| <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> |
| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> |
| <meta name="Author" content="IBM"> |
| <meta name="GENERATOR" content="Mozilla/4.5 [en] (WinNT; I) [Netscape]"> |
| <title>Package-level Javadoc</title> |
| </head> |
| <body> |
| Classes for the creation of operations which can be added to an operations |
| history to be undone and redone. |
| <h2> |
| Package Specification</h2> |
| An <b>undoable operation</b> is unit of work that can be executed, undone, and redone. |
| It can be added to an <b>operation history</b> so that clients can provide |
| undo and redo support for the history. Operations may be assigned one or more |
| <b>undo contexts</b> which can be used to filter the available operations |
| in a history. Clients may choose to provide undo and redo access to all operations |
| in a history or only a certain context in that history. In this way, support for |
| global undo or a localized/filtered undo can be provided. 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, contexts, histories, and |
| approvers. |
| </body> |
| </html> |
