completato binary tree e implementato euler tour astratto + una sua implementazione per computazione aritmetica

euler_tour/expressions/EvaluateExpressionTour.java

@@ -0,0 +1,30 @@
+package euler_tour.expressions;
+
+import euler_tour.EulerTour;
+import position.Position;
+import tree.binarytree.BinaryTree;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 27/04/2014
+ * Time: 13:09
+ */
+public class EvaluateExpressionTour extends EulerTour<ExpressionTerm,Integer> {
+
+    public Integer execute(BinaryTree<ExpressionTerm> T) {
+        init(T);
+        return eulerTour(tree.root());
+    }
+
+    protected void visitRight(Position<ExpressionTerm> v, TourResult<Integer> r) {
+        ExpressionTerm term = v.element();
+        if (tree.isInternal(v)) {
+            ExpressionOperator op = (ExpressionOperator) term;
+            op.setOperands(r.left, r.right);
+        }
+        r.out = term.getValue();
+    }
+}
+
+