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 com.google.auto.service.AutoService;
  import java.io.IOException;
  import java.util.Collections;
  import java.util.Map;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.util.construction.NativeTransforms;
  import org.apache.beam.sdk.util.construction.PTransformTranslation;
  import org.apache.beam.sdk.util.construction.SdkComponents;
  import org.apache.beam.sdk.util.construction.TransformPayloadTranslatorRegistrar;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.ByteString;
  
  /**
   * A Beam PTransform used for marking an input that comes from Flink.
   *
   * @param <T>
   */
  /*package private*/ class FlinkInput<T> extends PTransform<PBegin, PCollection<T>> {
    public static final String URN = "beam:flink:internal:translation_input";
  
    private final String identifier;
  
    private final Coder<T> coder;
  
    private final boolean isBounded;
  
    FlinkInput(String identifier, Coder<T> coder, boolean isBounded) {
      this.identifier = identifier;
      this.coder = coder;
      this.isBounded = isBounded;
    }
  
    @Override
    public PCollection<T> expand(PBegin input) {
      return PCollection.createPrimitiveOutputInternal(
          input.getPipeline(),
          WindowingStrategy.globalDefault(),
          isBounded ? PCollection.IsBounded.BOUNDED : PCollection.IsBounded.UNBOUNDED,
          coder);
    }
  
    // This Translator translates this kind of PTransform into a Beam proto representation.
    @AutoService(TransformPayloadTranslatorRegistrar.class)
    public static class Translator
        implements PTransformTranslation.TransformPayloadTranslator<FlinkInput<?>>,
            TransformPayloadTranslatorRegistrar {
      @Override
      public String getUrn() {
        return URN;
      }
  
      @Override
      @SuppressWarnings("nullness") // TODO(https://github.com/apache/beam/issues/20497)
      public RunnerApi.FunctionSpec translate(
          AppliedPTransform<?, ?, FlinkInput<?>> application, SdkComponents components)
          throws IOException {
        return RunnerApi.FunctionSpec.newBuilder()
            .setUrn(FlinkInput.URN)
            .setPayload(ByteString.copyFromUtf8(application.getTransform().identifier))
            .build();
      }
  
      @Override
      @SuppressWarnings("rawtypes")
      public Map<
              ? extends Class<? extends PTransform>,
              ? extends PTransformTranslation.TransformPayloadTranslator>
          getTransformPayloadTranslators() {
        return Collections.singletonMap(FlinkInput.class, this);
      }
    }
  
    @AutoService(NativeTransforms.IsNativeTransform.class)
    public static class FlinkInputOutputIsNativeTransform
        implements NativeTransforms.IsNativeTransform {
      @Override
      public boolean test(RunnerApi.PTransform pTransform) {
        return FlinkInput.URN.equals(PTransformTranslation.urnForTransformOrNull(pTransform));
      }
    }
  }
  