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org.eclipse.emf.edit.command
Class AbstractOverrideableCommand

java.lang.Object
  org.eclipse.emf.common.command.AbstractCommand
      org.eclipse.emf.edit.command.AbstractOverrideableCommand

All Implemented Interfaces:

Command, OverrideableCommand

Direct Known Subclasses:

AddCommand, CopyToClipboardCommand, CreateCopyCommand, InitializeCopyCommand, MoveCommand, PasteFromClipboardCommand, RemoveCommand, ReplaceCommand, SetCommand, WrapperItemProvider.SimpleCopyCommand

public abstract class AbstractOverrideableCommand

extends AbstractCommand

implements OverrideableCommand

This is a convenient base class for classes that implement OverrideableCommand. Subclasses of AbstractOverrideableCommand should provide implementations of the doXxx methods (e.g., doExecute) from OverrideableCommand instead of the base command methods (e.g., execute), which have final implementations here.

Nested Class Summary

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

AbstractCommand.NonDirtying

Field Summary

protected EditingDomain	domain This is the editing doman in which this command operates.
protected Command	overrideCommand This is the command that overrides this command.

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

description, isExecutable, isPrepared, label

Constructor Summary

protected	AbstractOverrideableCommand(EditingDomain domain) This constructs an instance in this editing domain.
protected	AbstractOverrideableCommand(EditingDomain domain, String label) This constructs an instance with the given label and in this editing domain.
protected	AbstractOverrideableCommand(EditingDomain domain, String label, String description) This constructs an instance with the given label and description, in this editing domain.

Method Summary

boolean	canExecute() Returns whether the comamad is valid to execute.
boolean	canUndo() Returns whether the command can be undone.
void	dispose() Called to indicate that the command will never be used again.
boolean	doCanExecute() This is overrideable command's implementation of canExecute.
boolean	doCanUndo() This is overrideable command's implementation of canUndo.
void	doDispose() This is overrideable command's implementation of dispose.
abstract void	doExecute() This is overrideable command's implementation of execute.
Collection	doGetAffectedObjects() This is overrideable command's implementation of getAffectedObjects.
Collection	doGetChildrenToCopy()
String	doGetDescription() This is overrideable command's implementation of getDescription.
String	doGetLabel() This is overrideable command's implementation of getLabel.
Collection	doGetResult() This is overrideable command's implementation of getResult.
abstract void	doRedo() This is overrideable command's implementation of redo.
abstract void	doUndo() This is overrideable command's implementation of undo.
void	execute() Performs the command activity required for the effect.
Collection	getAffectedObjects() Returns the collection of things which this command wishes to present as the objects affected by the command.
Collection	getChildrenToCopy()
String	getDescription() Returns a string suitable to help describe the effect of this command.
EditingDomain	getDomain() This returns the editing domain that contains this.
String	getLabel() Returns a string suitable to represent the label that identifies this command.
Command	getOverride() This returns the command that overrides this command.
static EList	getOwnerList(EObject owner, EStructuralFeature feature)
Collection	getResult() Returns a collection of things which this command wishes to present as it's result.
void	redo() Performs the command activity required to redo the effect after undoing the effect.
void	setOverride(Command overrideCommand) This sets the command that overrides this command.
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() Performs the command activity required to undo the effects of a preceding execute (or redo).

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

chain, prepare, setDescription, setLabel

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.emf.common.command.Command

chain

Field Detail

domain

protected EditingDomain domain

This is the editing doman in which this command operates.

overrideCommand

protected Command overrideCommand

This is the command that overrides this command.

Constructor Detail

AbstractOverrideableCommand

protected AbstractOverrideableCommand(EditingDomain domain)

This constructs an instance in this editing domain.

AbstractOverrideableCommand

protected AbstractOverrideableCommand(EditingDomain domain,
                                      String label)

This constructs an instance with the given label and in this editing domain.

AbstractOverrideableCommand

protected AbstractOverrideableCommand(EditingDomain domain,
                                      String label,
                                      String description)

This constructs an instance with the given label and description, in this editing domain.

Method Detail

getDomain

public EditingDomain getDomain()

This returns the editing domain that contains this.

getOverride

public Command getOverride()

This returns the command that overrides this command.

