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/driver/DimensionAxis.java
}
			valueSet.add( this.rs.getLevelKeyValue( levelIndex )[ this.rs.getLevelKeyColCount( levelIndex )-1] );
		}
		
		final int sortType = this.rs.getSortType( levelIndex );
		Object[] value = valueSet.toArray( );
		Arrays.sort( value, new Comparator( ) {
			public int compare( final Object arg0, final Object arg1 )
			{
				if ( sortType == IDimensionSortDefn.SORT_ASC
						|| sortType == IDimensionSortDefn.SORT_UNDEFINED )
					return ( (Comparable) arg0 ).compareTo( arg1 );
				else
					return ( (Comparable) arg0 ).compareTo( arg1 ) * -1;
			}
		} );
		Vector v = new Vector( );
		v.addAll( Arrays.asList( value ) );
		return v;
	}
	
	/**
	 * 
	 * @return
	 */
	public Vector getDisctinctValue( )
	{
		return this.valueObjects;
	}