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.translation.wrappers.streaming;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.List;
  import org.apache.beam.runners.core.KeyedWorkItem;
  import org.apache.beam.runners.core.KeyedWorkItemCoder;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.CoderException;
  import org.apache.beam.sdk.coders.StructuredCoder;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  
  /** Singleton keyed work item coder. */
  public class SingletonKeyedWorkItemCoder<K, ElemT>
      extends StructuredCoder<KeyedWorkItem<K, ElemT>> {
  
    /**
     * Create a new {@link KeyedWorkItemCoder} with the provided key coder, element coder, and window
     * coder.
     */
    public static <K, ElemT> SingletonKeyedWorkItemCoder<K, ElemT> of(
        Coder<K> keyCoder, Coder<ElemT> elemCoder, Coder<? extends BoundedWindow> windowCoder) {
      return new SingletonKeyedWorkItemCoder<>(keyCoder, elemCoder, windowCoder);
    }
  
    private final Coder<K> keyCoder;
    private final Coder<ElemT> elemCoder;
    private final Coder<? extends BoundedWindow> windowCoder;
    private final WindowedValues.FullWindowedValueCoder<ElemT> valueCoder;
  
    private SingletonKeyedWorkItemCoder(
        Coder<K> keyCoder, Coder<ElemT> elemCoder, Coder<? extends BoundedWindow> windowCoder) {
      this.keyCoder = keyCoder;
      this.elemCoder = elemCoder;
      this.windowCoder = windowCoder;
      valueCoder = WindowedValues.FullWindowedValueCoder.of(elemCoder, windowCoder);
    }
  
    public Coder<K> getKeyCoder() {
      return keyCoder;
    }
  
    public Coder<ElemT> getElementCoder() {
      return elemCoder;
    }
  
    @Override
    public void encode(KeyedWorkItem<K, ElemT> value, OutputStream outStream)
        throws CoderException, IOException {
      encode(value, outStream, Context.NESTED);
    }
  
    @Override
    public void encode(KeyedWorkItem<K, ElemT> value, OutputStream outStream, Context context)
        throws CoderException, IOException {
      final SingletonKeyedWorkItem<K, ElemT> cast = (SingletonKeyedWorkItem<K, ElemT>) value;
      keyCoder.encode(cast.key(), outStream);
      valueCoder.encode(cast.value(), outStream, context);
    }
  
    @Override
    public SingletonKeyedWorkItem<K, ElemT> decode(InputStream inStream)
        throws CoderException, IOException {
      return decode(inStream, Context.NESTED);
    }
  
    @Override
    public SingletonKeyedWorkItem<K, ElemT> decode(InputStream inStream, Context context)
        throws CoderException, IOException {
      K key = keyCoder.decode(inStream);
      WindowedValue<ElemT> value = valueCoder.decode(inStream, context);
      return new SingletonKeyedWorkItem<>(key, value);
    }
  
    @Override
    public List<? extends Coder<?>> getCoderArguments() {
      return ImmutableList.of(keyCoder, elemCoder, windowCoder);
    }
  
    @Override
    public void verifyDeterministic() throws NonDeterministicException {
      keyCoder.verifyDeterministic();
      elemCoder.verifyDeterministic();
      windowCoder.verifyDeterministic();
    }
  
    /**
     * {@inheritDoc}.
     *
     * <p>{@link KeyedWorkItemCoder} is not consistent with equals as it can return a {@link
     * KeyedWorkItem} of a type different from the originally encoded type.
     */
    @Override
    public boolean consistentWithEquals() {
      return false;
    }
  }
  