Merge remote-tracking branch 'origin/15-userdatabase-and-user' into 15-userdatabase-and-user

Author: Madhavan7

src/main/java/UserDatabase.java

@@ -1,6 +1,6 @@
 import java.io.*;
 import java.util.Scanner;
-public class UserDatabase implements UserExists, UserCreator{
+public class UserDatabase implements UserExists, UserRetriever, UserCreator{
     File accounts;
     public UserDatabase(File accounts){
         this.accounts = accounts;
@@ -43,4 +43,25 @@ public void createUser(String username, String password, String email, String ty
             System.out.println("Error");
         }
     }
+
+    @Override
+//  To be edited to get user from the array format rather than the serialized format.
+    public User getUser(String username) {
+        User user = null;
+        try(FileInputStream fileIn = new FileInputStream(accounts);
+            ObjectInputStream in = new ObjectInputStream(fileIn)){
+            do{
+                try{
+                    user = (User)in.readObject();
+                }catch(NullPointerException e){
+                    break;
+                }
+            }while(!user.getUsername().equals(username));
+        }catch(IOException e){
+            e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+        return user;
+    }
 }

src/main/java/UserRetriever.java

@@ -0,0 +1,3 @@
+public interface UserRetriever {
+    User getUser(String username);
+}

src/test/java/UserDatabaseTest.java

@@ -30,4 +30,4 @@ public void rightUserWrongEmail(){
         UserDatabase accountDatabase = new UserDatabase(accounts);
         Assertions.assertTrue(accountDatabase.UserExists("MeenakshiGopakumar", "ma"));
     }
-}
+    }