Bug 209450 [regression]Duplicate values display in Cascading parameter list[0705]
Descripption: Duplicate values display in Cascading parameter list Build number:2.3.0.v20071112 Steps to reproduce: 1. New sample data source and dataset from CUSTOMERS. 2. New a cascading parameter from COUNTRY, STATE AND CITY fields. 3. Preview. Expected result: Values in three parameter list aren't duplicated. Actual result: Duplicate values show in parameter list. Error log:n/a
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/GetParameterDefinitionTask.java
ValueGroup valueGroup = new ValueGroup( values, parameterIndex );
			Map cache = cachedLists[parameterIndex];
			return cache.containsKey( valueGroup );
		}
		
		public Collection getChildren( Object[] values, int parameterIndex )
		{
			if ( parameterIndex == parameterCount - 1 )
			{
				return Collections.EMPTY_LIST;
			}
			ValueGroup valueGroup = new ValueGroup( values, parameterIndex );
			Map cache = cachedLists[parameterIndex];
			Collection parent = (Collection)cache.get( valueGroup );
			if ( parent == null )
			{
				parent = parameterHelpers[parameterIndex + 1]
						.createSelectionCollection( );
				cache.put( valueGroup, parent );
			}
			return parent;
		}
		
		public Collection getRoot( )
		{
			return root;
		}
	}
	
	static class ValueGroup