GoF 빌더 패턴

src/gof/dp/builder/ChicagoPizza.java

@@ -0,0 +1,37 @@
+package gof.dp.builder;
+
+public class ChicagoPizza extends Pizza{
+
+    private final boolean sauceInside;
+
+    public static class Builder extends Pizza.Builder{
+
+        private boolean sauceInside = false;
+
+        public Builder sauceInside(){
+            sauceInside = true;
+            return this;
+        }
+
+        @Override
+        Pizza build() {
+            return new ChicagoPizza(this);
+        }
+
+        @Override
+        protected Pizza.Builder self() {
+            return this;
+        }
+    }
+
+
+    ChicagoPizza(Builder builder) {
+        super(builder);
+        this.sauceInside = builder.sauceInside;
+    }
+
+    public String toString() {
+        return toppings.toString() + " sauceInside: " + sauceInside;
+    }
+
+}

src/gof/dp/builder/NewYorkPizza.java

@@ -0,0 +1,33 @@
+package gof.dp.builder;
+
+import java.util.Objects;
+
+public class NewYorkPizza extends Pizza{
+
+    public enum Size {LARGE, FAMILY, MONSTER};
+    private final Size size;
+
+    public static class Builder extends Pizza.Builder{
+        private  final Size size;
+
+
+        public Builder(Size size){
+            this.size = Objects.requireNonNull(size);
+        }
+
+        @Override
+        public NewYorkPizza build(){
+            return new NewYorkPizza(this);
+        }
+
+        @Override
+        protected Builder self() {
+            return this;
+        }
+    }
+
+    private NewYorkPizza(Builder builder) {
+        super(builder);
+        size = builder.size;
+    }
+}

src/gof/dp/builder/Pizza.java

@@ -0,0 +1,34 @@
+package gof.dp.builder;
+
+import java.util.EnumSet;
+import java.util.Objects;
+import java.util.Set;
+
+public abstract class Pizza {
+
+    public enum Topping {HAM, MUSHROOM, ONION, PEPPER, SAUSAGE};
+    final Set<Topping> toppings;
+
+    abstract static class Builder {
+        EnumSet<Topping> toppings = EnumSet.noneOf(Topping.class);
+
+        public Builder addTopping(Topping topping) {
+            toppings.add(Objects.requireNonNull(topping));
+            return self();
+        }
+        public Builder sauceInside(){
+            return self();
+        }
+
+        abstract Pizza build();
+        protected abstract Builder self();
+    }
+
+    Pizza(Builder builder){
+        toppings = builder.toppings.clone();
+    }
+
+    public String toString(){
+        return toppings.toString();
+    }
+}

src/gof/dp/builder/PizzaMaster.java

@@ -0,0 +1,22 @@
+package gof.dp.builder;
+
+public class PizzaMaster {
+
+    public static void main(String[] args){
+        Pizza newYorkPizza = new NewYorkPizza.Builder(NewYorkPizza.Size.LARGE)
+//                .sauceInside()
+                .addTopping(Pizza.Topping.HAM)
+                .addTopping(Pizza.Topping.ONION)
+                .build();
+
+        Pizza ChicagoPizza = new ChicagoPizza.Builder()
+                .sauceInside()
+                .addTopping(Pizza.Topping.MUSHROOM)
+                .addTopping(Pizza.Topping.SAUSAGE)
+                .addTopping(Pizza.Topping.PEPPER)
+                .build();
+
+        System.out.println(newYorkPizza);
+        System.out.println(ChicagoPizza);
+    }
+}