Feat: adds Custom Exception

Author: PabLim-Par

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/ecommerce/Order.java

@@ -11,15 +11,25 @@ public Order(String orderId, Product product, int quantity) {
     this.quantity = quantity;
   }
 
-  public String getOrderId() {
+  public String getOrderId() throws OrderNotFoundException {
+    if (orderId == null) {
+      throw new OrderNotFoundException("This order does not match any in our records");
+    }
     return orderId;
   }
 
-  public Product getProduct() {
+  public Product getProduct() throws OrderNotFoundException {
+    if (product == null) {
+      throw new OrderNotFoundException("This Product is not in our system.");
+    }
     return product;
   }
 
-  public int getQuantity() {
+  public int getQuantity() throws OrderNotFoundException {
+    if (quantity == 0) {
+      throw new OrderNotFoundException("Out of Stock.");
+    }
+
     return quantity;
   }
 }

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/ecommerce/OrderNotFoundException.java

@@ -5,4 +5,8 @@
 
 package com.codedifferently.lesson14.ecommerce;
 
-class OrderNotFoundException {}
+class OrderNotFoundException extends Exception {
+  public OrderNotFoundException(String message) {
+    super(message);
+  }
+}

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/ecommerce/Product.java

@@ -9,11 +9,25 @@ public Product(String productId, String name) {
     this.name = name;
   }
 
-  public String getProductId() {
+  public String getProductId() /*throws ProductNotFoundException*/ {
+    if (productId == null) {
+      try {
+        throw new ProductNotFoundException("The product ID can not be found.");
+      } catch (ProductNotFoundException e) {
+        System.out.println(e);
+      }
+    }
     return productId;
   }
 
-  public String getName() {
+  public String getName() /*throws ProductNotFoundException*/ {
+    if (name == null) {
+      try {
+        throw new ProductNotFoundException("Nothing matches that name");
+      } catch (ProductNotFoundException e) {
+        System.out.println(e);
+      }
+    }
     return name;
   }
 }

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/ecommerce/ProductNotFoundException.java

@@ -5,4 +5,8 @@
 
 package com.codedifferently.lesson14.ecommerce;
 
-class ProductNotFoundException {}
+class ProductNotFoundException extends Exception {
+  public ProductNotFoundException(String message) {
+    super(message);
+  }
+}