FieldVerifier.java

/*
 * Copyright 2016 ArcBees Inc.
 *
 * 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.gwtplatform.samples.multimodule.module1.shared;

/**
 * <p> FieldVerifier validates that the name the user enters is valid. </p> <p> This class is in the <code>shared</code>
 * packing 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.
     * <p/>
     * 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) {
        return name != null && name.length() > 3;
    }
}