org.eclipse.emf.mapping.command
Class SetOverrideCommand

java.lang.Object
  org.eclipse.emf.common.command.AbstractCommand
      org.eclipse.emf.mapping.command.SetOverrideCommand

All Implemented Interfaces:

Command

public class SetOverrideCommand
extends AbstractCommand

This command overrides the SetCommand to additionally unmap the removed object and map the new object.

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.emf.common.command.AbstractCommand

AbstractCommand.NonDirtying

Field Summary

protected Command	mapCommand This keeps track of the set mapping command(s) used to implement this command.
protected MappingDomain	mappingDomain This keeps track of the mapping domain in which the command operates.
protected SetCommand	setCommand This keeps track of the SetCommand we're overriding

Fields inherited from class org.eclipse.emf.common.command.AbstractCommand

description, isExecutable, isPrepared, label

Constructor Summary

SetOverrideCommand(MappingDomain domain, SetCommand setCommand)
This creates a command instance that removes, unmaps the removed object and then adds and maps the new object.

Method Summary

void	dispose() Called to indicate that the command will never be used again.
void	execute() Performs the command activity required for the effect.
java.util.Collection<?>	getAffectedObjects() Returns an empty list.
java.util.Collection<?>	getResult() Returns an empty list.
protected boolean	prepare() Called at most once in AbstractCommand.canExecute() to give the command an opportunity to ready itself for execution.
void	redo() Performs the command activity required to redo the effect after undoing the effect.
java.lang.String	toString() This gives an abbreviated name using this object's own class' name, without package qualification, followed by a space separated list of field:value pairs.
void	undo() Throws a runtime exception.

Methods inherited from class org.eclipse.emf.common.command.AbstractCommand

canExecute, canUndo, chain, getDescription, getLabel, setDescription, setLabel

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

mappingDomain

protected MappingDomain mappingDomain

This keeps track of the mapping domain in which the command operates.

setCommand

protected SetCommand setCommand

This keeps track of the SetCommand we're overriding

mapCommand

protected Command mapCommand

This keeps track of the set mapping command(s) used to implement this command.

Constructor Detail

SetOverrideCommand

public SetOverrideCommand(MappingDomain domain,
                          SetCommand setCommand)

This creates a command instance that removes, unmaps the removed object and then adds and maps the new object.

Method Detail

prepare

protected boolean prepare()

Description copied from class: AbstractCommand

Called at most once in AbstractCommand.canExecute() to give the command an opportunity to ready itself for execution. The returned value is stored in AbstractCommand.canExecute(). In other words, you can override this method to initialize and to yield a cached value for the all subsequent calls to canExecute.

Overrides:

prepare in class AbstractCommand

Returns:

whether the command is executable.

execute

public void execute()

Description copied from interface: Command

Performs the command activity required for the effect. The effect of calling execute when canExecute returns false, or when canExecute hasn't been called, is undefined.

undo

public void undo()

Description copied from class: AbstractCommand

Throws a runtime exception.

Specified by:

undo in interface Command

Overrides:

undo in class AbstractCommand

redo

public void redo()

Description copied from interface: Command

Performs the command activity required to redo the effect after undoing the effect. The effect, if any, of calling redo before undo is called is undefined. Note that if you implement redo to call execute then any derived class will be restricted by that decision also.

dispose

public void dispose()

Description copied from interface: Command

Called to indicate that the command will never be used again. Calling any other method after this one has undefined results.

Specified by:

dispose in interface Command

Overrides:

dispose in class AbstractCommand

getResult

public java.util.Collection<?> getResult()

Description copied from class: AbstractCommand

Returns an empty list.

Specified by:

getResult in interface Command

Overrides:

getResult in class AbstractCommand

Returns:

an empty list.

getAffectedObjects

public java.util.Collection<?> getAffectedObjects()

Description copied from class: AbstractCommand

Returns an empty list.

Specified by:

getAffectedObjects in interface Command

Overrides:

getAffectedObjects in class AbstractCommand

Returns:

an empty list.

toString

public java.lang.String toString()

This gives an abbreviated name using this object's own class' name, without package qualification, followed by a space separated list of field:value pairs.

Overrides:

toString in class AbstractCommand

Returns:

string representation.