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
{
				cachedLists[i] = new HashMap( );
			}
			root = parameterHelpers[0].createSelectionCollection( );
		}
		
		public Collection getParent( Object[] values, int parameterIndex )
		{
			if ( parameterIndex == 0 )
			{
				return root;
			}
			int parentIndex = parameterIndex - 1;
			ValueGroup valueGroup = new ValueGroup( values, parentIndex );
			Map cache = cachedLists[parentIndex];
			Collection parent = (Collection)cache.get( valueGroup );
			if ( parent == null )
			{
				parent = parameterHelpers[parameterIndex]
						.createSelectionCollection( );
				cache.put( valueGroup, parent );
			}
			return parent;
		}
		public boolean containsChildren( Object[] values, int parameterIndex )
		{
			if ( parameterIndex == parameterCount - 1 )
			{
				return false;
			}