TP

Question 1

The 4 components that does a bulk of the app’s work

Answer 1

1. UI
2. Logic
3. Model
4. Storage

Question 2

What does the UI component do?

Answer 2

The UI component enables users to interact with the application by presenting information visually, capturing user input, and facilitating navigation and feedback within the software.

Question 3

What does the Logic component do?

Answer 3

The command executor is a component that interprets and executes user commands, managing the interaction between the user interface and the application’s logic to perform desired actions based on user input.

Question 4

What does the Model component do?

Answer 4

The Model component is responsible for storing and managing the application’s data in memory, enabling other components to access and manipulate this data during the application’s operation.

Question 5

What does the Storage component do?

Answer 5

The Storage component is responsible for reading data from and writing data to the hard disk, ensuring that the application’s data persists between sessions.

Question 6

Where is the functionality for each component defined?

Answer 6

Each of the main 4 components defines its API in an interface with the same name as the component. The functionality is in a concrete {ComponentName}Manager class which follows the corresponding API interface.

Question 7

All UI components inherit from which abstract class?

Answer 7

UiPart

Question 8

Which class does the UI component use to execute user commands with?

Answer 8

Logic

Question 9

Which class does the UI component listen for changes to so that the UI can be updated with the modified data?

Answer 9

Model

Question 10

Which class does the UI component keep a reference to?

Answer 10

Logic, in order to execute commands

Question 11

Does the UI component depend on some classes in the Model component?

Answer 11

Yes, as it displays Person object residing in the Model

Question 12

How does the Logic component work?

Answer 12

1. When Logic is called upon to execute a command, it is passed to an AddressBookParser object which in turn creates a parser that matches the command and uses it to parse the command.
2. This results in a Command object (more precisely, an object of one of its subclasses ie. DeleteCommand) which is executed by LogicManager.
3. The command can communicate with the Model when it is executed (eg. to delete a person). This can take several steps
4. The result of the command execution is encapsulated as a CommandResult object which is returned back from Logic

Question 13

How does parsing work?

Answer 13

When called to parse a user command, the AddressBookParser class creates an XYZCommandParser which uses classes like CliSyntax etc to parse the user command and create a XYZCommand object, which the AddressBookParser returns as a Command object

Question 14

What does the Model component store?

Answer 14

1. The address book data ie. all Person objects (which are contained in a UniquePersonList object)
2. The currently ‘selected’ Person objects (eg. results of a search query) as a separate filtered list which is exposed to outsiders as an unmodifiable ObservableList<Person> that can be 'observed' eg. the UI can be bound to this list so that the UI automatically updates when the data in the list changes.</Person>
3. UserPref that represents the user’s preferences. This is exposed to the outside as a “ReadOnlyUserPref” object

Question 15

Does the Model depend on any of the 3 components?

Answer 15

No, as the Model represents data entities of the domain, they should make sense on their own without depending on other components)

Question 16

How is Tag stored?

Answer 16

There is a Tag list in AddressBook, which contains Tags, which Person references. This allows AddressBook to only require one Tag object per unique tag, instead of each Person needing their own Tag object.

Question 17

What 2 things does the Storage component deal with?

Answer 17

1. Address Book data
2. User Preference data

Question 18

How does Storage deal with AB data and UP data?

Answer 18

It converts them into JSON and stores them on the hard disk. When the app runs, it retrieves the saved JSON data and converts it back to objects that the program can use ie. AddressBook and UserPreference

Question 19

What does the Storage component inherit from?

Answer 19

Inherits from both AddressBookStorage and UserPrefStorage, which means it can be treated as either one.

Question 20

What does the Storage component depend on?

Answer 20

Depends on some classes in the Model component (because the Storage component’s job is to save/retrieve objects that belong to the Model)