Bug 182895 Support sort on Level attribute.
Currently in OLAP engine we only support sort on level key value. We should go ahead to support sort on level attribute value.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/data/api/CubeQueryExecutorHelper.java
/*
	 * (non-Javadoc)
	 * @see org.eclipse.birt.data.engine.olap.data.api.ICubeQueryExcutorHelper#addJSFilter(org.eclipse.birt.data.engine.olap.util.filter.DimensionFilterEvalHelper)
	 */
	public void addJSFilter( IJSFilterHelper filterEvalHelper )
	{
		if ( filterEvalHelper.isAggregationFilter( ) == false )
		{
			String dimesionName = filterEvalHelper.getDimensionName( );
			List filterList = getDimensionJSFilterList( dimesionName );
			filterList.add( filterEvalHelper );
		}
		else
		{
			aggrFilterHelpers.add( filterEvalHelper );
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.data.engine.olap.data.api.ICubeQueryExcutorHelper#addJSFilter(java.util.List)
	 */
	public void addJSFilter( List filterEvalHelperList )
	{
		for ( int i = 0; i < filterEvalHelperList.size( ); i++ )
		{
			addJSFilter( (IJSFilterHelper) filterEvalHelperList.get( i ) );
		}