From 706db1dc9f90b95ec00079f2847bfbb8b6e42667 Mon Sep 17 00:00:00 2001
From: = <tommyah@stud.ntnu.no>
Date: Mon, 25 May 2026 19:48:50 +0200
Subject: [PATCH] Feat: Updated validation for share

---
 .../idi/idatt2003/g40/mappe/model/Share.java   | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/model/Share.java b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/model/Share.java
index 3328a74..30aba43 100644
--- a/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/model/Share.java
+++ b/src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/model/Share.java
@@ -32,13 +32,25 @@ public final class Share {
    * @param quantity      the quantity purchased
    * @param purchasePrice the price per unit at purchase time
    *
-   * @throws IllegalArgumentException if stock is null.
+   * @throws IllegalArgumentException if parameters are null or invalid.
    */
   public Share(final Stock stock,
                final BigDecimal quantity,
                final BigDecimal purchasePrice) throws IllegalArgumentException {
-    if (stock == null) {
-      throw new IllegalArgumentException("Invalid stock!");
+    if (stock == null
+        || quantity == null
+        || purchasePrice == null) {
+      throw new IllegalArgumentException("Invalid share configuration!");
+    }
+    if (quantity.compareTo(BigDecimal.ZERO) <= 0) {
+      throw new IllegalArgumentException(
+              "Quantity cannot be negative or zero!"
+      );
+    }
+    if (purchasePrice.compareTo(BigDecimal.ZERO) <= 0) {
+      throw new IllegalArgumentException(
+              "Purchase price cannot be negative or zero!"
+      );
     }
     this.stock = stock;
     this.quantity = quantity;