IndexListIterator che implementa Iterator mediante un array list. Implementazione di Iterator mediante cursore : ElementIterator per PositionList. Aggiunti alcuni metodi e spostato le classi IndexListIterator,ElementIterator nel package Iterator.

iterator/ElementIterator.java

@@ -0,0 +1,74 @@
+package iterator;
+
+import exceptions.BoundaryViolationException;
+import position.Position;
+import position.PositionList;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 06/04/2014
+ * Time: 21:06
+ */
+
+//iterator implementation with cursor for PositionList data structures.
+
+public class ElementIterator<E> implements Iterator<E> {
+
+    public ElementIterator (PositionList<E> structure){
+
+        new_structure = structure;
+
+    }
+
+    @Override
+    public boolean hasNext() {
+        if (pos == null){
+            if (new_structure. size() <= 0){
+                return false;
+            } else {
+                return true;
+            }
+
+        } else {
+
+            try {
+                new_structure.next(pos);
+                return true;
+            }
+            catch (BoundaryViolationException err){
+                return false;
+
+            }
+
+
+        }
+    }
+
+    @Override
+    public E next() throws NoSuchElementException {
+        if (hasNext()){
+            if (pos == null){
+                pos = new_structure.first();
+            }else {
+                pos = new_structure.next(pos);
+            }
+            return pos.element();
+        } else{
+            throw new NoSuchElementException();
+        }
+    }
+
+    @Override
+    public void remove() {
+        throw new UnsupportedOperationException ();
+    }
+
+    PositionList<E>  new_structure = null;
+    Position<E> pos = null;
+
+
+}

iterator/IndexListIterator.java

@@ -0,0 +1,55 @@
+package iterator;
+
+import arraylist.ArrayIndexList;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 06/04/2014
+ * Time: 21:13
+ */
+
+// generic iterator list creation using an arraylist. the class calling this metod should pass an array of E
+
+public class IndexListIterator<E> implements Iterator<E> {
+
+    public IndexListIterator (E[] in_elements){
+            for (int i = 0;i< in_elements.length;i++){
+                 data.add(i,in_elements[i]);
+            }
+    }
+
+    @Override
+    public boolean hasNext() {
+
+            if (pos <= data.size() -2){
+                return true;
+            }else {
+                return false;
+            }
+
+    }
+
+    @Override
+    public E next() throws NoSuchElementException {
+        if (hasNext()){
+             pos++;
+             return data.get(pos);
+        }else {
+            throw new NoSuchElementException();
+        }
+    }
+
+    @Override
+    public void remove() {
+        throw new UnsupportedOperationException ();
+    }
+
+    private ArrayIndexList<E> data = new ArrayIndexList<E>();
+    private int pos = -1;
+
+
+}