src/java/org/mxchange/jcountry/model/data/JobsAdminCountrySingletonBean.java

   1 /*
   2  * Copyright (C) 2016 - 2018 Free Software Foundation
   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.model.data;
  18
  19 import java.text.MessageFormat;
  20 import java.util.Date;
  21 import javax.ejb.Stateless;
  22 import javax.persistence.NoResultException;
  23 import javax.persistence.Query;
  24 import org.mxchange.jcountry.exceptions.CountryAlreadyAddedException;
  25 import org.mxchange.jjobs.beans.ejb.BaseJobsEnterpriseBean;
  26
  27 /**
  28  * A stateless EJB for administrative country purposes
  29  * <p>
  30  * @author Roland Häder<roland@mxchange.org>
  31  */
  32 @Stateless (name = "adminCountry", description = "A stateless session-scoped bean for administrative country purposes")
  33 public class JobsAdminCountrySingletonBean extends BaseJobsEnterpriseBean implements AdminCountrySessionBeanRemote {
  34
  35         /**
  36          * Serial number
  37          */
  38         private static final long serialVersionUID = 15_846_983_298_691_208L;
  39
  40         /**
  41          * Default constructor
  42          */
  43         public JobsAdminCountrySingletonBean () {
  44                 // Call super constructor
  45                 super();
  46         }
  47
  48         @Override
  49         public Country addCountry (final Country country) throws CountryAlreadyAddedException {
  50                 // Trace message
  51                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.addCountry: country={1} - CALLED!", this.getClass().getSimpleName(), country)); //NOI18N
  52
  53                 // Is it already there?
  54                 if (null == country) {
  55                         // Throw NPE
  56                         throw new NullPointerException("country is null"); //NOI18N
  57                 } else if (country.getCountryCode().isEmpty()) {
  58                         // Code is not set
  59                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
  60                 } else if (country.getCountryI18nKey().isEmpty()) {
  61                         // I18n key is not set
  62                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
  63                 } else if (country.getCountryId() != null) {
  64                         // Should be null
  65                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
  66                 } else if (this.isCountryAdded(country)) {
  67                         // Yes, then abort here
  68                         throw new CountryAlreadyAddedException(country);
  69                 }
  70
  71                 // Add timestamp
  72                 country.setCountryEntryCreated(new Date());
  73
  74                 // It is not added, so persist it
  75                 this.getEntityManager().persist(country);
  76
  77                 // Trace message
  78                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.addCountry: country={1} - EXIT!", this.getClass().getSimpleName(), country)); //NOI18N
  79
  80                 // Return updated instance
  81                 return country;
  82         }
  83
  84         /**
  85          * Checks whether given country is already added by i18n key or country
  86          * code, what comes first.
  87          * <p>
  88          * @param country Country instance to check
  89          * <p>
  90          * @return Whether the country was found
  91          */
  92         private boolean isCountryAdded (final Country country) {
  93                 if (null == country) {
  94                         // Throw NPE
  95                         throw new NullPointerException("country is null"); //NOI18N
  96                 } else if (country.getCountryCode().isEmpty()) {
  97                         // Code is not set
  98                         throw new IllegalArgumentException("country.countryCode is empty"); //NOI18N
  99                 } else if (country.getCountryI18nKey().isEmpty()) {
 100                         // I18n key is not set
 101                         throw new IllegalArgumentException("country.countryI18nKey is empty"); //NOI18N
 102                 } else if (country.getCountryId() != null) {
 103                         // Should be null
 104                         throw new IllegalArgumentException(MessageFormat.format("country.countryId is not null ({0})", country.getCountryId())); //NOI18N
 105                 }
 106
 107                 // Default is not found
 108                 boolean isAdded = false;
 109
 110                 // Get query instance
 111                 final Query query = this.getEntityManager().createNamedQuery("SearchCountryByCodeI18nKey", CountryData.class); //NOI18N
 112
 113                 // Assign all parameters
 114                 query.setParameter("code", country.getCountryCode()); //NOI18N
 115                 query.setParameter("key", country.getCountryI18nKey()); //NOI18N
 116
 117                 // Try to get a single result
 118                 try {
 119                         // Get single result
 120                         final Country foundCountry = (Country) query.getSingleResult();
 121
 122                         // Found it?
 123                         isAdded = (foundCountry instanceof Country);
 124                 } catch (final NoResultException ex) {
 125                         // Not found, don't log this
 126                 }
 127
 128                 // Return result
 129                 return isAdded;
 130         }
 131
 132 }