SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package javax.microedition.lcdui;

/**
 * This represents the base for an action which may be given a label, an
 * image, and could be enabled or disabled.
 *
 * @since 2018/03/31
 */
abstract class __Action__
{
    /** The priority to use for menu items. */
    static final int _MENU_PRIORITY =
        Integer.MIN_VALUE;
    
    /** The image used. */
    volatile Image _image;
    
    /** The short label. */
    volatile String _shortLabel;
    
    /** The long label. */
    volatile String _longLabel;
    
    /**
     * This is called when the enabled state of the parent has changed.
     *
     * @param __e If the parent is enabled or disabled.
     * @since 2018/04/01
     */
    abstract void onParentEnabled(boolean __e);
    
    /**
     * Returns the label of this item.
     * 
     * @return The label for this item.
     * @since 2020/09/27
     */
    final String __getLabel()
    {
        String label = this._longLabel;
        return (label != null ? label : this._shortLabel);
    }
    
    /**
     * Gets the priority of the given action.
     * 
     * @param __action The action to get the priority of.
     * @return The priority of the given action.
     * @throws NullPointerException On null arguments.
     * @since 2020/09/27
     */
    static int __getPriority(__Action__ __action)
        throws NullPointerException
    {
        if (__action == null)
            throw new NullPointerException("NARG");
        
        // Commands use the given priorities set by the programmer but menus
        // have none
        if (__action instanceof Command)
            return ((Command)__action).getPriority();
        return __Action__._MENU_PRIORITY;
    }
}