Continued:

- implemented business method startSharing()
- added private method isUserAlreadySharingAddressbook() to check if the address book's owner is already sharing it with the sharee
Signed-off-by:Roland Häder <roland@mxchange.org>

diff --git a/src/java/org/mxchange/addressbook/model/shared/SharedAddressbooksSessionBean.java b/src/java/org/mxchange/addressbook/model/shared/SharedAddressbooksSessionBean.java
index 8407f00cc4231fabb9d7229a5523f315d444c330..b276bbbc3729bbbc02f69b6e7a8455ab8629f55c 100644 (file)
--- a/src/java/org/mxchange/addressbook/model/shared/SharedAddressbooksSessionBean.java
+++ b/src/java/org/mxchange/addressbook/model/shared/SharedAddressbooksSessionBean.java
@@ -18,9 +18,12 @@ package org.mxchange.addressbook.model.shared;
 
 import java.text.MessageFormat;
 import java.util.List;
+import java.util.Objects;
 import javax.ejb.Stateless;
 import javax.persistence.NoResultException;
 import javax.persistence.Query;
+import org.mxchange.addressbook.exceptions.UserAlreadySharingAddressbookException;
+import org.mxchange.addressbook.model.addressbook.Addressbook;
 import org.mxchange.addressbook.model.addressbook.shared.AddressbookShare;
 import org.mxchange.addressbook.model.addressbook.shared.ShareableAddressbook;
 import org.mxchange.jcoreee.database.BaseDatabaseBean;
@@ -85,7 +88,7 @@ public class SharedAddressbooksSessionBean extends BaseDatabaseBean implements S
                        this.shares = query.getResultList();
 
                        // Debug message
-                       this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserSharingAddressbooks: shares.size()={0}", this.shares.size()));
+                       this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserSharingAddressbooks: shares.size()={0}", this.shares.size())); //NOI18N
 
                        // Is it not empty?
                        isSharing = (!this.shares.isEmpty());
@@ -100,4 +103,99 @@ public class SharedAddressbooksSessionBean extends BaseDatabaseBean implements S
                // Return it
                return isSharing;
        }
+
+       @Override
+       public ShareableAddressbook startSharing (final User sharee, final Addressbook addressbook) throws UserAlreadySharingAddressbookException {
+               // Trace message
+               this.getLoggerBeanLocal().logTrace(MessageFormat.format("startSharing: sharee={0},addressbook={1} - CALLED!", sharee, addressbook)); //NOI18N
+
+               // Check all conditions
+               if (null == sharee) {
+                       // Throw NPE
+                       throw new NullPointerException("sharee is null"); //NOI18N
+               } else if (sharee.getUserId() == null) {
+                       // Throw NPE again
+                       throw new NullPointerException("sharee.userId is null"); //NOI18N
+               } else if (sharee.getUserId() < 1) {
+                       // Invalid id number
+                       throw new IllegalStateException(MessageFormat.format("sharee.userId={0} is invalid", sharee.getUserId())); //NOI18N
+               } else if (null == addressbook) {
+                       // Throw NPE again
+                       throw new NullPointerException("addressbook is null"); //NOI18N
+               } else if (addressbook.getAddressbookId() == null) {
+                       // Throw NPE again
+                       throw new NullPointerException("addressbook.addressbookId is null"); //NOI18N
+               } else if (addressbook.getAddressbookId() < 1) {
+                       // Invalid id number
+                       throw new IllegalArgumentException(MessageFormat.format("addressbook.addressbookId={0} is invalid.", addressbook.getAddressbookId())); //NOI18N
+               } else if (Objects.equals(addressbook.getAddressbookUser(), sharee)) {
+                       // Sharing with yourself!
+                       throw new IllegalStateException("User tries to share with himself."); //NOI18N
+               }
+
+               // Is the entry already there?
+               if (this.isUserAlreadySharingAddressbook(addressbook, sharee)) {
+                       // Abort here
+                       throw new UserAlreadySharingAddressbookException(addressbook, sharee);
+               }
+
+               // All fine so far, then create the instance
+               ShareableAddressbook share = new AddressbookShare(addressbook, sharee);
+
+               // Debug message
+               this.getLoggerBeanLocal().logDebug(MessageFormat.format("startSharing: share={0}", share));
+
+               // Persist it
+               this.getEntityManager().persist(share);
+
+               // Flush to get id number
+               this.getEntityManager().flush();
+
+               // Return updated instance
+               return share;
+       }
+
+       /**
+        * Checks whether the owner of the given address book is already sharing it
+        * with the sharee.
+        * <p>
+        * @param addressbook Address book to be shared with
+        * @param sharee User sharee instance
+        * @return Wether the address book is already shared with the sharee
+        */
+       private boolean isUserAlreadySharingAddressbook (final Addressbook addressbook, final User sharee) {
+               // Trace message
+               this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserAlreadySharingAddressbook: addressbook={0},sharee={1} - CALLED!", addressbook, sharee)); //NOI18N
+
+               // Get named query
+               Query query = this.getEntityManager().createNamedQuery("SearchShareeAddressbookShare", AddressbookShare.class); //NOI18N
+
+               // Set parameter
+               query.setParameter("addressbook", addressbook); //NOI18N
+               query.setParameter("sharee", sharee); //NOI18N
+
+               // Default is not found
+               boolean isFound = false;
+
+               // Try it
+               try {
+                       // Get single instance
+                       ShareableAddressbook share = (ShareableAddressbook) query.getSingleResult();
+
+                       // Debug message
+                       this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserAlreadySharingAddressbook: share={0} - FOUND!", share)); //NOI18N
+
+                       // Set found
+                       isFound = true;
+               } catch (final NoResultException ex) {
+                       // Not found, log exception
+                       this.getLoggerBeanLocal().logDebug(MessageFormat.format("isUserAlreadySharingAddressbook: Notfound. Exception: {0}", ex)); //NOI18N
+               }
+
+               // Trace message
+               this.getLoggerBeanLocal().logTrace(MessageFormat.format("isUserAlreadySharingAddressbook: isFound={0} - EXIT!", isFound)); //NOI18N
+
+               // Return it
+               return isFound;
+       }
 }