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/*
 * Copyright 2014 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.way.sql;

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

import com.google.common.base.Optional;

/**
 * @author [email protected] (Marcio Endo)
 */
public abstract class Generated {

  private Optional value = Optional.absent();

  private Generated() {
  }

  public static Generated integer() {
    return new GeneratedInteger();
  }

  public T get() {
    return value.get();
  }

  public T or(T defaultValue) {
    return value.or(defaultValue);
  }

  abstract void bind(PlaceholderSetter setter) throws SqlException;

  void extract(ResultSet rs) throws SQLException {
    extract(rs, 1);
  }

  abstract void extract(ResultSet rs, int index) throws SQLException;

  void set(T value) {
    this.value = Optional. of(value);
  }

  private static class GeneratedInteger extends Generated {

    @Override
    void bind(PlaceholderSetter setter) throws SqlException {
      setter.integer(get());
    }

    @Override
    void extract(ResultSet rs, int index) throws SQLException {
      set(rs.getInt(index));
    }

  }

}