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
log.log( Level.WARNING, ex.getMessage( ), ex );
			executionContext.addException( parameter, ex );
		}
		return choices;
	}
	private DataRequestSession createDataSession( DataSetHandle dataSet ) throws EngineException
	{
		IDataEngine dataEngine = executionContext.getDataEngine( );
		DataRequestSession dteSession = getDataSession();
		
		dataEngine.defineDataSet(dataSet);
		return dteSession;
	}
	
	private QueryDefinition createQueryDefinition( DataSetHandle dataSet )
	{
		QueryDefinition queryDefn = new QueryDefinition( );
		queryDefn.setDataSetName( dataSet.getQualifiedName( ) );
		queryDefn.setAutoBinding( true );
		return queryDefn;
	}
	
	private IResultIterator executeQuery( DataRequestSession dteSession,
			QueryDefinition queryDefn ) throws BirtException
	{
		IPreparedQuery query = dteSession.prepare( queryDefn );
		IQueryResults result = (IQueryResults)dteSession.execute( query, null,
				executionContext.getScriptContext( ) );
		return result.getResultIterator( );
	}