Java tutorial
/******************************************************************************* * * 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 org.spiffyui.spiffyauthnode.client; import org.spiffyui.client.JSONUtil; import org.spiffyui.client.JSUtil; import org.spiffyui.client.MainFooter; import org.spiffyui.client.MainHeader; import org.spiffyui.client.MessageUtil; import org.spiffyui.client.rest.RESTCallback; import org.spiffyui.client.rest.RESTException; import org.spiffyui.client.rest.RESTLoginCallBack; import org.spiffyui.client.rest.RESTObjectCallBack; import org.spiffyui.client.rest.RESTility; import org.spiffyui.client.widgets.LongMessage; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.KeyCodes; import com.google.gwt.event.dom.client.KeyPressEvent; import com.google.gwt.event.dom.client.KeyPressHandler; import com.google.gwt.json.client.JSONObject; import com.google.gwt.json.client.JSONValue; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Anchor; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.HTMLPanel; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.TextBox; /** * This class is the main entry point for our GWT module. */ public class Index implements EntryPoint, ClickHandler, KeyPressHandler { private static final Strings STRINGS = (Strings) GWT.create(Strings.class); private static Index g_index; private TextBox m_text = new TextBox(); private LongMessage m_longMessage = new LongMessage("longMsgPanel"); /** * The Index page constructor */ public Index() { g_index = this; } @Override public void onModuleLoad() { /* This is where we load our module and create our dynamic controls. The MainHeader displays our title bar at the top of our page. */ final MainHeader header = new MainHeader(); header.setHeaderTitle("Hello Spiffy Auth Node!"); Anchor logout = new Anchor("Logout", "#"); logout.getElement().setId("header_logout"); header.setLogout(logout); if (!Index.userLoggedIn()) { logout.setVisible(false); header.setWelcomeString(""); } else { header.setWelcomeString("You are logged in!"); } logout.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { event.preventDefault(); doLogout(); } }); /* The main footer shows our message at the bottom of the page. */ MainFooter footer = new MainFooter(); footer.setFooterString( "SpiffyAuthNode was built with the <a href=\"http://www.spiffyui.org\">Spiffy UI Framework</a>"); /* This HTMLPanel holds most of our content. MainPanel_html was built in the HTMLProps task from MainPanel.html, which allows you to use large passages of html without having to string escape them. */ HTMLPanel panel = new HTMLPanel(STRINGS.MainPanel_html()) { @Override public void onLoad() { super.onLoad(); /* Let's set focus into the text field when the page first loads */ m_text.setFocus(true); } }; RootPanel.get("mainContent").add(panel); /* These dynamic controls add interactivity to our page. */ panel.add(m_longMessage, "longMsg"); panel.add(m_text, "nameField"); final Button button = new Button("Submit"); panel.add(button, "submitButton"); button.addClickHandler(this); m_text.addKeyPressHandler(this); RESTility.addLoginListener(new RESTLoginCallBack() { @Override public void onLoginSuccess() { if (RESTility.getUserToken() == null) { return; } header.setWelcomeString("Welcome " + RESTility.getUsername()); JSUtil.bounce("#" + MainHeader.HEADER_ACTIONS_BLOCK, 5, 500, 30); JSUtil.show("#header_logout", "fast"); } @Override public void loginPrompt() { //do nothing } }); } @Override public void onClick(ClickEvent event) { sendRequest(); } @Override public void onKeyPress(KeyPressEvent event) { /* We want to submit the request if the user pressed enter */ if (event.getNativeEvent().getKeyCode() == KeyCodes.KEY_ENTER) { sendRequest(); } } /** * Send the REST request to the server and read the response back. */ private void sendRequest() { String q = m_text.getValue().trim(); if (q.equals("")) { MessageUtil.showWarning("Please enter your name in the text field.", false); return; } RESTility.callREST("simple/" + q, new RESTCallback() { @Override public void onSuccess(JSONValue val) { showSuccessMessage(val); } @Override public void onError(int statusCode, String errorResponse) { MessageUtil.showError("Error. Status Code: " + statusCode + " " + errorResponse); } @Override public void onError(RESTException e) { MessageUtil.showError(e.getReason()); } }); } /** * Show the successful message result of our REST call. * * @param val the value containing the JSON response from the server */ private void showSuccessMessage(JSONValue val) { JSONObject obj = val.isObject(); String name = JSONUtil.getStringValue(obj, "user"); String browser = JSONUtil.getStringValue(obj, "userAgent"); String server = JSONUtil.getStringValue(obj, "serverInfo"); String message = "Hello, " + name + "! <br/>You are using " + browser + ".<br/>The server is " + server + "."; m_longMessage.setHTML(message); } /** * returns whether the user is logged in or not * @return true if the user is logged in (browser cookie is there) */ public static boolean userLoggedIn() { String userToken = RESTility.getUserToken(); if ((userToken == null) || (userToken.length() <= 0)) { return false; } return true; } /** * Logout of the application */ public static void doLogout() { RESTility.getAuthProvider().logout(new RESTObjectCallBack<String>() { public void success(String message) { Window.Location.reload(); } public void error(String message) { Window.Location.reload(); } public void error(RESTException e) { MessageUtil.showFatalError(e.getReason()); } }); } }