src/java/org/mxchange/addressbook/model/shared/SharedAddressbooksSessionBean.java

   1 /*
   2  * Copyright (C) 2015 Roland Haeder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (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 General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.addressbook.model.shared;
  18
  19 import java.text.MessageFormat;
  20 import java.util.List;
  21 import javax.ejb.Stateless;
  22 import javax.persistence.NoResultException;
  23 import javax.persistence.Query;
  24 import org.mxchange.addressbook.model.addressbook.shared.AddressbookShare;
  25 import org.mxchange.addressbook.model.addressbook.shared.ShareableAddressbook;
  26 import org.mxchange.jcoreee.database.BaseDatabaseBean;
  27 import org.mxchange.jusercore.model.user.User;
  28
  29 /**
  30  * A stateless bean for handling address book sharing
  31  * <p>
  32  * @author Roland Haeder
  33  */
  34 @Stateless (name = "share", mappedName = "ejb/stateless-share", description = "A stateless bean for handling shared addressbooks")
  35 public class SharedAddressbooksSessionBean extends BaseDatabaseBean implements SharedAddressbooksSessionBeanRemote {
  36
  37         /**
  38          * Serial number
  39          */
  40         private static final long serialVersionUID = 136_984_697_285_694_710L;
  41
  42         /**
  43          * Shared address books. If you add another share to the database, please
  44          * also update this list as some methods may prefer this over asking the JPA
  45          * all over again.
  46          */
  47         private List<ShareableAddressbook> shares;
  48
  49         /**
  50          * Default constructor
  51          */
  52         public SharedAddressbooksSessionBean () {
  53                 // Init shares list
  54                 this.shares = null;
  55         }
  56
  57         @Override
  58         @SuppressWarnings ("unchecked")
  59         public boolean isUserSharingAddressbooks (final User user) {
  60                 // Trace message
  61                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserSharingAddressbooks: user={0} - CALLED!", user)); //NOI18N
  62
  63                 // Is user null?
  64                 if (null == user) {
  65                         // Throw NPE
  66                         throw new NullPointerException("user is null"); //NOI18N
  67                 } else if (user.getUserId() == null) {
  68                         // Null userId is not allowed
  69                         throw new NullPointerException("user.userId is null"); //NOI18N
  70                 } else if (user.getUserId() < 1) {
  71                         // Not allowed value
  72                         throw new IllegalArgumentException(MessageFormat.format("user.UserId={0} is an invalid value", user.getUserId())); //NOI18N
  73                 } else if (this.shares instanceof List) {
  74                         // Trace message
  75                         this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserSharingAddressbooks: this.shares.isEmpty()={0} - EXIT!", this.shares.isEmpty()));
  76
  77                         // Is already initialized
  78                         return (!this.shares.isEmpty());
  79                 }
  80
  81                 // Get named query
  82                 Query query = this.getEntityManager().createNamedQuery("SearchUserSharedAddressbooks", AddressbookShare.class); //NOI18N
  83
  84                 // Set parameter
  85                 query.setParameter("user", user); //NOI18N
  86
  87                 // Default is not sharing
  88                 boolean isSharing = false;
  89
  90                 // Try it as an exception may be thrown
  91                 try {
  92                         // Get results
  93                         this.shares = query.getResultList();
  94
  95                         // Debug message
  96                         this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserSharingAddressbooks: shares.size()={0}", this.shares.size()));
  97
  98                         // Is it not empty?
  99                         isSharing = (!this.shares.isEmpty());
 100                 } catch (final NoResultException ex) {
 101                         // Not sharing anything
 102                         this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserSharingAddressbooks: User {0} is not sharing address books: {1}", user, ex)); //NOI18N
 103                 }
 104
 105                 // Trace message
 106                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserSharingAddressbooks: iSharing={0} - EXIT!", isSharing)); //NOI18N
 107
 108                 // Return it
 109                 return isSharing;
 110         }
 111 }