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.coders;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  
  import java.io.Serializable;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  import org.apache.beam.sdk.testing.CoderProperties;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Lists;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Sets;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link DelegateCoder}. */
  @RunWith(JUnit4.class)
  public class DelegateCoderTest implements Serializable {
  
    private static final List<Set<Integer>> TEST_VALUES =
        Arrays.asList(
            Collections.emptySet(),
            Collections.singleton(13),
            new HashSet<>(Arrays.asList(31, -5, 83)));
  
    private static final TypeDescriptor<Set<Integer>> SET_INTEGER_TYPE_DESCRIPTOR =
        new TypeDescriptor<Set<Integer>>() {};
  
    private static final DelegateCoder<Set<Integer>, List<Integer>> TEST_CODER =
        DelegateCoder.of(
            ListCoder.of(VarIntCoder.of()),
            new DelegateCoder.CodingFunction<Set<Integer>, List<Integer>>() {
              @Override
              public List<Integer> apply(Set<Integer> input) {
                return Lists.newArrayList(input);
              }
  
              @Override
              public boolean equals(@Nullable Object o) {
                return o != null && this.getClass() == o.getClass();
              }
  
              @Override
              public int hashCode() {
                return this.getClass().hashCode();
              }
            },
            new DelegateCoder.CodingFunction<List<Integer>, Set<Integer>>() {
              @Override
              public Set<Integer> apply(List<Integer> input) {
                return Sets.newHashSet(input);
              }
  
              @Override
              public boolean equals(@Nullable Object o) {
                return o != null && this.getClass() == o.getClass();
              }
  
              @Override
              public int hashCode() {
                return this.getClass().hashCode();
              }
            },
            SET_INTEGER_TYPE_DESCRIPTOR);
  
    @Test
    public void testDeterministic() throws Exception {
      for (Set<Integer> value : TEST_VALUES) {
        CoderProperties.coderDeterministic(TEST_CODER, value, Sets.newHashSet(value));
      }
    }
  
    @Test
    public void testDecodeEncodeEqual() throws Exception {
      for (Set<Integer> value : TEST_VALUES) {
        CoderProperties.coderDecodeEncodeEqual(TEST_CODER, value);
      }
    }
  
    @Test
    public void testSerializable() throws Exception {
      CoderProperties.coderSerializable(TEST_CODER);
    }
  
    @Test
    public void testCoderEquals() throws Exception {
      DelegateCoder.CodingFunction<Integer, Integer> identityFn = input -> input;
      Coder<Integer> varIntCoder1 = DelegateCoder.of(VarIntCoder.of(), identityFn, identityFn);
      Coder<Integer> varIntCoder2 = DelegateCoder.of(VarIntCoder.of(), identityFn, identityFn);
      Coder<Integer> bigEndianIntegerCoder =
          DelegateCoder.of(BigEndianIntegerCoder.of(), identityFn, identityFn);
  
      assertEquals(varIntCoder1, varIntCoder2);
      assertEquals(varIntCoder1.hashCode(), varIntCoder2.hashCode());
      assertNotEquals(varIntCoder1, bigEndianIntegerCoder);
      assertNotEquals(varIntCoder1.hashCode(), bigEndianIntegerCoder.hashCode());
    }
  
    @Test
    public void testEncodedTypeDescriptorSimpleEncodedType() throws Exception {
      assertThat(
          DelegateCoder.of(
                  StringUtf8Coder.of(),
                  String::valueOf,
                  Integer::valueOf,
                  new TypeDescriptor<Integer>() {})
              .getEncodedTypeDescriptor(),
          equalTo(TypeDescriptor.of(Integer.class)));
    }
  
    @Test
    public void testEncodedTypeDescriptor() throws Exception {
      TypeDescriptor<Set<Integer>> typeDescriptor = new TypeDescriptor<Set<Integer>>() {};
      assertThat(TEST_CODER.getEncodedTypeDescriptor(), equalTo(typeDescriptor));
    }
  }
  