feat: convert Donation to record and add throws to constructor

src/main/java/edu/group5/app/model/donation/Donation.java

@@ -5,73 +5,49 @@
 
 /**
  * Represents a verified donation made by a user to an organization.
+ * @param donationId     - the unique ID of this donation
+ * @param userId         - the ID of the user making the donation
+ * @param organizationId - the ID of the organization receiving the donation
+ * @param amount         - the donation amount
+ * @param date           - the timestamp when the donation was made
+ * @param paymentMethod  - the payment method used
  */
-public class Donation {
-  private final int donationId;
-  private final int userId;
-  private final int organizationId;
-  private final BigDecimal amount;
-  private final Timestamp date;
-  private final String paymentMethod;
+public record Donation(
+    int donationId,
+    int userId,
+    int organizationId,
+    BigDecimal amount,
+    Timestamp date,
+    String paymentMethod) {
 
   /**
-   * Constructs a new Donation.
+   * Constructor with throws.
    *
-   * @param donationId - the unique ID of this donation
-   * @param userId - the ID of the user making the donation
-   * @param organizationId - the ID of the organization receiving the donation
-   * @param amount - the donation amount
-   * @param date - the timestamp when the donation was made
-   * @param paymentMethod - the payment method used
+   * @param donationId - throws if donationID is negative or 0.
+   * @param userId - throws if userID is negative or 0.
+   * @param organizationId - throws if organizationID is negative or 0.
+   * @param amount - throws if amount is negative or null.
+   * @param date - throws if date is null.
+   * @param paymentMethod - throws if payment is null or blank.
    */
-  public Donation(int donationId, int userId, int organizationId, BigDecimal amount, Timestamp date, String paymentMethod) {
-    this.donationId = donationId;
-    this.userId = userId;
-    this.organizationId = organizationId;
-    this.amount = amount;
-    this.date = date;
-    this.paymentMethod = paymentMethod;
-  }
-
-  /**
-   * @return the donation ID
-   */
-  public int getDonationId(){
-    return donationId;
-  }
-
-  /**
-   * @return the user ID of the donator
-   */
-  public int getUserId(){
-    return userId;
-  }
-
-  /**
-   * @return the organization ID that receives the donation
-   */
-  public int getOrganizationId() {
-    return organizationId;
-  }
-
-  /**
-   * @return the donated amount
-   */
-  public BigDecimal getAmount() {
-    return amount;
-  }
-
-  /**
-   * @return the timestamp of the donation
-   */
-  public Timestamp getDate() {
-    return date;
-  }
-
-  /**
-   * @return the payment method used
-   */
-  public String getPaymentMethod() {
-    return paymentMethod;
+  public Donation {
+    if (donationId <= 0) {
+      throw new IllegalArgumentException("Donation ID must be positive");
+    }
+    if (userId <= 0) {
+      throw new IllegalArgumentException("User ID must be positive");
+    }
+    if (organizationId <= 0) {
+      throw new IllegalArgumentException("Organization ID must be positive");
+    }
+    if (amount == null || amount.compareTo(BigDecimal.ZERO) <= 0) {
+      throw new IllegalArgumentException("Amount must be positive and not null");
+    }
+    if (date == null) {
+      throw new IllegalArgumentException("Date must not be null");
+    }
+    if (paymentMethod == null || paymentMethod.isBlank()) {
+      throw new IllegalArgumentException("Payment method must not be empty");
+    }
   }
 }