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
if ( obj == this )
			{
				return true;
			}
			if ( !(obj instanceof CascadingParameterSelectionChoice ) )
			{
				return false;
			}
			CascadingParameterSelectionChoice choice = (CascadingParameterSelectionChoice)obj;
			if ( value == null )
			{
				return choice.value == null;
			}
			return value.equals( choice.value );
		}
	}
	
	static class ChoiceListCache
	{
		private ParameterHelper[] parameterHelpers;
		private Map[] cachedLists;
		private Collection root;
		private int parameterCount;
		
		public ChoiceListCache( ParameterHelper[] parameterHelpers )
		{
			this.parameterHelpers = parameterHelpers;
			this.parameterCount = parameterHelpers.length;
			cachedLists = new Map[parameterCount - 1];
			for ( int i = 0; i < cachedLists.length; i++ )