Specified by:

getOverride in interface OverrideableCommand

setOverride

public void setOverride(Command overrideCommand)

This sets the command that overrides this command.

Specified by:

setOverride in interface OverrideableCommand

canExecute

public final boolean canExecute()

Description copied from interface: Command

Returns whether the comamad is valid to execute. The UnexecutableCommand.INSTANCE.canExecute() always returns false. This must be called before calling execute.

Specified by:

canExecute in interface Command

Overrides:

canExecute in class AbstractCommand

Returns:

whether the command can execute.

doCanExecute

public boolean doCanExecute()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of canExecute.

Specified by:

doCanExecute in interface OverrideableCommand

execute

public final 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.

Specified by:

execute in interface Command

doExecute

public abstract void doExecute()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of execute.

Specified by:

doExecute in interface OverrideableCommand

canUndo

public final boolean canUndo()

Description copied from interface: Command

Returns whether the command can be undone. The result of calling this before execute is well defined, but the result of calling this before calling canExecute is undefined, i.e., a command that returns false for canExecute may return true for canUndo, even though that is a contradiction.

Specified by:

canUndo in interface Command

Overrides:

canUndo in class AbstractCommand

Returns:

true.

doCanUndo

public boolean doCanUndo()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of canUndo.

Specified by:

doCanUndo in interface OverrideableCommand

undo

public final void undo()

Description copied from interface: Command

Performs the command activity required to undo the effects of a preceding execute (or redo). The effect, if any, of calling undo before execute or redo have been called, or when canUndo returns false, is undefined.

Specified by:

undo in interface Command

Overrides:

undo in class AbstractCommand

doUndo

public abstract void doUndo()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of undo.

Specified by:

doUndo in interface OverrideableCommand

redo

public final 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.

Specified by:

redo in interface Command

doRedo

public abstract void doRedo()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of redo.

Specified by:

doRedo in interface OverrideableCommand

getResult

public final Collection getResult()

Description copied from interface: Command

Returns a collection of things which this command wishes to present as it's result. The result of calling this before an execute or redo, or after an undo, is undefined.

Specified by:

getResult in interface Command

Overrides:

getResult in class AbstractCommand

Returns:

an empty list.

doGetResult

public Collection doGetResult()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of getResult.

Specified by:

doGetResult in interface OverrideableCommand

getAffectedObjects

public final Collection getAffectedObjects()

Description copied from interface: Command

Returns the collection of things which this command wishes to present as the objects affected by the command. Typically should could be used as the selection that should be highlighted to best illustrate the effect of the command. The result of calling this before an execute, redo, or undo is undefined. The result may be different after an undo than it is after an execute or redo, but the result should be the same (equivalent) after either an execute or redo.

Specified by:

getAffectedObjects in interface Command

Overrides:

getAffectedObjects in class AbstractCommand

Returns:

an empty list.

doGetAffectedObjects

public Collection doGetAffectedObjects()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of getAffectedObjects.

Specified by:

doGetAffectedObjects in interface OverrideableCommand

getLabel

public final String getLabel()

Description copied from interface: Command

Returns a string suitable to represent the label that identifies this command.

Specified by:

getLabel in interface Command

Overrides:

getLabel in class AbstractCommand

doGetLabel

public String doGetLabel()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of getLabel.

Specified by:

doGetLabel in interface OverrideableCommand

getDescription

public final String getDescription()

Description copied from interface: Command

Returns a string suitable to help describe the effect of this command.

Specified by:

getDescription in interface Command

Overrides:

getDescription in class AbstractCommand

doGetDescription

public String doGetDescription()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of getDescription.

Specified by:

doGetDescription in interface OverrideableCommand

dispose

public final 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

doDispose

public void doDispose()

Description copied from interface: OverrideableCommand

This is overrideable command's implementation of dispose.

Specified by:

doDispose in interface OverrideableCommand

getChildrenToCopy

public final Collection getChildrenToCopy()

doGetChildrenToCopy

public Collection doGetChildrenToCopy()

getOwnerList

public static EList getOwnerList(EObject owner,
                                 EStructuralFeature feature)

toString

public 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.