From 2c457f9c05ccbdf384abac90077fe7d6e609d762 Mon Sep 17 00:00:00 2001
From: Peter Hertkorn <peter.hertkorn@reutlingen-university.de>
Date: Sat, 10 Oct 2020 15:20:19 +0200
Subject: [PATCH] Add dynamic loading of pizza classes (NY style)
---
src/pizzeria/NYPizzaStore.java | 29 +++++++++++++++++++----------
src/pizzeria/nypizza.properties | 5 +++++
2 files changed, 24 insertions(+), 10 deletions(-)
create mode 100644 src/pizzeria/nypizza.properties
diff --git a/src/pizzeria/NYPizzaStore.java b/src/pizzeria/NYPizzaStore.java
index 9c940c8..f3480ec 100644
--- a/src/pizzeria/NYPizzaStore.java
+++ b/src/pizzeria/NYPizzaStore.java
@@ -1,17 +1,26 @@
package pizzeria;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Properties;
+
public class NYPizzaStore extends PizzaStore {
Pizza createPizza(String item) {
- if (item.equals("cheese")) {
- return new NYStyleCheesePizza();
- } else if (item.equals("veggie")) {
- return new NYStyleVeggiePizza();
- } else if (item.equals("clam")) {
- return new NYStyleClamPizza();
- } else if (item.equals("pepperoni")) {
- return new NYStylePepperoniPizza();
- } else return null;
+ Pizza pizza = null;
+
+ Properties properties = new Properties();
+ try {
+ properties.load(this.getClass().getResourceAsStream("nypizza.properties"));
+ String pizzaName = properties.getProperty(item);
+ Class<?> classOfPizza = Class.forName(pizzaName);
+ Constructor<Pizza> constructor = (Constructor<Pizza>) classOfPizza.getConstructor(new Class[]{});
+ pizza = constructor.newInstance();
+ } catch (IOException | ClassNotFoundException | InstantiationException | IllegalAccessException |
+ NoSuchMethodException | InvocationTargetException e) {
+ e.printStackTrace();
+ }
+ return pizza;
}
-
}
diff --git a/src/pizzeria/nypizza.properties b/src/pizzeria/nypizza.properties
new file mode 100644
index 0000000..ff37049
--- /dev/null
+++ b/src/pizzeria/nypizza.properties
@@ -0,0 +1,5 @@
+cheese=pizzeria.NYStyleCheesePizza
+clam=pizzeria.NYStyleClamPizza
+pepperoni=pizzeria.NYStylePepperoniPizza
+veggie=pizzeria.NYStyleVeggiePizza
+salami=pizzeria.NYStyleSalamiPizza
--
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