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.transforms.display;
  
  import static org.apache.beam.sdk.transforms.display.DisplayDataMatchers.hasDisplayItem;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.hasItem;
  import static org.hamcrest.Matchers.not;
  
  import java.io.Serializable;
  import java.util.Set;
  import org.apache.beam.sdk.io.TextIO;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.POutput;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link DisplayDataEvaluator}. */
  @RunWith(JUnit4.class)
  public class DisplayDataEvaluatorTest implements Serializable {
  
    @Test
    public void testCompositeTransform() {
      PTransform<? super PCollection<String>, ? super POutput> myTransform =
          new PTransform<PCollection<String>, POutput>() {
            @Override
            public PCollection<String> expand(PCollection<String> input) {
              return input.apply(
                  ParDo.of(
                      new DoFn<String, String>() {
                        @ProcessElement
                        public void processElement(ProcessContext c) throws Exception {
                          c.output(c.element());
                        }
  
                        @Override
                        public void populateDisplayData(DisplayData.Builder builder) {
                          builder.add(DisplayData.item("primitiveKey", "primitiveValue"));
                        }
                      }));
            }
  
            @Override
            public void populateDisplayData(DisplayData.Builder builder) {
              builder.add(DisplayData.item("compositeKey", "compositeValue"));
            }
          };
  
      DisplayDataEvaluator evaluator = DisplayDataEvaluator.create();
      Set<DisplayData> displayData = evaluator.displayDataForPrimitiveTransforms(myTransform);
  
      assertThat(displayData, not(hasItem(hasDisplayItem("compositeKey", "compositeValue"))));
      assertThat(displayData, hasItem(hasDisplayItem("primitiveKey", "primitiveValue")));
    }
  
    @Test
    public void testPrimitiveTransform() {
      PTransform<? super PCollection<Integer>, ? super PCollection<Integer>> myTransform =
          ParDo.of(
              new DoFn<Integer, Integer>() {
                @ProcessElement
                public void processElement(ProcessContext c) throws Exception {}
  
                @Override
                public void populateDisplayData(DisplayData.Builder builder) {
                  builder.add(DisplayData.item("foo", "bar"));
                }
              });
  
      DisplayDataEvaluator evaluator = DisplayDataEvaluator.create();
      Set<DisplayData> displayData = evaluator.displayDataForPrimitiveTransforms(myTransform);
  
      assertThat(displayData, hasItem(hasDisplayItem("foo")));
    }
  
    @Test
    public void testSourceTransform() {
      PTransform<? super PBegin, ? extends POutput> myTransform = TextIO.read().from("foo.*");
  
      DisplayDataEvaluator evaluator = DisplayDataEvaluator.create();
      Set<DisplayData> displayData = evaluator.displayDataForPrimitiveSourceTransforms(myTransform);
  
      assertThat(displayData, hasItem(hasDisplayItem("filePattern", "foo.*")));
    }
  }
  