001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *                               ***
008 *
009 *   Community License: GPL 3.0
010 *
011 *   This file is free software: you can redistribute it and/or modify
012 *   it under the terms of the GNU General Public License as published
013 *   by the Free Software Foundation, either version 3 of the License,
014 *   or (at your option) any later version.
015 *
016 *   This file is distributed in the hope that it will be useful, but
017 *   WITHOUT ANY WARRANTY; without even the implied warranty of
018 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
019 *   GNU General Public License for more details.
020 *
021 *   You should have received a copy of the GNU General Public License
022 *   along with this program. If not, see <http://www.gnu.org/licenses/>.
023 *
024 *                               ***
025 *
026 *   Available Commercial License: GraniteDS SLA 1.0
027 *
028 *   This is the appropriate option if you are creating proprietary
029 *   applications and you are not prepared to distribute and share the
030 *   source code of your application under the GPL v3 license.
031 *
032 *   Please visit http://www.granitedataservices.com/license for more
033 *   details.
034 */
035package org.granite.client.tide.server;
036
037/**
038 * Convenience classes to build Tide responders
039 *
040 * @author William DRAI
041 */
042public class TideResponders {
043        
044        private static class EmptyTideResponder<T> implements TideMergeResponder<T> {
045                
046                private final T mergeWith;
047                
048                public EmptyTideResponder(T mergeWith) {
049                        this.mergeWith = mergeWith;
050                }
051        
052                @Override
053                public final void result(TideResultEvent<T> event) {
054                        // Do nothing
055                }
056                
057                @Override
058                public final void fault(TideFaultEvent event) {
059                        // Do nothing
060                }
061                
062                @Override
063                public T getMergeResultWith() {
064                        return mergeWith;
065                }
066        }
067
068    /**
069     * Create an empty responder which does not implement any operation
070     * @param <T> expected result type
071     * @return a new responder
072     */
073        public static <T> TideResponder<T> noop() {
074                return new EmptyTideResponder<T>(null);
075        }
076
077    /**
078     * Create an empty responder which forces the merge of the result with an existing object
079     * @param mergeWith object to merge the result with
080     * @param <T> expected result type
081     * @return a new responder
082     */
083        public static <T> TideMergeResponder<T> mergeWith(T mergeWith) {
084                return new EmptyTideResponder<T>(mergeWith);
085        }
086
087}