Bug 161738 [Undo] - API - promote ability to quietly compute status to operations API
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/AbstractWorkspaceOperation.java
* override this method to more specifically describe their modifications to
	 * the workspace.
	 * 
	 * @param factory
	 *            the factory to update
	 * @param operation
	 *            an integer indicating whether the change is part of an
	 *            execute, undo, or redo
	 * @return a boolean indicating whether the factory was updated.
	 */
	protected boolean updateResourceChangeDescriptionFactory(
			IResourceChangeDescriptionFactory factory, int operation) {
		return false;
	}
	/**
	 * Return an error status describing an invalid operation using the provided
	 * message.
	 * 
	 * @param message
	 *            the message to be used in the status, or <code>null</code>
	 *            if a generic message should be used
	 * @return the error status
	 */
	protected IStatus getErrorStatus(String message) {
		String statusMessage = message;
		if (statusMessage == null) {
			statusMessage = NLS
					.bind(
							UndoMessages.AbstractWorkspaceOperation_ErrorInvalidMessage,
							getLabel());