added possibility to limit the amount of emails to be read

network/src/main/java/de/muehlencord/shared/network/mail/DefaultMailReader.java

@@ -307,6 +307,43 @@ public abstract class DefaultMailReader implements MailReader {
 
         return returnValue;
     }
+    
+    /**
+     * retrieves the list of messages stored in the given folder
+     *
+     * @param sourceFolder the folder to search return the emails for
+     * @param start the number of the first message
+     * @param end the number of the last message
+     * @return list of messages stored in the given folder
+     *
+     * @throws MailReaderException if the message list cannot be retrieved
+     *
+     */
+    @Override
+    public List<MailMessage> getMessages(String sourceFolder, int start, int end) throws MailReaderException {
+        List<MailMessage> returnValue = new LinkedList<>();
+        Folder folder = getFolderObject(sourceFolder);
+        try {
+            folder.open(Folder.READ_ONLY);
+            Message[] messages = folder.getMessages(start, end);
+            for (Message msg : messages) {
+                returnValue.add(MailMessageUtils.getInstance(getValidMessage(msg)));
+            }
+        } catch (Exception ex) {
+            throw new MailReaderException("Cannot fetch email from folder " + folder.getFullName() + ". Reason: " + ex.getMessage(), ex);
+
+        } finally {
+            if ((folder != null) && (folder.isOpen())) {
+                try {
+                    folder.close(false);
+                } catch (MessagingException ex) {
+                    LOGGER.debug(StringUtil.getStackTraceString(ex));
+                }
+            }
+        }
+
+        return returnValue;
+    }    
 
     /**
      * copies the given message from the source folder to the destination folder

network/src/main/java/de/muehlencord/shared/network/mail/MailReader.java

@@ -70,6 +70,17 @@ public interface MailReader {
      *
      */
     List<MailMessage> getMessages(String folder) throws MailReaderException;
+    
+    /**
+     * retrieves the list of messages stored in the given folder
+     *
+     * @param folder the folder to search return the emails for
+     * @return list of messages stored in the given folder
+     *
+     * @throws MailReaderException if the message list cannot be retrieved
+     *
+     */
+    List<MailMessage> getMessages(String folder, int start, int end) throws MailReaderException;    
 
     /**
      * copies the given message from the source folder to the destination folder