com.google.api.gwt.samples.urlshortener.client.UrlshortenerEntryPoint.java Source code

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Here is the source code for com.google.api.gwt.samples.urlshortener.client.UrlshortenerEntryPoint.java

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/*
 * Copyright (c) 2011 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.api.gwt.samples.urlshortener.client;

import com.google.api.gwt.client.impl.ClientGoogleApiRequestTransport;
import com.google.api.gwt.client.impl.ClientOAuth2Login;
import com.google.api.gwt.samples.urlshortener.shared.Url;
import com.google.api.gwt.samples.urlshortener.shared.Urlshortener;
import com.google.api.gwt.samples.urlshortener.shared.Urlshortener.UrlContext;
import com.google.api.gwt.samples.urlshortener.shared.UrlshortenerAuthScope;
import com.google.api.gwt.shared.GoogleApiRequestTransport;
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.shared.SimpleEventBus;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.web.bindery.requestfactory.shared.Receiver;
import com.google.web.bindery.requestfactory.shared.ServerFailure;

/**
 * Simple sample app that retrieves information about a short URL and shortens a
 * long URL.
 *
 * @author jasonhall@google.com (Jason Hall)
 */
public class UrlshortenerEntryPoint implements EntryPoint {

    private static final String CLIENT_ID = "692753340433.apps.googleusercontent.com";
    private static final String API_KEY = "AIzaSyA5bNyuRQFaTQle_YC5BUH7tQzRmAPiqsM";
    private static final String APPLICATION_NAME = "UrlshortenerSample/1.0";

    private final Urlshortener urlShortener = GWT.create(Urlshortener.class);

    @Override
    public void onModuleLoad() {
        login();
    }

    /** Demonstrates authentication using OAuth 2.0. */
    private void login() {
        final Button button = new Button("Log in to get started");
        button.addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                new ClientOAuth2Login(CLIENT_ID).withScopes(UrlshortenerAuthScope.URLSHORTENER)
                        .login(new Receiver<String>() {
                            @Override
                            public void onSuccess(String accessToken) {
                                initialize(accessToken);
                            }
                        });
                button.setVisible(false);
            }
        });
        RootPanel.get().add(button);
    }

    /** Demonstrates initialization of the RequestTransport. */
    private void initialize(String accessToken) {
        new ClientGoogleApiRequestTransport().setApiAccessKey(API_KEY).setApplicationName(APPLICATION_NAME)
                .setAccessToken(accessToken).create(new Receiver<GoogleApiRequestTransport>() {
                    @Override
                    public void onSuccess(GoogleApiRequestTransport transport) {
                        urlShortener.initialize(new SimpleEventBus(), transport);

                        expand();
                    }

                    @Override
                    public void onFailure(ServerFailure error) {
                        Window.alert("Failed to initialize Transport");
                    }
                });
    }

    /** Demonstrates expanding a short URL by requesting its information. */
    private void expand() {
        String shortUrl = Window.prompt("Enter a short URL", "http://goo.gl/xwrT5");

        // Get a new RequestContext which we will execute.
        UrlContext urlContext = urlShortener.url();

        // Fire a get() request with the short URL we want to expand.
        urlContext.get(shortUrl).fire(new Receiver<Url>() {
            @Override
            public void onSuccess(Url response) {
                Window.alert("Long URL: " + response.getLongUrl() + "\n" //
                        + "Short URL: " + response.getId() + "\n" //
                        + "Status: " + response.getStatus());

                shorten();
            }

            @Override
            public void onFailure(ServerFailure error) {
                Window.alert("Error expanding a URL\n" + error.getMessage());
            }
        });
    }

    /** Demonstrates shortening a URL by inserting a new {@link Url} object. */
    private void shorten() {
        String longUrl = Window.prompt("Enter a long URL",
                "http://gwt-google-apis.googlecode.com/svn/trunk/apis/samples/urlshortener/demo/"
                        + "urlshortener.html");

        // Get a new RequestContext which we will execute.
        UrlContext urlContext = urlShortener.url();

        // Create a new Url instance with the longUrl we want to insert.
        Url url = urlContext.create(Url.class).setLongUrl(longUrl);

        // Fire an insert() request with the Url to insert.
        urlContext.insert(url).fire(new Receiver<Url>() {
            @Override
            public void onSuccess(Url response) {
                Window.alert("Long URL: " + response.getLongUrl() + "\n" //
                        + "Short URL: " + response.getId() + "\n" //
                        + "Status: " + response.getStatus());
            }

            @Override
            public void onFailure(ServerFailure error) {
                Window.alert("Error shortening a URL\n" + error.getMessage());
            }
        });
    }
}