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   * 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.
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  package org.apache.beam.sdk.util.construction;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.beam.sdk.coders.VoidCoder;
  import org.apache.beam.sdk.io.GenerateSequence;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.transforms.resourcehints.ResourceHints;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PDone;
  import org.apache.beam.sdk.values.PInput;
  import org.apache.beam.sdk.values.POutput;
  import org.apache.beam.sdk.values.PValue;
  import org.apache.beam.sdk.values.TupleTag;
  import org.hamcrest.Matchers;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link TransformInputs}. */
  @RunWith(JUnit4.class)
  public class TransformInputsTest {
    @Rule public TestPipeline pipeline = TestPipeline.create().enableAbandonedNodeEnforcement(false);
    @Rule public ExpectedException thrown = ExpectedException.none();
  
    @Test
    public void nonAdditionalInputsWithNoInputSucceeds() {
      AppliedPTransform<PInput, POutput, TestTransform> transform =
          AppliedPTransform.of(
              "input-free",
              Collections.emptyMap(),
              Collections.emptyMap(),
              new TestTransform(),
              ResourceHints.create(),
              pipeline);
  
      assertThat(TransformInputs.nonAdditionalInputs(transform), Matchers.empty());
    }
  
    @Test
    public void nonAdditionalInputsWithOneMainInputSucceeds() {
      PCollection<Long> input = pipeline.apply(GenerateSequence.from(1L));
      AppliedPTransform<PInput, POutput, TestTransform> transform =
          AppliedPTransform.of(
              "input-single",
              Collections.singletonMap(new TupleTag<Long>() {}, input),
              Collections.emptyMap(),
              new TestTransform(),
              ResourceHints.create(),
              pipeline);
  
      assertThat(TransformInputs.nonAdditionalInputs(transform), Matchers.containsInAnyOrder(input));
    }
  
    @Test
    public void nonAdditionalInputsWithMultipleNonAdditionalInputsSucceeds() {
      Map<TupleTag<?>, PCollection<?>> allInputs = new HashMap<>();
      PCollection<Integer> mainInts = pipeline.apply("MainInput", Create.of(12, 3));
      allInputs.put(new TupleTag<Integer>() {}, mainInts);
      PCollection<Void> voids = pipeline.apply("VoidInput", Create.empty(VoidCoder.of()));
      allInputs.put(new TupleTag<Void>() {}, voids);
      AppliedPTransform<PInput, POutput, TestTransform> transform =
          AppliedPTransform.of(
              "additional-free",
              allInputs,
              Collections.emptyMap(),
              new TestTransform(),
              ResourceHints.create(),
              pipeline);
  
      assertThat(
          TransformInputs.nonAdditionalInputs(transform),
          Matchers.containsInAnyOrder(voids, mainInts));
    }
  
    @Test
    public void nonAdditionalInputsWithAdditionalInputsSucceeds() {
      Map<TupleTag<?>, PValue> additionalInputs = new HashMap<>();
      additionalInputs.put(new TupleTag<String>() {}, pipeline.apply(Create.of("1, 2", "3")));
      additionalInputs.put(new TupleTag<Long>() {}, pipeline.apply(GenerateSequence.from(3L)));
  
      Map<TupleTag<?>, PCollection<?>> allInputs = new HashMap<>();
      PCollection<Integer> mainInts = pipeline.apply("MainInput", Create.of(12, 3));
      allInputs.put(new TupleTag<Integer>() {}, mainInts);
      PCollection<Void> voids = pipeline.apply("VoidInput", Create.empty(VoidCoder.of()));
      allInputs.put(new TupleTag<Void>() {}, voids);
      allInputs.putAll((Map) additionalInputs);
  
      AppliedPTransform<PInput, POutput, TestTransform> transform =
          AppliedPTransform.of(
              "additional",
              allInputs,
              Collections.emptyMap(),
              new TestTransform(additionalInputs),
              ResourceHints.create(),
              pipeline);
  
      assertThat(
          TransformInputs.nonAdditionalInputs(transform),
          Matchers.containsInAnyOrder(mainInts, voids));
    }
  
    @Test
    public void nonAdditionalInputsWithOnlyAdditionalInputsThrows() {
      Map<TupleTag<?>, PCollection<?>> additionalInputs = new HashMap<>();
      additionalInputs.put(new TupleTag<String>() {}, pipeline.apply(Create.of("1, 2", "3")));
      additionalInputs.put(new TupleTag<Long>() {}, pipeline.apply(GenerateSequence.from(3L)));
  
      AppliedPTransform<PInput, POutput, TestTransform> transform =
          AppliedPTransform.of(
              "additional-only",
              additionalInputs,
              Collections.emptyMap(),
              new TestTransform((Map) additionalInputs),
              ResourceHints.create(),
              pipeline);
  
      thrown.expect(IllegalArgumentException.class);
      thrown.expectMessage("at least one");
      TransformInputs.nonAdditionalInputs(transform);
    }
  
    private static class TestTransform extends PTransform<PInput, POutput> {
      private final Map<TupleTag<?>, PValue> additionalInputs;
  
      private TestTransform() {
        this(Collections.emptyMap());
      }
  
      private TestTransform(Map<TupleTag<?>, PValue> additionalInputs) {
        this.additionalInputs = additionalInputs;
      }
  
      @Override
      public POutput expand(PInput input) {
        return PDone.in(input.getPipeline());
      }
  
      @Override
      public Map<TupleTag<?>, PValue> getAdditionalInputs() {
        return additionalInputs;
      }
    }
  }
  