| /** |
| * 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; |
| |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.EnumSet; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.permission.FsPermission; |
| import org.apache.hadoop.util.Progressable; |
| |
| /** |
| * Implementation of AbstractFileSystem based on the existing implementation of |
| * {@link FileSystem}. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public abstract class DelegateToFileSystem extends AbstractFileSystem { |
| protected final FileSystem fsImpl; |
| |
| protected DelegateToFileSystem(URI theUri, FileSystem theFsImpl, |
| Configuration conf, String supportedScheme, boolean authorityRequired) |
| throws IOException, URISyntaxException { |
| super(theUri, supportedScheme, authorityRequired, |
| FileSystem.getDefaultUri(conf).getPort()); |
| fsImpl = theFsImpl; |
| fsImpl.initialize(theUri, conf); |
| fsImpl.statistics = getStatistics(); |
| } |
| |
| @Override |
| protected Path getInitialWorkingDirectory() { |
| return fsImpl.getInitialWorkingDirectory(); |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") // call to primitiveCreate |
| protected FSDataOutputStream createInternal (Path f, |
| EnumSet<CreateFlag> flag, FsPermission absolutePermission, int bufferSize, |
| short replication, long blockSize, Progressable progress, |
| int bytesPerChecksum, boolean createParent) throws IOException { |
| checkPath(f); |
| |
| // Default impl assumes that permissions do not matter |
| // calling the regular create is good enough. |
| // FSs that implement permissions should override this. |
| |
| if (!createParent) { // parent must exist. |
| // since this.create makes parent dirs automatically |
| // we must throw exception if parent does not exist. |
| final FileStatus stat = getFileStatus(f.getParent()); |
| if (stat == null) { |
| throw new FileNotFoundException("Missing parent:" + f); |
| } |
| if (!stat.isDirectory()) { |
| throw new ParentNotDirectoryException("parent is not a dir:" + f); |
| } |
| // parent does exist - go ahead with create of file. |
| } |
| return fsImpl.primitiveCreate(f, absolutePermission, flag, |
| bufferSize, replication, blockSize, progress, bytesPerChecksum); |
| } |
| |
| @Override |
| protected boolean delete(Path f, boolean recursive) throws IOException { |
| checkPath(f); |
| return fsImpl.delete(f, recursive); |
| } |
| |
| @Override |
| protected BlockLocation[] getFileBlockLocations(Path f, long start, long len) |
| throws IOException { |
| checkPath(f); |
| return fsImpl.getFileBlockLocations(f, start, len); |
| } |
| |
| @Override |
| protected FileChecksum getFileChecksum(Path f) throws IOException { |
| checkPath(f); |
| return fsImpl.getFileChecksum(f); |
| } |
| |
| @Override |
| protected FileStatus getFileStatus(Path f) throws IOException { |
| checkPath(f); |
| return fsImpl.getFileStatus(f); |
| } |
| |
| @Override |
| protected FileStatus getFileLinkStatus(final Path f) throws IOException { |
| return getFileStatus(f); |
| } |
| |
| @Override |
| protected FsStatus getFsStatus() throws IOException { |
| return fsImpl.getStatus(); |
| } |
| |
| @Override |
| protected FsServerDefaults getServerDefaults() throws IOException { |
| return fsImpl.getServerDefaults(); |
| } |
| |
| @Override |
| protected int getUriDefaultPort() { |
| return 0; |
| } |
| |
| @Override |
| protected FileStatus[] listStatus(Path f) throws IOException { |
| checkPath(f); |
| return fsImpl.listStatus(f); |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") // call to primitiveMkdir |
| protected void mkdir(Path dir, FsPermission permission, boolean createParent) |
| throws IOException { |
| checkPath(dir); |
| fsImpl.primitiveMkdir(dir, permission, createParent); |
| |
| } |
| |
| @Override |
| protected FSDataInputStream open(Path f, int bufferSize) throws IOException { |
| checkPath(f); |
| return fsImpl.open(f, bufferSize); |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") // call to rename |
| protected void renameInternal(Path src, Path dst) throws IOException { |
| checkPath(src); |
| checkPath(dst); |
| fsImpl.rename(src, dst, Options.Rename.NONE); |
| } |
| |
| @Override |
| protected void setOwner(Path f, String username, String groupname) |
| throws IOException { |
| checkPath(f); |
| fsImpl.setOwner(f, username, groupname); |
| } |
| |
| @Override |
| protected void setPermission(Path f, FsPermission permission) |
| throws IOException { |
| checkPath(f); |
| fsImpl.setPermission(f, permission); |
| } |
| |
| @Override |
| protected boolean setReplication(Path f, short replication) |
| throws IOException { |
| checkPath(f); |
| return fsImpl.setReplication(f, replication); |
| } |
| |
| @Override |
| protected void setTimes(Path f, long mtime, long atime) throws IOException { |
| checkPath(f); |
| fsImpl.setTimes(f, mtime, atime); |
| } |
| |
| @Override |
| protected void setVerifyChecksum(boolean verifyChecksum) throws IOException { |
| fsImpl.setVerifyChecksum(verifyChecksum); |
| } |
| |
| @Override |
| protected boolean supportsSymlinks() { |
| return false; |
| } |
| |
| @Override |
| protected void createSymlink(Path target, Path link, boolean createParent) |
| throws IOException { |
| throw new IOException("File system does not support symlinks"); |
| } |
| |
| @Override |
| protected Path getLinkTarget(final Path f) throws IOException { |
| /* We should never get here. Any file system that threw an |
| * UnresolvedLinkException, causing this function to be called, |
| * should override getLinkTarget. |
| */ |
| throw new AssertionError(); |
| } |
| } |