| /* |
| * 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.document.util; |
| |
| import org.apache.jackrabbit.oak.api.PropertyState; |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| import org.apache.jackrabbit.oak.spi.state.NodeStateDiff; |
| |
| import static org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.EMPTY_NODE; |
| import static org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.MISSING_NODE; |
| |
| /** |
| * A {@link NodeStateDiff} implementation that counts the differences between |
| * two node states, including their sub tree. |
| */ |
| public class CountingDiff implements NodeStateDiff { |
| |
| private int changes = 0; |
| |
| public static int countChanges(NodeState before, NodeState after) { |
| CountingDiff counter = new CountingDiff(); |
| after.compareAgainstBaseState(before, counter); |
| return counter.getNumChanges(); |
| } |
| |
| @Override |
| public boolean propertyAdded(PropertyState after) { |
| inc(); |
| return true; |
| } |
| |
| @Override |
| public boolean propertyChanged(PropertyState before, PropertyState after) { |
| inc(); |
| return true; |
| } |
| |
| @Override |
| public boolean propertyDeleted(PropertyState before) { |
| inc(); |
| return true; |
| } |
| |
| @Override |
| public boolean childNodeAdded(String name, NodeState after) { |
| inc(); |
| return after.compareAgainstBaseState(EMPTY_NODE, this); |
| } |
| |
| @Override |
| public boolean childNodeChanged(String name, |
| NodeState before, |
| NodeState after) { |
| return after.compareAgainstBaseState(before, this); |
| } |
| |
| @Override |
| public boolean childNodeDeleted(String name, NodeState before) { |
| inc(); |
| return MISSING_NODE.compareAgainstBaseState(before, this); |
| } |
| |
| public int getNumChanges() { |
| return changes; |
| } |
| |
| private void inc() { |
| changes++; |
| } |
| } |