content: /*
   *  Copyright (C) 2014 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 org.akvo.gae.remoteapi;
  
  import com.google.appengine.api.datastore.DatastoreService;
  import com.google.appengine.api.datastore.DatastoreServiceFactory;
  import com.google.appengine.api.datastore.Entity;
  import com.google.appengine.api.datastore.FetchOptions;
  import com.google.appengine.api.datastore.PreparedQuery;
  import com.google.appengine.api.datastore.Query;
  import com.google.appengine.api.datastore.Query.Filter;
  import com.google.appengine.api.datastore.Query.FilterOperator;
  import com.google.appengine.api.datastore.Query.FilterPredicate;
  import com.google.appengine.tools.remoteapi.RemoteApiInstaller;
  import com.google.appengine.tools.remoteapi.RemoteApiOptions;
  
  public class DeleteSurveyInstances {
  
      public static void main(String[] args) {
  
          final String usr = args[0];
          final String pwd = args[1];
          final Long surveyId = Long.parseLong(args[2]);
  
          final RemoteApiOptions options = new RemoteApiOptions().server(
                  "instance.appspot.com", 443)
                  .credentials(usr, pwd);
          final RemoteApiInstaller installer = new RemoteApiInstaller();
  
          try {
  
              installer.install(options);
              final DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
  
              final Filter f = new FilterPredicate("surveyId", FilterOperator.EQUAL, surveyId);
              final Query q = new Query("SurveyInstance").setFilter(f).setKeysOnly();
              final PreparedQuery pq = ds.prepare(q);
              for (final Entity e : pq.asIterable(FetchOptions.Builder.withChunkSize(100))) {
                  final Filter qasF = new FilterPredicate("surveyInstanceId", FilterOperator.EQUAL, e
                          .getKey().getId());
                  final Query qasQ = new Query("QuestionAnswerStore").setFilter(qasF).setKeysOnly();
                  if (ds.prepare(qasQ).asList(FetchOptions.Builder.withDefaults()).size() == 0) {
                      ds.delete(e.getKey());
                      System.out.println("Deleted " + e.getKey().getId());
                  }
              }
              System.out.println("Done");
          } catch (Exception e) {
              e.printStackTrace();
          } finally {
              installer.uninstall();
          }
      }
  }
  