored in nodeInfo inner class
+	// using (String, Object) principle.
+	// orientation of the graph
+	private boolean orientedGraph ;
+	// Integer represents the hashcode of node of the graph.
+	private LinkedHashMap<Integer, nodeInfo<N>> ladj ;
+	
+	// make disable constructor by default
+	private Graph() {}
+	
+	/**
+	 * Build an oriented or unoriented graph
+	 * @param oriented Orientation of all edges of the graph
+	 */
+	public Graph(boolean oriented) {
+		ladj = new LinkedHashMap<Integer, nodeInfo<N>>() ;
+		orientedGraph = oriented ;
+	}
+	
+	/** Build a graph from another graph {@code g}.<br>
+	 * Make a deep copy of any information contained
+	 * in the graph.
+	 * 
+	 * @param g the graph
+	 */
+	public Graph(Graph<N> g) {
+		orientedGraph=g.orientedGraph ;
+		for (Integer code1:g.ladj.keySet() ) {
+			N node1 = g.getNode(code1) ; 
+			addNode(node1) ;
+			// add all values on node 
+			for (String key:g.ladj.get(code1).getAttributesOnNode().keySet()) {
+				addAttributeOnNode(node1, key, g.getAttributeOnNode(node1, key)) ;
+			}
+			for (Integer code2:g.ladj.get(code1).edges.keySet()) {
+				// add all values contained on edge node1->node2
+				N node2 = g.getNode(code2) ;
+				for (String key:g.ladj.get(code1).getAttributesOnEdge(code2).keySet()) {
+					addAttributeOnEdge(node1, node2, key,g.ladj.get(code1).getAttributeOnEdge(code2, key)) ;
+				}
+			}
+		}
+	}
+	
+	/** Are edges oriented or not ?
+	 * 
+	 * @return a boolean representing whether all edges of the graph are oriented or not 
+	 */
+	public boolean isOriented() {
+		return orientedGraph;
+	}
+	
+	/** 
+	 * Get a number that should be unique in the graph.
+	 * Method is based on hashcode of {@code node}.
+	 * @param node
+	 * @return a unique number of the node in the graph
+	 */
+	private Integer getCode(N node) {
+		return node.hashCode() ;
+	}
+	
+	
+	/** 
+	 * Retrieve node in the graph using its {@code code}.<br>
+	 * @param code Integer representing the hashcode of the object.
+	 * @return an object of type N used when adding the node in the graph. 
+	 */
+	private N getNode(Integer code) {
+		if (ladj.containsKey(code)) {
+			return ladj.get(code).getNode() ;
+		}
+		else return null ;
+	}
+	
+	/** Is node {@code node} stored in the graph?
+	 */
+	public boolean isNode(N node) {
+		return ladj.containsKey(getCode(node)) ;
+	}
+
+	/** Add node {@code node} in the graph.
+	 * Use the hashcode of node as a key.
+	 * @param node node to add in the graph.
+	 */
+	public void addNode(N node) {
+		if (!isNode(node)) {
+			ladj.put(getCode(node), new nodeInfo<N>(node));
+		}
+	}
+	
+	/** Add information on node {@code node}.
+	 * 
+	 * @param node where information is stored
+	 * @param key a String value for retrieving the information
+	 * @param value information to store on the node associated to key
+	 */
+	public void addAttributeOnNode(N node, String key, Object value) {
+		Integer code = getCode(node) ; 
+		addNode(node) ;
+		ladj.get(code).addAttributeOnNode(key,value) ;
+	}
+	
+	/** Retrieve information called {@code key} on node {@code node}.
+	 * @param node the node where information is stored
+	 * @param key the key information to retrieve
+	 */
+	public Object getAttributeOnNode(N node, String key) {
+		return ladj.get(getCode(node)).getAttributeOnNode(key) ;
+	}
+	
+	public HashMap<String,Object> getAttributesOnNode(N node) {
+		return ladj.get(getCode(node)).properties ;
+	}
+	
+	/** Add an edge between nodes {@code node1} and {@code node2} 
+	 * with an information called {@code key}
+	 * and represented by {@code value}.<br> 
+	 * If {@code node1} or {@code node2} are not in the graph, 
+	 * nodes are automatically added.<br>
+	 * If graph is not oriented, add automatically an edge between {@code node2} and {@code node1}. 
+	 */
+	public void addAttributeOnEdge(N node1, N node2, String key, Object value) {
+		if (!isNode(node1)) {
+			addNode(node1) ;
+		}
+		if (!isNode(node2)) {
+			addNode(node2) ;
+		}
+		ladj.get(getCode(node1)).addAttributeOnEdge(getCode(node2),key,value) ;
+		if (!orientedGraph) {
+			ladj.get(getCode(node2)).addAttributeOnEdge(getCode(node1),key,value) ;
+		}
+	}
+	
+	/** Retrieve information called {@code key} on edge 
+	 * between nodes {@code node1} and {@code node2}. <br>
+	 * If edge does not exist, return null.
