content: /*
   * 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.beam.sdk.values;
  
  import static org.apache.beam.sdk.TestUtils.LINES;
  
  import java.io.File;
  import org.apache.beam.sdk.io.TextIO;
  import org.apache.beam.sdk.testing.NeedsRunner;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.testing.ValidatesRunner;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.junit.Ignore;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.rules.TemporaryFolder;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for PDone. */
  @RunWith(JUnit4.class)
  public class PDoneTest {
  
    @Rule public final TestPipeline p = TestPipeline.create();
  
    @Rule public TemporaryFolder tmpFolder = new TemporaryFolder();
  
    /** A PTransform that just returns a fresh PDone. */
    static class EmptyTransform extends PTransform<PBegin, PDone> {
      @Override
      public PDone expand(PBegin begin) {
        return PDone.in(begin.getPipeline());
      }
    }
  
    /** A PTransform that's composed of something that returns a PDone. */
    static class SimpleTransform extends PTransform<PBegin, PDone> {
      private final String filename;
  
      public SimpleTransform(String filename) {
        this.filename = filename;
      }
  
      @Override
      public PDone expand(PBegin begin) {
        return begin.apply(Create.of(LINES)).apply(TextIO.write().to(filename));
      }
    }
  
    // TODO: This test doesn't work, because we can't handle composite
    // transforms that contain no nested transforms.
    @Ignore
    @Test
    @Category(ValidatesRunner.class)
    public void testEmptyTransform() {
      p.begin().apply(new EmptyTransform());
  
      p.run();
    }
  
    // Cannot run on the service, unless we allocate a GCS temp file
    // instead of a local temp file.  Or switch to applying a different
    // transform that returns PDone.
    @Test
    @Category(NeedsRunner.class)
    public void testSimpleTransform() throws Exception {
      File tmpFile = tmpFolder.newFile("file.txt");
      String filename = tmpFile.getPath();
  
      p.begin().apply(new SimpleTransform(filename));
  
      p.run();
    }
  }
  