Improved admin user rest API semantics

src/main/java/org/ros/chatto/controller/AdminRESTController.java

@@ -3,6 +3,7 @@ package org.ros.chatto.controller;
 import java.security.Principal;
 import java.time.Instant;
 import java.util.List;
+import java.util.Optional;
 
 import javax.validation.Valid;
 
@@ -13,6 +14,7 @@ import org.ros.chatto.dto.ChatMessageDTO;
 import org.ros.chatto.dto.ReencryptionDTO;
 import org.ros.chatto.service.AdminService;
 import org.ros.chatto.service.ChatService;
+import org.ros.chatto.service.UserDTOSpec;
 import org.ros.chatto.service.UserService;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -22,6 +24,7 @@ import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import lombok.RequiredArgsConstructor;
@@ -62,14 +65,21 @@ public class AdminRESTController {
 		return chatMessageDTOs;
 	}
 
-	@GetMapping("/regular-users")
-	public List<String> getAllRegularUsers() {
-		return userService.getAllRegularUsers();
-	}
-
 	@GetMapping("/get/users")
-	public List<AdminUserDTO> getAllOtherUsers(Principal principal) {
-		return adminService.getOtherUsers(principal.getName());
+	public List<AdminUserDTO> getUsers(Principal principal,
+			@RequestParam Optional<String> select) {
+		if (select.isPresent()) {
+			switch (select.get()) {
+			case "all":
+				return adminService.getUsers("", UserDTOSpec.ALL_USERS);
+
+			case "regular":
+				return adminService.getUsers("", UserDTOSpec.REGULAR_USERS);
+
+			}
+		}
+		return adminService.getUsers(principal.getName(),
+				UserDTOSpec.OTHER_USERS);
 	}
 
 	@DeleteMapping("/delete/users/{userName}")

src/main/java/org/ros/chatto/repository/AdminUserRepository.java

@@ -0,0 +1,25 @@
+package org.ros.chatto.repository;
+
+import java.util.List;
+
+import org.ros.chatto.dto.AdminUserDTO;
+import org.ros.chatto.model.ChatUser;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface AdminUserRepository extends JpaRepository<ChatUser, Long> {
+
+    @Query("select new org.ros.chatto.dto.AdminUserDTO(u.userID, u.userName, ur.role.name, u.joinDate )"
+            + " from ChatUser u join u.userRoles ur where u.userName != ?1")
+    public List<AdminUserDTO> getOtherUsers(String principal);
+
+    @Query("select new org.ros.chatto.dto.AdminUserDTO(u.userID, u.userName, ur.role.name, u.joinDate )"
+            + " from ChatUser u join u.userRoles ur ")
+    public List<AdminUserDTO> getAllUsers();
+
+    @Query("select new org.ros.chatto.dto.AdminUserDTO(u.userID, u.userName, ur.role.name, u.joinDate )"
+            + " from ChatUser u join u.userRoles ur where ur.role.roleID = 2")
+    public List<AdminUserDTO> getRegularUsers();
+}

src/main/java/org/ros/chatto/repository/UserRepository.java

@@ -19,8 +19,4 @@ public interface UserRepository extends JpaRepository<ChatUser, Long> {
 
 	@Query("select count(u) from ChatUser u")
 	public Long totalUsers();
-
-	@Query("select new org.ros.chatto.dto.AdminUserDTO(u.userID, u.userName, ur.role.name, u.joinDate )"
-			+ " from ChatUser u join u.userRoles ur ")
-	public List<AdminUserDTO> getOtherUsers(String principal);
 }

src/main/java/org/ros/chatto/service/AdminService.java

@@ -7,8 +7,10 @@ import com.spencerwi.either.Result;
 
 import org.ros.chatto.dto.AdminUserDTO;
 import org.ros.chatto.model.ChatUser;
+import org.ros.chatto.repository.AdminUserRepository;
 import org.ros.chatto.repository.UserRepository;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -16,11 +18,22 @@ import lombok.extern.slf4j.Slf4j;
 @Service
 @RequiredArgsConstructor
 @Slf4j
+@Transactional
 public class AdminService {
     private final UserRepository userRepository;
+    private final AdminUserRepository adminUserRepository;
 
-    public List<AdminUserDTO> getOtherUsers(String principal) {
-        return userRepository.getOtherUsers(principal);
+    public List<AdminUserDTO> getUsers(String principal, UserDTOSpec spec) {
+        switch (spec) {
+        case OTHER_USERS:
+            return adminUserRepository.getOtherUsers(principal);
+        case ALL_USERS:
+            return adminUserRepository.getAllUsers();
+        case REGULAR_USERS:
+            return adminUserRepository.getRegularUsers();
+        default:
+            throw new UnsupportedOperationException();
+        }
     }
 
     public Result<Void> deleteUser(String userName) {

src/main/java/org/ros/chatto/service/UserDTOSpec.java

@@ -0,0 +1,5 @@
+package org.ros.chatto.service;
+
+public enum UserDTOSpec {
+    ALL_USERS, OTHER_USERS, REGULAR_USERS
+}