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Beam IO for Google Cloud Pub/Sub Lite

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/*
 * Copyright 2020 Google LLC
 *
 * Licensed 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 com.google.cloud.pubsublite.beam;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.beam.sdk.coders.AtomicCoder;
import org.apache.beam.sdk.coders.Coder;
import org.apache.beam.sdk.coders.CoderProvider;
import org.apache.beam.sdk.coders.CoderProviders;
import org.apache.beam.sdk.coders.DelegateCoder;
import org.apache.beam.sdk.extensions.protobuf.ByteStringCoder;
import org.apache.beam.sdk.values.TypeDescriptor;

/** A coder for a Uuid. */
public class UuidCoder extends AtomicCoder {
  private static final Coder CODER =
      DelegateCoder.of(ByteStringCoder.of(), Uuid::value, Uuid::of);

  @Override
  public void encode(Uuid value, OutputStream outStream) throws IOException {
    CODER.encode(value, outStream);
  }

  @Override
  public Uuid decode(InputStream inStream) throws IOException {
    return CODER.decode(inStream);
  }

  public static CoderProvider getCoderProvider() {
    return CoderProviders.forCoder(TypeDescriptor.of(Uuid.class), new UuidCoder());
  }
}