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 java.io.DataInputStream;
  import java.io.DataOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import org.apache.beam.sdk.testing.CoderProperties;
  import org.apache.beam.sdk.util.CoderUtils;
  import org.apache.beam.sdk.util.SerializableUtils;
  import org.apache.beam.sdk.values.KV;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.junit.Assert;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link CustomCoder}. */
  @RunWith(JUnit4.class)
  public class CustomCoderTest {
  
    @Rule public ExpectedException thrown = ExpectedException.none();
  
    private static class MyCustomCoder extends CustomCoder<KV<String, Long>> {
      private final String key;
  
      public MyCustomCoder(String key) {
        this.key = key;
      }
  
      @Override
      public void encode(KV<String, Long> kv, OutputStream out) throws IOException {
        new DataOutputStream(out).writeLong(kv.getValue());
      }
  
      @Override
      public KV<String, Long> decode(InputStream inStream) throws IOException {
        return KV.of(key, new DataInputStream(inStream).readLong());
      }
  
      @Override
      public boolean equals(@Nullable Object other) {
        return other instanceof MyCustomCoder && key.equals(((MyCustomCoder) other).key);
      }
  
      @Override
      public int hashCode() {
        return key.hashCode();
      }
    }
  
    @Test
    public void testEncodeDecode() throws Exception {
      MyCustomCoder coder = new MyCustomCoder("key");
      CoderProperties.coderDecodeEncodeEqual(coder, KV.of("key", 3L));
  
      byte[] encoded2 = CoderUtils.encodeToByteArray(coder, KV.of("ignored", 3L));
      Assert.assertEquals(KV.of("key", 3L), CoderUtils.decodeFromByteArray(coder, encoded2));
    }
  
    @Test
    public void testEncodable() throws Exception {
      SerializableUtils.ensureSerializable(new MyCustomCoder("key"));
    }
  }
  