Complete A-CodeQuality

src/main/java/commands/AddCommand.java

@@ -51,18 +51,16 @@ public AddCommand(String description, LocalDateTime startDate, LocalDateTime end
      *
      * @param tasks          The task list where the task will be added.
      * @param storageManager The storage manager to save the changes.
-     * @return The added task.
+     * @return String print output.
      */
     public String execute(TaskList tasks, StorageManager storageManager) {
         task.setStatus(status);
         tasks.add(task);
         storageManager.save(tasks);
-
         StringBuilder output = new StringBuilder();
         output.append("Got it. I've added this task:\n");
         output.append(task).append("\n");
         output.append(String.format("Now you have %d tasks in the list.\n", tasks.getSize()));
-
         return output.toString();
     }
 

src/main/java/commands/ByeCommand.java

@@ -12,7 +12,7 @@ public class ByeCommand extends Command {
      *
      * @param tasks          The task list (not used in this command).
      * @param storageManager The storage manager (not used in this command).
-     * @return Null, as there is no task to return.
+     * @return String print output.
      */
     public String execute(TaskList tasks, StorageManager storageManager) {
         return ("Bye. Hope to see you again soon!");

src/main/java/commands/Command.java

@@ -13,7 +13,7 @@ public abstract class Command {
      *
      * @param tasks          the taskList
      * @param storageManager to load and save tasks
-     * @return Task handled by the command
+     * @return String print output.
      * @throws CalException if there was an error when executing the command.
      */
     public abstract String execute(TaskList tasks, StorageManager storageManager) throws CalException;

src/main/java/commands/DeleteCommand.java

@@ -25,20 +25,17 @@ public DeleteCommand(int taskNum) {
      *
      * @param tasks          The task list where the task will be deleted.
      * @param storageManager The storage manager to save the changes.
-     * @return The deleted task.
+     * @return String print output.
      */
     public String execute(TaskList tasks, StorageManager storageManager) {
         Task t = tasks.delete(taskNum);
         storageManager.save(tasks);
-
         StringBuilder output = new StringBuilder();
         output.append("Noted. I've removed this task\n");
         output.append(t).append("\n");
         output.append(String.format("Now you have %d tasks in the list.\n", tasks.getSize()));
-
         return output.toString();
     }
-
 
     /**
      * Indicates whether the DeleteCommand is an exit command.

src/main/java/commands/FindCommand.java

@@ -27,7 +27,7 @@ public FindCommand(String keyword) {
      *
      * @param tasks The task list to search through
      * @param storageManager The storage manager (not used in this command).
-     * @return Null, as there is no task to return.
+     * @return String print output.
      */
     public String execute(TaskList tasks, StorageManager storageManager) {
         StringBuilder output = new StringBuilder();

src/main/java/commands/ListCommand.java

@@ -13,7 +13,7 @@ public class ListCommand extends Command {
      *
      * @param tasks          The task list to be displayed.
      * @param storageManager The storage manager (not used in this command).
-     * @return Null, as there is no task to return.
+     * @return String print output.
      */
     public String execute(TaskList tasks, StorageManager storageManager) {
         StringBuilder output = new StringBuilder();
@@ -28,7 +28,6 @@ public String execute(TaskList tasks, StorageManager storageManager) {
         }
         return output.toString();
     }
-
 
     /**
      * Indicates whether the ListCommand is an exit command.

src/main/java/commands/MarkCommand.java

@@ -26,20 +26,17 @@ public MarkCommand(int taskNum) {
      *
      * @param tasks          The task list containing the task.
      * @param storageManager The storage manager to save the changes.
-     * @return The task that has been marked as done.
+     * @return String print output.
      * @throws CalException if the task number is invalid or if an error occurs.
      */
     public String execute(TaskList tasks, StorageManager storageManager) throws CalException {
         Task t = tasks.mark(taskNum);
         storageManager.save(tasks);
-
         StringBuilder output = new StringBuilder();
         output.append("Nice! I've marked this task as done:\n");
         output.append(t).append("\n");
-
         return output.toString();
     }
-
 
     /**
      * Indicates whether the MarkCommand is an exit command.

src/main/java/commands/UnmarkCommand.java

@@ -27,20 +27,17 @@ public UnmarkCommand(int taskNum) {
      *
      * @param tasks          The task list containing the task.
      * @param storageManager The storage manager to save the changes.
-     * @return The task that has been unmarked.
+     * @return String print output.
      * @throws CalException if the task number is invalid or if an error occurs.
      */
     public String execute(TaskList tasks, StorageManager storageManager) throws CalException {
         Task t = tasks.unmark(taskNum);
         storageManager.save(tasks);
-
         StringBuilder output = new StringBuilder();
         output.append("OK, I've marked this task as not done yet:\n");
         output.append(t).append("\n");
-
         return output.toString();
     }
-
 
     /**
      * Indicates whether the UnmarkCommand is an exit command.

