Java tutorial
/* * Copyright 2008 Google 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.google.gwt.gdata.sample.hellogdata.client; import com.google.gwt.accounts.client.AuthSubStatus; import com.google.gwt.accounts.client.User; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.gdata.client.DateTime; import com.google.gwt.gdata.client.GData; import com.google.gwt.gdata.client.GDataSystemPackage; import com.google.gwt.gdata.client.Reminder; import com.google.gwt.gdata.client.When; import com.google.gwt.gdata.client.atom.Text; import com.google.gwt.gdata.client.calendar.CalendarEventEntry; import com.google.gwt.gdata.client.calendar.CalendarEventEntryCallback; import com.google.gwt.gdata.client.calendar.CalendarService; import com.google.gwt.gdata.client.impl.CallErrorException; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.Label; import java.util.Date; /** * The following example demonstrates how to create an event reminder. */ public class CalendarCreateEventReminderDemo extends GDataDemo { /** * This method is used by the main sample app to obtain * information on this sample and a sample instance. * * @return An instance of this demo. */ public static GDataDemoInfo init() { return new GDataDemoInfo() { @Override public GDataDemo createInstance() { return new CalendarCreateEventReminderDemo(); } @Override public String getDescription() { return "<p>This sample demonstrates how to create and insert " + "a single event with a reminder to the authenticated user's " + "primary calendar. The private/full feed is used for event " + "insertion.</p>"; } @Override public String getName() { return "Calendar - Creating an event reminder"; } }; } private CalendarService service; private FlexTable mainPanel; private final String scope = "http://www.google.com/calendar/feeds/"; /** * Setup the Calendar service and create the main content panel. * If the user is not logged on to Calendar display a message, * otherwise start the demo by creating an event. */ public CalendarCreateEventReminderDemo() { mainPanel = new FlexTable(); initWidget(mainPanel); if (!GData.isLoaded(GDataSystemPackage.CALENDAR)) { showStatus("Loading the GData Calendar package...", false); GData.loadGDataApi(GDATA_API_KEY, new Runnable() { public void run() { startDemo(); } }, GDataSystemPackage.CALENDAR); } else { startDemo(); } } /** * Create a calendar event by inserting an event entry into * a calendar events feed. * Set the event's title to an arbitrary string. Here * we prefix the title with 'GWT-Calendar-Client' so that * we can identify which events were created by this demo. * We also specify values for time span and reminder settings. * On success and failure, display a status message. * * @param eventsFeedUri The uri of the events feed into which to * insert the new event */ @SuppressWarnings("deprecation") private void createEvent(String eventsFeedUri) { showStatus("Creating event reminder...", false); CalendarEventEntry entry = CalendarEventEntry.newInstance(); entry.setTitle(Text.newInstance()); entry.getTitle().setText("GWT-Calendar-Client: add event reminder"); When when = When.newInstance(); Date startTime = new Date(); Date endTime = new Date(); endTime.setHours(endTime.getHours() + 1); when.setStartTime(DateTime.newInstance(startTime)); when.setEndTime(DateTime.newInstance(endTime)); Reminder reminder = Reminder.newInstance(); reminder.setMinutes(30); reminder.setMethod(Reminder.METHOD_ALERT); when.addReminder(reminder); entry.addTime(when); service.insertEntry(eventsFeedUri, entry, new CalendarEventEntryCallback() { public void onFailure(CallErrorException caught) { showStatus( "An error occurred while creating a Calendar event " + "reminder: " + caught.getMessage(), true); } public void onSuccess(CalendarEventEntry result) { showStatus("Created a Calendar event reminder.", false); } }); } /** * Displays a status message to the user. * * @param message The message to display. * @param isError Indicates whether the status is an error status. */ private void showStatus(String message, boolean isError) { mainPanel.clear(); mainPanel.insertRow(0); mainPanel.addCell(0); Label msg = new Label(message); if (isError) { msg.setStylePrimaryName("hm-error"); } mainPanel.setWidget(0, 0, msg); } /** * Starts this demo. */ private void startDemo() { service = CalendarService.newInstance("HelloGData_Calendar_CreateEventReminderDemo_v2.0"); if (User.getStatus(scope) == AuthSubStatus.LOGGED_IN) { Button startButton = new Button("Create an event reminder"); startButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { createEvent("http://www.google.com/calendar/feeds/default/private/full"); } }); mainPanel.setWidget(0, 0, startButton); } else { showStatus("You are not logged on to Google Calendar.", true); } } }