//创建ajax通信对象
function AjaxComm()
{	
	//properties declaration
	/******/
	this.xmlHttp = null;
	this.respFunc = null;
	this.iSoapMaxLen = 480;
	this.strUrl = "";
	/******/
	AjaxComm.prototype.CommObject = this;
	/**************/
	//保留此创建函数，兼容传统的js文件引入形式
	AjaxComm.prototype.create__xmlHttp = function()
	{
		if((typeof(__gcomm__xmlHttp) != "undefined") && __gcomm__xmlHttp)
		{
			this.xmlHttp = __gcomm__xmlHttp;
			return;
		}
			
		/////////
		//Init XMLHttpRequest Object;
		if(window.ActiveXObject) 
		{  
			//IE Browser
			var MSXML = ['Microsoft.XMLHTTP', 'Msxml2.XMLHTTP', 'Msxml2.XMLHTTP.3.0', 
				'Msxml2.XMLHTTP.4.0', 'Msxml2.XMLHTTP.5.0'];
			for(var i = 0; i < MSXML.length; i++)
			{
				try
				{
					__gcomm__xmlHttp = new ActiveXObject(MSXML[i]);					
					break;
				}
				catch(e)
				{
					__gcomm__xmlHttp = null;
				}
			}
		}
		else if(window.XMLHttpRequest) 
		{ 
			//mozilla Browser
			__gcomm__xmlHttp = new XMLHttpRequest(); 
			//有些版本的Mozilla浏览器处理服务器返回的未包含XML mime-type头部信息的内容时会出错。  
			if(__gcomm__xmlHttp.overrideMimeType)
			{
				__gcomm__xmlHttp.overrideMimeType="text/xml";
			}    
		}	
	};
	
	this.create__xmlHttp();
	/**************/
	/////////
	//define CallBack response Function
	this.ProcResponse = function() 
	{
		if(!AjaxComm.prototype.CommObject) return;		
		var xmlHttp = AjaxComm.prototype.CommObject.xmlHttp;
		if(!xmlHttp) return;
		
		////////////
		//xmlHttp.responseXml, xmlHttp.responseText
		//xmlHttp.readyState, xmlHttp.statusText
		////////////
		var bGetOk = false;					
		if(xmlHttp.readyState == 4) 
		{
			if(xmlHttp.status == 200) bGetOk = true;
			var respFunc = AjaxComm.prototype.CommObject.respFunc;
			if(respFunc) respFunc(xmlHttp, bGetOk);
		} 
	};	
	/////////
	
	/////////
	//用于设置缺省的业务处理servlet地址
	this.setHostPortUrl = function(strServName, strHost, strPort)
	{
		if(!strHost) strHost = window.location.hostname;
		if(!strPort) strPort = window.location.port;
		if(!strPort) strPort = 80;
		this.strUrl = "http://" + strHost + ":" + strPort + "/jwFrame/servlet/" + strServName;
	};
	/////////
	
	this.SendCmd = function(headParam, strMethod, strCmd, respFunc, passport, password, bUrlSeted)
	{		
		var bAsync = false;
		if(!this.xmlHttp) this.create__xmlHttp();
		if(!bUrlSeted) this.setHostPortUrl("owbservlet");
		if(!this.xmlHttp || !this.strUrl)
		{
			alert("通信对象未建立或者通信目标地址为空，执行失败 ！");
			return false;
		}
		
		//////		
		if(respFunc)
		{		
			this.respFunc = respFunc;
			AjaxComm.prototype.CommObject = this;
			this.xmlHttp.onreadystatechange = this.ProcResponse;
			bAsync = true;	
		}
		else
		{				
			this.xmlHttp.onreadystatechange = function(xmlHttp, bRet){};
			this.respFunc = null;
		}	
		//////
		if(!strMethod) strMethod = "POST";
		this.xmlHttp.open(strMethod, this.strUrl, bAsync, passport, password); 	
		this.xmlHttp.setRequestHeader("Content-Type", "text/html; charset=UTF-8");
		var iCmdLength = strCmd ? strCmd.length : 0;
		this.xmlHttp.setRequestHeader("Content-Leng", NumberToStr(iCmdLength));
		////////					
		if(headParam)
		{ 	
			for(var prop in headParam)
			{
				var strValue = headParam[prop];
				if(!strValue) strValue = "";
				this.xmlHttp.setRequestHeader(prop, strValue);
			}
		}
		////////	
		var bRet = true;		
		try
		{
			this.xmlHttp.send(strCmd);			
		}
		catch(e)
		{	
			bRet = false;
		}
		return bRet;
	};
	
	this.getSendPackNo = function()
	{
		if(!window.top.__iSendPackNo)
		{
			window.top.__iSendPackNo = 1;
		}
		else
		{
			window.top.__iSendPackNo ++;
			if(window.top.__iSendPackNo > 40960) window.top.__iSendPackNo = 1;
		}
		return window.top.__iSendPackNo;
	};
	
