Add parseContactId method

src/main/java/seedu/address/logic/parser/ParserUtil.java

@@ -10,6 +10,7 @@
 import seedu.address.commons.util.StringUtil;
 import seedu.address.logic.parser.exceptions.ParseException;
 import seedu.address.model.person.Address;
+import seedu.address.model.person.ContactId;
 import seedu.address.model.person.Email;
 import seedu.address.model.person.Name;
 import seedu.address.model.person.Phone;
@@ -95,6 +96,21 @@ public static Email parseEmail(String email) throws ParseException {
         return new Email(trimmedEmail);
     }
 
+    /**
+     * Parses a {@code String contactId} into an {@code ContactId}.
+     * Leading and trailing whitespaces will be trimmed.
+     *
+     * @throws ParseException if the given {@code contactId} is invalid.
+     */
+    public static ContactId parseContactId(String contactId) throws ParseException {
+        requireNonNull(contactId);
+        String trimmedId = contactId.trim();
+        if (ContactId.isValidId(trimmedId)) {
+            throw new ParseException(ContactId.MESSAGE_CONSTRAINTS);
+        }
+        return new ContactId(trimmedId);
+    }
+
     /**
      * Parses a {@code String tag} into a {@code Tag}.
      * Leading and trailing whitespaces will be trimmed.