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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 static org.hamcrest.Matchers.equalTo;
  
  import java.io.IOException;
  import org.apache.beam.model.pipeline.v1.RunnerApi.Coder;
  import org.apache.beam.model.pipeline.v1.RunnerApi.FunctionSpec;
  import org.apache.beam.model.pipeline.v1.RunnerApi.MessageWithComponents;
  import org.apache.beam.sdk.coders.ByteArrayCoder;
  import org.apache.beam.sdk.coders.IterableCoder;
  import org.apache.beam.sdk.coders.KvCoder;
  import org.apache.beam.sdk.coders.LengthPrefixCoder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.coders.VarIntCoder;
  import org.apache.beam.sdk.coders.VarLongCoder;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow.IntervalWindowCoder;
  import org.apache.beam.sdk.util.construction.ModelCoders.KvCoderComponents;
  import org.apache.beam.sdk.util.construction.ModelCoders.WindowedValueCoderComponents;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.WindowedValues.FullWindowedValueCoder;
  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 ModelCoders}. */
  @RunWith(JUnit4.class)
  public class ModelCodersTest {
    @Rule public ExpectedException thrown = ExpectedException.none();
  
    @Test
    public void windowedValueCoderComponentsToConstructor() throws IOException {
      FullWindowedValueCoder<Iterable<KV<String, Integer>>> javaCoder =
          FullWindowedValueCoder.of(
              IterableCoder.of(KvCoder.of(StringUtf8Coder.of(), VarIntCoder.of())),
              IntervalWindowCoder.of());
  
      MessageWithComponents coderAndComponents = CoderTranslation.toProto(javaCoder);
      WindowedValueCoderComponents windowedValueCoderComponents =
          ModelCoders.getWindowedValueCoderComponents(coderAndComponents.getCoder());
  
      Coder windowedCoder =
          ModelCoders.windowedValueCoder(
              windowedValueCoderComponents.elementCoderId(),
              windowedValueCoderComponents.windowCoderId());
  
      assertThat(windowedCoder, equalTo(coderAndComponents.getCoder()));
    }
  
    @Test
    public void windowedValueCoderComponentsWrongUrn() {
      thrown.expect(IllegalArgumentException.class);
      ModelCoders.getWindowedValueCoderComponents(
          Coder.newBuilder()
              .setSpec(FunctionSpec.newBuilder().setUrn(ModelCoders.LENGTH_PREFIX_CODER_URN))
              .build());
    }
  
    @Test
    public void windowedValueCoderComponentsNoUrn() {
      thrown.expect(IllegalArgumentException.class);
      ModelCoders.getWindowedValueCoderComponents(
          Coder.newBuilder().setSpec(FunctionSpec.getDefaultInstance()).build());
    }
  
    @Test
    public void kvCoderComponentsToConstructor() throws IOException {
      KvCoder<byte[], Iterable<Long>> javaCoder =
          KvCoder.of(ByteArrayCoder.of(), IterableCoder.of(LengthPrefixCoder.of(VarLongCoder.of())));
  
      MessageWithComponents coderAndComponents = CoderTranslation.toProto(javaCoder);
      KvCoderComponents kvCoderComponents =
          ModelCoders.getKvCoderComponents(coderAndComponents.getCoder());
  
      Coder kvCoder =
          ModelCoders.kvCoder(kvCoderComponents.keyCoderId(), kvCoderComponents.valueCoderId());
      assertThat(kvCoder, equalTo(coderAndComponents.getCoder()));
    }
  
    @Test
    public void kvCoderComponentsWrongUrn() {
      thrown.expect(IllegalArgumentException.class);
      ModelCoders.getKvCoderComponents(
          Coder.newBuilder()
              .setSpec(FunctionSpec.newBuilder().setUrn(ModelCoders.LENGTH_PREFIX_CODER_URN))
              .build());
    }
  
    @Test
    public void kvCoderComponentsNoUrn() {
      thrown.expect(IllegalArgumentException.class);
      ModelCoders.getKvCoderComponents(
          Coder.newBuilder().setSpec(FunctionSpec.getDefaultInstance()).build());
    }
  }
  