Migliroato positions e agiunto come metodo alla interfaccia position. Fixato alcuni bug. Aggiunto test della prova intercorso del 10/4/14. Bisogna implementare tree

sequence/ArraySequence.java

@@ -5,6 +5,7 @@ import exceptions.EmptyListException;
 import exceptions.EmptySequenceException;
 import exceptions.InvalidPositionException;
 import iterator.IndexListIterator;
+import iterator.IterablePositionIndexList;
 import position.Position;
 import sequence.utility.ArrayPosition;
 
@@ -298,4 +299,15 @@ public class ArraySequence<E> implements Sequence<E> {
         return new IndexListIterator<E>(temp);
 
     }
+
+    @Override
+    public Iterable<Position<E>> positions() {
+
+        Position<E>[] temp = new Position [this.size()];
+        for (int i = 0 ;i < this.size(); i++){
+            temp[i] = this.atIndex(i);
+        }
+        return new IterablePositionIndexList<E>(temp);
+
+    }
 }