targetable.java

来自「java实现浏览器等本地桌面的功能」· Java 代码 · 共 65 行

/*
 * $Id: Targetable.java,v 1.2 2005/10/10 18:02:41 rbair Exp $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

package org.jdesktop.swingx.action;


/**
 * An interface which exposes the allowable actions to a TargetManager. 
 * The getCommands method will expose the allowable actions to another class
 * and the doCommand method is called to invoke an action on the class.
 * <p>
 * Usually, the command key will be the key value of the Action. For components
 * This could be the ActionMap keys. For actions managed with the ActionManager,
 * this will be the value of an actions Action.ACTION_COMMAND_KEY
 * 
 * @see TargetManager
 * @author Mark Davidson
 */
public interface Targetable {

    /**
     * Perform the command using the object value.
     *
     * @param command is a Action.ACTION_COMMAND_KEY
     * @param value an arbitrary value. Usually this will be
     *              EventObject which trigered the command.
     */
    boolean doCommand(Object command, Object value);

    /**
     * Return a flag that indicates if a command is supported.
     * 
     * @param command is a Action.ACTION_COMMAND_KEY
     * @return true if command is supported; false otherwise
     */
    boolean hasCommand(Object command);

    /**
     * Returns an array of supported commands. If this Targetable 
     * doesn't support any commands (which is unlikely) then an 
     * empty array is returned.
     *
     * @return array of supported commands
     */
    Object[] getCommands();
}