Added a validation helper for future use.

src/main/java/ca/bcit/infosys/comp4911/helper/ValidationHelper.java

@@ -0,0 +1,33 @@
+package ca.bcit.infosys.comp4911.helper;
+
+import org.json.JSONArray;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.Validation;
+import javax.validation.Validator;
+import javax.validation.ValidatorFactory;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.Response;
+import java.util.Set;
+
+/**
+ * Validation Helper
+ */
+public class ValidationHelper {
+
+    private static ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
+
+    public static Validator getValidator() {
+        return factory.getValidator();
+    }
+
+    public static boolean validateEntity(Object object){
+        Set<ConstraintViolation<Object>> constraintViolations = ValidationHelper.getValidator().validate(object);
+        if (constraintViolations.size() > 0) {
+            JSONArray jsonArray = new JSONArray(constraintViolations.toArray());
+            throw new WebApplicationException(Response.status(Response.Status.BAD_REQUEST).entity(jsonArray.toString()).build());
+        }
+
+        return true;
+    }
+}