Mercurial > dive4elements > river
diff 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> |
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date | Tue, 08 Feb 2011 10:29:49 +0000 |
parents | |
children | ba1b27b7d282 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/de/intevation/flys/client/shared/FieldVerifier.java Tue Feb 08 10:29:49 2011 +0000 @@ -0,0 +1,42 @@ +package de.intevation.flys.client.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 note 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; + } +}