src/java/org/mxchange/jcountry/data/PizzaCountrySingletonBean.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 de.chotime.jratecalc.database.BasePizzaDatabaseBean;
  20 import java.text.MessageFormat;
  21 import java.util.GregorianCalendar;
  22 import java.util.List;
  23 import javax.ejb.Singleton;
  24 import javax.ejb.Startup;
  25 import javax.persistence.NoResultException;
  26 import javax.persistence.Query;
  27 import org.mxchange.jcountry.exceptions.CountryAlreadyAddedException;
  28 import org.mxchange.pizzaaplication.database.BasePizzaDatabaseBean;
  29
  30 /**
  31  * A singleton EJB for country informations
  32  * <p>
  33  * @author Roland Haeder<roland@mxchange.org>
  34  */
  35 @Startup
  36 @Singleton (name = "country", mappedName = "ejb/pizzaservice-singleton-country", description = "A singleton session bean for country informations")
  37 public class PizzaCountrySingletonBean extends BasePizzaDatabaseBean implements CountrySingletonBeanRemote {
  38
  39         /**
  40          * Serial number
  41          */
  42         private static final long serialVersionUID = 15_846_983_298_691_207L;
  43
  44         @Override
  45         public Country addCountry (final Country country) throws CountryAlreadyAddedException {
  46                 // Is it already there?
  47                 if (null == country) {
  48                         // Throw NPE
  49                         throw new NullPointerException("country is null"); //NOI18N
  50                 } else if (country.getCountryCode().isEmpty()) {
  51                         // Code is not set
  52                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
  53                 } else if (country.getCountryI18nkey().isEmpty()) {
  54                         // I18n key is not set
  55                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
  56                 } else if (country.getCountryId() != null) {
  57                         // Should be null
  58                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
  59                 } else if (this.isCountryAdded(country)) {
  60                         // Yes, then abort here
  61                         throw new CountryAlreadyAddedException(country);
  62                 }
  63
  64                 // Add timestamp
  65                 country.setCountryEntryCreated(new GregorianCalendar());
  66
  67                 // It is not added, so persist it
  68                 this.getEntityManager().persist(country);
  69
  70                 // Flush it to get id number back, maybe it is directly needed?
  71                 this.getEntityManager().flush();
  72
  73                 // Return updated instance
  74                 return country;
  75         }
  76
  77         @Override
  78         @SuppressWarnings ("unchecked")
  79         public List<Country> allCountries () {
  80                 // Init query
  81                 Query query = this.getEntityManager().createNamedQuery("AllCountries", List.class); //NOI18N
  82
  83                 // Return it
  84                 return query.getResultList();
  85         }
  86
  87         /**
  88          * Checks whether given country is already added by i18n key or country
  89          * code, what comes first.
  90          * <p>
  91          * @param country Country instance to check
  92          * <p>
  93          * @return Whether the country was found
  94          */
  95         private boolean isCountryAdded (final Country country) {
  96                 if (null == country) {
  97                         // Throw NPE
  98                         throw new NullPointerException("country is null"); //NOI18N
  99                 } else if (country.getCountryCode().isEmpty()) {
 100                         // Code is not set
 101                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
 102                 } else if (country.getCountryI18nkey().isEmpty()) {
 103                         // I18n key is not set
 104                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
 105                 } else if (country.getCountryId() != null) {
 106                         // Should be null
 107                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
 108                 }
 109
 110                 // Default is not found
 111                 boolean isAdded = false;
 112
 113                 // Get query instance
 114                 Query query = this.getEntityManager().createNamedQuery("SearchCountryByCodeI18nKey", Country.class); //NOI18N
 115
 116                 // Assign all parameters
 117                 query.setParameter("code", country.getCountryCode()); //NOI18N
 118                 query.setParameter("key", country.getCountryI18nkey()); //NOI18N
 119
 120                 // Try to get a single result
 121                 try {
 122                         // Get single result
 123                         Country foundCountry = (Country) query.getSingleResult();
 124
 125                         // Found it?
 126                         isAdded = (foundCountry instanceof Country);
 127                 } catch (final NoResultException ex) {
 128                         // Not found, don't log this
 129                 }
 130
 131                 // Return result
 132                 return isAdded;
 133         }
 134
 135 }