/*
* Copyright 2013, Cristiano Costantini, Giuseppe Gerla, Michele Ficarra, Sergio Ciampi, Stefano
* Cigheri.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.developers.gdgfirenze.gwt.shared;
/**
* <p>
* FieldVerifier validates that the name the user enters is valid.
* </p>
* <p>
* This class is in the <code>shared</code> package because we use it in both the client code and on
* the server. On the client, we verify that the name is valid before sending an RPC request so the
* user doesn't have to wait for a network round trip to get feedback. On the server, we verify that
* the name is correct to ensure that the input is correct regardless of where the RPC originates.
* </p>
* <p>
* When creating a class that is used on both the client and the server, be sure that all code is
* translatable and does not use native JavaScript. Code that is not translatable (such as code that
* interacts with a database or the file system) cannot be compiled into client side JavaScript.
* Code that uses native JavaScript (such as Widgets) cannot be run on the server.
* </p>
*/
public class FieldVerifier {
/**
* Verifies that the specified name is valid for our service.
*
* In this example, we only require that the name is at least four characters. In your
* application, you can use more complex checks to ensure that usernames, passwords, email
* addresses, URLs, and other fields have the proper syntax.
*
* @param name the name to validate
* @return true if valid, false if invalid
*/
public static boolean isValidName(String name) {
if (name == null) {
return false;
}
return name.length() > 3;
}
}