/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    Licensed 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.ibatis.executor.statement;
  
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.List;
  
  import org.apache.ibatis.cursor.Cursor;
  import org.apache.ibatis.executor.Executor;
  import org.apache.ibatis.executor.keygen.Jdbc3KeyGenerator;
  import org.apache.ibatis.executor.keygen.KeyGenerator;
  import org.apache.ibatis.executor.keygen.SelectKeyGenerator;
  import org.apache.ibatis.mapping.BoundSql;
  import org.apache.ibatis.mapping.MappedStatement;
  import org.apache.ibatis.mapping.ResultSetType;
  import org.apache.ibatis.session.ResultHandler;
  import org.apache.ibatis.session.RowBounds;
  
  /**
   * @author Clinton Begin
   */
  public class SimpleStatementHandler extends BaseStatementHandler {
  
    public SimpleStatementHandler(Executor executor, MappedStatement mappedStatement, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) {
      super(executor, mappedStatement, parameter, rowBounds, resultHandler, boundSql);
    }
  
    @Override
    public int update(Statement statement) throws SQLException {
      String sql = boundSql.getSql();
      Object parameterObject = boundSql.getParameterObject();
      KeyGenerator keyGenerator = mappedStatement.getKeyGenerator();
      int rows;
      if (keyGenerator instanceof Jdbc3KeyGenerator) {
        statement.execute(sql, Statement.RETURN_GENERATED_KEYS);
        rows = statement.getUpdateCount();
        keyGenerator.processAfter(executor, mappedStatement, statement, parameterObject);
      } else if (keyGenerator instanceof SelectKeyGenerator) {
        statement.execute(sql);
        rows = statement.getUpdateCount();
        keyGenerator.processAfter(executor, mappedStatement, statement, parameterObject);
      } else {
        statement.execute(sql);
        rows = statement.getUpdateCount();
      }
      return rows;
    }
  
    @Override
    public void batch(Statement statement) throws SQLException {
      String sql = boundSql.getSql();
      statement.addBatch(sql);
    }
  
    @Override
    public <E> List<E> query(Statement statement, ResultHandler resultHandler) throws SQLException {
      String sql = boundSql.getSql();
      statement.execute(sql);
      return resultSetHandler.handleResultSets(statement);
    }
  
    @Override
    public <E> Cursor<E> queryCursor(Statement statement) throws SQLException {
      String sql = boundSql.getSql();
      statement.execute(sql);
      return resultSetHandler.handleCursorResultSets(statement);
    }
  
    @Override
    protected Statement instantiateStatement(Connection connection) throws SQLException {
      if (mappedStatement.getResultSetType() == ResultSetType.DEFAULT) {
        return connection.createStatement();
      } else {
        return connection.createStatement(mappedStatement.getResultSetType().getValue(), ResultSet.CONCUR_READ_ONLY);
      }
    }
  
    @Override
    public void parameterize(Statement statement) {
      // N/A
    }
  
  }