001    /*
002     * Copyright 2002-2004 the original author or authors.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     * 
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.springframework.richclient.command;
017    
018    import java.beans.PropertyChangeListener;
019    
020    import org.springframework.richclient.core.Guarded;
021    
022    /**
023     * An {@link ActionCommandExecutor} that can be enabled or disabled, with optional listeners
024     * for these state changes.
025     *  
026     * @author Keith Donald
027     */
028    public interface GuardedActionCommandExecutor extends Guarded, ActionCommandExecutor {
029            
030            /**
031             * Adds the given listener to the collection of listeners that will be notified 
032             * when the command executor's enabled state changes.
033             *
034             * @param listener The listener to be added.
035             */
036        public void addEnabledListener(PropertyChangeListener listener);
037    
038        /**
039         * Removes the given listener from the collection of listeners that will be 
040         * notified when the command executor's enabled state changes.
041         *
042         * @param listener The listener to be removed.
043         */
044        public void removeEnabledListener(PropertyChangeListener listener);
045        
046    }