Homework ;)

oop-workshop.iml

@@ -21,5 +21,27 @@
       </library>
     </orderEntry>
     <orderEntry type="library" name="org.hamcrest:hamcrest-core:2.1" level="project" />
+    <orderEntry type="module-library" scope="TEST">
+      <library name="JUnit4">
+        <CLASSES>
+          <root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.12/junit-4.12.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+    <orderEntry type="module-library" scope="TEST">
+      <library name="JUnit5.3">
+        <CLASSES>
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.4.0/junit-jupiter-api-5.4.0.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.0.0/apiguardian-api-1.0.0.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.1.1/opentest4j-1.1.1.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.4.0/junit-platform-commons-1.4.0.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
   </component>
 </module>

src/checkout/ByCategory.java

@@ -0,0 +1,19 @@
+package checkout;
+
+public class ByCategory implements Condition {
+    private Category category;
+
+    public ByCategory(Category category) {
+        this.category = category;
+    }
+
+    @Override
+    public boolean inCondition(Check check) {
+        return check.getCostByCategory(category) > 0;
+    }
+
+    @Override
+    public int getPointsByCondition(Check check) {
+        return check.getCostByCategory(category);
+    }
+}

src/checkout/ByTrademark.java

@@ -0,0 +1,19 @@
+package checkout;
+
+public class ByTrademark implements  Condition {
+    private Trademark trademark;
+
+    public ByTrademark(Trademark trademark) {
+        this.trademark = trademark;
+    }
+
+    @Override
+    public boolean inCondition(Check check) {
+        return check.getCostByTrademark(trademark) > 0;
+    }
+
+    @Override
+    public int getPointsByCondition(Check check) {
+        return check.getCostByTrademark(trademark);
+    }
+}

src/checkout/Category.java

@@ -1,5 +1,6 @@
 package checkout;
 
 public enum Category {
-    MILK
+    MILK,
+    MEAT
 }

src/checkout/Check.java

@@ -6,6 +6,7 @@
 public class Check {
     private List<Product> products = new ArrayList<>();
     private int points = 0;
+    private int discount = 0;
 
     public int getTotalCost() {
         int totalCost = 0;
@@ -33,4 +34,19 @@ int getCostByCategory(Category category) {
                 .mapToInt(p -> p.price)
                 .reduce(0, (a, b) -> a + b);
     }
+
+    int getCostByTrademark(Trademark trademark) {
+        return products.stream()
+                .filter(p -> p.trademark == trademark)
+                .mapToInt(p -> p.price)
+                .reduce(0, (a, b) -> a + b);
+    }
+
+    void addDiscount(int discount) {
+        this.discount += discount;
+    }
+
+    public int getDiscount() {
+        return discount;
+    }
 }

src/checkout/CheckoutService.java

@@ -1,8 +1,12 @@
 package checkout;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class CheckoutService {
 
-    private Check check;
+    private Check check = new Check();
+    private List<Offer> offers = new ArrayList<>();
 
     public void openCheck() {
         check = new Check();
@@ -16,23 +20,15 @@ public void addProduct(Product product) {
     }
 
     public Check closeCheck() {
+        for (Offer of : offers) {
+            of.apply(check);
+        }
         Check closedCheck = check;
         check = null;
         return closedCheck;
     }
 
     public void useOffer(Offer offer) {
-        offer.apply(check);
-        if (offer instanceof FactorByCategoryOffer) {
-            FactorByCategoryOffer fbOffer = (FactorByCategoryOffer) offer;
-            int points = check.getCostByCategory(fbOffer.category);
-            check.addPoints(points * (fbOffer.factor - 1));
-        } else {
-            if (offer instanceof AnyGoodsOffer) {
-                AnyGoodsOffer agOffer = (AnyGoodsOffer) offer;
-                if (agOffer.totalCost <= check.getTotalCost())
-                    check.addPoints(agOffer.points);
-            }
-        }
+        offers.add(offer);
     }
 }

src/checkout/Condition.java

@@ -0,0 +1,7 @@
+package checkout;
+
+public interface Condition {
+    boolean inCondition(Check check);
+
+    int getPointsByCondition(Check check);
+}

src/checkout/Discount.java

@@ -0,0 +1,15 @@
+package checkout;
+
+public class Discount implements Reward {
+    private int discont;
+
+    public Discount(int discont) {
+        this.discont = discont;
+    }
+
+    @Override
+    public void useReward(Check check, Condition condition) {
+        int points = condition.getPointsByCondition(check);
+        check.addDiscount((int) Math.round(points * (discont / 100d)));
+    }
+}

src/checkout/Factor.java

@@ -0,0 +1,15 @@
+package checkout;
+
+public class Factor implements Reward {
+    private int factor;
+
+    public Factor(int factor) {
+        this.factor = factor;
+    }
+
+    @Override
+    public void useReward(Check check, Condition condition) {
+        int points = condition.getPointsByCondition(check);
+        check.addPoints(points * (factor - 1));
+    }
+}

src/checkout/Flat.java

@@ -0,0 +1,14 @@
+package checkout;
+
+public class Flat implements Reward {
+    private int points;
+
+    public Flat(int points) {
+        this.points = points;
+    }
+
+    @Override
+    public void useReward(Check check, Condition condition) {
+        check.addPoints(points);
+    }
+}

src/checkout/Offer.java

@@ -1,5 +1,10 @@
 package checkout;
 
+import java.util.Date;
+
 public abstract class Offer {
     public abstract void apply(Check check);
+    public  boolean isValid(Date expirationDate) {
+        return expirationDate.after(new Date());
+    };
 }

src/checkout/Product.java

@@ -4,14 +4,23 @@ public class Product {
     final int price;
     final String name;
     Category category;
+    Trademark trademark;
 
     public Product(int price, String name, Category category) {
         this.price = price;
         this.name = name;
         this.category = category;
     }
 
+    public Product(int price, String name, Category category, Trademark trademark) {
+        this.price = price;
+        this.name = name;
+        this.category = category;
+        this.trademark = trademark;
+    }
+
+
     public Product(int price, String name) {
-        this(price, name, null);
+        this(price, name, null, null);
     }
 }