| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.ozone.om.request.file; |
| |
| import java.io.IOException; |
| import java.nio.file.Path; |
| |
| import org.apache.hadoop.ozone.om.OMMetadataManager; |
| |
| import javax.annotation.Nonnull; |
| |
| /** |
| * Base class for file requests. |
| */ |
| public final class OMFileRequest { |
| |
| private OMFileRequest() { |
| } |
| /** |
| * Verify any files exist in the given path in the specified volume/bucket. |
| * @param omMetadataManager |
| * @param volumeName |
| * @param bucketName |
| * @param keyPath |
| * @return true - if file exist in the given path, else false. |
| * @throws IOException |
| */ |
| public static OMDirectoryResult verifyFilesInPath( |
| @Nonnull OMMetadataManager omMetadataManager, |
| @Nonnull String volumeName, |
| @Nonnull String bucketName, @Nonnull String keyName, |
| @Nonnull Path keyPath) throws IOException { |
| |
| String fileNameFromDetails = omMetadataManager.getOzoneKey(volumeName, |
| bucketName, keyName); |
| String dirNameFromDetails = omMetadataManager.getOzoneDirKey(volumeName, |
| bucketName, keyName); |
| |
| while (keyPath != null) { |
| String pathName = keyPath.toString(); |
| |
| String dbKeyName = omMetadataManager.getOzoneKey(volumeName, |
| bucketName, pathName); |
| String dbDirKeyName = omMetadataManager.getOzoneDirKey(volumeName, |
| bucketName, pathName); |
| |
| if (omMetadataManager.getKeyTable().get(dbKeyName) != null) { |
| // Found a file in the given path. |
| // Check if this is actual file or a file in the given path |
| if (dbKeyName.equals(fileNameFromDetails)) { |
| return OMDirectoryResult.FILE_EXISTS; |
| } else { |
| return OMDirectoryResult.FILE_EXISTS_IN_GIVENPATH; |
| } |
| } else if (omMetadataManager.getKeyTable().get(dbDirKeyName) != null) { |
| // Found a directory in the given path. |
| // Check if this is actual directory or a directory in the given path |
| if (dbDirKeyName.equals(dirNameFromDetails)) { |
| return OMDirectoryResult.DIRECTORY_EXISTS; |
| } else { |
| return OMDirectoryResult.DIRECTORY_EXISTS_IN_GIVENPATH; |
| } |
| } |
| keyPath = keyPath.getParent(); |
| } |
| |
| // Found no files/ directories in the given path. |
| return OMDirectoryResult.NONE; |
| } |
| |
| /** |
| * Return codes used by verifyFilesInPath method. |
| */ |
| enum OMDirectoryResult { |
| |
| // In below examples path is assumed as "a/b/c" in volume volume1 and |
| // bucket b1. |
| |
| // When a directory exists in given path. |
| // If we have a directory with name "a/b" we return this enum value. |
| DIRECTORY_EXISTS_IN_GIVENPATH, |
| |
| // When a file exists in given path. |
| // If we have a file with name "a/b" we return this enum value. |
| FILE_EXISTS_IN_GIVENPATH, |
| |
| // When file already exists with the given path. |
| // If we have a file with name "a/b/c" we return this enum value. |
| FILE_EXISTS, |
| |
| // When directory exists with the given path. |
| // If we have a file with name "a/b/c" we return this enum value. |
| DIRECTORY_EXISTS, |
| |
| // If no file/directory exists with the given path. |
| // If we don't have any file/directory name with "a/b/c" or any |
| // sub-directory or file name from the given path we return this enum value. |
| NONE |
| } |
| } |