com.google.gwt.gdata.sample.hellogdata.client.CalendarCreateRecurringEventDemo.java Source code

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/*
 * 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.Recurrence;
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;

/**
 * The following example demonstrates how to create a recurring Calendar event.
 */
public class CalendarCreateRecurringEventDemo 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 CalendarCreateRecurringEventDemo();
            }

            @Override
            public String getDescription() {
                return "<p>This sample demonstrates how to create and insert "
                        + "a recurring event into the authenticated user's primary "
                        + "calendar. The private/full feed is used for event insertion. "
                        + "The specifics of the recurrence such as recurring frequency "
                        + "and recurring duration are specified with a recurring string "
                        + "which is based on the iCalendar specification</p>";
            }

            @Override
            public String getName() {
                return "Calendar - Creating a recurring event";
            }
        };
    }

    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 CalendarCreateRecurringEventDemo() {
        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 the event's recurrence settings.
     * On success and failure, display a status message.
     * 
     * @param eventsFeedUri The uri of the events feed into which to 
     * insert the new event
     */
    private void createEvent(String eventsFeedUri) {
        showStatus("Creating event...", false);
        CalendarEventEntry eventEntry = CalendarEventEntry.newInstance();
        eventEntry.setTitle(Text.newInstance());
        eventEntry.getTitle().setText("GWT-Calendar-Client: insert recurring event");
        Recurrence recurrence = Recurrence.newInstance();
        String icalBreak = "\r\n";
        String recurrenceString = "DTSTART;TZID=America/Los_Angeles:20090101T080000" + icalBreak
                + "DTEND;TZID=America/Los_Angeles:20090101T090000" + icalBreak
                + "RRULE:FREQ=WEEKLY;UNTIL=20090701T160000Z;";
        recurrence.setValue(recurrenceString);
        eventEntry.setRecurrence(recurrence);
        service.insertEntry(eventsFeedUri, eventEntry, new CalendarEventEntryCallback() {
            public void onFailure(CallErrorException caught) {
                showStatus("An error occurred while creating a Calendar event: " + caught.getMessage(), true);
            }

            public void onSuccess(CalendarEventEntry result) {
                showStatus("Created a recurring event.", 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_CreateRecurringEventDemo_v2.0");
        if (User.getStatus(scope) == AuthSubStatus.LOGGED_IN) {
            Button startButton = new Button("Create an event");
            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);
        }
    }
}