src/java/org/mxchange/jcountry/data/AddressbookCountrySingletonBean.java

   1 /*
   2  * Copyright (C) 2016 Roland Haeder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU Affero General Public License as
   6  * published by the Free Software Foundation, either version 3 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU Affero General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Affero General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17 package org.mxchange.jcountry.data;
  18
  19 import java.text.MessageFormat;
  20 import java.util.GregorianCalendar;
  21 import java.util.List;
  22 import javax.ejb.Singleton;
  23 import javax.ejb.Startup;
  24 import javax.persistence.NoResultException;
  25 import javax.persistence.Query;
  26 import org.mxchange.jcoreee.database.BaseDatabaseBean;
  27 import org.mxchange.jcountry.exceptions.CountryAlreadyAddedException;
  28
  29 /**
  30  * A singleton bean for country informations
  31  * <p>
  32  * @author Roland Haeder<roland@mxchange.org>
  33  */
  34 @Startup
  35 @Singleton (name = "country", mappedName = "ejb/addressbook-singleton-country", description = "A singleton session bean for country informations")
  36 public class AddressbookCountrySingletonBean extends BaseDatabaseBean implements CountrySingletonBeanRemote {
  37
  38         /**
  39          * Serial number
  40          */
  41         private static final long serialVersionUID = 15_846_983_298_691_207L;
  42
  43         @Override
  44         public Country addCountry (final Country country) throws CountryAlreadyAddedException {
  45                 // Is it already there?
  46                 if (null == country) {
  47                         // Throw NPE
  48                         throw new NullPointerException("country is null"); //NOI18N
  49                 } else if (country.getCountryCode().isEmpty()) {
  50                         // Code is not set
  51                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
  52                 } else if (country.getCountryI18nkey().isEmpty()) {
  53                         // I18n key is not set
  54                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
  55                 } else if (country.getCountryId() != null) {
  56                         // Should be null
  57                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
  58                 } else if (this.isCountryAdded(country)) {
  59                         // Yes, then abort here
  60                         throw new CountryAlreadyAddedException(country);
  61                 }
  62
  63                 // Add timestamp
  64                 country.setCountryEntryCreated(new GregorianCalendar());
  65
  66                 // It is not added, so persist it
  67                 this.getEntityManager().persist(country);
  68
  69                 // Flush it to get id number back, maybe it is directly needed?
  70                 this.getEntityManager().flush();
  71
  72                 // Return updated instance
  73                 return country;
  74         }
  75
  76         @Override
  77         @SuppressWarnings ("unchecked")
  78         public List<Country> allCountries () {
  79                 // Init query
  80                 Query query = this.getEntityManager().createNamedQuery("AllCountries", List.class); //NOI18N
  81
  82                 // Return it
  83                 return query.getResultList();
  84         }
  85
  86         /**
  87          * Checks whether given country is already added by i18n key or country
  88          * code, what comes first.
  89          * <p>
  90          * @param country Country instance to check
  91          * <p>
  92          * @return Whether the country was found
  93          */
  94         private boolean isCountryAdded (final Country country) {
  95                 if (null == country) {
  96                         // Throw NPE
  97                         throw new NullPointerException("country is null"); //NOI18N
  98                 } else if (country.getCountryCode().isEmpty()) {
  99                         // Code is not set
 100                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
 101                 } else if (country.getCountryI18nkey().isEmpty()) {
 102                         // I18n key is not set
 103                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
 104                 } else if (country.getCountryId() != null) {
 105                         // Should be null
 106                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
 107                 }
 108
 109                 // Default is not found
 110                 boolean isAdded = false;
 111
 112                 // Get query instance
 113                 Query query = this.getEntityManager().createNamedQuery("SearchCountryByCodeI18nKey", CountryData.class); //NOI18N
 114
 115                 // Assign all parameters
 116                 query.setParameter("code", country.getCountryCode()); //NOI18N
 117                 query.setParameter("key", country.getCountryI18nkey()); //NOI18N
 118
 119                 // Try to get a single result
 120                 try {
 121                         // Get single result
 122                         Country foundCountry = (Country) query.getSingleResult();
 123
 124                         // Found it?
 125                         isAdded = (foundCountry instanceof Country);
 126                 } catch (final NoResultException ex) {
 127                         // Not found, don't log this
 128                 }
 129
 130                 // Return result
 131                 return isAdded;
 132         }
 133
 134 }