| /* |
| * 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.aliyun.oss; |
| |
| import com.aliyun.oss.model.OSSObjectSummary; |
| import org.apache.hadoop.fs.Path; |
| |
| import static org.apache.hadoop.fs.aliyun.oss.AliyunOSSUtils.objectRepresentsDirectory; |
| |
| /** |
| * Interface to implement by the logic deciding whether to accept a summary |
| * entry or path as a valid file or directory. |
| */ |
| public interface FileStatusAcceptor { |
| |
| /** |
| * Predicate to decide whether or not to accept a summary entry. |
| * @param keyPath qualified path to the entry |
| * @param summary summary entry |
| * @return true if the entry is accepted (i.e. that a status entry |
| * should be generated. |
| */ |
| boolean accept(Path keyPath, OSSObjectSummary summary); |
| |
| /** |
| * Predicate to decide whether or not to accept a prefix. |
| * @param keyPath qualified path to the entry |
| * @param commonPrefix the prefix |
| * @return true if the entry is accepted (i.e. that a status entry |
| * should be generated.) |
| */ |
| boolean accept(Path keyPath, String commonPrefix); |
| |
| /** |
| * Accept all entries except the base path. |
| */ |
| class AcceptFilesOnly implements FileStatusAcceptor { |
| private final Path qualifiedPath; |
| |
| public AcceptFilesOnly(Path qualifiedPath) { |
| this.qualifiedPath = qualifiedPath; |
| } |
| |
| /** |
| * Reject a summary entry if the key path is the qualified Path. |
| * @param keyPath key path of the entry |
| * @param summary summary entry |
| * @return true if the entry is accepted (i.e. that a status entry |
| * should be generated. |
| */ |
| @Override |
| public boolean accept(Path keyPath, OSSObjectSummary summary) { |
| return !keyPath.equals(qualifiedPath) |
| && !objectRepresentsDirectory(summary.getKey(), summary.getSize()); |
| } |
| |
| /** |
| * Accept no directory paths. |
| * @param keyPath qualified path to the entry |
| * @param prefix common prefix in listing. |
| * @return false, always. |
| */ |
| @Override |
| public boolean accept(Path keyPath, String prefix) { |
| return false; |
| } |
| } |
| |
| /** |
| * Accept all entries except the base path. |
| */ |
| class AcceptAllButSelf implements FileStatusAcceptor { |
| |
| /** Base path. */ |
| private final Path qualifiedPath; |
| |
| /** |
| * Constructor. |
| * @param qualifiedPath an already-qualified path. |
| */ |
| public AcceptAllButSelf(Path qualifiedPath) { |
| this.qualifiedPath = qualifiedPath; |
| } |
| |
| /** |
| * Reject a summary entry if the key path is the qualified Path. |
| * @param keyPath key path of the entry |
| * @param summary summary entry |
| * @return true if the entry is accepted (i.e. that a status entry |
| * should be generated.) |
| */ |
| @Override |
| public boolean accept(Path keyPath, OSSObjectSummary summary) { |
| return !keyPath.equals(qualifiedPath); |
| } |
| |
| /** |
| * Accept all prefixes except the one for the base path, "self". |
| * @param keyPath qualified path to the entry |
| * @param prefix common prefix in listing. |
| * @return true if the entry is accepted (i.e. that a status entry |
| * should be generated. |
| */ |
| @Override |
| public boolean accept(Path keyPath, String prefix) { |
| return !keyPath.equals(qualifiedPath); |
| } |
| } |
| } |