| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.jackrabbit.oak.plugins.commit; |
| |
| import static org.apache.jackrabbit.JcrConstants.JCR_LASTMODIFIED; |
| import static org.apache.jackrabbit.JcrConstants.JCR_CREATED; |
| import static org.apache.jackrabbit.util.ISO8601.parse; |
| |
| import java.util.Calendar; |
| |
| import org.apache.jackrabbit.oak.api.PropertyState; |
| import org.apache.jackrabbit.oak.api.Type; |
| import org.apache.jackrabbit.oak.spi.state.NodeBuilder; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * Conflict Handler that merges concurrent updates to |
| * {@code org.apache.jackrabbit.JcrConstants.JCR_LASTMODIFIED} by picking the |
| * older of the 2 conflicting dates and |
| * {@code org.apache.jackrabbit.JcrConstants.JCR_CREATED} by picking the newer |
| * of the 2 conflicting dates. |
| */ |
| public class JcrLastModifiedConflictHandler extends DefaultThreeWayConflictHandler { |
| |
| public JcrLastModifiedConflictHandler() { |
| super(Resolution.IGNORED); |
| } |
| |
| @NotNull |
| @Override |
| public Resolution addExistingProperty(NodeBuilder parent, PropertyState ours, PropertyState theirs) { |
| if (isModifiedOrCreated(ours.getName())) { |
| merge(parent, ours, theirs); |
| return Resolution.MERGED; |
| } |
| return Resolution.IGNORED; |
| } |
| |
| @NotNull |
| @Override |
| public Resolution changeChangedProperty(NodeBuilder parent, PropertyState ours, PropertyState theirs, |
| PropertyState base) { |
| if (isModifiedOrCreated(ours.getName())) { |
| merge(parent, ours, theirs); |
| return Resolution.MERGED; |
| } |
| return Resolution.IGNORED; |
| } |
| |
| private static void merge(NodeBuilder parent, PropertyState ours, PropertyState theirs) { |
| Calendar o = parse(ours.getValue(Type.DATE)); |
| Calendar t = parse(theirs.getValue(Type.DATE)); |
| if (JCR_CREATED.equals(ours.getName())) { |
| parent.setProperty(ours.getName(), pick(o, t, true)); |
| } else { |
| parent.setProperty(ours.getName(), pick(o, t, false)); |
| } |
| } |
| |
| private static Calendar pick(Calendar a, Calendar b, boolean jcrCreated) { |
| if (a.before(b)) { |
| return jcrCreated ? a : b; |
| } else { |
| return jcrCreated ? b : a; |
| } |
| } |
| |
| private static boolean isModifiedOrCreated(String name) { |
| return JCR_LASTMODIFIED.equals(name) || JCR_CREATED.equals(name); |
| } |
| } |