refactor : 다형성을 이용해 분기삭제

#6

src/main/java/RequestHandler.java

@@ -1,5 +1,4 @@
-import model.HttpRequestMethod;
-import model.User;
+import controller.Controller;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import view.request.HttpRequest;
@@ -24,29 +23,16 @@ public void run() {
             HttpResponse response = new HttpResponse(out);
 
             String path = request.getPath();
-            String method = request.getMethod();
-
-            if("/users/create".equals(path) && HttpRequestMethod.POST.equals(method)) {
-                User user = new User(request.getParameter("userId"),
-                        request.getParameter("password"),
-                        request.getParameter("name"),
-                        request.getParameter("email"));
-                String result = user.toString();
-
-                response.sendResponse(result);
-            }
-
-            else if(path.startsWith("/users") && HttpRequestMethod.GET.equals(method)) {
-                int wannaSize = Integer.parseInt(request.getParameter("size"));
-                String result = wannaSize + "만큼의 유저 정보를 읽기 원합니다.";
-
-                response.sendResponse(result);
+            log.info(path);
+            Controller controller = RequestMapping.getController(path);
+            if(controller == null) {
+                response.sendResponse("안녕하세요!");
             }
-
             else {
-                response.sendResponse("안녕하세요!");
+                controller.service(request, response);
             }
 
+
         } catch (IOException e) {
             log.error(e.getMessage());
         }

src/main/java/RequestMapping.java

@@ -0,0 +1,18 @@
+import controller.Controller;
+import controller.CreateUserController;
+import controller.UserListController;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class RequestMapping {
+    private static Map<String, Controller> controllers = new HashMap<>();
+    static {
+        controllers.put("/user/create", new CreateUserController());
+        controllers.put("/users", new UserListController());
+    }
+
+    public static Controller getController(String requestUrl) {
+        return controllers.get(requestUrl);
+    }
+}

src/main/java/controller/AbstractController.java

@@ -0,0 +1,24 @@
+package controller;
+
+import model.HttpRequestMethod;
+import view.request.HttpRequest;
+import view.response.HttpResponse;
+
+public abstract class AbstractController implements Controller{
+    @Override
+    public void service(HttpRequest request, HttpResponse response) {
+
+        if(HttpRequestMethod.POST.equals(request.getMethod())) {
+            doPost(request, response);
+        }
+        else {
+            doGet(request, response);
+        }
+    }
+
+    protected void doGet(final HttpRequest request, final HttpResponse response) {
+    }
+
+    protected void doPost(final HttpRequest request, final HttpResponse response) {
+    }
+}

src/main/java/controller/Controller.java

@@ -0,0 +1,8 @@
+package controller;
+
+import view.request.HttpRequest;
+import view.response.HttpResponse;
+
+public interface Controller {
+    void service(HttpRequest request, HttpResponse response);
+}

src/main/java/controller/CreateUserController.java

@@ -0,0 +1,22 @@
+package controller;
+
+import model.User;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import view.request.HttpRequest;
+import view.response.HttpResponse;
+
+public class CreateUserController extends AbstractController {
+    private static final Logger log = LoggerFactory.getLogger(CreateUserController.class);
+
+    @Override
+    public void doPost(final HttpRequest request, final HttpResponse response) {
+        User user = new User(request.getParameter("userId"),
+                request.getParameter("password"),
+                request.getParameter("name"),
+                request.getParameter("email"));
+        String result = user.toString();
+
+        response.sendResponse(result);
+    }
+}

src/main/java/controller/UserListController.java

@@ -0,0 +1,18 @@
+package controller;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import view.request.HttpRequest;
+import view.response.HttpResponse;
+
+public class UserListController extends AbstractController {
+    private static final Logger log = LoggerFactory.getLogger(UserListController.class);
+
+    @Override
+    public void doGet(final HttpRequest request, final HttpResponse response) {
+        int wannaSize = Integer.parseInt(request.getParameter("size"));
+        String result = wannaSize + "만큼의 유저 정보를 읽기 원합니다.";
+
+        response.sendResponse(result);
+    }
+}