Mercurial > dive4elements > river
comparison flys-client/src/main/java/de/intevation/flys/client/shared/FieldVerifier.java @ 0:4e8be5e7855f
Start of a GWT based client for FLYS-3.0
flys-client/trunk@1305 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Tue, 08 Feb 2011 10:29:49 +0000 |
| parents | |
| children | ba1b27b7d282 |
comparison
equal
deleted
inserted
replaced
| -1:000000000000 | 0:4e8be5e7855f |
|---|---|
| 1 package de.intevation.flys.client.shared; | |
| 2 | |
| 3 /** | |
| 4 * <p> | |
| 5 * FieldVerifier validates that the name the user enters is valid. | |
| 6 * </p> | |
| 7 * <p> | |
| 8 * This class is in the <code>shared</code> package because we use it in both | |
| 9 * the client code and on the server. On the client, we verify that the name is | |
| 10 * valid before sending an RPC request so the user doesn't have to wait for a | |
| 11 * network round trip to get feedback. On the server, we verify that the name is | |
| 12 * correct to ensure that the input is correct regardless of where the RPC | |
| 13 * originates. | |
| 14 * </p> | |
| 15 * <p> | |
| 16 * When creating a class that is used on both the client and the server, be sure | |
| 17 * that all code is translatable and does not use native JavaScript. Code that | |
| 18 * is note translatable (such as code that interacts with a database or the file | |
| 19 * system) cannot be compiled into client side JavaScript. Code that uses native | |
| 20 * JavaScript (such as Widgets) cannot be run on the server. | |
| 21 * </p> | |
| 22 */ | |
| 23 public class FieldVerifier { | |
| 24 | |
| 25 /** | |
| 26 * Verifies that the specified name is valid for our service. | |
| 27 * | |
| 28 * In this example, we only require that the name is at least four | |
| 29 * characters. In your application, you can use more complex checks to ensure | |
| 30 * that usernames, passwords, email addresses, URLs, and other fields have the | |
| 31 * proper syntax. | |
| 32 * | |
| 33 * @param name the name to validate | |
| 34 * @return true if valid, false if invalid | |
| 35 */ | |
| 36 public static boolean isValidName(String name) { | |
| 37 if (name == null) { | |
| 38 return false; | |
| 39 } | |
| 40 return name.length() > 3; | |
| 41 } | |
| 42 } |