public class SaveHandler implements Observer{
	@Inject 
	MApplication application;
	
	@Inject
	private EModelService modelService;
	
	@CanExecute
	public boolean canExecute() {
		return ((MyProject.getFilename() != null) && MyProject.isModelDirty());
	}
	

	@Execute
	public Boolean execute() {


		if (canExecute() == true) // test en principe inutile
		{
			// ici le processus de sauvegarde du fichier
			MyProject.setDirty(false);
		}

		return Boolean.TRUE;
	}
	
	@PostConstruct
	public void register() 
	{
		ModelProvider.INSTANCE.addObserver(this);
	}


	@Override
	public void update(Observable o, Object arg) {
             // here i would like to change the enable state of my command
		MUIElement item = modelService.find("MyProject.handleditem.trimbar.top.save", application);
    	ToolItem toolItem= (ToolItem)(item.getWidget());
		toolItem.setEnabled(((ModelProvider)o).isModified());;
	}

	@PreDestroy
	public void unregister(MApplication application, EModelService service) 
	{
		ModelProvider.INSTANCE.deleteObserver(this);
	}
}