From 9328c4c25efe8d665430f8cca57f36180cfa06fa Mon Sep 17 00:00:00 2001
From: Giovanni Di Grezia <xgiovio@gmail.com>
Date: Mon, 24 Mar 2014 11:22:54 +0100
Subject: [PATCH] Implementata completamente la deque

---
 com/xgiovio/DequeTest.java | 106 +++++++++++++++++++++++++++++++++++++
 deque/NodeDeque.java       |  83 ++++++++++++++++++++++++++---
 deque/utility/DLNode.java  |  40 +++++++++++++-
 3 files changed, 222 insertions(+), 7 deletions(-)
 create mode 100644 com/xgiovio/DequeTest.java

diff --git a/com/xgiovio/DequeTest.java b/com/xgiovio/DequeTest.java
new file mode 100644
index 0000000..f611f36
--- /dev/null
+++ b/com/xgiovio/DequeTest.java
@@ -0,0 +1,106 @@
+package com.xgiovio;
+
+import deque.Deque;
+import deque.NodeDeque;
+import general_utility.test_object;
+import stack.NodeStack;
+
+/**
+ * Created with xgiovio.macbookair.
+ * User: xgiovio
+ * Date: 23/03/14
+ * Time: 20:37
+ */
+public class DequeTest {
+
+    public static void main(String[] args) {
+       NodeDeque<test_object> a = new NodeDeque<test_object>();
+
+        System.out.print(a.isEmpty());
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addFirst(new test_object(10));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addFirst(new test_object(20));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addLast(new test_object(30));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addLast(new test_object(40));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addLast(new test_object(50));
+        a.addLast(new test_object(60));
+        a.addLast(new test_object(70));
+        System.out.print(a.size());
+        System.out.print(a.isEmpty());
+        System.out.println(a);
+
+        a.removeFirst();
+        System.out.println(a);
+        a.removeFirst();
+        System.out.println(a);
+        a.removeFirst();
+        System.out.println(a);
+        System.out.print(a.size());
+        System.out.print(a.isEmpty());
+
+        a.removeLast();
+        System.out.println(a);
+        a.removeLast();
+        System.out.println(a);
+        a.removeLast();
+        System.out.println(a);
+        a.removeLast();
+        System.out.println(a);
+        System.out.print(a.size());
+        System.out.print(a.isEmpty());
+
+
+        a.addFirst(new test_object(10));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addFirst(new test_object(20));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addLast(new test_object(30));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addLast(new test_object(40));
+        System.out.print(a.size());
+        System.out.print(a);
+        a.addLast(new test_object(50));
+        a.addLast(new test_object(60));
+        a.addLast(new test_object(70));
+        System.out.print(a.size());
+        System.out.print(a.isEmpty());
+        System.out.println(a);
+
+        a.removeFirst();
+        System.out.println(a);
+        a.removeFirst();
+        System.out.println(a);
+        a.removeFirst();
+        System.out.println(a);
+        System.out.print(a.size());
+        System.out.print(a.isEmpty());
+
+        a.removeLast();
+        System.out.println(a);
+        a.removeLast();
+        System.out.println(a);
+        a.removeLast();
+        System.out.println(a);
+        a.removeLast();
+        System.out.println(a);
+        System.out.print(a.size());
+        System.out.print(a.isEmpty());
+
+
+
+
+    }
+
+}
diff --git a/deque/NodeDeque.java b/deque/NodeDeque.java
index dbfed1d..8715f04 100644
--- a/deque/NodeDeque.java
+++ b/deque/NodeDeque.java
@@ -1,5 +1,6 @@
 package deque;
 
+import deque.utility.DLNode;
 import exceptions.EmptyDequeException;
 
 /**
@@ -10,43 +11,113 @@ import exceptions.EmptyDequeException;
  */
 public class NodeDeque<E> implements Deque <E>  {
 
