ch.unifr.pai.twice.authentication.client.Authentication.java Source code

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Here is the source code for ch.unifr.pai.twice.authentication.client.Authentication.java

Source

package ch.unifr.pai.twice.authentication.client;

/*
 * Copyright 2013 Oliver Schmid
 * 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.
 */

import com.google.gwt.user.client.Window;

/**
 * A simple implementation of an authentication module used to gather the user name of a participant. This implementation asks the user for his/her name through
 * a standard prompt and stores the value in a static variable (valid for a client session).
 * 
 * Improved implementations can introduce the confirmation of user credentials (e.g. password, etc.) as well as connect to further information sources to gather
 * data about a user from external services (e.g. Google+, Facebook, etc.)
 * 
 * @author Oliver Schmid
 * 
 */
public class Authentication {

    private static String username;

    /**
     * Returns the user name for the identification and the signature of triggered messages within the collaborative session
     * 
     * @return the user name
     */
    public static String getUserName() {
        if (username == null) {
            String s = Window.prompt("What's your name?", "");
            if ((s != null) && !s.isEmpty()) {
                username = s;
            }
        }
        return username;
    }

}