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.gwt.client;
029
030import org.opencms.gwt.client.util.CmsJSONMap;
031
032import com.google.gwt.core.client.JavaScriptObject;
033
034/**
035 * Accessor for a global singleton JSON object used to pass additional context information to RPC calls.
036 */
037public class CmsRpcContext {
038
039    /** The JSON map. */
040    private static CmsJSONMap m_map;
041
042    /**
043     * Gets the JSON map.
044     *
045     * @return the JSON map
046     */
047    public static CmsJSONMap get() {
048
049        if (m_map == null) {
050            m_map = CmsJSONMap.createJSONMap();
051            installContext(m_map);
052        }
053        return m_map;
054
055    }
056
057    /**
058     * Installs the JSON object as a variable in the main window.
059     *
060     * @param context the context to set
061     */
062    private static native void installContext(JavaScriptObject context) /*-{
063                $wnd.ocmsRpcContext = context;
064    }-*/;
065
066}