// SpryDataExtensions.js - version 0.1 - Spry Pre-Release 1.5 Preview
//
// Copyright (c) 2007. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// POSSIBILITY OF SUCH DAMAGE.

//////////////////////////////////////////////////////////////////////
//
// Support for multiple non-destructive filters on a Data Set.
//
//////////////////////////////////////////////////////////////////////

Spry.Data.DataSet.multiFilterFunc = function(row, rowNumber)
{
	var filters = this.activeFilters;
	if (filters)
	{
		var numFilters = filters.length;
		for (var i = 0; i < numFilters; i++)
		{
			row = filters[i](this, row, rowNumber);
			if (!row)
				break;
		}
	}
	return row;
};

Spry.Data.DataSet.prototype.addFilter = function(filterFunc, doApplyFilters)
{
	if (!this.hasFilter(filterFunc))
	{
		if (!this.activeFilters)
			this.activeFilters = [];
		this.activeFilters.push(filterFunc);
	}
	if (doApplyFilters)
		this.applyFilters();
};

Spry.Data.DataSet.prototype.removeFilter = function(filterFunc, doApplyFilters)
{
	var filters = this.activeFilters;
	if (filters)
	{
		var numFilters = filters.length;
		for (var i = 0; i < numFilters; i++)
		{
			if (filters[i] == filterFunc)
			{
				this.activeFilters.splice(i, 1);
				if (doApplyFilters)
					this.applyFilters();
				return;
			}
		}
	}
};

Spry.Data.DataSet.prototype.removeAllFilters = function()
{
	var filters = this.activeFilters;
	if (filters && filters.length > 0)
	{
		this.activeFilters = [];
		this.filter(null);
	}
};

Spry.Data.DataSet.prototype.getFilters = function(filterFunc)
{
	if (!this.activeFilters)
		this.activeFilters = [];
	return this.activeFilters;
}

Spry.Data.DataSet.prototype.applyFilters = function()
{
	if (this.activeFilters && this.activeFilters.length > 0)
		this.filter(Spry.Data.DataSet.multiFilterFunc);
};

Spry.Data.DataSet.prototype.hasFilter = function(filterFunc)
{
	if (!this.activeFilters && this.activeFilters > 0)
	{
		var filters = this.activeFilters;
		var numFilters = filters.length;
		for (var i = 0; i < numFilters; i++)
		{
			if (filters[i] == filterFunc)
				return true;
		}
	}
	return false;
};