	/////////
	//补丁：发送Execute命令包过长时的解决办法
	this.Send_ExecutCmd = function(headParam, strMethod, strCmd, respFunc, passport, password)
	{
		if(strCmd && (strCmd.length > this.iSoapMaxLen))
		{
			///////////////
			//按长度分段传送命令传
			var bRet = false;			
			var iSort = 0;
			var strCmdFrage = "";
			var iSendPackNo = this.getSendPackNo();
			var strSendPackFlag = Math.floor(Math.random() * 100000000) + "";
					
			while(true)
			{	
				strCmdFrage = strCmd.substr(iSort * this.iSoapMaxLen, this.iSoapMaxLen);
				//格式:PackNo.SortNo.PackCount
				iSort = iSort + 1;
				headParam.packno = NumberToStr(iSendPackNo) + "." + NumberToStr(iSort);
				headParam.sendpackflag = strSendPackFlag;
				
				var bSendOver = false;
				//发完最后一个单元，或者没有新的单元可加
				if(iSort * this.iSoapMaxLen >= strCmd.length)
				{
					//最后一帧，加上帧长（告之服务器）
					headParam.packno = headParam.packno + "." + NumberToStr(iSort);
					bSendOver = true;
				}
				
				var bContinue = false;
				bRet = this.SendCmd(headParam, strMethod, strCmdFrage, respFunc, passport, password);
				if(bRet) 
				{
					if(this.xmlHttp.readyState == 4) 
					{ 			
						if(this.xmlHttp.status == 200) 
						{
							bContinue = (this.xmlHttp.responseText == "CONTINUE");
						}
					}
				}				
				if(!bRet || !bContinue || bSendOver) break;
			}					
			return bRet;
		}
		else
		{
			return this.SendCmd(headParam, strMethod, strCmd, respFunc, passport, password);
		}
	};
	/////////
	
	this.getClientConnId = function()
	{
		if(!window.top.iConnectionId || (window.top.iConnectionId <= 0))
		{
			var headParam = {cmdCode:"getcltconnid"};
			var strId = this.pubGetServerInfo(headParam);
			window.top.iConnectionId = StrToInteger(strId, 0);
		}
		return window.top.iConnectionId;
	};
	
	this.Execute = function(strCmd, headParam)
	{
		var iCltConId = this.getClientConnId();
		if(!headParam) headParam = {};
		headParam.cmdCode = "execute";
		headParam.conId = iCltConId;
		var bSendRet = this.Send_ExecutCmd(headParam, "POST", strCmd);		
		if(bSendRet && (this.xmlHttp.readyState == 4))
		{ 			
			if(this.xmlHttp.status == 200)
			{									
				return this.xmlHttp.responseText;
			}
			else
			{
				return "ERROR-SERVLET-FAIL";
			}
		}
		else
		{
			var strErrCode = this.xmlHttp.statusText;
			if(!strErrCode)
			{
				if(this.xmlHttp.readyState) strErrCode = this.xmlHttp.readyState;
				if(this.xmlHttp.status) strErrCode = (strErrCode ? (strErrCode + "-") : "") + this.xmlHttp.status;
			}
			if(strErrCode) strErrCode = "NULL";
			return "ERROR-CODE: " + strErrCode;
		}		
		return "ERROR-CLIENT-EXECUTE";
	};
	
	this.pubGetServerInfo = function(headParam, strCmd)
	{
		var strRet = undefined;
		var bSendRet = this.SendCmd(headParam, "POST", strCmd);
		if(bSendRet && (this.xmlHttp.readyState == 4))
		{
			if(this.xmlHttp.status == 200)
			{
				strRet = this.xmlHttp.responseText;
			}
		}
		return strRet;
	};
	
	this.loadServerContent = function(sFileUrl)
	{
		var bLoadSucceed = true;
		if(!this.xmlHttp) this.create__xmlHttp();
		if(!this.xmlHttp)
		{
			alert("因通信对象未能建立成功，加载失败 ！");
			return null;
		}
		
		var strSource = "";
		try
		{
			this.xmlHttp.open('GET', sFileUrl, false); 
		    this.xmlHttp.send(null);
		}
		catch(e)
		{
			bLoadSucceed = false;
			alert("错误：从服务器加载文件[" + sFileUrl + "]失败!");
			return null
		}
		
	    if((this.xmlHttp.readyState == 4) && bLoadSucceed)
		{ 			
			if(this.xmlHttp.status == 200) 
			{
				strSource = this.xmlHttp.responseText;
			}
		}
		
		return strSource;
	};
	
	this.loadServerFile = function(sFileUrl)
	{
		var strSource = this.loadServerContent(sFileUrl);
		if(strSource) return this.mkJsFileVailable(null, strSource);
		return false;
	};
	
	this.mkJsFileVailable = function(strFileId, strSource, winObj, lng)
	{
		var bRet = false;
		if(!winObj) winObj = window;
			
		var oHead = winObj.document.getElementsByTagName('HEAD').item(0);
		if(!oHead) return false;
		if(!lng) lng = "javascript";	
		var oScript = winObj.document.createElement("script");
		
		oScript.type = "text/" + lng; 
		oScript.language = lng;
		if(strFileId) oScript.id = strFileId; 		
		oScript.defer = true; 		
		oScript.text = strSource;
		
		try
		{
			oHead.appendChild(oScript);
			bRet = true;
		}
		catch(e)
		{
			oHead.removeChild(oScript);
		}
		
		return bRet;
	};
}

/**************/
//释放ajax通信对象
function delAjaxComm(ajaxCommObj)
{
	if(!ajaxCommObj) return;
	if(ajaxCommObj.xmlHttp)
	{
		delete ajaxCommObj.xmlHttp;
	}
	delete ajaxCommObj;
}
/**************/