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.arrow.flight.sql.example;
  
  import java.sql.Connection;
  import java.sql.Statement;
  import java.util.Objects;
  import org.apache.arrow.flight.sql.FlightSqlProducer;
  import org.apache.arrow.util.AutoCloseables;
  
  /**
   * Context for {@link T} to be persisted in memory in between {@link FlightSqlProducer} calls.
   *
   * @param <T> the {@link Statement} to be persisted.
   */
  public final class StatementContext<T extends Statement> implements AutoCloseable {
  
    private final T statement;
    private final String query;
  
    public StatementContext(final T statement, final String query) {
      this.statement = Objects.requireNonNull(statement, "statement cannot be null.");
      this.query = query;
    }
  
    /**
     * Gets the statement wrapped by this {@link StatementContext}.
     *
     * @return the inner statement.
     */
    public T getStatement() {
      return statement;
    }
  
    /**
     * Gets the optional SQL query wrapped by this {@link StatementContext}.
     *
     * @return the SQL query if present; empty otherwise.
     */
    public String getQuery() {
      return query;
    }
  
    @Override
    public void close() throws Exception {
      Connection connection = statement.getConnection();
      AutoCloseables.close(statement, connection);
    }
  
    @Override
    public boolean equals(final Object other) {
      if (this == other) {
        return true;
      }
      if (!(other instanceof StatementContext)) {
        return false;
      }
      final StatementContext<?> that = (StatementContext<?>) other;
      return statement.equals(that.statement);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(statement);
    }
  }
  