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

   1 /*
   2  * Copyright (C) 2016, 2017 Roland Häder
   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.addressbook.database.BaseAddressbookDatabaseBean;
  27 import org.mxchange.jcountry.exceptions.CountryAlreadyAddedException;
  28
  29 /**
  30  * A singleton EJB for country informations
  31  * <p>
  32  * @author Roland Häder<roland@mxchange.org>
  33  */
  34 @Startup
  35 @Singleton (name = "country", description = "A singleton session-scoped bean for country informations")
  36 public class AddressbookCountrySingletonBean extends BaseAddressbookDatabaseBean implements CountrySingletonBeanRemote {
  37
  38         /**
  39          * Serial number
  40          */
  41         private static final long serialVersionUID = 15_846_983_298_691_207L;
  42
  43         /**
  44          * Default constructor
  45          */
  46         public AddressbookCountrySingletonBean () {
  47                 // Call super constructor
  48                 super();
  49         }
  50
  51         @Override
  52         public Country addCountry (final Country country) throws CountryAlreadyAddedException {
  53                 // Trace message
  54                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.addCountry: country={1} - CALLED!", this.getClass().getSimpleName(), country)); //NOI18N
  55
  56                 // Is it already there?
  57                 if (null == country) {
  58                         // Throw NPE
  59                         throw new NullPointerException("country is null"); //NOI18N
  60                 } else if (country.getCountryCode().isEmpty()) {
  61                         // Code is not set
  62                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
  63                 } else if (country.getCountryI18nKey().isEmpty()) {
  64                         // I18n key is not set
  65                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
  66                 } else if (country.getCountryId() != null) {
  67                         // Should be null
  68                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
  69                 } else if (this.isCountryAdded(country)) {
  70                         // Yes, then abort here
  71                         throw new CountryAlreadyAddedException(country);
  72                 }
  73
  74                 // Add timestamp
  75                 country.setCountryEntryCreated(new GregorianCalendar());
  76
  77                 // It is not added, so persist it
  78                 this.getEntityManager().persist(country);
  79
  80                 // Flush it to get id number back, maybe it is directly needed?
  81                 this.getEntityManager().flush();
  82
  83                 // Trace message
  84                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.addCountry: country={1} - EXIT!", this.getClass().getSimpleName(), country)); //NOI18N
  85
  86                 // Return updated instance
  87                 return country;
  88         }
  89
  90         @Override
  91         @SuppressWarnings ("unchecked")
  92         public List<Country> allCountries () {
  93                 // Trace message
  94                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.allCountries: CALLED!", this.getClass().getSimpleName())); //NOI18N
  95
  96                 // Init query
  97                 Query query = this.getEntityManager().createNamedQuery("AllCountries", CountryData.class); //NOI18N
  98
  99                 // Get list
 100                 List<Country> countries = query.getResultList();
 101
 102                 // Trace message
 103                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.allCountries: countries.size()={1} - EXIT!", this.getClass().getSimpleName(), countries.size())); //NOI18N
 104
 105                 // Return it
 106                 return countries;
 107         }
 108
 109         /**
 110          * Checks whether given country is already added by i18n key or country
 111          * code, what comes first.
 112          * <p>
 113          * @param country Country instance to check
 114          * <p>
 115          * @return Whether the country was found
 116          */
 117         private boolean isCountryAdded (final Country country) {
 118                 if (null == country) {
 119                         // Throw NPE
 120                         throw new NullPointerException("country is null"); //NOI18N
 121                 } else if (country.getCountryCode().isEmpty()) {
 122                         // Code is not set
 123                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
 124                 } else if (country.getCountryI18nKey().isEmpty()) {
 125                         // I18n key is not set
 126                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
 127                 } else if (country.getCountryId() != null) {
 128                         // Should be null
 129                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
 130                 }
 131
 132                 // Default is not found
 133                 boolean isAdded = false;
 134
 135                 // Get query instance
 136                 Query query = this.getEntityManager().createNamedQuery("SearchCountryByCodeI18nKey", CountryData.class); //NOI18N
 137
 138                 // Assign all parameters
 139                 query.setParameter("code", country.getCountryCode()); //NOI18N
 140                 query.setParameter("key", country.getCountryI18nKey()); //NOI18N
 141
 142                 // Try to get a single result
 143                 try {
 144                         // Get single result
 145                         Country foundCountry = (Country) query.getSingleResult();
 146
 147                         // Found it?
 148                         isAdded = (foundCountry instanceof Country);
 149                 } catch (final NoResultException ex) {
 150                         // Not found, don't log this
 151                 }
 152
 153                 // Return result
 154                 return isAdded;
 155         }
 156
 157 }