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OpenCms is an enterprise-ready, easy to use website content management system based on Java and XML technology. Offering a complete set of features, OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently.

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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) 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, 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.gwt.client.rpc;

import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.client.rpc.SerializationStreamFactory;

/**
 * Utility class for deserializing prefetched RPC data.
 * 
 * @since 8.0
 */
public final class CmsRpcPrefetcher {

    /**
     * Hidden constructor.

     */
    private CmsRpcPrefetcher() {

        // empty
    }

    /**
     * Deserializes the prefetched RPC data with the given dictionary name.

     * 
     * @param asyncService the RPC service instance
     * @param dictionaryName the global variable name
     * 
     * @return the prefetched RPC data
     * 
     * @throws SerializationException if the deserialization fails 
     */
    public static Object getSerializedObjectFromDictionary(Object asyncService, String dictionaryName)
    throws SerializationException {

        return getSerializedObjectFromString(asyncService, getString(dictionaryName));
    }

    /**
     * Deserializes the prefetched RPC data.

     * 
     * @param asyncService the RPC service instance
     * @param serializedData the serialized object data
     * 
     * @return the prefetched RPC data
     * 
     * @throws SerializationException if the deserialization fails 
     */
    public static Object getSerializedObjectFromString(Object asyncService, String serializedData)
    throws SerializationException {

        SerializationStreamFactory ssf = (SerializationStreamFactory)asyncService;
        return ssf.createStreamReader(serializedData).readObject();
    }

    /**
     * Retrieves the given global variable as a string.
     * 
     * @param name the name of the variable to retrieve
     * 
     * @return the variable's value
     */
    private static native String getString(String name) /*-{
        var metas = $wnd.document.getElementsByTagName('META');
        var i;
        for (i = 0; i < metas.length; i++) {
            if (metas[i].getAttribute('NAME') == name) {
                break;
            }
        }
        return metas[i].getAttribute("CONTENT");
    }-*/;
}