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   * 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.
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  package org.apache.beam.runners.flink.adapter;
  
  import java.io.IOException;
  import java.util.Map;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.runners.flink.translation.types.CoderTypeInformation;
  import org.apache.beam.runners.fnexecution.wire.LengthPrefixUnknownCoders;
  import org.apache.beam.sdk.coders.CannotProvideCoderException;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.CoderRegistry;
  import org.apache.beam.sdk.coders.IterableCoder;
  import org.apache.beam.sdk.coders.MapCoder;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.util.Preconditions;
  import org.apache.beam.sdk.util.construction.CoderTranslation;
  import org.apache.beam.sdk.util.construction.RehydratedComponents;
  import org.apache.flink.api.common.typeinfo.TypeInformation;
  
  class BeamAdapterCoderUtils {
    static <T> Coder<T> typeInformationToCoder(
        TypeInformation<T> typeInfo, CoderRegistry coderRegistry) {
      Class<T> clazz = typeInfo.getTypeClass();
      if (typeInfo instanceof CoderTypeInformation) {
        return ((CoderTypeInformation) typeInfo).getCoder();
      } else if (clazz.getTypeParameters().length == 0) {
        try {
          return coderRegistry.getCoder(clazz);
        } catch (CannotProvideCoderException exn) {
          throw new RuntimeException(exn);
        }
      } else if (Iterable.class.isAssignableFrom(clazz)) {
        TypeInformation<?> elementType =
            Preconditions.checkArgumentNotNull(typeInfo.getGenericParameters().get("T"));
        return (Coder) IterableCoder.of(typeInformationToCoder(elementType, coderRegistry));
      } else if (Map.class.isAssignableFrom(clazz)) {
        TypeInformation<?> keyType =
            Preconditions.checkArgumentNotNull(typeInfo.getGenericParameters().get("K"));
        TypeInformation<?> valueType =
            Preconditions.checkArgumentNotNull(typeInfo.getGenericParameters().get("V"));
        return (Coder)
            MapCoder.of(
                typeInformationToCoder(keyType, coderRegistry),
                typeInformationToCoder(valueType, coderRegistry));
      } else {
        throw new RuntimeException("Coder translation for " + typeInfo + " not yet supported.");
      }
    }
  
    static <T> TypeInformation<T> coderToTypeInformation(Coder<T> coder, PipelineOptions options) {
      // TODO(robertwb): Consider mapping some common types.
      return new CoderTypeInformation<>(coder, options);
    }
  
    static <T> Coder<T> lookupCoder(RunnerApi.Pipeline p, String pCollectionId) {
      try {
        return (Coder<T>)
            CoderTranslation.fromProto(
                p.getComponents()
                    .getCodersOrThrow(
                        p.getComponents().getPcollectionsOrThrow(pCollectionId).getCoderId()),
                RehydratedComponents.forComponents(p.getComponents()),
                CoderTranslation.TranslationContext.DEFAULT);
      } catch (IOException exn) {
        throw new RuntimeException(exn);
      }
    }
  
    static void registerKnownCoderFor(RunnerApi.Pipeline p, String pCollectionId) {
      registerAsKnownCoder(p, p.getComponents().getPcollectionsOrThrow(pCollectionId).getCoderId());
    }
  
    static void registerAsKnownCoder(RunnerApi.Pipeline p, String coderId) {
      RunnerApi.Coder coder = p.getComponents().getCodersOrThrow(coderId);
      // It'd be more targeted to note the coder id rather than the URN,
      // but the length prefixing code is invoked within a deeply nested
      // sequence of static method calls.
      LengthPrefixUnknownCoders.addKnownCoderUrn(coder.getSpec().getUrn());
      for (String componentCoderId : coder.getComponentCoderIdsList()) {
        registerAsKnownCoder(p, componentCoderId);
      }
    }
  }
  