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// Spry.Data.HTTPSourceDataSet
// base class for any DataSet that uses external
//
//////////////////////////////////////////////////////////////////////

Spry.Data.HTTPSourceDataSet = function(dataSetURL, dataSetOptions)
{
	// Call the constructor for our DataSet base class so that
	// our base class properties get defined. We'll call setOptions
	// manually after we set up our HTTPSourceDataSet properties.

	Spry.Data.DataSet.call(this);

	// HTTPSourceDataSet Properties:

	this.url = dataSetURL;
	this.dataSetsForDataRefStrings = new Array;
	this.hasDataRefStrings = false;
	this.useCache = true;

	this.setRequestInfo(dataSetOptions, true);

	Spry.Utils.setOptions(this, dataSetOptions, true);

	this.recalculateDataSetDependencies();

	if (this.loadInterval > 0)
		this.startLoadInterval(this.loadInterval);
}; // End of Spry.Data.HTTPSourceDataSet() constructor.

Spry.Data.HTTPSourceDataSet.prototype = new Spry.Data.DataSet();
Spry.Data.HTTPSourceDataSet.prototype.constructor = Spry.Data.HTTPSourceDataSet;

Spry.Data.HTTPSourceDataSet.prototype.setRequestInfo = function(requestInfo, undefineRequestProps)
{
	// Create a loadURL request object to store any load options
	// the caller specified. We'll fill in the URL at the last minute
	// before we make the actual load request because our URL needs
	// to be processed at the last possible minute in case it contains
	// data references.

	this.requestInfo = new Spry.Utils.loadURL.Request();
	this.requestInfo.extractRequestOptions(requestInfo, undefineRequestProps);

	// If the caller wants to use "POST" to fetch the data, but didn't
	// provide the content type, default to x-www-form-urlencoded.

	if (this.requestInfo.method == "POST")
	{
		if (!this.requestInfo.headers)
			this.requestInfo.headers = {};
		if (!this.requestInfo.headers['Content-Type'])
			this.requestInfo.headers['Content-Type'] = "application/x-www-form-urlencoded; charset=UTF-8";
	}
};

Spry.Data.HTTPSourceDataSet.prototype.recalculateDataSetDependencies = function()
{
	this.hasDataRefStrings = false;

	// Clear all old callbacks that may have been registered.

	var i = 0;
	for (i = 0; i < this.dataSetsForDataRefStrings.length; i++)
	{
		var ds = this.dataSetsForDataRefStrings[i];
		if (ds)
			ds.removeObserver(this);
	}

	// Now run through the strings that may contain data references and figure
	// out what data sets they require. Note that the data references in these
	// strings must be fully qualified with a data set name. (ex: {dsDataSetName::columnName})

	this.dataSetsForDataRefStrings = new Array();

	var regionStrs = this.getDataRefStrings();

	var dsCount = 0;

	for (var n = 0; n < regionStrs.length; n++)
	{
		var tokens = Spry.Data.Region.getTokensFromStr(regionStrs[n]);

		for (i = 0; tokens && i < tokens.length; i++)
		{
			if (tokens[i].search(/{[^}:]+::[^}]+}/) != -1)
			{
				var dsName = tokens[i].replace(/^\{|::.*\}/g, "");
				var ds = null;
				if (!this.dataSetsForDataRefStrings[dsName])
				{
					try { ds = eval(dsName); } catch (e) { ds = null; }

					if (dsName && ds)
					{
						// The dataSetsForDataRefStrings array serves as both an
						// array of data sets and a hash lookup by name.

						this.dataSetsForDataRefStrings[dsName] = ds;
						this.dataSetsForDataRefStrings[dsCount++] = ds;
						this.hasDataRefStrings = true;
					}
				}
			}
		}
	}

	// Set up observers on any data sets our URL depends on.

	for (i = 0; i < this.dataSetsForDataRefStrings.length; i++)
	{
		var ds = this.dataSetsForDataRefStrings[i];
		ds.addObserver(this);
	}
};

Spry.Data.HTTPSourceDataSet.prototype.getDataRefStrings = function()
{
	var strArr = [];
	if (this.url) strArr.push(this.url);