| package @sharedPackage; |
| |
| /** |
| * <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; |
| } |
| } |