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.util.construction;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkArgument;
  
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.model.pipeline.v1.SchemaApi;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.IterableCoder;
  import org.apache.beam.sdk.coders.KvCoder;
  import org.apache.beam.sdk.coders.LengthPrefixCoder;
  import org.apache.beam.sdk.coders.NullableCoder;
  import org.apache.beam.sdk.coders.RowCoder;
  import org.apache.beam.sdk.coders.TimestampPrefixingWindowCoder;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.schemas.SchemaTranslation;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.util.InstanceBuilder;
  import org.apache.beam.sdk.util.ShardedKey;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.beam.sdk.values.WindowedValues.FullWindowedValueCoder;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.InvalidProtocolBufferException;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  
  /** {@link CoderTranslator} implementations for known coder types. */
  class CoderTranslators {
    private CoderTranslators() {}
  
    static <T extends Coder<?>> CoderTranslator<T> atomic(final Class<T> clazz) {
      return new SimpleStructuredCoderTranslator<T>() {
        @Override
        public List<? extends Coder<?>> getComponents(T from) {
          return Collections.emptyList();
        }
  
        @Override
        public T fromComponents(List<Coder<?>> components) {
          return InstanceBuilder.ofType(clazz).build();
        }
      };
    }
  
    static CoderTranslator<KvCoder<?, ?>> kv() {
      return new SimpleStructuredCoderTranslator<KvCoder<?, ?>>() {
        @Override
        public List<? extends Coder<?>> getComponents(KvCoder<?, ?> from) {
          return ImmutableList.of(from.getKeyCoder(), from.getValueCoder());
        }
  
        @Override
        public KvCoder<?, ?> fromComponents(List<Coder<?>> components) {
          return KvCoder.of(components.get(0), components.get(1));
        }
      };
    }
  
    static CoderTranslator<IterableCoder<?>> iterable() {
      return new SimpleStructuredCoderTranslator<IterableCoder<?>>() {
        @Override
        public List<? extends Coder<?>> getComponents(IterableCoder<?> from) {
          return Collections.singletonList(from.getElemCoder());
        }
  
        @Override
        public IterableCoder<?> fromComponents(List<Coder<?>> components) {
          return IterableCoder.of(components.get(0));
        }
      };
    }
  
    static CoderTranslator<Timer.Coder<?>> timer() {
      return new SimpleStructuredCoderTranslator<Timer.Coder<?>>() {
        @Override
        public List<? extends Coder<?>> getComponents(Timer.Coder<?> from) {
          return from.getComponents();
        }
  
        @Override
        public Timer.Coder<?> fromComponents(List<Coder<?>> components) {
          return Timer.Coder.of(components.get(0), (Coder<BoundedWindow>) components.get(1));
        }
      };
    }
  
    static CoderTranslator<LengthPrefixCoder<?>> lengthPrefix() {
      return new SimpleStructuredCoderTranslator<LengthPrefixCoder<?>>() {
        @Override
        public List<? extends Coder<?>> getComponents(LengthPrefixCoder<?> from) {
          return Collections.singletonList(from.getValueCoder());
        }
  
        @Override
        public LengthPrefixCoder<?> fromComponents(List<Coder<?>> components) {
          return LengthPrefixCoder.of(components.get(0));
        }
      };
    }
  
    static CoderTranslator<FullWindowedValueCoder<?>> fullWindowedValue() {
      return new SimpleStructuredCoderTranslator<FullWindowedValueCoder<?>>() {
        @Override
        public List<? extends Coder<?>> getComponents(FullWindowedValueCoder<?> from) {
          return ImmutableList.of(from.getValueCoder(), from.getWindowCoder());
        }
  
