br.com.objectos.way.sql.OrderByDef Maven / Gradle / Ivy

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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 static com.google.common.collect.Lists.newArrayList;

import java.util.List;

import com.google.common.base.Optional;
import com.google.common.base.Preconditions;

/**
 * @author [email protected] (Marcio Endo)
 */
class OrderByDef {

  private final List orderList = newArrayList();

  public boolean add(CanOrderBy e) {
    Preconditions.checkNotNull(e);
    return orderList.add(e);
  }

  public Optional toOrderByInfo() {
    Optional res = Optional.absent();

    if (!orderList.isEmpty()) {
      OrderByInfo info = OrderByInfo.builder()
          .orderList(orderList)
          .build();
      res = Optional.of(info);
    }

    return res;
  }

}