Start working on servlets

Author: balins

server/src/main/java/com/balinski/api_project/Main.java

@@ -32,7 +32,6 @@ static void testDatabase() {
                 System.out.println(film.getTitle());
         } catch (DaoException e) {
             e.printStackTrace();
-            System.exit(-1);
         }
     }
 }

server/src/main/java/com/balinski/api_project/database/dao/Dao.java

@@ -21,19 +21,19 @@ public int getCount() throws DaoException {
         return ((Long)result.get(0).get("COUNT")).intValue();
     }
 
-    public T getById(int id) throws DaoException {
+    public List<T> getById(int id) throws DaoException {
         List<Map<String, Object>> result = DaoManager.getData(
                     String.format("SELECT * FROM %s T WHERE T.%s_ID = %d;", type.toString(), type.toString(), id)
             );
 
-        return result.size() > 0 ? toListOfObjects(result).get(0) : null;
+        return toListOfObjects(result);
     }
 
     public List<T> getAll() throws DaoException {
         List<Map<String, Object>> result = DaoManager.getData(
                     String.format("SELECT * FROM %s;", type.toString())
         );
-
+        
         return toListOfObjects(result);
     }
 

server/src/main/java/com/balinski/api_project/server/handler/WebAppContextWrapper.java

@@ -24,10 +24,10 @@ public WebAppContext getWebAppContext() {
     }
 
     private void registerServlets() {
-        context.addServlet(ActorServlet.class, "/actors");
-        context.addServlet(FilmServlet.class, "/films");
-        context.addServlet(LanguageServlet.class, "/languages");
-        context.addServlet(UserServlet.class, "/users");
+        context.addServlet(ActorServlet.class, "/actors/*");
+        context.addServlet(FilmServlet.class, "/films/*");
+        context.addServlet(LanguageServlet.class, "/languages/*");
+        context.addServlet(UserServlet.class, "/users/*");
     }
 
 }

server/src/main/java/com/balinski/api_project/servlet/ActorServlet.java

@@ -10,20 +10,54 @@
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.io.PrintWriter;
-import java.util.List;
+import java.util.*;
+import java.util.stream.Collectors;
 
 
 public class ActorServlet extends HttpServlet {
     @Override
     public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
         resp.setHeader("Content-Type", "application/vnd.api+json");
         PrintWriter writer = resp.getWriter();
+
+        var enumeration = req.getParameterNames();
+
+        var supportedParameters = Set.of("id", "page", "perPage", "firstName", "lastName", "order");
+        var param = Collections.list(enumeration)
+                .stream()
+                .distinct()
+                .filter(supportedParameters::contains)
+                .collect(Collectors.toMap(x -> x, req::getParameter));
+
+        List<Actor> actors;
+        var dao = DaoManager.getActorDao();
+
         try {
-            List<Actor> actors = DaoManager.getActorDao().getAll();
+            if(param.get("id") != null)
+                actors = dao.getById(Integer.parseInt(param.get("id")));
+            else if(param.get("firstName") != null)
+                actors = dao.getByFirstName(param.get("firstName"));
+            else if(param.get("lastName") != null)
+                actors = dao.getByLastName(param.get("lastName"));
+            else if(param.get("perPage") != null && param.get("page") != null) {
+                int perPage = Integer.parseInt(param.get("perPage"));
+                int page = Integer.parseInt(param.get("page"));
+                actors = dao.getIdBetween(perPage*page+1, perPage*(page+1));
+            } else {
+                actors = dao.getAll();
+            }
+
+            if(param.get("order") != null) {
+                if(param.get("order").equalsIgnoreCase("desc"))
+                    actors.sort(Comparator.comparing(Actor::getLastName).thenComparing(Actor::getFirstName).reversed());
+                else
+                    actors.sort(Comparator.comparing(Actor::getLastName).thenComparing(Actor::getFirstName));
+            }
+
             String response = JsonResponseBuilder.mergeFromList(actors);
             writer.print(response);
         } catch (DaoException e) {
-            System.err.println("An error occured in ActorServlet: " + e.getMessage());
+            System.err.println("An error occurred in ActorServlet: " + e.getMessage());
             writer.print(JsonResponseBuilder.getErrorJson(e));
             e.printStackTrace();
         }