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
ParameterHelper[] parameterHelpers = new ParameterHelper[parameterCount];
		for ( int i = 0; i < parameterCount; i++ )
		{
			AbstractScalarParameterHandle parameter = (AbstractScalarParameterHandle) parameters
					.get( i );
			parameterHelpers[i] = new ParameterHelper( parameter, ulocale,
					timeZone );
		}
		return parameterHelpers;
	}
	
	private Collection getChoicesFromParameterGroup(
			AbstractScalarParameterHandle parameter, Object[] groupKeyValues )
	{
		assert isCascadingParameter( parameter );
		CascadingParameterGroupHandle parameterGroup = getCascadingGroup( parameter );
		IResultIterator iterator = getResultSetOfCascadingGroup( parameterGroup );
		if ( iterator == null )
		{
			return Collections.EMPTY_LIST;
		}
		return populateToList( iterator, parameter, new ParameterGroupFilter(
				groupKeyValues, parameterGroup ) );
	}
	private interface SelectionFilter
	{
		boolean accept( IResultIterator iterator ) throws BirtException;
	}
	
	private class ParameterGroupFilter implements SelectionFilter