Bug 283442 [UI] Refactor the rendering class names
In order to bring the model closer to the way in which we talk about it we should re-factor it to remove references to 'factory'. For now the re-factoring will to replace 'PartRenderer' with 'PartRenderingEngine' and to replace '<xxx>Factory' with '<xxx>Renderer'. Post 0.9 we expect to change these again but this will make the initial story clearer.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/HandledContributionItem.java
return c;
	}
	protected boolean canExecuteItem(Display display) {
		final ParameterizedCommand parmCmd = model.getWbCommand();
		if (parmCmd == null) {
			return false;
		}
		IEclipseContext context = getFocusContext(display);
		EHandlerService hs = (EHandlerService) context
				.get(EHandlerService.class.getName());
		if (hs == null) {
			return true;
		}
		return hs.canExecute(parmCmd);
	}
	protected Object executeItem(Display display) {
		final ParameterizedCommand parmCmd = model.getWbCommand();
		if (parmCmd == null) {
			return false;
		}
		IEclipseContext context = getFocusContext(display);
		EHandlerService hs = (EHandlerService) context
				.get(EHandlerService.class.getName());
		if (hs == null) {
			return null;
		}
		return hs.executeHandler(parmCmd);
	}
}