| /** |
| * 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.crunch; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| |
| /** |
| * An interface for classes that implement both the {@code Source} and the |
| * {@code Target} interfaces. |
| * |
| */ |
| public interface SourceTarget<T> extends Source<T>, Target { |
| /** |
| * Adds the given key-value pair to the {@code Configuration} instance(s) that are used to |
| * read and write this {@code SourceTarget<T>}. Allows for multiple inputs and outputs to |
| * re-use the same config keys with different values when necessary. |
| */ |
| SourceTarget<T> conf(String key, String value); |
| |
| /** |
| * Adds the {@code Configuration} of the given filesystem such that the source-target can read/write from/to it when |
| * the {@code Pipeline} itself does not have that configuration. |
| * </p> |
| * Changing the filesystem after it is set is not supported and will result in {@link |
| * IllegalStateException} |
| * |
| * @param fileSystem the filesystem |
| * @return this SourceTarget |
| * @throws IllegalStateException if the filesystem has already been set |
| * @throws IllegalArgumentException if the source/target is pointing to a fully qualified Path in a different |
| * FileSystem |
| */ |
| SourceTarget<T> fileSystem(FileSystem fileSystem); |
| } |