define( function() {
"use strict";

var DataStoreUtils = {};

DataStoreUtils.extractData = function( oDataStore )
{
	var aColumns = [];
	var iColumnCount = oDataStore.columnCount;
	for ( var iCol = 0; iCol < iColumnCount; iCol++ )
	{
		aColumns[iCol] =
			{
				name : oDataStore.columnNames[iCol],
				dataType : oDataStore.dataTypes[iCol],
				values : oDataStore.columnFormattedValues[iCol] || oDataStore.columnValues[iCol],
			};
	}

	var aRows = [];
	var iRowCount = oDataStore.rowCount;
	for ( var iRow = 0; iRow < iRowCount; iRow++ )
	{
		var aRow = [];
		for ( var iCol = 0; iCol < iColumnCount; iCol++ )
		{
			aRow.push( oDataStore.getCell( iRow, iCol ).valueIndex );
		}
		aRows.push( aRow );
	}

	return {
		columns : aColumns,
		rows : aRows
	};
};

DataStoreUtils.filterByColumnValueIndex = function( oJson, iColumnIndex, iValueIndex )
{
	var aRows = [];
	for ( var iRow = 0; iRow < oJson.rows.length; iRow++ )
	{
		var aRow = oJson.rows[iRow];
		if ( aRow[iColumnIndex] == iValueIndex )
		{
			aRows.push( aRow );
			break;
		}
	}
	return {
		columns : oJson.columns,
		rows : aRows
	};
};

DataStoreUtils.filterByColumnValueIndexes = function( oJson, iColumnIndex, oValueIndexes )
{
	return {
		columns : oJson.columns,
		rows : oJson.rows.filter( function( aRow ) { return oValueIndexes.has( aRow[iColumnIndex] ) } )
	};
};

DataStoreUtils.filterToUniqueRows = function( oJson, iColumnIndex )
{
	var oValueIndexes = new Set();
	return {
		columns : oJson.columns,
		rows : oJson.rows.filter( function( aRow ) {
			if ( oValueIndexes.has( aRow[iColumnIndex] ) )
			{
				return false;
			}
			oValueIndexes.add( aRow[iColumnIndex] );
			return true;
		} )
	};
};

return DataStoreUtils;
});