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;
  
  import java.util.List;
  import org.apache.beam.sdk.extensions.sql.impl.BeamTableStatistics;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rex.RexNode;
  
  /** Basic implementation of {@link BeamSqlTable}. */
  public abstract class BaseBeamTable implements BeamSqlTable {
  
    @Override
    public BeamTableStatistics getTableStatistics(PipelineOptions options) {
      return BeamTableStatistics.BOUNDED_UNKNOWN;
    }
  
    @Override
    public PCollection<Row> buildIOReader(
        PBegin begin, BeamSqlTableFilter filters, List<String> fieldNames) {
      String error = "%s does not support predicate/project push-down, yet non-empty %s is passed.";
  
      if (!(filters instanceof DefaultTableFilter)) {
        throw new UnsupportedOperationException(
            String.format(error, this.getClass().getName(), "'filters'"));
      }
  
      if (!fieldNames.isEmpty()) {
        throw new UnsupportedOperationException(
            String.format(error, this.getClass().getName(), "'fieldNames'"));
      }
  
      return buildIOReader(begin);
    }
  
    @Override
    public BeamSqlTableFilter constructFilter(List<RexNode> filter) {
      return new DefaultTableFilter(filter);
    }
  
    @Override
    public ProjectSupport supportsProjects() {
      return ProjectSupport.NONE;
    }
  }
  