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The command above assumes that the edit part for a particular model object stays constant over time This is an invalid assumption because if a model object is removed from the model, the edit part referencing that model is disposed If the operation that removed the model object is undone, it will add that same model object back into the model, but a new edit part will be associated with that same model object If this happens then the operation above will no longer be undoable One way to fix this problem is to cache the model object and FavoritesManagerEditPart (which stays constant throughout the life of the editor) rather than the edit part, and then lookup the edit part each time it is needed

Another problem that we have had to solve in several contexts is reading homework grades into a vector There is a problem in designing the behavior of such a function: It needs to return two values at once One value is, of course, the homework grades that it read The other is an indication of whether the attempted input was successful There is no direct way to return more than one value from a function One indirect way to do so is to give the function a parameter that is a reference to an object in which it is to place one of its results This strategy is common for functions that read input, so we'll use it Doing so will make our function look like this:

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public class AdjustConstraintCommand extends Command { private FavoritesManagerEditPart manager; private Object model; private Rectangle newBounds, oldBounds; public AdjustConstraintCommand( GraphicalEditPart editPart, Rectangle contraint) { thismanager = (FavoritesManagerEditPart) editPartgetParent(); thismodel = editPartgetModel(); thisnewBounds = contraint; thisoldBounds = new Rectangle(editPartgetFigure()getBounds()); setLabel(getOp(oldBounds, newBounds) + " " + getName(editPart)); } getOp(), getName() and execute() here from prior code listing public void redo() { GraphicalEditPart editPart = getEditPart(); if (editPart == null) return; managersetLayoutConstraint( editPart, editPartgetFigure(), newBounds); }

public void undo() { GraphicalEditPart editPart = getEditPart(); if (editPart == null) return; managersetLayoutConstraint( editPart, editPartgetFigure(), oldBounds); } private GraphicalEditPart getEditPart() { for (Iterator< > iter = managergetChildren()iterator(); iterhasNext();) { GraphicalEditPart editPart = (GraphicalEditPart) iternext(); if (modelequals(editPartgetModel())) return editPart; } return null; }

// read homework grades from an input stream into a vector<double> istream& read_hw(istream& in, vector<double>& hw) { // we must fill in this part return in; }

You might expect this program to print out the date twice, but it prints out null the first time because the method m is invoked by the constructor Super() before the constructor Sub() has a chance to initialize the date field Note that this program observes a final field in two different states The Cloneable and Serializable interfaces present special difficulties when designing for inheritance It is generally not a good idea for a class designed for inheritance to implement either of these interfaces, as they place a substantial burden on programmers who extend the class There are, however, special actions that you can take to allow subclasses to implement these interfaces without mandating that they do so These actions are described in Item 10 and Item 54 If you do decide to implement Cloneable or Serializable in a class designed for inheritance, you should be aware that because the clone and readObject methods behave a lot like constructors, a similar restriction applies: Neither clone nor readObject may invoke an overridable method, directly or indirectly In the case of the readObject method, the overriding method will run before the subclass's state has been deserialized In the case of the clone method, the overriding method will run before the subclass's clone methods has a chance to fix the clone's state In either case, a program failure is likely to follow In the case of the clone method, the failure can do damage to the object being cloned as well as to the clone itself Finally, if you decide to implement Serializable in a class designed for inheritance and the class has a readResolve or writeReplace method, you must make the readResolve or

Yet another approach would be to push the location and size information into the model If this were the case, we could modify the model and ignore the edit parts, knowing that the information would flow to the edit parts via the model change events If it is not possible to modify the underlying model, consider storing this information in a new model layered on top of the underlying model

GEF tracks model changes using GEF commands, but to undo a command, we must hook GEF into the Eclipse edit framework (see Figure 20 6) Hooking the undo/redo commands requires an editor contributor, while hooking the delete command can be accomplished using the new command infrastructure

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