| /* |
| * 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.spi.commit; |
| |
| import org.apache.jackrabbit.oak.spi.state.NodeState; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * Basic content change observer that doesn't do anything. Useful as a |
| * "null object" for cases where another observer has not been configured, |
| * thus avoiding an extra {@code null} check when invoking the observer. |
| */ |
| public class EmptyObserver implements Observer { |
| |
| /** |
| * Static instance of this class, useful as a "null object". |
| */ |
| public static final EmptyObserver INSTANCE = new EmptyObserver(); |
| |
| @Override |
| public void contentChanged( |
| @NotNull NodeState root, @NotNull CommitInfo info) { |
| // do nothing |
| } |
| |
| } |