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.hamcrest.CoreMatchers.containsString;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.contains;
  import static org.hamcrest.Matchers.containsInAnyOrder;
  import static org.hamcrest.Matchers.equalTo;
  import static org.junit.Assert.fail;
  
  import com.google.common.testing.EqualsTester;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.io.GenerateSequence;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.joda.time.Duration;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for PCollectionLists. */
  @RunWith(JUnit4.class)
  public class PCollectionListTest {
    @Test
    public void testEmptyListFailure() {
      try {
        PCollectionList.of(Collections.<PCollection<String>>emptyList());
        fail("should have failed");
      } catch (IllegalArgumentException exn) {
        assertThat(
            exn.toString(),
            containsString(
                "must either have a non-empty list of PCollections, "
                    + "or must first call empty(Pipeline)"));
      }
    }
  
    @Test
    public void testIterationOrder() {
      Pipeline p = TestPipeline.create();
      PCollection<Long> createOne = p.apply("CreateOne", Create.of(1L, 2L, 3L));
      PCollection<Long> boundedCount = p.apply("CountBounded", GenerateSequence.from(0).to(23));
      PCollection<Long> unboundedCount = p.apply("CountUnbounded", GenerateSequence.from(0));
      PCollection<Long> createTwo = p.apply("CreateTwo", Create.of(-1L, -2L));
      PCollection<Long> maxReadTimeCount =
          p.apply(
              "CountLimited", GenerateSequence.from(0).withMaxReadTime(Duration.standardSeconds(5)));
  
      ImmutableList<PCollection<Long>> counts =
          ImmutableList.of(boundedCount, maxReadTimeCount, unboundedCount);
      // Build a PCollectionList from a list. This should have the same order as the input list.
      PCollectionList<Long> pcList = PCollectionList.of(counts);
      // Contains is the order-dependent matcher
      assertThat(pcList.getAll(), contains(boundedCount, maxReadTimeCount, unboundedCount));
  
      // A list that is expanded with builder methods has the added value at the end
      PCollectionList<Long> withOneCreate = pcList.and(createTwo);
      assertThat(
          withOneCreate.getAll(),
          contains(boundedCount, maxReadTimeCount, unboundedCount, createTwo));
  
      // Lists that are built entirely from the builder return outputs in the order they were added
      PCollectionList<Long> fromEmpty =
          PCollectionList.<Long>empty(p)
              .and(unboundedCount)
              .and(createOne)
              .and(ImmutableList.of(boundedCount, maxReadTimeCount));
      assertThat(
          fromEmpty.getAll(), contains(unboundedCount, createOne, boundedCount, maxReadTimeCount));
  
      Map<TupleTag<?>, PValue> expansion = fromEmpty.expand();
      // Tag->PValue mappings are stable between expansions. They don't need to be stable across
      // different list instances, though
      assertThat(expansion, equalTo(fromEmpty.expand()));
  
      List<PCollection<Long>> expectedList =
          ImmutableList.of(unboundedCount, createOne, boundedCount, maxReadTimeCount);
      assertThat(expansion.values(), containsInAnyOrder(expectedList.toArray()));
    }
  
    @Test
    public void testExpandWithDuplicates() {
      Pipeline p = TestPipeline.create();
      PCollection<Long> createOne = p.apply("CreateOne", Create.of(1L, 2L, 3L));
  
      PCollectionList<Long> list = PCollectionList.of(createOne).and(createOne).and(createOne);
      assertThat(list.expand().values(), containsInAnyOrder(createOne, createOne, createOne));
    }
  
    @Test
    public void testEquals() {
      Pipeline p = TestPipeline.create();
      PCollection<String> first = p.apply("Meta", Create.of("foo", "bar"));
      PCollection<String> second = p.apply("Pythonic", Create.of("spam, ham"));
      PCollection<String> third = p.apply("Syntactic", Create.of("eggs", "baz"));
  
      EqualsTester tester = new EqualsTester();
      //    tester.addEqualityGroup(PCollectionList.empty(p), PCollectionList.empty(p));
      //    tester.addEqualityGroup(PCollectionList.of(first).and(second));
      // Constructors should all produce equivalent
      tester.addEqualityGroup(
          PCollectionList.of(first).and(second).and(third),
          PCollectionList.of(first).and(second).and(third),
          //        PCollectionList.<String>empty(p).and(first).and(second).and(third),
          //        PCollectionList.of(ImmutableList.of(first, second, third)),
          //        PCollectionList.of(first).and(ImmutableList.of(second, third)),
          PCollectionList.of(ImmutableList.of(first, second)).and(third));
      // Order is considered
      tester.addEqualityGroup(PCollectionList.of(first).and(third).and(second));
      tester.addEqualityGroup(PCollectionList.empty(TestPipeline.create()));
  
      tester.testEquals();
    }
  
    @Test
    public void testTagNames() {
      Pipeline p = TestPipeline.create();
      PCollection<String> first = p.apply("first", Create.of("1"));
      PCollection<String> second = p.apply("second", Create.of("2"));
      PCollection<String> third = p.apply("third", Create.of("3"));
  
      PCollectionList<String> list = PCollectionList.of(first).and(second).and(third);
      assertThat(list.pcollections.get(0).getTag().id, equalTo("0"));
      assertThat(list.pcollections.get(1).getTag().id, equalTo("1"));
      assertThat(list.pcollections.get(2).getTag().id, equalTo("2"));
    }
  }
  