+	 * @param node1
+	 * @param node2
+	 * @param key
+	 */
+	public Object getAttributeOnEdge(N node1, N node2, String key) {
+		if (isNode(node1) && isNode(node2)) {
+			return ladj.get(getCode(node1)).getAttributeOnEdge(getCode(node2),key) ;
+		}
+		else return null ;
+	}
+	
+	public HashMap<String, Object> getAttributesOnEdge(N node1, N node2) {
+		if (isNode(node1) && isNode(node2)) {
+			return ladj.get(getCode(node1)).getAttributesOnEdge(getCode(node2)) ;
+		}
+		else return null ;
+	}
+	
+	/** Remove edge between nodes {@code node1} and {@code node2}. <br>
+	 * If graph is not oriented edge between nodes {@code node2} and {@code node1}
+	 * is also deleted.<br>
+	 * @param node1
+	 * @param node2
+	 */
+	public void deleteEdge(N node1, N node2) {
+		Integer code1 = getCode(node1) ;
+		Integer code2 = getCode(node2) ;
+		if (isNode(node1) && isNode(node2)) {
+			// remove edge node1->node2 
+			ladj.get(code1).clearAttributesOnEdge(code2); 
+			ladj.get(code1).edges.remove(code2) ;
+			if (!orientedGraph) {
+				// remove edge node2->node1
+				ladj.get(code2).clearAttributesOnEdge(code1); ladj.get(code1).edges.remove(code1) ;
+			}
+		}
+	}
+	
+	/** Remove node {@code node} and all incident edges.
+	 * @param node
+	 */
+	public void deleteNode(N node) {
+		Integer code = getCode(node) ;
+		if (ladj.containsKey(code)) {			
+			// delete node in succ list of any node of the graph
+			for (Integer anynode:ladj.keySet()) {
+				ladj.get(anynode).removeEdge(code) ;
+			}
+			// delete the node
+			ladj.remove(code) ;
+		}
+	}
+	
+	/** Remove information called {@code key} on all nodes and all edges of the graph.
+	 */
+	public void deleteAttributes(String key) {
+		for (Integer code1:ladj.keySet()) {
+			ladj.get(code1).removeAttributeOnNode(key) ;
+			for (Integer code2:ladj.get(code1).getEdges().keySet()) {
+				ladj.get(code1).removeAttributeOnEdge(code2,key) ;
+			}
+		}
+	}
+	
+	/** Is there an edge between nodes {@code node1} and {@code node2} 
+	 * considering any information stored in the graph ?
+	 */
+	public boolean hasEdge(N node1, N node2) {
+		Integer code1 = getCode(node1) ;
+		Integer code2 = getCode(node2) ;
+		if (ladj.containsKey(code1) && ladj.containsKey(code2)) {
+			return ladj.get(code1).getAttributesOnEdge(code2)!=null ;
+		}
+		else return false ;
+	}
+	
+	/** Is there an edge between nodes {@code node1} and {@code node2} 
+	 * considering {@code key} values ?
+	 */
+	public boolean hasEdge(N node1, N node2, String key) {
+		Integer code1 = getCode(node1) ;
+		Integer code2 = getCode(node2) ;
+		if (ladj.containsKey(code1) && ladj.containsKey(code2)) {
+			return ladj.get(code1).getAttributeOnEdge(code2, key)!=null ;
+		}
+		else return false ;
+	}
+	
+	/** return all descendants of node {@code node}.
+	 */
+	public LinkedList<N> getAdjacentNodes(N node) {
+		LinkedList<N> list= new LinkedList<N>() ;
+		for (Integer codedesc:ladj.get(getCode(node)).getEdges().keySet()) {
+			list.add(getNode(codedesc)) ;
+		}
+		return list ;
+	}
+	
+	/** return all descendants of node {@code node} according key .
