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.samza.util;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.samza.serializers.Serde;
  
  /** Utils for Coders creation/conversion in Samza. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class SamzaCoders {
  
    private SamzaCoders() {}
  
    public static <T> Coder<WindowedValue<T>> of(PCollection<T> pCollection) {
      final Coder<T> coder = pCollection.getCoder();
      final Coder<? extends BoundedWindow> windowCoder =
          pCollection.getWindowingStrategy().getWindowFn().windowCoder();
      return WindowedValues.FullWindowedValueCoder.of(coder, windowCoder);
    }
  
    public static <T> Serde<T> toSerde(final Coder<T> coder) {
      return new Serde<T>() {
        @Override
        public T fromBytes(byte[] bytes) {
          if (bytes != null) {
            final ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
            try {
              return (T) coder.decode(bais);
            } catch (IOException e) {
              throw new RuntimeException(e);
            }
          } else {
            return null;
          }
        }
  
        @Override
        public byte[] toBytes(T t) {
          if (t != null) {
            final ByteArrayOutputStream baos = new ByteArrayOutputStream();
            try {
              coder.encode(t, baos);
            } catch (IOException e) {
              throw new RuntimeException(e);
            }
            return baos.toByteArray();
          } else {
            return null;
          }
        }
      };
    }
  }
  