ModelCommand (ArgoUML Javadoc for ArgoUML Module Developers)

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org.argouml.model
Class ModelCommand

java.lang.Object
  org.argouml.model.ModelCommand

Direct Known Subclasses:: DummyModelCommand

public abstract class ModelCommand
extends java.lang.Object
extends java.lang.Object

A command to record the state of an object before an undoable change.

The model implementation should create a ModelCommand for any undoable operation performed. Any mutator method should normally be undoable except loading a model from file.

Constructor Summary
`ModelCommand()`

Method Summary
`abstract java.lang.Object`	`execute()` Execute this command.
`abstract boolean`	`isRedoable()` Determine whether the command can be redone once undone.
`abstract boolean`	`isUndoable()` Determine whether the command can be undone.
`abstract void`	`undo()` Undo this command.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

ModelCommand

public ModelCommand()

Method Detail

execute

public abstract java.lang.Object execute()

Execute this command.

Returns:: any result generated by this command

isUndoable

public abstract boolean isUndoable()

Determine whether the command can be undone.

Returns:: true if the command can be undone

isRedoable

public abstract boolean isRedoable()

Determine whether the command can be redone once undone.

Returns:: true if the command can be redone

undo

public abstract void undo()

Undo this command.