+	 */
+	public LinkedList<N> getAdjacentNodes(N node, String key) {
+		LinkedList<N> list= new LinkedList<N>() ;
+		for (Integer codedesc:ladj.get(getCode(node)).getEdges().keySet()) {
+			if (getAttributeOnEdge(node, getNode(codedesc), key) != null)
+				list.add(getNode(codedesc)) ;
+		}
+		return list ;
+	}
+	
+	
+	/** return nodes that has a edge towards node {@code node}
+	 */
+	public LinkedList<N> getIncidenceNodes(N node) {
+		LinkedList<N> list = new LinkedList<N>() ;
+		for (Integer code2:ladj.keySet()) {
+			if (ladj.get(code2).getEdges().containsKey(getCode(node))) {
+				list.add(getNode(code2)) ;
+			}
+		}
+		return list ;
+	}
+	
+	/** return nodes that has a edge towards node {@code node}
+	 *  according to key {@code key}
+	 */
+	public LinkedList<N> getIncidenceNodes(N node, String key) {
+		LinkedList<N> list = new LinkedList<N>() ;
+		for (Integer code2:ladj.keySet()) {
+			if (ladj.get(code2).getAttributeOnEdge(getCode(node), key)!=null) {
+				list.add(getNode(code2)) ;
+			}
+		}
+		return list ;
+	}
+	
+	/** Return all nodes stored in the graph.
+	 */
+	public LinkedList<N> getNodes() {
+		LinkedList<N> list= new LinkedList<N>() ;
+		for (Integer code:ladj.keySet()) {
+			list.add(getNode(code)) ;
+		}
+		return list ;
+	}
+	
+	@Override
+	public String toString() {
+		String graphText ="" ;
+		for (Integer code1:ladj.keySet()) {
+			graphText+=getNode(code1)+"{";
+			for (String keynode:ladj.get(code1).getAttributesOnNode().keySet()) {
+				graphText+= "(" + keynode +"," + ladj.get(code1).getAttributeOnNode(keynode)+")," ;
+			}
+			graphText+="} :\t{" ;
+			for (Integer code2:ladj.get(code1).edges.keySet()) {
+				graphText+="->"+getNode(code2)+ladj.get(code1).getAttributesOnEdge(code2)+"," ;
+			}
+			graphText+="}\n" ;
+		}
+		return graphText ;
+	}
+	
+	// create a wrapper class for a node that will contain
+		// marks for that node and edges.
+		// A node can contain several informations represented 
+		// by a HashMap<String, Object>
+		// An edge can contain several informations represented 
+		// by a HashMap<String, Object>
+		private class nodeInfo<N> {
+			private N node ;
+			private HashMap<String,Object> properties ;
+			private LinkedHashMap<Integer,HashMap<String,Object>> edges ;
+			
+			private nodeInfo() {}
+			public nodeInfo(N value) {
+				properties = new HashMap<String, Object>() ;
+				//properties.put(privateKey, value) ;
+				node = value ;
+				edges = new LinkedHashMap<Integer,HashMap<String,Object>>() ;
+			}
+			
+			public N getNode() {
+				return node ;
+				//return (N)properties.get(privateKey) ;
+			}
+			
+			public Object getAttributeOnNode(String key) {
+				return properties.get(key) ;
+			}
+			
+			public HashMap<String,Object> getAttributesOnNode() {
+				return properties;
+			}
+			
+			public HashMap<Integer,HashMap<String,Object>> getEdges() {
+				return edges ;
+			}
+			
+			public void addAttributeOnNode(String key, Object value) {
+				properties.put(key, value) ;
+			}
+			
+			public void removeAttributeOnNode(String key) {
+				properties.remove(key) ;
+			}
+			
+			public Object getAttributeOnEdge(Integer code2, String key) {
+				if (edges.containsKey(code2))
+					return edges.get(code2).get(key) ;
+				else return null ;
+			}
+			
+			public HashMap<String, Object> getAttributesOnEdge(Integer code2) {
+				if (edges.containsKey(code2))
+					return edges.get(code2) ;
+				else return null ;
+			}
+			
+			public void addAttributeOnEdge(Integer code2, String key, Object value) {
+				if (!edges.containsKey(code2)) {
+					edges.put(code2, new HashMap<String,Object>()) ; 
+				}
+				edges.get(code2).put(key, value) ;
+			}
+			
+			public void removeAttributeOnEdge(Integer code2, String key) {
+				if (edges.containsKey(code2)) {
+					edges.get(code2).remove(key) ;
+				}
+			}
+			
+			public void removeEdge(Integer code2) {
+				if (edges.containsKey(code2)) {
+					edges.get(code2).clear() ;
+					edges.remove(code2) ;
+				}
+			}
+			
+			public void clearAttributesOnNode() {
+				properties.clear();
+			}
+			
+			public void clearAttributesOnEdge(Integer node2) {
+				if (edges.containsKey(node2))
+					edges.get(node2).clear();
+			}
+			public void clearAllAttributes() {
+				clearAttributesOnNode(); 
+				for (Integer node2:edges.keySet()) {
+					clearAttributesOnEdge(node2) ;
+				}
+			}
+		}	
+}