+    public NodeDeque(){
+        header.setNext(trailer);
+        trailer.setPrev(header);
+    }
+
     @Override
     public int size() {
-        return 0;
+        return nelements;
     }
 
     @Override
     public boolean isEmpty() {
-        return false;
+        if (nelements == 0){
+            return true;
+        } else{
+            return  false;
+        }
     }
 
     @Override
     public E getFirst() throws EmptyDequeException {
-        return null;
+        if (isEmpty()){
+            throw new EmptyDequeException();
+        } else {
+            return header.getNext().getElement();
+        }
     }
 
     @Override
     public E getLast() throws EmptyDequeException {
-        return null;
+        if (isEmpty()){
+            throw new EmptyDequeException();
+        } else {
+            return trailer.getPrev().getElement();
+        }
     }
 
     @Override
     public void addFirst(E element) {
+        DLNode<E> temp = new DLNode<E>(element);
+        temp.setNext(header.getNext());
+        temp.getNext().setPrev(temp);
+        header.setNext(temp);
+        temp.setPrev(header);
+        nelements++;
 
     }
 
     @Override
     public void addLast(E element) {
+        DLNode<E> temp = new DLNode<E>(element);
+        temp.setPrev(trailer.getPrev());
+        temp.getPrev().setNext(temp);
+        temp.setNext(trailer);
+        trailer.setPrev(temp);
+        nelements++;
 
     }
 
     @Override
     public E removeFirst() throws EmptyDequeException {
-        return null;
+        if (isEmpty()){
+            throw new EmptyDequeException();
+        } else {
+            DLNode<E> temp = header.getNext();
+            header.setNext( header.getNext().getNext());
+            header.getNext().setPrev(header);
+            nelements--;
+            return temp.getElement();
+        }
     }
 
     @Override
     public E removeLast() throws EmptyDequeException {
-        return null;
+        if (isEmpty()){
+            throw new EmptyDequeException();
+        } else {
+            DLNode<E> temp = trailer.getPrev();
+            trailer.setPrev(trailer.getPrev().getPrev());
+            trailer.getPrev().setNext(trailer);
+            nelements--;
+            return temp.getElement();
+        }
     }
+
+
+    @Override
+    public String toString() {
+
+        String to_return = "";
+        to_return = to_return + "[";
+
+        for (  DLNode<E> temp = header.getNext(); temp != trailer ; temp = temp.getNext()){
+
+            if ( temp.getNext() == trailer){
+                to_return+=(temp.getElement().toString());
+            }else{
+                to_return+=( temp.getElement().toString() + ",");
+            }
+        }
+        to_return = to_return + "]";
+
+        return to_return;
+    }
+
+    private DLNode<E> header = new DLNode<E>();
+    private DLNode<E> trailer = new DLNode<E>();
+    private int nelements = 0;
+
 }
diff --git a/deque/utility/DLNode.java b/deque/utility/DLNode.java
index 02b42e0..34ad38a 100644
--- a/deque/utility/DLNode.java
+++ b/deque/utility/DLNode.java
@@ -6,5 +6,43 @@ package deque.utility;
  * Date: 17/03/14
  * Time: 16:32
  */
-public class DLNode {
+public class DLNode <E> {
+
+    public DLNode (){
+        element = null;;
+    }
+
+    public DLNode (E in_element){
+        element = in_element;
+    }
+
+    public void setElement (E in_element){
+        element = in_element;
+    }
+
+    public void setNext (DLNode<E> in_next){
+        next = in_next;
+    }
+
+    public void setPrev (DLNode<E> in_prev){
+        prev = in_prev;
+    }
+
+    public E getElement (){
+        return  element;
+    }
+
+    public DLNode<E> getNext() {
+        return next;
+    }
+
+    public DLNode<E> getPrev() {
+        return prev;
+    }
+
+      private DLNode<E> next = null;
+      private DLNode<E> prev = null;
+      private E element;
+
+
 }