Source Code Cross Referenced for IHandler.java in  » IDE-Eclipse » ui-workbench » org » eclipse » ui » commands » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » ui workbench » org.eclipse.ui.commands 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*******************************************************************************
02:         * Copyright (c) 2003, 2005 IBM Corporation and others.
03:         * All rights reserved. This program and the accompanying materials
04:         * are made available under the terms of the Eclipse Public License v1.0
05:         * which accompanies this distribution, and is available at
06:         * http://www.eclipse.org/legal/epl-v10.html
07:         *
08:         * Contributors:
09:         *     IBM Corporation - initial API and implementation
10:         *******************************************************************************/package org.eclipse.ui.commands;
11:
12:        import java.util.Map;
13:
14:        /**
15:         * A handler is the pluggable piece of a command that handles execution. Each
16:         * command can have zero or more handlers associated with it (in general), of
17:         * which only one will be active at any given moment in time. When the command
18:         * is asked to execute, it will simply pass that request on to its active
19:         * handler, if any.
20:         * <p>
21:         * This interface is not intended to be extended by clients.
22:         * </p>
23:         * 
24:         * @since 3.0
25:         * @deprecated Please use the "org.eclipse.core.commands" plug-in instead.
26:         * @see org.eclipse.core.commands.IHandler
27:         */
28:        public interface IHandler {
29:
30:            /**
31:             * Registers an instance of <code>IHandlerListener</code> to listen for
32:             * changes to properties of this instance.
33:             * 
34:             * @param handlerListener
35:             *            the instance to register. Must not be <code>null</code>. If
36:             *            an attempt is made to register an instance which is already
37:             *            registered with this instance, no operation is performed.
38:             */
39:            void addHandlerListener(IHandlerListener handlerListener);
40:
41:            /**
42:             * Disposes of this handler. This method is run once when the object is no
43:             * longer referenced. This can be used as an opportunity to unhook listeners
44:             * from other objects.
45:             */
46:            public void dispose();
47:
48:            /**
49:             * Executes with the map of parameter values by name.
50:             * 
51:             * @param parameterValuesByName
52:             *            the map of parameter values by name. Reserved for future use,
53:             *            must be <code>null</code>.
54:             * @return the result of the execution. Reserved for future use, must be
55:             *         <code>null</code>.
56:             * @throws ExecutionException
57:             *             if an exception occurred during execution.
58:             */
59:            Object execute(Map parameterValuesByName) throws ExecutionException;
60:
61:            /**
62:             * Returns the map of attribute values by name.
63:             * <p>
64:             * Notification is sent to all registered listeners if this property
65:             * changes.
66:             * </p>
67:             * 
68:             * @return the map of attribute values by name. This map may be empty, but
69:             *         is guaranteed not to be <code>null</code>. If this map is not
70:             *         empty, its collection of keys is guaranteed to only contain
71:             *         instances of <code>String</code>.
72:             */
73:            Map getAttributeValuesByName();
74:
75:            /**
76:             * Unregisters an instance of <code>IPropertyListener</code> listening for
77:             * changes to properties of this instance.
78:             * 
79:             * @param handlerListener
80:             *            the instance to unregister. Must not be <code>null</code>.
81:             *            If an attempt is made to unregister an instance which is not
82:             *            already registered with this instance, no operation is
83:             *            performed.
84:             */
85:            void removeHandlerListener(IHandlerListener handlerListener);
86:        }
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