数据结构与算法(C#实现)系列---AVLTree（二）

         //---------------override--------------------

         public override void AttachKey(object _obj)

         {

              if(!IsEmpty())

                   throw new Exception("My:this node must be a empty tree node!");

              this.key=_obj;

              //产生一个degree长的数组,并将其初始化为空树

              this.treeList=new ArrayList();

              this.treeList.Capacity=(int)this.degree;

              for(int i=0;i<this.degree;i++)

              {

                   treeList.Add(new AVLTree());

              }

              //

              this.height=0;

         }

         //在改动树的结构后平衡树

         public override void Balance()

         {

              this.AdjustHeight();

              //大于1则说明不平衡

              if( Math.Abs(this.BalanceFactor())>1)

              {

                   if(this.BalanceFactor()>0)

                   {

                       if (((AVLTree)this.Left).BalanceFactor()>0)

                            this.LLRotation();

                       else

                            this.LRRotation();

                   }                 

                   else

                   {

                       if (((AVLTree)this.Right).BalanceFactor()<0)

                            this.RRRotation();

                       else

                            this.RLRotation();

                   }

              }

         }

         public int Height{get{return this.height;}}

}