001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.ui.contextmenu;
029
030import org.opencms.file.CmsObject;
031import org.opencms.file.CmsResource;
032import org.opencms.ui.I_CmsDialogContext;
033
034import java.util.List;
035
036/**
037 * Decorator for menu item visibility classes which always returns INVISIBLE if more than one resource
038 * is passed, but otherwise delegates the decision to its wrapped instance.<p>
039 */
040public class CmsMenuItemVisibilitySingleOnly implements I_CmsHasMenuItemVisibility {
041
042    /** The wrapped instance to delegate to. */
043    private I_CmsHasMenuItemVisibility m_visibility;
044
045    /**
046     * Creates a new instance wrapping the given visibility handler.<p>
047     *
048     * @param visibility the wrapped visibility handler
049     */
050    public CmsMenuItemVisibilitySingleOnly(I_CmsHasMenuItemVisibility visibility) {
051        m_visibility = visibility;
052    }
053
054    /**
055     * @see org.opencms.ui.contextmenu.I_CmsHasMenuItemVisibility#getVisibility(org.opencms.file.CmsObject, java.util.List)
056     */
057    public CmsMenuItemVisibilityMode getVisibility(CmsObject cms, List<CmsResource> resources) {
058
059        if (resources.size() != 1) {
060            return CmsMenuItemVisibilityMode.VISIBILITY_INVISIBLE;
061        }
062        return m_visibility.getVisibility(cms, resources);
063    }
064
065    /**
066     * @see org.opencms.ui.contextmenu.I_CmsHasMenuItemVisibility#getVisibility(org.opencms.ui.I_CmsDialogContext)
067     */
068    public CmsMenuItemVisibilityMode getVisibility(I_CmsDialogContext context) {
069
070        return getVisibility(context.getCms(), context.getResources());
071    }
072}