Bug 126414 [Commands] handlers: Provide help context ids
For commands and handlers to replace actions, they need to be capable of providing help context identifiers. For an example, see OpenResourceHandler in org.eclipse.ui.ide. This help context id will need to be definable through XML and through code.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/CommandManager.java
final Object object = listeners[i];
					if (object instanceof IExecutionListenerWithChecks) {
						final IExecutionListenerWithChecks listener = (IExecutionListenerWithChecks) object;
						listener.notDefined(commandId, exception);
					}
				}
			}
		}
		public void notEnabled(String commandId, NotEnabledException exception) {
			if (executionListeners != null) {
				final Object[] listeners = executionListeners.getListeners();
				for (int i = 0; i < listeners.length; i++) {
					final Object object = listeners[i];
					if (object instanceof IExecutionListenerWithChecks) {
						final IExecutionListenerWithChecks listener = (IExecutionListenerWithChecks) object;
						listener.notEnabled(commandId, exception);
					}
				}
			}
		}
		public final void notHandled(final String commandId,
				final NotHandledException exception) {
			if (executionListeners != null) {
				final Object[] listeners = executionListeners.getListeners();
				for (int i = 0; i < listeners.length; i++) {
					final Object object = listeners[i];
					if (object instanceof IExecutionListener) {
						final IExecutionListener listener = (IExecutionListener) object;
						listener.notHandled(commandId, exception);
					}