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 java.util.Objects;
  22 import javax.ejb.Stateless;
  23 import javax.persistence.NoResultException;
  24 import javax.persistence.Query;
  25 import org.mxchange.addressbook.exceptions.UserAlreadySharingAddressbookException;
  26 import org.mxchange.addressbook.model.addressbook.Addressbook;
  27 import org.mxchange.addressbook.model.addressbook.shared.AddressbookShare;
  28 import org.mxchange.addressbook.model.addressbook.shared.ShareableAddressbook;
  29 import org.mxchange.jcoreee.database.BaseDatabaseBean;
  30 import org.mxchange.jusercore.model.user.User;
  31
  32 /**
  33  * A stateless bean for handling address book sharing
  34  * <p>
  35  * @author Roland Haeder
  36  */
  37 @Stateless (name = "share", mappedName = "ejb/stateless-share", description = "A stateless bean for handling shared addressbooks")
  38 public class SharedAddressbooksSessionBean extends BaseDatabaseBean implements SharedAddressbooksSessionBeanRemote {
  39
  40         /**
  41          * Serial number
  42          */
  43         private static final long serialVersionUID = 136_984_697_285_694_710L;
  44
  45         /**
  46          * Shared address books
  47          */
  48         private List<ShareableAddressbook> shares;
  49
  50         /**
  51          * Default constructor
  52          */
  53         public SharedAddressbooksSessionBean () {
  54                 // Init shares list
  55                 this.shares = null;
  56         }
  57
  58         @Override
  59         @SuppressWarnings ("unchecked")
  60         public Boolean isUserSharingAddressbooks (final User user) {
  61                 // Trace message
  62                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserSharingAddressbooks: user={0} - CALLED!", user)); //NOI18N
  63
  64                 // Is user null?
  65                 if (null == user) {
  66                         // Throw NPE
  67                         throw new NullPointerException("user is null"); //NOI18N
  68                 } else if (user.getUserId() == null) {
  69                         // Null userId is not allowed
  70                         throw new NullPointerException("user.userId is null"); //NOI18N
  71                 } else if (user.getUserId() < 1) {
  72                         // Not allowed value
  73                         throw new IllegalArgumentException(MessageFormat.format("user.UserId={0} is an invalid value", user.getUserId())); //NOI18N
  74                 }
  75
  76                 // Get named query
  77                 Query query = this.getEntityManager().createNamedQuery("SearchUserSharedAddressbooks", AddressbookShare.class); //NOI18N
  78
  79                 // Set parameter
  80                 query.setParameter("user", user); //NOI18N
  81
  82                 // Default is not sharing
  83                 Boolean isSharing = Boolean.FALSE;
  84
  85                 // Try it as an exception may be thrown
  86                 try {
  87                         // Get results
  88                         this.shares = query.getResultList();
  89
  90                         // Debug message
  91                         this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserSharingAddressbooks: shares.size()={0}", this.shares.size())); //NOI18N
  92
  93                         // Is it not empty?
  94                         isSharing = (!this.shares.isEmpty());
  95                 } catch (final NoResultException ex) {
  96                         // Not sharing anything
  97                         this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserSharingAddressbooks: User {0} is not sharing address books: {1}", user, ex)); //NOI18N
  98                 }
  99
 100                 // Trace message
 101                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserSharingAddressbooks: iSharing={0} - EXIT!", isSharing)); //NOI18N
 102
 103                 // Return it
 104                 return isSharing;
 105         }
 106
 107         @Override
 108         public ShareableAddressbook startSharing (final User sharee, final Addressbook addressbook) throws UserAlreadySharingAddressbookException {
 109                 // Trace message
 110                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("startSharing: sharee={0},addressbook={1} - CALLED!", sharee, addressbook)); //NOI18N
 111
 112                 // Check all conditions
 113                 if (null == sharee) {
 114                         // Throw NPE
 115                         throw new NullPointerException("sharee is null"); //NOI18N
 116                 } else if (sharee.getUserId() == null) {
 117                         // Throw NPE again
 118                         throw new NullPointerException("sharee.userId is null"); //NOI18N
 119                 } else if (sharee.getUserId() < 1) {
 120                         // Invalid id number
 121                         throw new IllegalStateException(MessageFormat.format("sharee.userId={0} is invalid", sharee.getUserId())); //NOI18N
 122                 } else if (null == addressbook) {
 123                         // Throw NPE again
 124                         throw new NullPointerException("addressbook is null"); //NOI18N
 125                 } else if (addressbook.getAddressbookId() == null) {
 126                         // Throw NPE again
 127                         throw new NullPointerException("addressbook.addressbookId is null"); //NOI18N
 128                 } else if (addressbook.getAddressbookId() < 1) {
 129                         // Invalid id number
 130                         throw new IllegalArgumentException(MessageFormat.format("addressbook.addressbookId={0} is invalid.", addressbook.getAddressbookId())); //NOI18N
 131                 } else if (Objects.equals(addressbook.getAddressbookUser(), sharee)) {
 132                         // Sharing with yourself!
 133                         throw new IllegalStateException("User tries to share with himself."); //NOI18N
 134                 }
 135
 136                 // Is the entry already there?
 137                 if (this.isUserAlreadySharingAddressbook(addressbook, sharee)) {
 138                         // Abort here
 139                         throw new UserAlreadySharingAddressbookException(addressbook, sharee);
 140                 }
 141
 142                 // All fine so far, then create the instance
 143                 ShareableAddressbook share = new AddressbookShare(addressbook, sharee);
 144
 145                 // Debug message
 146                 this.getLoggerBeanLocal().logDebug(MessageFormat.format("startSharing: share={0}", share));
 147
 148                 // Persist it
 149                 this.getEntityManager().persist(share);
 150
 151                 // Flush to get id number
 152                 this.getEntityManager().flush();
 153
 154                 // Return updated instance
 155                 return share;
 156         }
 157
 158         /**
 159          * Checks whether the owner of the given address book is already sharing it
 160          * with the sharee.
 161          * <p>
 162          * @param addressbook Address book to be shared with
 163          * @param sharee User sharee instance
 164          * @return Wether the address book is already shared with the sharee
 165          */
 166         private boolean isUserAlreadySharingAddressbook (final Addressbook addressbook, final User sharee) {
 167                 // Trace message
 168                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserAlreadySharingAddressbook: addressbook={0},sharee={1} - CALLED!", addressbook, sharee)); //NOI18N
 169
 170                 // Get named query
 171                 Query query = this.getEntityManager().createNamedQuery("SearchShareeAddressbookShare", AddressbookShare.class); //NOI18N
 172
 173                 // Set parameter
 174                 query.setParameter("addressbook", addressbook); //NOI18N
 175                 query.setParameter("sharee", sharee); //NOI18N
 176
 177                 // Default is not found
 178                 boolean isFound = false;
 179
 180                 // Try it
 181                 try {
 182                         // Get single instance
 183                         ShareableAddressbook share = (ShareableAddressbook) query.getSingleResult();
 184
 185                         // Debug message
 186                         this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserAlreadySharingAddressbook: share={0} - FOUND!", share)); //NOI18N
 187
 188                         // Set found
 189                         isFound = true;
 190                 } catch (final NoResultException ex) {
 191                         // Not found, log exception
 192                         this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserAlreadySharingAddressbook: Notfound. Exception: {0}", ex)); //NOI18N
 193                 }
 194
 195                 // Trace message
 196                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserAlreadySharingAddressbook: isFound={0} - EXIT!", isFound)); //NOI18N
 197
 198                 // Return it
 199                 return isFound;
 200         }
 201 }