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.jdbc;
  
  import org.apache.calcite.plan.Convention;
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.plan.RelOptTable;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.core.TableScan;
  import org.apache.calcite.rel.hint.RelHint;
  
  import com.google.common.collect.ImmutableList;
  
  import java.util.List;
  
  import static org.apache.calcite.linq4j.Nullness.castNonNull;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Relational expression representing a scan of a table in a JDBC data source.
   */
  public class JdbcTableScan extends TableScan implements JdbcRel {
    public final JdbcTable jdbcTable;
  
    protected JdbcTableScan(
        RelOptCluster cluster,
        List<RelHint> hints,
        RelOptTable table,
        JdbcTable jdbcTable,
        JdbcConvention jdbcConvention) {
      super(cluster, cluster.traitSetOf(jdbcConvention), hints, table);
      this.jdbcTable = requireNonNull(jdbcTable, "jdbcTable");
    }
  
    @Override public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
      assert inputs.isEmpty();
      return new JdbcTableScan(
          getCluster(), getHints(), table, jdbcTable, (JdbcConvention) castNonNull(getConvention()));
    }
  
    @Override public JdbcImplementor.Result implement(JdbcImplementor implementor) {
      return implementor.result(jdbcTable.tableName(),
          ImmutableList.of(JdbcImplementor.Clause.FROM), this, null);
    }
  
    @Override public RelNode withHints(List<RelHint> hintList) {
      Convention convention = requireNonNull(getConvention(), "getConvention()");
      return new JdbcTableScan(getCluster(), hintList, getTable(), jdbcTable,
          (JdbcConvention) convention);
    }
  }
  