GZ/nwyj/WebContent/admin/scripts/dojo/dojox/encoding/splay.js

if (!dojo._hasResource["dojox.encoding.splay"]) { // _hasResource checks added
													// by build. Do not use
													// _hasResource directly in
													// your code.
	dojo._hasResource["dojox.encoding.splay"] = true;
	dojo.provide("dojox.encoding.splay");

	dojox.encoding.Splay = function(n) {
		this.up = new Array(2 * n + 1);
		this.left = new Array(n);
		this.right = new Array(n);
		this.reset();
	};

	dojo.extend(dojox.encoding.Splay, {
		reset : function() {
			for (var i = 1; i < this.up.length; this.up[i] = Math.floor((i - 1)
					/ 2), ++i);
			for (var i = 0; i < this.left.length; this.left[i] = 2 * i + 1, this.right[i] = 2
					* i + 2, ++i);
		},
		splay : function(i) {
			var a = i + this.left.length;
			do {
				var c = this.up[a];
				if (c) { // root
					// rotated pair
					var d = this.up[c];
					// swap descendants
					var b = this.left[d];
					if (c == b) {
						b = this.right[d];
						this.right[d] = a;
					} else {
						this.left[d] = a;
					}
					this[a == this.left[c] ? "left" : "right"][c] = b;
					this.up[a] = d;
					this.up[b] = c;
					a = d;
				} else {
					a = c;
				}
			} while (a); // root
		},
		encode : function(value, stream) {
			var s = [], a = value + this.left.length;
			do {
				s.push(this.right[this.up[a]] == a);
				a = this.up[a];
			} while (a); // root
			this.splay(value);
			var l = s.length;
			while (s.length) {
				stream.putBits(s.pop() ? 1 : 0, 1);
			}
			return l;
		},
		decode : function(stream) {
			var a = 0; // root;
			do {
				a = this[stream.getBits(1) ? "right" : "left"][a];
			} while (a < this.left.length);
			a -= this.left.length;
			this.splay(a);
			return a;
		}
	});

}