/*
 * 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.adapter.jdbc.consumer;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.apache.arrow.vector.TinyIntVector;

/**
 * Consumer which consume tinyInt type values from {@link ResultSet}.
 * Write the data to {@link org.apache.arrow.vector.TinyIntVector}.
 */
public abstract class TinyIntConsumer {

  /**
   * Creates a consumer for {@link TinyIntVector}.
   */
  public static JdbcConsumer<TinyIntVector> createConsumer(TinyIntVector vector, int index, boolean nullable) {
    if (nullable) {
      return new NullableTinyIntConsumer(vector, index);
    } else {
      return new NonNullableTinyIntConsumer(vector, index);
    }
  }

  /**
   * Nullable consumer for tiny int.
   */
  static class NullableTinyIntConsumer extends BaseConsumer<TinyIntVector> {

    /**
     * Instantiate a TinyIntConsumer.
     */
    public NullableTinyIntConsumer(TinyIntVector vector, int index) {
      super(vector, index);
    }

    @Override
    public void consume(ResultSet resultSet) throws SQLException {
      byte value = resultSet.getByte(columnIndexInResultSet);
      if (!resultSet.wasNull()) {
        vector.setSafe(currentIndex, value);
      }
      currentIndex++;
    }
  }

  /**
   * Non-nullable consumer for tiny int.
   */
  static class NonNullableTinyIntConsumer extends BaseConsumer<TinyIntVector> {

    /**
     * Instantiate a TinyIntConsumer.
     */
    public NonNullableTinyIntConsumer(TinyIntVector vector, int index) {
      super(vector, index);
    }

    @Override
    public void consume(ResultSet resultSet) throws SQLException {
      byte value = resultSet.getByte(columnIndexInResultSet);
      vector.setSafe(currentIndex, value);
      currentIndex++;
    }
  }
}
