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.extensions.sql.meta.provider.pubsublite;
  
  import com.google.cloud.pubsublite.TopicPath;
  import com.google.cloud.pubsublite.proto.PubSubMessage;
  import org.apache.beam.sdk.extensions.sql.impl.BeamTableStatistics;
  import org.apache.beam.sdk.extensions.sql.meta.SchemaBaseBeamTable;
  import org.apache.beam.sdk.io.gcp.pubsublite.PublisherOptions;
  import org.apache.beam.sdk.io.gcp.pubsublite.PubsubLiteIO;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollection.IsBounded;
  import org.apache.beam.sdk.values.POutput;
  import org.apache.beam.sdk.values.Row;
  
  class PubsubLiteTopicTable extends SchemaBaseBeamTable {
    private final TopicPath topic;
    private final PTransform<PCollection<? extends Row>, PCollection<PubSubMessage>> transform;
  
    PubsubLiteTopicTable(
        Schema schema,
        TopicPath topic,
        PTransform<PCollection<? extends Row>, PCollection<PubSubMessage>> transform) {
      super(schema);
      this.topic = topic;
      this.transform = transform;
    }
  
    @Override
    public PCollection<Row> buildIOReader(PBegin begin) {
      throw new UnsupportedOperationException(
          "You cannot read from a Pub/Sub Lite topic: you must create a subscription first.");
    }
  
    @Override
    public POutput buildIOWriter(PCollection<Row> input) {
      return input
          .apply("Transform to PubSubMessage", transform)
          .apply(
              "Write Pub/Sub Lite",
              PubsubLiteIO.write(PublisherOptions.newBuilder().setTopicPath(topic).build()));
    }
  
    @Override
    public IsBounded isBounded() {
      return IsBounded.UNBOUNDED;
    }
  
    @Override
    public BeamTableStatistics getTableStatistics(PipelineOptions options) {
      return BeamTableStatistics.UNBOUNDED_UNKNOWN;
    }
  }
  