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| Classes for the creation of undoable operations which can be added to an operations |
| history and later be undone and redone. |
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| Package Specification</h2> |
| An <b>undoable operation</b> is a unit of work that can be executed, undone, and redone. |
| Operations can be added to an <b>operation history</b> so that they can later be |
| undone and redone according to the undo model for an application. Operations may be |
| assigned one or more <b>undo contexts</b> which can be used to filter the available |
| operations for undo or redo in the operation history. Clients may choose to provide |
| undo and redo function for all operations in a history, or only for a particular |
| undo context in that history. Operation histories may be configured with an |
| <b>operation approver</b> so that applications can enforce any desired undo model, |
| such as strict linear (LIFO) undo. This package provides the definition and a |
| basic implementation for operations, undo contexts, histories, and operation |
| approvers. |
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