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.

arraylist/ArrayIndexList.java

@@ -1,5 +1,9 @@
 package arraylist;
 
+import iterator.IndexListIterator;
+
+import java.util.Iterator;
+
 /**
  * Created with xgiovio.macbookair.
  * User: xgiovio
@@ -93,4 +97,16 @@ package arraylist;
 
         return to_return;
     }
+
+    @Override
+    ///////////////// implemented used a generic IndexListIterator
+    public Iterator<E> iterator() {
+
+        E[] temp = (E[])new Object[this.size()];
+        for (int i = 0 ;i < this.size(); i++){
+            temp[i] = this.get(i);
+        }
+        return new IndexListIterator<E>(temp);
+
+    }
 }

arraylist/IndexList.java

@@ -8,7 +8,7 @@ package arraylist;
  */
 //Copyright (c) 2003 Brown University, Providence, RI
 //Additional modifications and methods by xgiovio
-public interface IndexList<E> {
+public interface IndexList<E> extends Iterable<E> {
 
 
     public E remove(int i) throws IndexOutOfBoundsException;

com/xgiovio/ArrayIndexListTest.java

@@ -6,6 +6,8 @@ import sequence.NodeSequence;
 import sequence.Sequence;
 import stack.NodeStack;
 
+import java.util.Iterator;
+
 /**
  * Created with xgiovio.macbookair.
  * User: xgiovio
@@ -27,6 +29,14 @@ public class ArrayIndexListTest {
         System.out.print(a);
 
 
+        Iterator<test_object> it = a.iterator();
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
 
 
 

com/xgiovio/ArraySequenceTest.java

@@ -4,6 +4,8 @@ import general_utility.test_object;
 import position.Position;
 import sequence.ArraySequence;
 
+import java.util.Iterator;
+
 /**
  * Created with xgiovio.macbookair.
  * User: xgiovio
@@ -22,6 +24,14 @@ public class ArraySequenceTest {
 
         System.out.print (a.indexOf( a.next( a.first())));
 
+        Iterator<test_object> it = a.iterator();
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+
+
 
     }
 

com/xgiovio/NodePositionListTest.java

@@ -32,11 +32,38 @@ public class NodePositionListTest {
         a.addLast(new Integer(4));
 
 
-        global.cancellaDuplicati(a);
 
 
         System.out.print(a);
 
+        Iterator<Integer> it = a.iterator();
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+        System.out.print(it.next());
+        System.out.print(it.hasNext());
+
+
 
 
 

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;
+
+
+}

position/NodePositionList.java

@@ -1,7 +1,7 @@
 package position;
 import  exceptions.*;
+import iterator.ElementIterator;
 import position.utility.DNode;
-import sun.org.mozilla.javascript.internal.ObjToIntMap;
 
 import java.util.Iterator;
 import java.util.NoSuchElementException;
@@ -192,75 +192,13 @@ public class NodePositionList<E> implements PositionList<E> {
 
 
     @Override
+    // iterator created using specific class for PositionList data structures : ElementIterator
     public Iterator<E> iterator() {
-        return new MyIterator(this);
+        return new ElementIterator<E>(this);
     }
 
-    class MyIterator implements Iterator<E>{
-
-        public MyIterator (NodePositionList<E> structure){
-
-             new_structure = new NodePositionList<E>();
-             if (structure.size() != 0){
-                 Position<E> temp;
-                 for (temp = structure.first() ; temp!= structure.last()  ; temp = structure.next(temp)){
-                     new_structure.addLast(temp.element());
-                 }
-                 new_structure.addLast(temp.element());
-             }
-
-        }
-
-        @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 ();
-        }
-
-        NodePositionList<E> new_structure;
-        Position<E> pos = null;
-
-
-    }
-
-    @Override
     public Iterator<Position<E>> positions() {
         return new MyPositionsIterator(this);
     }

position/PositionList.java

@@ -37,8 +37,5 @@ public interface PositionList<E> extends Iterable<E> {
   public E set(Position<E> p, E e) throws InvalidPositionException;
 
 
-  public Iterator<Position<E>> positions();
-
-
 }
 

sequence/ArraySequence.java

@@ -4,6 +4,7 @@ import exceptions.BoundaryViolationException;
 import exceptions.EmptyListException;
 import exceptions.EmptySequenceException;
 import exceptions.InvalidPositionException;
+import iterator.IndexListIterator;
 import position.Position;
 import sequence.utility.ArrayPosition;
 
@@ -287,12 +288,14 @@ public class ArraySequence<E> implements Sequence<E> {
 
 
     @Override
+    ///////////////// implemented used a generic IndexListIterator
     public Iterator<E> iterator() {
-        return null;
-    }
 
-    @Override
-    public Iterator<Position<E>> positions() {
-        return null;
+        E[] temp = (E[])new Object[this.size()];
+        for (int i = 0 ;i < this.size(); i++){
+            temp[i] = this.get(i);
+        }
+        return new IndexListIterator<E>(temp);
+
     }
 }