Source Code Cross Referenced for Command.java in  » GIS » udig-1.1 » net » refractions » udig » project » command » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » udig 1.1 » net.refractions.udig.project.command 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         *    uDig - User Friendly Desktop Internet GIS client
03:         *    http://udig.refractions.net
04:         *    (C) 2004, Refractions Research Inc.
05:         *
06:         *    This library is free software; you can redistribute it and/or
07:         *    modify it under the terms of the GNU Lesser General Public
08:         *    License as published by the Free Software Foundation;
09:         *    version 2.1 of the License.
10:         *
11:         *    This library is distributed in the hope that it will be useful,
12:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14:         *    Lesser General Public License for more details.
15:         *
16:         */
17:        package net.refractions.udig.project.command;
18:
19:        import org.eclipse.core.runtime.IProgressMonitor;
20:
21:        /**
22:         * A MapCommand in uDig describes an action that modifies the system's model.
23:         * <p>
24:         * Commands are single fire objects. They cannot be used more than once. This is to allow undoable
25:         * commands to be a normal command, not a special case command.
26:         * </p>
27:         * <p>
28:         * <p>
29:         * Commands normally have factories associated with them, but they are also prototypes. The copy
30:         * method returns a new MapCommand without the undo data. The new MapCommand can safely be executed
31:         * with no negative side-effects.
32:         * </p>
33:         * 
34:         * @see net.refractions.udig.project.command.factory.NavigationCommandFactory A set of possible command
35:         *      categories are: zoom, pan, cut, paste, addVertex, etc.. Most commands are associated with
36:         *      tool whose job is to construct the commands. A MapCommand object describes an concrete
37:         *      change, for example: setBBox(0,0,1,1); setBBox(2,2,3,3) would be a seperate object.
38:         * @author jeichar
39:         */
40:        public interface Command {
41:            /**
42:             * The method that performs the work of the command.
43:             * <p>
44:             * Run is called by UDIG when the command is received. Commands are run in a seperate thread.
45:             * </p>
46:             * 
47:             * @param monitor A progress monitor used by the command to report on its internal state. API
48:             *        how is this associated with a Thread? is it a Thread?
49:             * @throws Exception
50:             */
51:            public void run(IProgressMonitor monitor) throws Exception;
52:
53:            /**
54:             * Instantiates a new copy of the command that will operate in the same manner as the original
55:             * command. API isn't this cloneable?
56:             * 
57:             * @return A copy of the current command. The new command must run the same way as the current
58:             *         object.
59:             *         <p>
60:             *         If the current command has already executed it cannot be used again, but a copy may
61:             *         because a copy should contain none of the state side-effect that execution has on a
62:             *         command
63:             *         </p>
64:             * @deprecated
65:             */
66:            public Command copy();
67:
68:            /**
69:             * Returns the name of the MapCommand
70:             * 
71:             * @return The name of the command.
72:             */
73:            public String getName();
74:
75:        }
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