/js/lib/Socket.IO-node/support/socket.io-client/lib/transports/websocket.js

/**
 * Socket.IO client
 * 
 * @author Guillermo Rauch <guillermo@learnboost.com>
 * @license The MIT license.
 * @copyright Copyright (c) 2010 LearnBoost <dev@learnboost.com>
 */

(function(){
	var io = this.io;
	
	var WS = io.Transport.websocket = function(){
		io.Transport.apply(this, arguments);
	};
	
	io.util.inherit(WS, io.Transport);
	
	WS.prototype.type = 'websocket';
	
	WS.prototype.connect = function(){
		var self = this;
		this.socket = new WebSocket(this._prepareUrl());
		this.socket.onmessage = function(ev){ self._onData(ev.data); };
		this.socket.onclose = function(ev){ self._onClose(); };
    this.socket.onerror = function(e){ self._onError(e); };
		return this;
	};
	
	WS.prototype.send = function(data){
		if (this.socket) this.socket.send(this._encode(data));
		return this;
	};
	
	WS.prototype.disconnect = function(){
		if (this.socket) this.socket.close();
		return this;
	};
	
	WS.prototype._onClose = function(){
		this._onDisconnect();
		return this;
	};

  WS.prototype._onError = function(e){
    this.base.emit('error', [e]);
  };
	
	WS.prototype._prepareUrl = function(){
		return (this.base.options.secure ? 'wss' : 'ws') 
		+ '://' + this.base.host 
		+ ':' + this.base.options.port
		+ '/' + this.base.options.resource
		+ '/' + this.type
		+ (this.sessionid ? ('/' + this.sessionid) : '');
	};
	
	WS.check = function(){
		// we make sure WebSocket is not confounded with a previously loaded flash WebSocket
		return 'WebSocket' in window && WebSocket.prototype && ( WebSocket.prototype.send && !!WebSocket.prototype.send.toString().match(/native/i)) && typeof WebSocket !== "undefined";
	};

	WS.xdomainCheck = function(){
		return true;
	};
	
})();