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.runners.flink.adapter;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkNotNull;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import javax.annotation.Nullable;
  import org.apache.beam.runners.flink.translation.types.CoderTypeSerializer;
  import org.apache.beam.runners.flink.translation.wrappers.streaming.FlinkKeyUtils;
  import org.apache.beam.sdk.coders.ByteArrayCoder;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.hash.Hashing;
  import org.apache.flink.core.memory.DataInputView;
  import org.apache.flink.core.memory.DataOutputView;
  import org.apache.flink.types.Value;
  
  public class FlinkKey implements Value {
  
    private final CoderTypeSerializer<byte[]> serializer;
  
    @SuppressWarnings("initialization.fields.uninitialized")
    private ByteBuffer underlying;
  
    public FlinkKey() {
      this.serializer = new CoderTypeSerializer<>(ByteArrayCoder.of(), false);
    }
  
    private FlinkKey(ByteBuffer underlying) {
      this();
      this.underlying = underlying;
    }
  
    public ByteBuffer getSerializedKey() {
      return underlying;
    }
  
    public static FlinkKey of(ByteBuffer bytes) {
      return new FlinkKey(bytes);
    }
  
    public static <K> FlinkKey of(K key, Coder<K> coder) {
      return new FlinkKey(FlinkKeyUtils.encodeKey(key, coder));
    }
  
    @Override
    public void write(DataOutputView out) throws IOException {
      checkNotNull(underlying);
      serializer.serialize(underlying.array(), out);
    }
  
    @Override
    public void read(DataInputView in) throws IOException {
      this.underlying = ByteBuffer.wrap(serializer.deserialize(in));
    }
  
    public <K> K getKey(Coder<K> coder) {
      return FlinkKeyUtils.decodeKey(underlying, coder);
    }
  
    @Override
    public int hashCode() {
      //    return underlying.hashCode();
      return Hashing.murmur3_128().hashBytes(underlying.array()).asInt();
    }
  
    @Override
    public boolean equals(@Nullable Object obj) {
      return obj instanceof FlinkKey && ((FlinkKey) obj).underlying.equals(underlying);
    }
  }
  