Construct the basic structure for "add reservation", "mark reservatio…

…n", "void reservation", "list reservations", "list served reservations", "list unserved reservations".

src/main/java/seedu/duke/Ui.java

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+package seedu.duke;
+
+/** Deals with interactions with the user. */
+public class Ui {
+
+}

src/main/java/seedu/duke/commands/AddReservationCommand.java

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+package seedu.duke.commands;
+
+import seedu.duke.reservation.Reservation;
+import seedu.duke.reservation.ReservationList;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+
+import static seedu.duke.utils.Constants.*;
+
+/* Command object for "add reservation" command */
+public class AddReservationCommand extends ReservationCommand{
+    private int reservationNumber;
+    private String description;
+
+    public AddReservationCommand(int reservationNumber, String description) {
+        this.reservationNumber = reservationNumber;
+        this.description = description;
+    }
+
+    /**
+     * Adds a reservation into the list.
+     * 
+     * @param reservations Existing reservation list.
+     */
+    @Override
+    public void execute(ReservationList reservations) {
+        // TODO: may have delimiter missing exception
+        // name
+        int namePos = description.indexOf(RES_PERSON_MARKER);
+        int nameEndPos = description.indexOf(DELIMITER, namePos); 
+        String name = description.substring(namePos + RES_PERSON_MARKER.length(), nameEndPos + 1).trim();
+
+        // date
+        int datePos = description.indexOf(RES_DATE_MARKER);
+        int dateEndPos = description.indexOf(DELIMITER, datePos);
+        LocalDate date = LocalDate.parse(description.substring(datePos + RES_DATE_MARKER.length(), dateEndPos + 1).trim(), 
+                DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"));
+
+        // numberOfGuests
+        int numberPos = description.indexOf(RES_NUM_MARKER);
+        int numberEndPos = description.indexOf(DELIMITER, numberPos);
+        int numberOfGuests = Integer.parseInt(description.substring(numberPos + RES_NUM_MARKER.length(), numberEndPos + 1).trim());
+
+        // contact
+        int contactPos = description.indexOf(RES_CONTACT_MARKER);
+        int contactEndPos = description.indexOf(DELIMITER, contactPos);
+        String contact = description.substring(contactPos + RES_CONTACT_MARKER.length(), contactEndPos + 1).trim();
+
+        // comments
+        int commentsPos = description.indexOf(RES_COMMENT_MARKER);
+        int commentsEndPos = description.indexOf(DELIMITER, commentsPos);
+        String comments = description.substring(commentsPos + RES_COMMENT_MARKER.length(), commentsEndPos + 1).trim();
+
+        // reservationNumber
+        int reservationNumber = reservations.getSize();
+
+        Reservation reservation = new Reservation(reservationNumber, name, date, numberOfGuests, contact);
+        reservations.addReservation(reservation);
+
+        // TODO: display some message
+    }
+}

src/main/java/seedu/duke/commands/ListReservationCommand.java

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+package seedu.duke.commands;
+
+import seedu.duke.reservation.ReservationList;
+
+/* Command object for "list reservations" command */
+public class ListReservationCommand extends ReservationCommand {
+    /**
+     * Lists all reservations, including served, unserved, and invalid reservations.
+     * 
+     * @param reservations Existing reservation list.
+     */
+    @Override
+    public void execute(ReservationList reservations) {
+        // TODO: wrap it into Ui class
+        for (int i = 1; i <= reservations.getSize(); i++) {
+            System.out.println(reservations.getReservation(i));
+        }
+    }
+}

