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.GData; import com.google.gwt.gdata.client.GDataSystemPackage; import com.google.gwt.gdata.client.Where; import com.google.gwt.gdata.client.atom.Text; import com.google.gwt.gdata.client.calendar.CalendarEntry; import com.google.gwt.gdata.client.calendar.CalendarEntryCallback; import com.google.gwt.gdata.client.calendar.CalendarService; import com.google.gwt.gdata.client.calendar.ColorProperty; import com.google.gwt.gdata.client.calendar.HiddenProperty; import com.google.gwt.gdata.client.calendar.TimeZoneProperty; 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; /** * The following example demonstrates how to create a calendar. */ public class CalendarCreateCalendarDemo 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 CalendarCreateCalendarDemo(); } @Override public String getDescription() { return "<p>This sample demonstrates how to create and insert " + "a new calendar. The owncalendars feed is used to insert the " + "new calendar entry for the authenticated user.</p>"; } @Override public String getName() { return "Calendar - Creating a calendar"; } }; } 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 a calendar. */ public CalendarCreateCalendarDemo() { 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 by inserting a calendar entry into * a calendar feed. * Set the calendar's title to an arbitrary string. Here * we prefix the title with 'GWT-Calendar-Client' so that * we can identify which calendars were created by this demo. * We also specify values for summary, time zone, location * and color. * On success and failure, display a status message. * * @param calendarsFeedUri The uri of the calendars feed into * which to insert the new calendar entry */ private void createCalendar(String calendarsFeedUri) { CalendarEntry entry = CalendarEntry.newInstance(); entry.setTitle(Text.newInstance()); entry.getTitle().setText("GWT-Calendar-Client: insert calendar"); entry.setSummary(Text.newInstance()); entry.getSummary().setText("This is a test calendar created by GWT Client"); entry.setTimeZone(TimeZoneProperty.newInstance()); entry.getTimeZone().setValue("America/Los_Angeles"); Where where = Where.newInstance(); where.setLabel("Mountain View, CA"); where.setValueString("Mountain View, CA"); entry.addLocation(where); entry.setHidden(HiddenProperty.newInstance()); entry.getHidden().setValue(false); entry.setColor(ColorProperty.newInstance()); entry.getColor().setValue(ColorProperty.VALUE_RGB_2952A3); showStatus("Creating calendar...", false); service.insertEntry(calendarsFeedUri, entry, new CalendarEntryCallback() { public void onFailure(CallErrorException caught) { showStatus("An error occurred while retrieving the Calendar feed: " + caught.getMessage(), true); } public void onSuccess(CalendarEntry result) { showStatus("Created a Calendar entry titled '" + result.getTitle().getText() + "'", 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_CreateCalendarDemo_v2.0"); if (User.getStatus(scope) == AuthSubStatus.LOGGED_IN) { Button startButton = new Button("Create a calendar"); startButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { createCalendar("http://www.google.com/calendar/feeds/default/" + "owncalendars/full"); } }); mainPanel.setWidget(0, 0, startButton); } else { showStatus("You are not logged on to Google Calendar.", true); } } }