Add Recruiter Type

Add RECRUITER to Type enum.

Parse recruiter type contacts in JSON.

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

@@ -23,6 +23,11 @@ public boolean hasOrganisation() {
         return true;
     }
 
+    @Override
+    public Type getType() {
+        return Type.RECRUITER;
+    }
+
     // TODO: Append orgID to string.
     @Override
     public String toString() {

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

@@ -7,6 +7,7 @@
  */
 public enum Type {
     ORGANIZATION("organization"),
+    RECRUITER("recruiter"),
     UNKNOWN("unknown");
 
 

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

@@ -16,7 +16,7 @@ public class Url {
      * The first character of the url must not be a whitespace,
      * otherwise " " (a blank string) becomes a valid input.
      */
-    public static final String VALIDATION_REGEX = ".+\\..+";
+    public static final String VALIDATION_REGEX = "(.+\\..+|)";
 
     public final String value;
 

src/main/java/seedu/address/storage/JsonAdaptedContact.java

@@ -18,6 +18,7 @@
 import seedu.address.model.person.Organization;
 import seedu.address.model.person.Phone;
 import seedu.address.model.person.Position;
+import seedu.address.model.person.Recruiter;
 import seedu.address.model.person.Status;
 import seedu.address.model.person.Type;
 import seedu.address.model.person.Url;
@@ -73,6 +74,9 @@ public JsonAdaptedContact(Contact source) {
         if (source.getType() == Type.ORGANIZATION) {
             status = ((Organization) source).getStatus().applicationStatus;
             position = ((Organization) source).getPosition().jobPosition;
+        } else if (source.getType() == Type.RECRUITER) {
+            status = "";
+            position = "";
         }
 
         type = source.getType().toString();
@@ -138,7 +142,7 @@ public Contact toModelType() throws IllegalValueException {
             throw new IllegalValueException(String.format(MISSING_FIELD_MESSAGE_FORMAT, Url.class.getSimpleName()));
         }
         if (!Url.isValidUrl(url)) {
-            throw new IllegalValueException(Id.MESSAGE_CONSTRAINTS);
+            throw new IllegalValueException(Url.MESSAGE_CONSTRAINTS);
         }
         final Url modelUrl = new Url(url);
 
@@ -164,6 +168,12 @@ public Contact toModelType() throws IllegalValueException {
                     modelTags, modelStatus, modelPosition
             );
         }
+        case RECRUITER: {
+            return new Recruiter(
+                    modelName, modelId, modelPhone, modelEmail, modelUrl, modelAddress,
+                    modelTags
+            );
+        }
         default:
             return new Contact(modelName, modelId, modelPhone, modelEmail, modelUrl, modelAddress, modelTags);
         }