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javax.swing.undo

Interface StateEditable

public interface StateEditable
The interface for objects whose state can be undone or redone by a StateEdit action.

The following example shows how to write a class that implements this interface. 

 class Foo
   implements StateEditable
 {
   private String name;

   public void setName(String n) { name = n; }

   public void restoreState(Hashtable h)
   {
     if (h.containsKey("name"))
       setName((String) h.get("name"));
   }

   public void storeState(Hashtable s)
   {
     s.put("name", name);
   }
 }
See Also:
StateEdit

Field Summary

static String
RCSID
The ID of the Java source file in Sun’s Revision Control System (RCS).

Method Summary

void
restoreState(Hashtable state)
Performs an edit action, taking any editable state information from the specified hash table.
void
storeState(Hashtable state)
Stores any editable state information into the specified hash table.

Field Details

RCSID

public static final String RCSID
The ID of the Java source file in Sun’s Revision Control System (RCS). This certainly should not be part of the API specification. But in order to be API-compatible with Sun’s reference implementation, GNU Classpath also has to provide this field and match its value. The value used here has been in every JDK release at least from 1.2 to 1.5.
Field Value:
"$Id: StateEditable.java,v 1.2 1997/09/08 19:39:08 marklin Exp $"

Method Details

restoreState

public void restoreState(Hashtable state)
Performs an edit action, taking any editable state information from the specified hash table.

Note to implementors of this interface: To increase efficiency, the StateEdit class StateEdit.removeRedundantState() removes redundant state information. Therefore, implementations of this interface must be prepared for the case where certain keys were stored into the table by storeState(Hashtable), but are not present anymore when the restoreState method gets called.

Parameters:
state - a hash table containing the relevant state information.

storeState

public void storeState(Hashtable state)
 Stores any editable state information into the specified hash
 table.

Parameters:
state - a hash table for storing relevant state
information.
StateEditable.java -- Interface for collaborating with StateEdit.
   Copyright (C) 2002, 2003, 2006, Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
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WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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combination.

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permission to link this library with independent modules to produce an
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