Commiting for a review

ee3_common/com/pahimar/ee3/emc/graph/WeightedDirectedGraph.java

@@ -1,17 +1,47 @@
 package com.pahimar.ee3.emc.graph;
 
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.NoSuchElementException;
 import java.util.SortedSet;
-
+import java.util.TreeSet;
 
 public class WeightedDirectedGraph<T, E> implements Iterable<T> {
 
     private final Map<T, SortedSet<E>> graph = new HashMap<T, SortedSet<E>>();
     private List<T> orderedNodes = new ArrayList<T>();
+
+    public boolean addNode(T node)
+    {
+        // Ignore nodes already added
+        if (graph.containsKey(node)) {
+            return false;
+        }
+
+        orderedNodes.add(node);
+        graph.put(node, new TreeSet<E>(new Comparator<E>()
+        {
+            public int compare(E o1, E o2) {
+                return orderedNodes.indexOf(o1)-orderedNodes.indexOf(o2);
+            }
+        }));
+        
+        return true;
+    }
+    
+    public void addEdge(T from, T to)
+    {
+        if (!(graph.containsKey(from) && graph.containsKey(to)))
+        {
+            throw new NoSuchElementException("Missing nodes from graph");
+        }
+
+        //graph.get(from).add((E) to);
+    }
     
     @Override
     public Iterator<T> iterator() {