01: /*
02: * uDig - User Friendly Desktop Internet GIS client http://udig.refractions.net (C) 2004,
03: * Refractions Research Inc. This library is free software; you can redistribute it and/or modify it
04: * under the terms of the GNU Lesser General Public License as published by the Free Software
05: * Foundation; version 2.1 of the License. This library is distributed in the hope that it will be
06: * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
07: * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
08: */
09: package net.refractions.udig.project.command;
10:
11: /**
12: * Provides a little introspection into the command stack. This is the read only interface to a command stack
13: * @author Jesse
14: * @since 0.3
15: */
16: public interface CommandStack {
17:
18: /**
19: * @return <code>true</code> if the last command can be undone.
20: */
21: public boolean canUndo();
22:
23: /**
24: * return <code>true</code> if a command is available to be redone.
25: */
26: public boolean canRedo();
27: }
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