        @Override
        public FullWindowedValueCoder<?> fromComponents(List<Coder<?>> components) {
          return WindowedValues.getFullCoder(
              components.get(0), (Coder<BoundedWindow>) components.get(1));
        }
      };
    }
  
    static CoderTranslator<WindowedValues.ParamWindowedValueCoder<?>> paramWindowedValue() {
      return new CoderTranslator<WindowedValues.ParamWindowedValueCoder<?>>() {
        @Override
        public List<? extends Coder<?>> getComponents(
            WindowedValues.ParamWindowedValueCoder<?> from) {
          return ImmutableList.of(from.getValueCoder(), from.getWindowCoder());
        }
  
        @Override
        public byte[] getPayload(WindowedValues.ParamWindowedValueCoder<?> from) {
          return WindowedValues.ParamWindowedValueCoder.getPayload(from);
        }
  
        @Override
        public WindowedValues.ParamWindowedValueCoder<?> fromComponents(
            List<Coder<?>> components, byte[] payload, CoderTranslation.TranslationContext context) {
          return WindowedValues.ParamWindowedValueCoder.fromComponents(components, payload);
        }
      };
    }
  
    static CoderTranslator<RowCoder> row() {
      return new CoderTranslator<RowCoder>() {
        @Override
        public List<? extends Coder<?>> getComponents(RowCoder from) {
          return ImmutableList.of();
        }
  
        @Override
        public byte[] getPayload(RowCoder from) {
          return SchemaTranslation.schemaToProto(from.getSchema(), true).toByteArray();
        }
  
        @Override
        public RowCoder fromComponents(
            List<Coder<?>> components, byte[] payload, CoderTranslation.TranslationContext context) {
          checkArgument(
              components.isEmpty(), "Expected empty component list, but received: " + components);
          Schema schema;
          try {
            schema = SchemaTranslation.schemaFromProto(SchemaApi.Schema.parseFrom(payload));
          } catch (InvalidProtocolBufferException e) {
            throw new RuntimeException("Unable to parse schema for RowCoder: ", e);
          }
          return RowCoder.of(schema);
        }
      };
    }
  
    static CoderTranslator<ShardedKey.Coder<?>> shardedKey() {
      return new SimpleStructuredCoderTranslator<ShardedKey.Coder<?>>() {
        @Override
        public List<? extends Coder<?>> getComponents(ShardedKey.Coder<?> from) {
          return Collections.singletonList(from.getKeyCoder());
        }
  
        @Override
        public ShardedKey.Coder<?> fromComponents(List<Coder<?>> components) {
          return ShardedKey.Coder.of(components.get(0));
        }
      };
    }
  
    static CoderTranslator<TimestampPrefixingWindowCoder<?>> timestampPrefixingWindow() {
      return new SimpleStructuredCoderTranslator<TimestampPrefixingWindowCoder<?>>() {
        @Override
        protected TimestampPrefixingWindowCoder<?> fromComponents(List<Coder<?>> components) {
          return TimestampPrefixingWindowCoder.of((Coder<? extends BoundedWindow>) components.get(0));
        }
  
        @Override
        public List<? extends Coder<?>> getComponents(TimestampPrefixingWindowCoder<?> from) {
          return from.getComponents();
        }
      };
    }
  
    static CoderTranslator<NullableCoder<?>> nullable() {
      return new SimpleStructuredCoderTranslator<NullableCoder<?>>() {
        @Override
        protected NullableCoder<?> fromComponents(List<Coder<?>> components) {
          checkArgument(
              components.size() == 1, "Expected one component, but received: " + components);
          return NullableCoder.of(components.get(0));
        }
  
        @Override
        public List<? extends Coder<?>> getComponents(NullableCoder<?> from) {
          return from.getComponents();
        }
      };
    }
  
    public abstract static class SimpleStructuredCoderTranslator<T extends Coder<?>>
        implements CoderTranslator<T> {
      @Override
      public final T fromComponents(
          List<Coder<?>> components, byte[] payload, CoderTranslation.TranslationContext context) {
        return fromComponents(components);
      }
  
      protected abstract T fromComponents(List<Coder<?>> components);
    }
  }
  