src/main/java/controller/DialogBox.java

@@ -16,8 +16,8 @@
 
 /**
  * An example of a custom control using FXML.
- * This control represents a dialog box consisting of an ImageView to represent the speaker's face and a label
- * containing text from the speaker.
+ * represents a dialog box consisting of an ImageView to represent user profile picture and a label
+ * containing dialog text.
  */
 public class DialogBox extends HBox {
     @FXML
@@ -36,8 +36,8 @@ private DialogBox(String text, Image img, String backgroundColor) {
         }
         dialog.setText(text);
         displayPicture.setImage(img);
-        dialog.setStyle("-fx-background-color: " + backgroundColor 
-                + "; -fx-background-radius: 10; " + "-fx-label-padding: 10;"); 
+        dialog.setStyle("-fx-background-color: " + backgroundColor
+                + "; -fx-background-radius: 10; " + "-fx-label-padding: 10;");
     }
 
     /**

src/main/java/controller/MainWindow.java

@@ -12,7 +12,8 @@
 import javafx.scene.layout.VBox;
 
 /**
- * The main view for the application.
+ * represents the main view for the application consisting of chat window,
+ * text field and send button.
  */
 public class MainWindow {
     @FXML

src/main/java/parser/Parser.java

@@ -18,6 +18,18 @@
  * contains a static method 'parseCommand' which takes a user input string and returns the appropriate Command object.
  */
 public class Parser {
+    public static void checkNullTaskNum(int inputLen) throws CalException {
+        if (inputLen < 2) {
+            throw new CalException("Task number not provided!");
+        }
+    }
+
+    public static void checkBlankField(String field, String fieldName) throws CalException {
+        if (field.isBlank()) {
+            throw new CalException("Oops! You are missing" + fieldName + ".");
+        }
+    }
+
     /**
      * Parses the user input string and returns the corresponding Command object.
      *
@@ -40,38 +52,24 @@ public static Command parseCommand(String line) throws CalException {
         case "list":
             return new ListCommand();
         case "mark":
-            if (tokens.length < 2) {
-                throw new CalException("Task number not provided!");
-            }
-
+            checkNullTaskNum(tokens.length);
             return new MarkCommand(Integer.parseInt(tokens[1]));
         case "unmark":
-            if (tokens.length < 2) {
-                throw new CalException("Task number not provided!");
-            }
-
+            checkNullTaskNum(tokens.length);
             return new UnmarkCommand(Integer.parseInt(tokens[1]));
         case "todo":
             description = line.substring(4).strip();
-            if (description.isBlank()) {
-                throw new CalException("Task description not provided");
-            }
-
+            checkBlankField(description, "description");
             return new AddCommand(description);
         case "deadline":
             int byIndex = line.indexOf("/by");
             LocalDateTime dueDate;
 
             try {
                 description = line.substring(8, byIndex).strip();
-                if (description.isBlank()) {
-                    throw new CalException("Task description not provided");
-                }
-
+                checkBlankField(description, "description");
                 String by = line.substring(byIndex + 4).strip();
-                if (by.isBlank()) {
-                    throw new CalException("Task due date not provided");
-                }
+                checkBlankField(by, "due date");
                 dueDate = LocalDateTime.parse(by, Task.INPUT_DATE_FORMAT);
             } catch (StringIndexOutOfBoundsException e) {
                 throw new CalException("Deadline Task is not in the format: "
@@ -89,20 +87,12 @@ public static Command parseCommand(String line) throws CalException {
 
             try {
                 description = line.substring(5, fromIndex).strip();
-                if (description.isBlank()) {
-                    throw new CalException("Event description not provided");
-                }
-
+                checkBlankField(description, "description");
                 String startDateStr = line.substring(fromIndex + 5, toIndex).strip();
-                if (startDateStr.isBlank()) {
-                    throw new CalException("Event start date not provided");
-                }
+                checkBlankField(startDateStr, "start date");
                 startDate = LocalDateTime.parse(startDateStr, Task.INPUT_DATE_FORMAT);
-
                 String endDateStr = line.substring(toIndex + 3).strip();
-                if (endDateStr.isBlank()) {
-                    throw new CalException("Event end date not provided");
-                }
+                checkBlankField(endDateStr, "end date");
                 endDate = LocalDateTime.parse(endDateStr, Task.INPUT_DATE_FORMAT);
             } catch (StringIndexOutOfBoundsException e) {
                 throw new CalException("Event Task is not in the format: "
@@ -113,16 +103,11 @@ public static Command parseCommand(String line) throws CalException {
 
             return new AddCommand(description, startDate, endDate);
         case "delete":
-            if (tokens.length < 2) {
-                throw new CalException("Task number not provided!");
-            }
-
+            checkNullTaskNum(tokens.length);
             return new DeleteCommand(Integer.parseInt(tokens[1]));
         case "find":
             String keyword = line.substring(4).strip();
-            if (keyword.isBlank()) {
-                throw new CalException("Missing search keyword.");
-            }
+            checkBlankField(keyword, "search keyword");
             return new FindCommand(keyword);
         default:
             throw new CalException("Command not recognized.");

src/main/java/storage/TaskSerializer.java

@@ -22,7 +22,6 @@ public class TaskSerializer {
      */
     public static String serialize(Task t) {
         assert t != null : "Task should not be null";
-
         String[] taskFields = {"", "", "", "", ""};
         taskFields[1] = t.getStatus() ? "1" : "0";
         taskFields[2] = t.getDescription();