src/main/java/seedu/duke/commands/ListServedCommand.java

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+package seedu.duke.commands;
+
+import seedu.duke.reservation.ReservationList;
+
+import static seedu.duke.utils.Constants.SERVED;
+
+/* Command object for "list served reservations" command */
+public class ListServedCommand extends ReservationCommand {
+    /**
+     * Lists all served reservations.
+     * 
+     * @param reservations Existing reservation list.
+     */
+    @Override
+    public void execute(ReservationList reservations) {
+        // TODO: wrap it into Ui class
+        for (int i = 1; i <= reservations.getSize(); i++) {
+            if (!reservations.getReservation(i).getStatus().equals(SERVED)) {
+                continue;
+            }
+
+            System.out.println(reservations.getReservation(i));
+        }
+    }
+}

src/main/java/seedu/duke/commands/ListUnservedCommand.java

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+package seedu.duke.commands;
+
+import seedu.duke.reservation.ReservationList;
+
+import static seedu.duke.utils.Constants.NOT_SERVED;
+
+/* Command object for "list unserved reservations" command */
+public class ListUnservedCommand extends ReservationCommand {
+    /**
+     * Lists all unserved reservations.
+     * 
+     * @param reservations Existing reservation list.
+     */
+    @Override
+    public void execute(ReservationList reservations) {
+        // TODO: wrap it into Ui class
+        for (int i = 1; i <= reservations.getSize(); i++) {
+            if (!reservations.getReservation(i).getStatus().equals(NOT_SERVED)) {
+                continue;
+            }
+
+            System.out.println(reservations.getReservation(i));
+        }
+    }
+}

src/main/java/seedu/duke/commands/MarkReservationCommand.java

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+package seedu.duke.commands;
+
+import seedu.duke.reservation.ReservationList;
+
+import static seedu.duke.utils.Constants.DELIMITER;
+import static seedu.duke.utils.Constants.RES_INDEX_MARKER;
+
+/* Command object for "mark reservation" command */
+public class MarkReservationCommand extends ReservationCommand {
+    private String description;
+
+    public MarkReservationCommand(String description) {
+        this.description = description;
+    }
+
+    /**
+     * Specifies the index number of the target reservations.
+     * Marks the reservation as done.
+     * 
+     * @param reservations Existing reservation list.
+     */
+    @Override
+    public void execute(ReservationList reservations) {
+        // specifies the reservation number
+        int numberPos = description.indexOf(RES_INDEX_MARKER);
+        int numberEndPos = description.indexOf(DELIMITER, numberPos);
+        int reservationNumber = Integer.parseInt(description.substring(numberPos + RES_INDEX_MARKER.length(),
+                numberEndPos + 1).trim());
+
+        // mark the reservation as done
+        reservations.markReservationAsServed(reservationNumber);
+    }
+}

src/main/java/seedu/duke/commands/ReservationCommand.java

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+package seedu.duke.commands;
+
+import seedu.duke.reservation.ReservationList;
+
+public abstract class ReservationCommand {
+    public abstract void execute(ReservationList reservations);
+}

src/main/java/seedu/duke/commands/VoidReservationCommand.java

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+package seedu.duke.commands;
+
+import seedu.duke.reservation.ReservationList;
+
+import static seedu.duke.utils.Constants.DELIMITER;
+import static seedu.duke.utils.Constants.RES_INDEX_MARKER;
+
+/* Command object for "void reservation" command */
+public class VoidReservationCommand extends ReservationCommand {
+    private String description;
+
+    public VoidReservationCommand(String description) {
+        this.description = description;
+    }
+
+    /**
+     * Specifies the index number of the target reservations.
+     * Marks the reservation as invalid in the case like reservation cancellation and etc.
+     * 
+     * @param reservations Existing reservation list.
+     */
+    @Override
+    public void execute(ReservationList reservations) {
+        // specifies the reservation number
+        int numberPos = description.indexOf(RES_INDEX_MARKER);
+        int numberEndPos = description.indexOf(DELIMITER, numberPos);
+        int reservationNumber = Integer.parseInt(description.substring(numberPos + RES_INDEX_MARKER.length(),
+                numberEndPos + 1).trim());
+
+        // voids the reservation
+        reservations.voidReservation(reservationNumber);
+    }
+}