Bug 181121 Model should provide utility method for cube to get correspond dimension key.
In model cube handle, the relation of cube data set and dimension data sets are managed by a series of dimension condition handles.We need model to add utility method so that we can easily get corresponding dimension data set column names according to given cube dimension keys.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/MemberRef.java
}
			}
		}
		
		
		
		
		
		switch ( refType )
		{
			case PROPERTY :
			case PROPERTY_MEMBER_LISTn :
				return struct;
			case PROPERTY_MEMBER :
				return struct.getLocalProperty( module, member[0] );
			case PROPERTY_MEMBER_MEMBER :
			case PROPERTY_MEMBER_LISTn_MEMBER :
				return struct.getLocalProperty( module, member[1] );
			default :
			{
				assert false;
				return null;
			}
		}
	}
	/**
	 * Returns the definition of the property portion of the reference.
	 * 
	 * @return the property definition
	 */