Example #1
0
        /// <summary>
        ///getting enumerator
        /// </summary>
        /// <returns></returns>
        public IEnumerator <KeyValuePair <TKey, TValue> > GetEnumerator()
        {
            if (RBroot != RBLeaf.Instance())
            {
                RBNode         elem        = RBroot;
                Stack <RBNode> nodes       = new Stack <RBNode>();
                bool           elemsOnLeft = true;
                nodes.Push(elem);
                while (nodes.Count > 0)
                {
                    if (elemsOnLeft)
                    {
                        while (elem.left != RBLeaf.Instance())
                        {
                            nodes.Push(elem);
                            elem = elem.left;
                        }
                    }
                    yield return(new KeyValuePair <TKey, TValue>(elem.key, elem.value));

                    if (elem.right == RBLeaf.Instance())
                    {
                        elem        = nodes.Pop();
                        elemsOnLeft = false;
                    }
                    else
                    {
                        elem        = elem.right;
                        elemsOnLeft = true;
                    }
                }
            }
        }
Example #2
0
 /// <summary>
 /// searching minimum element in tree.
 /// </summary>
 /// <param name="elem"></param>
 /// <returns></returns>
 private RBNode RBMin(RBNode elem)
 {
     while (elem.left != RBLeaf.Instance())
     {
         elem = elem.right;
     }
     return(elem);
 }
Example #3
0
        /// <summary>
        /// adding key and value
        /// </summary>
        /// <param name="elemKey"></param>
        /// <param name="elemVal"></param>
        public void Add(TKey elemKey, TValue elemVal)
        {
            RBNode newNode = new RBNode();

            newNode.key   = elemKey;
            newNode.value = elemVal;
            newNode.left  = RBLeaf.Instance();
            newNode.right = RBLeaf.Instance();
            Add(newNode);
            count++;
            entries.Add(newNode);
        }
Example #4
0
 /// <summary>
 /// Moving two nodes
 /// </summary>
 /// <param name="v1"></param>
 /// <param name="v2"></param>
 private void RBMove(RBNode v1, RBNode v2)
 {
     if (v1.parent == RBLeaf.Instance())
     {
         RBroot = v2;
     }
     else if (v1 == v1.parent.left)
     {
         v1.parent.left = v2;
     }
     else
     {
         v1.parent.right = v2;
     }
     v2.parent = v1.parent;
 }
Example #5
0
        /// <summary>
        /// adding node
        /// </summary>
        /// <param name="elem"></param>
        private void Add(RBNode elem)
        {
            RBNode temp1 = RBLeaf.Instance();
            RBNode temp2 = RBroot;

            while (temp2 != RBLeaf.Instance())
            {
                temp1 = temp2;
                if (elem.key.CompareTo(temp2.key) < 0)
                {
                    temp2 = temp2.left;
                }
                else if (elem.key.CompareTo(temp2.key) > 0)
                {
                    temp2 = temp2.right;
                }
                else if (elem.key.CompareTo(temp2.key) == 0)
                {
                    return;
                }
            }

            elem.parent = temp1;
            if (temp1 == RBLeaf.Instance())
            {
                RBroot = elem;
            }
            else if (elem.key.CompareTo(temp1.key) < 0)
            {
                temp1.left = elem;
            }
            else if (elem.key.CompareTo(temp1.key) > 0)
            {
                temp1.right = elem;
            }
            else if (elem.key.CompareTo(temp1.key) == 0)
            {
                return;
            }
            elem.left  = RBLeaf.Instance();
            elem.right = RBLeaf.Instance();
            elem.color = Color.red;
            elem       = RBFixInsertion(elem);
        }
Example #6
0
        /// <summary>
        /// deleting node
        /// </summary>
        /// <param name="elem"></param>
        private void RBDelete(RBNode elem)
        {
            RBNode temp1;
            RBNode temp2     = elem;
            Color  tempColor = temp2.color;

            if (elem.left == RBLeaf.Instance())
            {
                temp1 = elem.right;
                RBMove(elem, elem.right);
            }

            else if (elem.right == RBLeaf.Instance())
            {
                temp1 = elem.left;
                RBMove(elem, elem.left);
            }
            else
            {
                temp2     = RBMin(elem.right);
                tempColor = temp2.color;
                temp1     = temp2.right;
                if (temp2.parent == elem)
                {
                    temp1.parent = temp2;
                }
                else
                {
                    RBMove(temp1, temp2.right);
                    temp2.right        = elem.right;
                    temp2.right.parent = temp2;
                }
                RBMove(elem, temp2);
                temp2.left        = elem.left;
                temp2.left.parent = temp2;
                temp2.color       = elem.color;
            }
            if (tempColor == Color.black)
            {
                RBFixDeletion(temp1);
            }
        }
Example #7
0
        /// <summary>
        /// Getting node with key
        /// </summary>
        /// <param name="elemKey"></param>
        /// <returns></returns>
        private RBNode GetNode(TKey elemKey)
        {
            RBNode node = RBroot;

            while (node != RBLeaf.Instance())
            {
                if (elemKey.CompareTo(node.key) < 0)
                {
                    node = node.left;
                }
                else if (elemKey.CompareTo(node.key) > 0)
                {
                    node = node.right;
                }
                else
                {
                    return(node);
                }
            }
            return(null);
        }
Example #8
0
 /// <summary>
 /// parameterless constructor
 /// </summary>
 public RBTree()
 {
     RBroot  = RBLeaf.Instance();
     entries = new List <RBNode>(count);
 }