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

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Here is the source code for com.google.gwt.gdata.sample.hellogdata.client.ContactsCreateContactGroupDemo.java

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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.atom.Text;
import com.google.gwt.gdata.client.contacts.ContactGroupEntry;
import com.google.gwt.gdata.client.contacts.ContactGroupEntryCallback;
import com.google.gwt.gdata.client.contacts.ContactsService;
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 contact group.
 */
public class ContactsCreateContactGroupDemo 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 ContactsCreateContactGroupDemo();
            }

            @Override
            public String getDescription() {
                return "<p>This sample demonstrates how to create a new " + "contact group.</p>";
            }

            @Override
            public String getName() {
                return "Contacts - Creating contact groups";
            }
        };
    }

    private ContactsService service;
    private FlexTable mainPanel;
    private final String scope = "http://www.google.com/m8/feeds/";

    /**
     * Setup the Contacts service and create the main content panel.
     * If the user is not logged on to Contacts display a message,
     * otherwise start the demo by creating a contact group.
     */
    private ContactsCreateContactGroupDemo() {
        mainPanel = new FlexTable();
        initWidget(mainPanel);
        if (!GData.isLoaded(GDataSystemPackage.CONTACTS)) {
            showStatus("Loading the GData Contacts package...", false);
            GData.loadGDataApi(GDATA_API_KEY, new Runnable() {
                public void run() {
                    startDemo();
                }
            }, GDataSystemPackage.CONTACTS);
        } else {
            startDemo();
        }
    }

    /**
     * Create a contact group by inserting a contact group entry into
     * a contact groups feed.
     * Set the contact group's title to an arbitrary string. Here
     * we prefix the title with 'GWT-Contacts-Client' so that
     * we can identify which groups were created by this demo.
     * On success and failure, display a status message.
     * 
     * @param contactGroupFeedUri The uri of the groups feed into which 
     * to insert the new group entry
     */
    private void createContactGroup(String contactGroupFeedUri) {
        showStatus("Creating contact group...", false);
        ContactGroupEntry entry = ContactGroupEntry.newInstance();
        entry.setTitle(Text.newInstance());
        entry.getTitle().setText("GWT-Contacts-Client - Create Group");
        service.insertEntry(contactGroupFeedUri, entry, new ContactGroupEntryCallback() {
            public void onFailure(CallErrorException caught) {
                showStatus("An error occurred while creating a contact group: " + caught.getMessage(), true);
            }

            public void onSuccess(ContactGroupEntry result) {
                showStatus("Created a contact group.", 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 = ContactsService.newInstance("HelloGData_Contacts_CreateContactGroupDemo_v2.0");
        if (User.getStatus(scope) == AuthSubStatus.LOGGED_IN) {
            Button startButton = new Button("Create a contact group");
            startButton.addClickHandler(new ClickHandler() {
                public void onClick(ClickEvent event) {
                    createContactGroup("http://www.google.com/m8/feeds/groups/default/full");
                }
            });
            mainPanel.setWidget(0, 0, startButton);
        } else {
            showStatus("You are not logged on to Google Contacts.", true);
        }
    }
}