/*
 * File   : $Source: /usr/local/cvs/opencms/src/org/opencms/workplace/explorer/menu/I_CmsMenuItemRule.java,v $
 * Date   : $Date: 2008-02-27 12:05:22 $
 * Version: $Revision: 1.4 $
 *
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) 2002 - 2008 Alkacon Software GmbH (http://www.alkacon.com)
 *
 * 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.
 *
 * For further information about Alkacon Software GmbH, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 * 
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.workplace.explorer.menu;

import org.opencms.file.CmsObject;
import org.opencms.workplace.explorer.CmsResourceUtil;

/**
 * Defines a menu item rule to check the visibility of a context menu item in the explorer view.<p>
 * 
 * @author Andreas Zahner  
 * 
 * @version $Revision: 1.4 $ 
 * 
 * @since 6.5.6 
 */
public interface I_CmsMenuItemRule {

    /**
     * Returns the visibility for the menu item.<p>
     * 
     * The possible visibilities are:
     * <ul>
     * <li>{@link CmsMenuItemVisibilityMode#VISIBILITY_ACTIVE} menu item is active</li>
     * <li>{@link CmsMenuItemVisibilityMode#VISIBILITY_INACTIVE} menu item is inactive (greyed out)</li>
     * <li>{@link CmsMenuItemVisibilityMode#VISIBILITY_INVISIBLE} menu item is invisible</li>
     * </ul>
     * 
     * @param cms the current OpenCms user context
     * @param resourceUtil the initialized resource utilities for which the menu item visibility is checked
     * @return the visibility of the menu item
     */
    CmsMenuItemVisibilityMode getVisibility(CmsObject cms, CmsResourceUtil[] resourceUtil);

    /**
     * Returns the visibility for the menu item, depending on the resource utilities and menu item rules.<p>
     * 
     * @param cms the current OpenCms user context
     * @param resourceUtil the initialized resource utilities for which the menu item visibility is checked
     * @param rule the rules which are checked for visibility
     * @return the visibility for the menu item
     */
    CmsMenuItemVisibilityMode getVisibility(CmsObject cms, CmsResourceUtil[] resourceUtil, I_CmsMenuItemRule[] rule);

    /**
     * Returns if the rule for the menu item should be applied or not.<p>
     * 
     * @param cms the current OpenCms user context
     * @param resourceUtil the initialized resource utilities for which the menu item rule is checked
     * @return true if the rule for the menu item should be applied, otherwise false
     */
    boolean matches(CmsObject cms, CmsResourceUtil[] resourceUtil);

}
