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.calcite.adapter.spark;
  
  import org.apache.calcite.adapter.jdbc.JdbcConvention;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.convert.ConverterRule;
  import org.apache.calcite.tools.RelBuilderFactory;
  
  /**
   * Rule to convert a relational expression from
   * {@link org.apache.calcite.adapter.jdbc.JdbcConvention} to
   * {@link org.apache.calcite.adapter.spark.SparkRel#CONVENTION Spark convention}.
   */
  public class JdbcToSparkConverterRule extends ConverterRule {
    /** Creates a JdbcToSparkConverterRule. */
    public static JdbcToSparkConverterRule create(JdbcConvention out) {
      return Config.INSTANCE
          .withConversion(RelNode.class, out, SparkRel.CONVENTION,
              "JdbcToSparkConverterRule")
          .withRuleFactory(JdbcToSparkConverterRule::new)
          .toRule(JdbcToSparkConverterRule.class);
    }
  
    @Deprecated // to be removed before 2.0
    public JdbcToSparkConverterRule(JdbcConvention out,
        RelBuilderFactory relBuilderFactory) {
      this(create(out).config.withRelBuilderFactory(relBuilderFactory)
          .as(Config.class));
    }
  
    /** Called from the Config. */
    protected JdbcToSparkConverterRule(Config config) {
      super(config);
    }
  
    @Override public RelNode convert(RelNode rel) {
      RelTraitSet newTraitSet = rel.getTraitSet().replace(getOutTrait());
      return new JdbcToSparkConverter(rel.getCluster(), newTraitSet, rel);
    }
  }
  