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.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.Arrays;
  import java.util.List;
  import org.apache.beam.sdk.values.ShardedKey;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting;
  
  /** A {@link Coder} for {@link ShardedKey}, using a wrapped key {@link Coder}. */
  @VisibleForTesting
  public class ShardedKeyCoder<KeyT> extends StructuredCoder<ShardedKey<KeyT>> {
    public static <KeyT> ShardedKeyCoder<KeyT> of(Coder<KeyT> keyCoder) {
      return new ShardedKeyCoder<>(keyCoder);
    }
  
    private final Coder<KeyT> keyCoder;
    private final VarIntCoder shardNumberCoder;
  
    protected ShardedKeyCoder(Coder<KeyT> keyCoder) {
      this.keyCoder = keyCoder;
      this.shardNumberCoder = VarIntCoder.of();
    }
  
    @Override
    public List<? extends Coder<?>> getCoderArguments() {
      return Arrays.asList(keyCoder);
    }
  
    @Override
    public void encode(ShardedKey<KeyT> key, OutputStream outStream) throws IOException {
      keyCoder.encode(key.getKey(), outStream);
      shardNumberCoder.encode(key.getShardNumber(), outStream);
    }
  
    @Override
    public ShardedKey<KeyT> decode(InputStream inStream) throws IOException {
      return ShardedKey.of(keyCoder.decode(inStream), shardNumberCoder.decode(inStream));
    }
  
    @Override
    public void verifyDeterministic() throws NonDeterministicException {
      keyCoder.verifyDeterministic();
    }
  }
  