org.eclipse.emf.common.command
Class UnexecutableCommand

java.lang.Object
  |
  +--org.eclipse.emf.common.command.AbstractCommand
        |
        +--org.eclipse.emf.common.command.UnexecutableCommand

All Implemented Interfaces:

Command

public class UnexecutableCommand

extends AbstractCommand

A singleton INSTANCE that cannot execute.

Field Summary

static UnexecutableCommand

INSTANCE The one instance of this object.

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

description, isExecutable, isPrepared, label

Method Summary

boolean	canExecute() Returns false.
boolean	canUndo() Returns false.
void	execute() Throws an exception if it should ever be called.
void	redo() Throws an exception if it should ever be called.

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

chain, dispose, getAffectedObjects, getDescription, getLabel, getResult, prepare, setDescription, setLabel, toString, undo

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final UnexecutableCommand INSTANCE

The one instance of this object.

Method Detail

canExecute

public boolean canExecute()

Returns false.

Overrides:

canExecute in class AbstractCommand

Returns:

false.

execute

public void execute()

Throws an exception if it should ever be called.

Throws:

UnsupportedOperationException - always.

canUndo

public boolean canUndo()

Returns false.

Overrides:

canUndo in class AbstractCommand

Returns:

false.

redo

public void redo()

Throws an exception if it should ever be called.

Throws:

UnsupportedOperationException - always.