Added exeption handling for Message class

helpmehelpapplication/src/main/java/ntnu/sytemutvikling/team6/models/Message.java

@@ -3,42 +3,51 @@
 import java.time.LocalDateTime;
 import java.util.UUID;
 
-// Unntakshåndtering mangler
 // Enhetstester mangler
 
 /**
  * Represents a message
  *
- * @Author Robin Strand Prestmo
+ * @author  Robin Strand Prestmo
  */
 public class Message {
-  private UUID id;
-  private String title;
-  private String from;
-  private String content;
-  private LocalDateTime timeAndDate;
+  private final UUID id;
+  private final String title;
+  private final String from;
+  private final String content;
+  private final LocalDateTime timeAndDate;
 
   /**
-   * Creates a message with an unique identifier.
-   * The message includes a title, a string who its from,
+   * Creates a message with a unique identifier.
+   * The message includes a title, a string who it's from,
    * content and the time and date.
    *
-   * @param id an unique identifier using UUID
    * @param title the title of the message
    * @param from who the message is from
    * @param content the content of the message
-   * @param timeAndDate when the message was sent.
+   * @throws IllegalArgumentException if title, from or content is null or blank.
    */
-  public Message(UUID id,
-                 String title,
+  public Message(String title,
                  String from,
-                 String content,
-                 LocalDateTime timeAndDate) {
-    this.id = id;
+                 String content) {
+
+    if (title == null || title.isBlank()) {
+      throw new IllegalArgumentException("Title cannot be null or blank.");
+    }
+
+    if (from == null || from.isBlank()) {
+      throw new IllegalArgumentException("From cannot be null or blank.");
+    }
+
+    if (content == null || content.isBlank()) {
+      throw new IllegalArgumentException("Content cannot be null or blank.");
+    }
+
+    this.id = UUID.randomUUID();
     this.title = title;
     this.from = from;
     this.content = content;
-    this.timeAndDate = timeAndDate;
+    this.timeAndDate = LocalDateTime.now();
   }
 
   public UUID getId() {