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

   1 /*
   2  * Copyright (C) 2016 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.jcoreee.database.BaseDatabaseBean;
  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 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                 // Trace message
  46                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.addCountry: country={1} - CALLED!", this.getClass().getSimpleName(), country)); //NOI18N
  47
  48                 // Is it already there?
  49                 if (null == country) {
  50                         // Throw NPE
  51                         throw new NullPointerException("country is null"); //NOI18N
  52                 } else if (country.getCountryCode().isEmpty()) {
  53                         // Code is not set
  54                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
  55                 } else if (country.getCountryI18nKey().isEmpty()) {
  56                         // I18n key is not set
  57                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
  58                 } else if (country.getCountryId() != null) {
  59                         // Should be null
  60                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
  61                 } else if (this.isCountryAdded(country)) {
  62                         // Yes, then abort here
  63                         throw new CountryAlreadyAddedException(country);
  64                 }
  65
  66                 // Add timestamp
  67                 country.setCountryEntryCreated(new GregorianCalendar());
  68
  69                 // It is not added, so persist it
  70                 this.getEntityManager().persist(country);
  71
  72                 // Flush it to get id number back, maybe it is directly needed?
  73                 this.getEntityManager().flush();
  74
  75                 // Trace message
  76                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.addCountry: country={1} - EXIT!", this.getClass().getSimpleName(), country)); //NOI18N
  77
  78                 // Return updated instance
  79                 return country;
  80         }
  81
  82         @Override
  83         @SuppressWarnings ("unchecked")
  84         public List<Country> allCountries () {
  85                 // Trace message
  86                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.allCountries: CALLED!", this.getClass().getSimpleName())); //NOI18N
  87
  88                 // Init query
  89                 Query query = this.getEntityManager().createNamedQuery("AllCountries", CountryData.class); //NOI18N
  90
  91                 // Get list
  92                 List<Country> countries = query.getResultList();
  93
  94                 // Trace message
  95                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.allCountries: countries.size()={1} - EXIT!", this.getClass().getSimpleName(), countries.size())); //NOI18N
  96
  97                 // Return it
  98                 return countries;
  99         }
 100
 101         /**
 102          * Checks whether given country is already added by i18n key or country
 103          * code, what comes first.
 104          * <p>
 105          * @param country Country instance to check
 106          * <p>
 107          * @return Whether the country was found
 108          */
 109         private boolean isCountryAdded (final Country country) {
 110                 if (null == country) {
 111                         // Throw NPE
 112                         throw new NullPointerException("country is null"); //NOI18N
 113                 } else if (country.getCountryCode().isEmpty()) {
 114                         // Code is not set
 115                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
 116                 } else if (country.getCountryI18nKey().isEmpty()) {
 117                         // I18n key is not set
 118                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
 119                 } else if (country.getCountryId() != null) {
 120                         // Should be null
 121                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
 122                 }
 123
 124                 // Default is not found
 125                 boolean isAdded = false;
 126
 127                 // Get query instance
 128                 Query query = this.getEntityManager().createNamedQuery("SearchCountryByCodeI18nKey", CountryData.class); //NOI18N
 129
 130                 // Assign all parameters
 131                 query.setParameter("code", country.getCountryCode()); //NOI18N
 132                 query.setParameter("key", country.getCountryI18nKey()); //NOI18N
 133
 134                 // Try to get a single result
 135                 try {
 136                         // Get single result
 137                         Country foundCountry = (Country) query.getSingleResult();
 138
 139                         // Found it?
 140                         isAdded = (foundCountry instanceof Country);
 141                 } catch (final NoResultException ex) {
 142                         // Not found, don't log this
 143                 }
 144
 145                 // Return result
 146                 return isAdded;
 147         }
 148
 149 }