| /* |
| * 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.hadoop.fs.s3a.s3guard; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * A no-op implementation of MetadataStore. Clients that use this |
| * implementation should behave the same as they would without any |
| * MetadataStore. |
| */ |
| public class NullMetadataStore implements MetadataStore { |
| |
| @Override |
| public void initialize(FileSystem fs) throws IOException { |
| } |
| |
| @Override |
| public void initialize(Configuration conf) throws IOException { |
| } |
| |
| @Override |
| public void close() throws IOException { |
| } |
| |
| @Override |
| public void delete(Path path) throws IOException { |
| } |
| |
| @Override |
| public void forgetMetadata(Path path) throws IOException { |
| } |
| |
| @Override |
| public void deleteSubtree(Path path) throws IOException { |
| } |
| |
| @Override |
| public PathMetadata get(Path path) throws IOException { |
| return null; |
| } |
| |
| @Override |
| public PathMetadata get(Path path, boolean wantEmptyDirectoryFlag) |
| throws IOException { |
| return null; |
| } |
| |
| @Override |
| public DirListingMetadata listChildren(Path path) throws IOException { |
| return null; |
| } |
| |
| @Override |
| public void move(Collection<Path> pathsToDelete, |
| Collection<PathMetadata> pathsToCreate) throws IOException { |
| } |
| |
| @Override |
| public void put(PathMetadata meta) throws IOException { |
| } |
| |
| @Override |
| public void put(Collection<PathMetadata> meta) throws IOException { |
| } |
| |
| @Override |
| public void put(DirListingMetadata meta) throws IOException { |
| } |
| |
| @Override |
| public void destroy() throws IOException { |
| } |
| |
| @Override |
| public void prune(long modTime) { |
| } |
| |
| @Override |
| public String toString() { |
| return "NullMetadataStore"; |
| } |
| |
| @Override |
| public Map<String, String> getDiagnostics() throws IOException { |
| Map<String, String> map = new HashMap<>(); |
| map.put("name", "Null Metadata Store"); |
| map.put("description", "This is not a real metadata store"); |
| return map; |
| } |
| |
| @Override |
| public void updateParameters(Map<String, String> parameters) |
| throws IOException { |
| } |
| } |