Bug 314631 Cann't get correct default values for parameters that with non-constant default value expressions
Steps to reproduce: 1. create a report with a scalar parameter that has non-constant default value expression such as BirtDateTime.today() 2. setup a project to get the default values of the parameter in BIRT runtime Eg. IReportEngine engine = createReportEngine( ); IRunnable runnable = engine.openReportDesign( REPORT_DESIGN ); IGetParamaterDefinitionTask task = engine.createGetParameterDefinitionTask( runnable ); HashMap result = task.getDefaultValues(); Expect result: The result map contains a parameter name and default value pair in which the default value is a Date instance of today. Actural result: The default value is null.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/GetParameterDefinitionTask.java
{
			visitor.apply( paramSlot.get( i ) );
			assert ( visitor.currentElement != null );
			param = (IParameterDefnBase) visitor.currentElement;
			assert ( param.getName( ) != null );
			parameters.add( param );
		}
		
		if ( includeParameterGroups )
			return parameters;
		else
			return flattenParameter( parameters );
	}
	
	/**
	 * Puts all the report parameters including those appear inside parameter
	 * groups to the <code>allParameters</code> object.
	 * 
	 * @param params
	 *            A collection of parameters and parameter groups.
	 */
	protected ArrayList flattenParameter( ArrayList params )
	{
		assert params != null;
		IParameterDefnBase param;
		ArrayList allParameters = new ArrayList( );
		for ( int n = 0; n < params.size( ); n++ )
		{
			param = (IParameterDefnBase) params.get( n );
			if ( param.getParameterType( ) == IParameterDefnBase.PARAMETER_GROUP