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.

Nested Class Summary

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

AbstractCommand.NonDirtying

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.

Specified by:

canExecute in interface Command

Overrides:

canExecute in class AbstractCommand

Returns:

false.

execute

public void execute()

Throws an exception if it should ever be called.

Throws:

java.lang.UnsupportedOperationException - always.

canUndo

public boolean canUndo()

Returns false.

Specified by:

canUndo in interface Command

Overrides:

canUndo in class AbstractCommand

Returns:

false.

redo

public void redo()

Throws an exception if it should ever be called.

Throws:

java.lang.UnsupportedOperationException - always.