All Known Subinterfaces:

DataTypeArchive, DataTypeManagerDomainObject, Program, UndoableDomainObject

All Known Implementing Classes:

DataTypeArchiveDB, DomainObjectAdapterDB, ProgramDB
```
public interface Undoable
```
Objects that implement Undoable have the ability to "remember" some number of stable states that are created as operations are performed upon them. The object then provides methods for "undoing" to a previous state or "redoing" to a later state.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addTransactionListener(TransactionListener listener)`	Adds the given transaction listener to this domain object
`boolean`	`canRedo()`	Returns true if there is a later state to "redo" to.
`boolean`	`canUndo()`	Returns true if there is a previous state to "undo" to.
`void`	`clearUndo()`	Clear all undoable/redoable transactions
`java.lang.String`	`getRedoName()`	Returns a description of the change that would be "redone".
`java.lang.String`	`getUndoName()`	Returns a description of the chanage that would be "undone".
`void`	`redo()`	Returns to a latter state that exists because of an undo.
`void`	`removeTransactionListener(TransactionListener listener)`	Removes the given transaction listener from this domain object.
`void`	`undo()`	Returns to the previous state.

- Method Detail
  - canUndo
```
boolean canUndo()
```
    Returns true if there is a previous state to "undo" to.
  - canRedo
```
boolean canRedo()
```
    Returns true if there is a later state to "redo" to.
  - clearUndo
```
void clearUndo()
```
    Clear all undoable/redoable transactions
  - undo
```
void undo()
   throws java.io.IOException
```
    Returns to the previous state. Normally, this will cause the current state to appear on the "redo" stack. This method will do nothing if there are no previous states to "undo".
    
    Throws:
    
    java.io.IOException - if an IO error occurs
  - redo
```
void redo()
   throws java.io.IOException
```
    Returns to a latter state that exists because of an undo. Normally, this will cause the current state to appear on the "undo" stack. This method will do nothing if there are no latter states to "redo".
    
    Throws:
    
    java.io.IOException - if an IO error occurs
  - getUndoName
```
java.lang.String getUndoName()
```
    Returns a description of the chanage that would be "undone".
  - getRedoName
```
java.lang.String getRedoName()
```
    Returns a description of the change that would be "redone".
  - addTransactionListener
```
void addTransactionListener(TransactionListener listener)
```
    Adds the given transaction listener to this domain object
    
    Parameters:
    
    listener - the new transaction listener to add
  - removeTransactionListener
```
void removeTransactionListener(TransactionListener listener)
```
    Removes the given transaction listener from this domain object.
    
    Parameters:
    
    listener - the transaction listener to remove

Interface Undoable

Method Summary

Method Detail

canUndo

canRedo

clearUndo

undo

redo

getUndoName

getRedoName

addTransactionListener

removeTransactionListener