content: /*
   * Copyright (C) 2012-2023 52°North Spatial Information Research GmbH
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published
   * by the Free Software Foundation.
   *
   * If the program is linked with libraries which are licensed under one of
   * the following licenses, the combination of the program with the linked
   * library is not considered a "derivative work" of the program:
   *
   *     - Apache License, version 2.0
   *     - Apache Software License, version 1.0
   *     - GNU Lesser General Public License, version 3
   *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
   *     - Common Development and Distribution License (CDDL), version 1.0
   *
   * Therefore the distribution of the program linked with libraries licensed
   * under the aforementioned licenses, is permitted by the copyright holders
   * if the distribution is compliant with both the GNU General Public
   * License version 2 and the aforementioned licenses.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
   * Public License for more details.
   */
  package org.n52.sos.ds.hibernate.dao;
  
  import java.sql.Timestamp;
  
  import org.hibernate.Criteria;
  import org.hibernate.criterion.Projections;
  import org.joda.time.DateTime;
  import org.joda.time.DateTimeZone;
  import org.n52.shetland.ogc.gml.time.TimePeriod;
  
  /**
   * Abstract class to create a time period object
   *
   * @author CarstenHollmann
   * @since 4.0.0
   */
  public abstract class TimeCreator {
  
      protected enum MinMax {
          MIN,
          MAX
      }
  
      /**
       * Creates a time period object from sources
       *
       * @param minStart Min start timestamp
       * @param maxStart Max start timestamp
       * @param maxEnd Max end timestamp
       *
       * @return Time period object
       */
      public TimePeriod createTimePeriod(Timestamp minStart, Timestamp maxStart, Timestamp maxEnd) {
          DateTime start = new DateTime(minStart, DateTimeZone.UTC);
          DateTime end = new DateTime(maxStart, DateTimeZone.UTC);
          if (maxEnd != null) {
              DateTime endTmp = new DateTime(maxEnd, DateTimeZone.UTC);
              if (endTmp.isAfter(end)) {
                  end = endTmp;
              }
          }
          return new TimePeriod(start, end);
      }
  
      /**
       * Add min/max projection to criteria
       *
       * @param criteria Hibernate Criteria to add projection
       * @param minMax Min/Max identifier
       * @param property Property to apply projection to
       */
      public void addMinMaxProjection(Criteria criteria, MinMax minMax, String property) {
          // TODO move this to a better location, maybe with Java 8 in an own Interface with Multiple Inheritance
          switch (minMax) {
              case MIN:
                  criteria.setProjection(Projections.min(property));
                  break;
              case MAX:
                  criteria.setProjection(Projections.max(property));
                  break;
              default:
                  throw new Error();
          }
      }
  }
  