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.jdbc;
  
  import org.apache.calcite.avatica.AvaticaStatement;
  import org.apache.calcite.avatica.Meta;
  import org.apache.calcite.avatica.NoSuchStatementException;
  import org.apache.calcite.linq4j.Queryable;
  import org.apache.calcite.server.CalciteServerStatement;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.sql.SQLException;
  
  /**
   * Implementation of {@link java.sql.Statement}
   * for the Calcite engine.
   */
  public abstract class CalciteStatement extends AvaticaStatement {
    /**
     * Creates a CalciteStatement.
     *
     * @param connection Connection
     * @param h Statement handle
     * @param resultSetType Result set type
     * @param resultSetConcurrency Result set concurrency
     * @param resultSetHoldability Result set holdability
     */
    CalciteStatement(CalciteConnectionImpl connection, Meta.@Nullable StatementHandle h,
        int resultSetType, int resultSetConcurrency, int resultSetHoldability) {
      super(connection, h, resultSetType, resultSetConcurrency,
          resultSetHoldability);
    }
  
    // implement Statement
  
    @Override public <T> T unwrap(Class<T> iface) throws SQLException {
      if (iface == CalciteServerStatement.class) {
        final CalciteServerStatement statement;
        try {
          statement = getConnection().server.getStatement(handle);
        } catch (NoSuchStatementException e) {
          throw new AssertionError("invalid statement", e);
        }
        return iface.cast(statement);
      }
      return super.unwrap(iface);
    }
  
    @Override public CalciteConnectionImpl getConnection() {
      return (CalciteConnectionImpl) connection;
    }
  
    protected <T> CalcitePrepare.CalciteSignature<T> prepare(
        Queryable<T> queryable) {
      final CalciteConnectionImpl calciteConnection = getConnection();
      final CalcitePrepare prepare = calciteConnection.prepareFactory.get();
      final CalciteServerStatement serverStatement;
      try {
        serverStatement = calciteConnection.server.getStatement(handle);
      } catch (NoSuchStatementException e) {
        throw new AssertionError("invalid statement", e);
      }
      final CalcitePrepare.Context prepareContext =
          serverStatement.createPrepareContext();
      return prepare.prepareQueryable(prepareContext, queryable);
    }
  
    @Override protected void close_() {
      if (!closed) {
        ((CalciteConnectionImpl) connection).server.removeStatement(handle);
        super.close_();
      }
    }
  }
  