Bug 183733 Implement the IScriptOjectClassInfo to provide the class infromation to support the JS code assistant.
Engine should implement the IScriptObjectClassInfo interface to return the class information for script object.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/script/internal/TextItemScriptExecutor.java
ITextItem textItem = new TextItem( textItemHandle );
			if ( handleJS( textItem, textItemHandle.getOnPrepare( ), context )
					.didRun( ) )
				return;
			ITextItemEventHandler eh = getEventHandler( textItemHandle, context );
			if ( eh != null )
				eh.onPrepare( textItem, context.getReportContext( ) );
		} catch ( Exception e )
		{
			addException( context, e );
		}
	}
	public static void handleOnCreate( IContent content,
			ExecutionContext context )
	{
		try
		{
			ReportItemDesign textItemDesign = ( ReportItemDesign ) content
					.getGenerateBy( );
			ITextItemInstance textItem = null;
			if ( content instanceof TextContent )
				textItem = new TextItemInstance( ( ITextContent ) content,
						context );
			else if ( content instanceof ForeignContent )
				textItem = new TextItemInstance( ( IForeignContent ) content,
						context );
			if ( handleJS( textItem, textItemDesign.getOnCreate( ), context )
					.didRun( ) )
				return;
			ITextItemEventHandler eh = getEventHandler( textItemDesign, context );