Bug 211710 [Regression] Data of cascading parameters in the report extended from the library can not be selected from the drop-down list when preview [01]
Description: Data of cascading parameters in the report extended from the library can not be selected from the drop-down list when preview. Build number: 2.2.2.v20071203-0630 Steps to reproduce: 1. New a Library with cascading parameters. 2. New a report and extend the cascading parameters from the library and preview. Expected result: Values can be selected from the drop-down list. Actual result: Values can not be selected from the drop-down list. Error log: N/A
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/GetParameterDefinitionTask.java
* 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
					|| param.getParameterType( ) == IParameterDefnBase.CASCADING_PARAMETER_GROUP )
			{
				allParameters
						.addAll( flattenParameter( ( (IParameterGroupDefn) param )
								.getContents( ) ) );
			}
			else
			{
				allParameters.add( param );
			}
		}
		
		return allParameters;
	}
	
	class ParameterBinding