| /* |
| * 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.twill.filesystem; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.base.Throwables; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileContext; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.UnsupportedFileSystemException; |
| |
| import java.net.URI; |
| import java.util.Objects; |
| |
| /** |
| * A {@link LocationFactory} implementation that uses {@link FileContext} to create {@link Location}. |
| */ |
| public class FileContextLocationFactory implements LocationFactory { |
| |
| private final Configuration configuration; |
| private final FileContext fc; |
| private final Path pathBase; |
| |
| /** |
| * Same as {@link #FileContextLocationFactory(Configuration, String) FileContextLocationFactory(configuration, "/")}. |
| */ |
| public FileContextLocationFactory(Configuration configuration) { |
| this(configuration, "/"); |
| } |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param configuration the hadoop configuration |
| * @param pathBase base path for all non-absolute location created through this {@link LocationFactory}. |
| */ |
| public FileContextLocationFactory(Configuration configuration, String pathBase) { |
| this(configuration, createFileContext(configuration), pathBase); |
| } |
| |
| /** |
| * Creates a new instance with the given {@link FileContext} created from the given {@link Configuration}. |
| * |
| * @param configuration the hadoop configuration |
| * @param fc {@link FileContext} instance created from the given configuration |
| * @param pathBase base path for all non-absolute location created through this (@link LocationFactory}. |
| */ |
| public FileContextLocationFactory(Configuration configuration, FileContext fc, String pathBase) { |
| this.configuration = configuration; |
| this.fc = fc; |
| this.pathBase = new Path(pathBase.startsWith("/") ? pathBase : "/" + pathBase); |
| } |
| |
| @Override |
| public Location create(String path) { |
| if (path.startsWith("/")) { |
| path = path.substring(1); |
| } |
| Path locationPath; |
| if (path.isEmpty()) { |
| locationPath = pathBase; |
| } else { |
| locationPath = new Path(path); |
| } |
| locationPath = locationPath.makeQualified(fc.getDefaultFileSystem().getUri(), pathBase); |
| return new FileContextLocation(this, fc, locationPath); |
| } |
| |
| @Override |
| public Location create(URI uri) { |
| URI contextURI = fc.getWorkingDirectory().toUri(); |
| if (Objects.equals(contextURI.getScheme(), uri.getScheme()) |
| && Objects.equals(contextURI.getAuthority(), uri.getAuthority())) { |
| // A full URI |
| return new FileContextLocation(this, fc, new Path(uri)); |
| } |
| |
| if (uri.isAbsolute()) { |
| // Needs to be of the same scheme |
| Preconditions.checkArgument(Objects.equals(contextURI.getScheme(), uri.getScheme()), |
| "Only URI with '%s' scheme is supported", contextURI.getScheme()); |
| Path locationPath = new Path(uri).makeQualified(fc.getDefaultFileSystem().getUri(), pathBase); |
| return new FileContextLocation(this, fc, locationPath); |
| } |
| |
| return create(uri.getPath()); |
| } |
| |
| @Override |
| public Location getHomeLocation() { |
| // Fix for TWILL-163. FileContext.getHomeDirectory() uses System.getProperty("user.name") instead of UGI |
| return new FileContextLocation(this, fc, |
| new Path(fc.getHomeDirectory().getParent(), fc.getUgi().getShortUserName())); |
| } |
| |
| /** |
| * Returns the {@link FileContext} used by this {@link LocationFactory}. |
| */ |
| public FileContext getFileContext() { |
| return fc; |
| } |
| |
| /** |
| * Returns the {@link Configuration} used by this {@link LocationFactory}. |
| */ |
| public Configuration getConfiguration() { |
| return configuration; |
| } |
| |
| private static FileContext createFileContext(Configuration configuration) { |
| try { |
| return FileContext.getFileContext(configuration); |
| } catch (UnsupportedFileSystemException e) { |
| throw Throwables.propagate(e); |
| } |
| } |
| } |