Create leave entity

src/main/java/seedu/address/model/person/Leave.java

@@ -0,0 +1,75 @@
+package seedu.address.model.person;
+
+import static java.util.Objects.requireNonNull;
+import static seedu.address.commons.util.AppUtil.checkArgument;
+
+/**
+ * Represents a Person's leave.
+ */
+public class Leave {
+    public static final int LEAVE_LENGTH = 12;
+    public static final String MESSAGE_CONSTRAINTS = "Invalid leave format";
+
+    public final String leave;
+
+    /**
+     * Constructs an empty {@code Leave}.
+     */
+    public Leave() {
+        this.leave = "000000000000";
+    }
+
+    /**
+     * Constructs a {@code Leave}.
+     *
+     * @param leave A valid leave.
+     */
+    public Leave(String leave) {
+        requireNonNull(leave);
+        leave = leave.trim();
+        checkArgument(isValidLeave(leave), MESSAGE_CONSTRAINTS);
+        this.leave = leave;
+    }
+
+    /**
+     * Returns true if a given string is a valid leave.
+     */
+    public static boolean isValidLeave(String test) {
+        test = test.trim();
+        if (test.length() != LEAVE_LENGTH) {
+            return false;
+        }
+        for (int i = 0; i < LEAVE_LENGTH; i++) {
+            if (test.charAt(i) != '0' || test.charAt(i) != '1') {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return leave;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other == this) {
+            return true;
+        }
+
+        // instanceof handles nulls
+        if (!(other instanceof Leave)) {
+            return false;
+        }
+
+        Leave otherLeave = (Leave) other;
+        return leave.equals(otherLeave.leave);
+    }
+
+    @Override
+    public int hashCode() {
+        return leave.hashCode();
+    }
+
+}

src/main/java/seedu/address/model/person/Person.java

@@ -27,6 +27,7 @@ public class Person {
     private final Money claimBudget;
     private final Department department;
     private final Birthday dob;
+    private final Leave leave;
     private final Set<Tag> tags = new HashSet<>();
 
     /**
@@ -43,6 +44,21 @@ public Person(Name name, Phone phone, Email email, Address address,
         this.claimBudget = claimBudget;
         this.department = dep;
         this.dob = dob;
+        this.leave = new Leave();
+    }
+
+    public Person(Name name, Phone phone, Email email, Address address,
+            Money salary, Money claimBudget, Department dep, Birthday dob, Leave leave) {
+        requireAllNonNull(name, phone, email, address, salary, claimBudget, dep, dob);
+        this.name = name;
+        this.phone = phone;
+        this.email = email;
+        this.address = address;
+        this.salary = salary;
+        this.claimBudget = claimBudget;
+        this.department = dep;
+        this.dob = dob;
+        this.leave = leave;
     }
 
     public Name getName() {
@@ -77,6 +93,10 @@ public Birthday getDob() {
         return dob;
     }
 
+    public Leave getLeave() {
+        return leave;
+    }
+
     /**
      * Returns an immutable tag set, which throws {@code UnsupportedOperationException}
      * if modification is attempted.
@@ -123,7 +143,7 @@ public boolean equals(Object other) {
     @Override
     public int hashCode() {
         // use this method for custom fields hashing instead of implementing your own
-        return Objects.hash(name, phone, email, address, salary, claimBudget, department, dob);
+        return Objects.hash(name, phone, email, address, salary, claimBudget, department, dob, leave);
     }
 
     @Override
@@ -137,6 +157,7 @@ public String toString() {
                 .add("claimBudget", claimBudget)
                 .add("department", department)
                 .add("dob", dob)
+                .add("leave", leave)
                 .toString();
     }