Bug 210507 Enhance Report engine to support multiple view
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
*            map rule in DE.
	 * @return map rule in ENGINE.
	 */
	protected MapRuleDesign createMapRule( MapRuleHandle handle,
			String defaultStr )
	{
		boolean isListStyle = ModuleUtil.isListStyleRuleValue( handle );
		MapRuleDesign rule = new MapRuleDesign( );
		if ( isListStyle )
		{
			rule.setExpression( handle.getOperator( ), handle.getValue1List( ) );
		}
		else
		{
			rule.setExpression( handle.getOperator( ), handle.getValue1( ),
					handle.getValue2( ) );
		}
		String displayText = handle.getDisplay( );
		rule.setDisplayText( handle.getDisplayKey( ), displayText == null
				? "" 
				: displayText );
		String testExpr = handle.getTestExpression( );
		if ( testExpr != null && testExpr.length( ) > 0 )
		{
			rule.setTestExpression( testExpr );
		}
		else if ( ( defaultStr != null ) && defaultStr.length( ) > 0 )
		{
			rule.setTestExpression( defaultStr );
		}