add replace data value with object

Author: Squaretechre

src/com/danparkin/organizingdata/replacedatavaluewithobject/Client.java

@@ -0,0 +1,13 @@
+package com.danparkin.organizingdata.replacedatavaluewithobject;
+
+import java.util.ArrayList;
+
+public class Client {
+    public static int numberOfOrdersFor(ArrayList<Order> orders, String customer) {
+        int result = 0;
+        for(Order order : orders) {
+            if(order.getCustomer().equals(customer)) result++;
+        }
+        return result;
+    }
+}

src/com/danparkin/organizingdata/replacedatavaluewithobject/Order.java

@@ -0,0 +1,17 @@
+package com.danparkin.organizingdata.replacedatavaluewithobject;
+
+public class Order {
+    private String _customer;
+
+    public Order(String customer) {
+        _customer = customer;
+    }
+
+    public String getCustomer() {
+        return _customer;
+    }
+
+    public void setCustomer(String arg) {
+        _customer = arg;
+    }
+}

src/com/danparkin/organizingdata/replacedatavaluewithobject/README.md

@@ -0,0 +1,24 @@
+# Replace Data Value with Object
+
+## Organizing Data
+
+### Problem
+You have a data item that needs additional data or behavior.
+
+### Solution
+Turn the data item into an object.
+
+                            ---------------
+                            Order
+                            ---------------
+                            customer:String
+                            
+                                   |
+                                   |
+                                  
+               ----------                    -----------
+               Order        <>------------>  Customer
+               ----------                    -----------
+                                             name:String
+
+Page 175 - Martin Fowler's "Refactoring - Improving The Design of Existing Code".

src/com/danparkin/selfencapsulatefield/IntRange.java src/com/danparkin/organizingdata/selfencapsulatefield/IntRange.java

@@ -1,4 +1,4 @@
-package com.danparkin.selfencapsulatefield;
+package com.danparkin.organizingdata.selfencapsulatefield;
 
 public class IntRange {
     private int _low;

src/com/danparkin/selfencapsulatefield/README.md src/com/danparkin/organizingdata/selfencapsulatefield/README.md

@@ -0,0 +1,29 @@
+package organizingdata;
+
+import com.danparkin.organizingdata.replacedatavaluewithobject.Client;
+import com.danparkin.organizingdata.replacedatavaluewithobject.Order;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class ReplaceDataValueWithObjectTests {
+    @Test
+    public void calculates_the_correct_number_of_orders_for_a_given_customer() {
+        String johnDoe = "John Doe";
+        String janeDoe = "Jane Doe";
+        Order first = new Order(johnDoe);
+        Order second = new Order(johnDoe);
+        Order third = new Order(johnDoe);
+        Order fourth = new Order(janeDoe);
+        ArrayList<Order> orders = new ArrayList<Order>() {{
+            add(first);
+            add(second);
+            add(third);
+            add(fourth);
+        }};
+        assertEquals(3, Client.numberOfOrdersFor(orders, johnDoe));
+        assertEquals(1, Client.numberOfOrdersFor(orders, janeDoe));
+    }
+}

src/test/organizingdata/ReplaceDataValueWithObjectTests.java

@@ -1,4 +1,6 @@
-import com.danparkin.selfencapsulatefield.IntRange;
+package organizingdata;
+
+import com.danparkin.organizingdata.selfencapsulatefield.IntRange;
 import org.junit.Test;
 
 import static junit.framework.TestCase.assertTrue;