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;
029
030import java.util.Set;
031
032import com.google.gwt.user.server.rpc.SerializationPolicy;
033import com.google.gwt.user.server.rpc.impl.LegacySerializationPolicy;
034
035/**
036 * A GWT serialization policy for pre-fetching.<p>
037 *
038 * @since 8.0.0
039 */
040public final class CmsPrefetchSerializationPolicy extends SerializationPolicy {
041
042    /** The singleton instance of this serialization policy. */
043    private static CmsPrefetchSerializationPolicy m_instance;
044
045    /** An instance of the legacy serialization policy. */
046    private LegacySerializationPolicy m_legacyPolicy = LegacySerializationPolicy.getInstance();
047
048    /**
049     * Hidden default constructor.<p>
050     */
051    private CmsPrefetchSerializationPolicy() {
052
053        // do nothing
054    }
055
056    /**
057     * Returns the singleton instance of this class.<p>
058     *
059     * @return the singleton instance of this class
060     */
061    public static CmsPrefetchSerializationPolicy instance() {
062
063        if (m_instance == null) {
064            m_instance = new CmsPrefetchSerializationPolicy();
065        }
066        return m_instance;
067    }
068
069    /**
070     * @see com.google.gwt.user.server.rpc.SerializationPolicy#getClientFieldNamesForEnhancedClass(java.lang.Class)
071     */
072    @Override
073    public Set<String> getClientFieldNamesForEnhancedClass(Class<?> clazz) {
074
075        return null;
076    }
077
078    /**
079     * @see com.google.gwt.user.server.rpc.SerializationPolicy#shouldDeserializeFields(java.lang.Class)
080     */
081    @Override
082    public boolean shouldDeserializeFields(Class<?> clazz) {
083
084        return m_legacyPolicy.shouldDeserializeFields(clazz);
085    }
086
087    /**
088     * @see com.google.gwt.user.server.rpc.SerializationPolicy#shouldSerializeFields(java.lang.Class)
089     */
090    @Override
091    public boolean shouldSerializeFields(Class<?> clazz) {
092
093        return m_legacyPolicy.shouldDeserializeFields(clazz);
094    }
095
096    /**
097     * @see com.google.gwt.user.server.rpc.SerializationPolicy#validateDeserialize(java.lang.Class)
098     */
099    @Override
100    public void validateDeserialize(Class<?> clazz) {
101
102        // all are valid
103    }
104
105    /**
106     * @see com.google.gwt.user.server.rpc.SerializationPolicy#validateSerialize(java.lang.Class)
107     */
108    @Override
109    public void validateSerialize(Class<?> clazz) {
110
111        // all are valid
112    }
113}