function DataSet(json)
{	
	this._parameters = {};//参数
	
	this._headers = {};//题头
	
	this._rowsets = {};//数据集合
	
	this._init = function()
	{
		if(json != null)
		{
			this._parameters = json["parameters"];
			this._headers = json["headers"];
			var rowsetData = json["rowsets"];
			for(var rowsetName in rowsetData)
			{
				this._rowsets[rowsetName] = new RowSet(rowsetData[rowsetName]);
			}			
		}
	}
	
	this.append = function(dc)
	{
		var headers = dc.getHeaders();
		for(var tempHeaderId in headers)
		{
			this._headers[tempHeaderId] = headers[tempHeaderId];
		}
		var parameters = dc.getParameters();
		for(var tempParameterId in parameters)
		{
			this._parameters[tempParameterId] = parameters[tempParameterId];
		}
		var  rowSets =  dc.getRowSets();
		for(var tempRowSetId in rowSets)
		{
			this._rowsets[tempRowSetId] =  new RowSet(rowSets[tempRowSetId].getData());
		}
	}
	
	this.setParameter = function(name,value)
	{
		this._parameters[name] = value;
	}
	
	this.removeParameter = function(name)
	{
		delete this._parameters[name];
	}
	
	this.setHeader = function(name,value)
	{
		this._headers[name] = value;
	}
	
	this.removeHeader = function(name)
	{
		delete this._headers[name];
	}
	
	this.getHeader = function(name)
	{
		return this._headers[name];
	}
	
	this.getHeaders = function()
	{
		return this._headers;
	}
	
	this.getParameter = function(name)
	{
		return this._parameters[name];
	}
	
	this.getParameters = function()
	{
		return this._parameters;
	}
	
	this.setParameters = function(parameters)
	{
		this._parameters = parameters;
	}
	
	this.addRowSet = function(rowSet)
	{
		this._rowsets[rowSet.getName()] = rowSet;
	}
	
	this.getRowSets = function()
	{
		return this._rowsets;
	}
	
	this.removeRowSet = function(name)
	{
		delete this._rowsets[name];
	}
	
	this.getRowSet = function(name)
	{
		return this._rowsets[name] || new RowSet();
	}
	
	//转换成json数据
	this.clone = function()
	{
		var obj = {}
		obj["parameters"] = this._parameters;
		obj["rowsets"] = this._getRowSetData();
		obj["headers"] = this._headers;
		return obj;
	}
	
	this._getRowSetData = function()
	{
		var obj = {};
		for(var rowsetName in this._rowsets)
		{
			obj[rowsetName] = this._rowsets[rowsetName].getData();
		}
		return obj;	
	}
	
	this._init();
}