content: /*
   *  Copyright (C) 2010-2012 Stichting Akvo (Akvo Foundation)
   *
   *  This file is part of Akvo FLOW.
   *
   *  Akvo FLOW is free software: you can redistribute it and modify it under the terms of
   *  the GNU Affero General Public License (AGPL) as published by the Free Software Foundation,
   *  either version 3 of the License or any later version.
   *
   *  Akvo FLOW 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 Affero General Public License included below for more details.
   *
   *  The full license text can also be seen at <http://www.gnu.org/licenses/agpl.html>.
   */
  
  package com.gallatinsystems.task.helper;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import com.gallatinsystems.gis.coordinate.utilities.CoordinateUtilities;
  import com.gallatinsystems.task.dao.TaskDao;
  import com.gallatinsystems.task.domain.Task;
  import com.gallatinsystems.task.domain.Task.TaskStatus;
  
  /**
   * helper class for the task domain. It can use geo distance computations to filter task results by
   * distances.
   * 
   * @author Christopher Fagiani
   */
  public class TaskHelper {
      private TaskDao taskDao;
  
      public TaskHelper() {
          taskDao = new TaskDao();
      }
  
      /**
       * lists all tasks for a country with an Incomplete status that are less than maxDistance miles
       * from the point passed in
       * 
       * @param countryCode
       * @param lat
       * @param lon
       * @param cursorString
       * @return
       */
      public List<Task> listNearbyIncompleteTasks(String countryCode, Double lat,
              Double lon, String cursorString) {
          List<Task> countryTasks = taskDao.listTasksByCountry(countryCode,
                  TaskStatus.INCOMPLETE, cursorString);
          List<Task> closeTasks = new ArrayList<Task>();
          // now that we have the tasks for this country, filter by distance
          if (countryTasks != null) {
              for (Task task : countryTasks) {
                  if (CoordinateUtilities.computeDistanceInMiles(lat, lon, task
                          .getLat(), task.getLon()) <= task.getMaxDistance()) {
                      closeTasks.add(task);
                  }
              }
          }
          return closeTasks;
      }
  }
  