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
MessageConstants.PARAMETER_GROUP_ISNOT_FOUND_BY_GROUPNAME_EXCEPTION,
					parameterGroupName ) );
			return Collections.EMPTY_LIST;
		}
		SlotHandle parameters = parameterGroup.getParameters( );
		int parameterCount = parameters.getCount( );
		if ( DesignChoiceConstants.DATA_SET_MODE_SINGLE.equals( parameterGroup
				.getDataSetMode( ) ) )
		{
			
			IResultIterator resultIterator = getResultSetOfCascadingGroup( parameterGroup );
			if ( resultIterator == null )
			{
				return Collections.EMPTY_LIST;
			}
			Collection selectionTree = populateToSelectionTree( resultIterator,
					parameterGroup );
			close( resultIterator );
			return selectionTree;
		}
		else
		{
			ParameterHelper[] parameterHelpers = getParameterHelpers( parameterGroup );
			ChoiceListCache cache = new ChoiceListCache( parameterHelpers );
			assert( parameterCount > 0 );
			return getSelectionTree( parameters, parameterHelpers, cache,
					new Object[0] );
		}
	}
	private Collection getSelectionTree( SlotHandle parameters,