com.google.code.gwt.geolocation.client.impl.GearsFactory.java Source code

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Here is the source code for com.google.code.gwt.geolocation.client.impl.GearsFactory.java

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/*
 * Copyright 2010 Bart Guijt and others.
 * 
 * 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.code.gwt.geolocation.client.impl;

import com.google.code.gwt.geolocation.client.Geolocation;
import com.google.gwt.core.client.JavaScriptObject;

/**
 * Represents the Google Gears Factory class.
 * 
 * <p>
 * The primary purpose is to create a {@link Geolocation} object.
 * </p>
 * 
 * @author bguijt
 * 
 * @see <a href="http://code.google.com/apis/gears/api_factory.html">Google
 *      Gears Factory</a>
 */
public final class GearsFactory extends JavaScriptObject {

    protected GearsFactory() {
    }

    /**
     * Returns an instance of the Gears factory.
     * 
     * <p>
     * Most of this code is from <code>gears_init.js</code>.
     * </p>
     */
    public native static GearsFactory getInstance() /*-{
                                                    // We are already defined. Hooray!
                                                    // Mind you: We're *not* using $wnd on purpose here!
                                                    if (window.google && google.gears) {
                                                    return google.gears.factory;
                                                    }
                                                        
                                                    var factory = null;
                                                        
                                                    // Firefox
                                                    if (typeof GearsFactory != "undefined") {
                                                    factory = new GearsFactory();
                                                    } else {
                                                    // IE
                                                    try {
                                                    factory = new ActiveXObject("Gears.Factory");
                                                    // privateSetGlobalObject is only required and supported on IE Mobile on
                                                    // WinCE.
                                                    if (factory.getBuildInfo().indexOf("ie_mobile") != -1) {
                                                    factory.privateSetGlobalObject(this);
                                                    }
                                                    } catch (e) {
                                                    // Safari
                                                    if ((typeof navigator.mimeTypes != "undefined")
                                                    && navigator.mimeTypes["application/x-googlegears"]) {
                                                    factory = document.createElement("object");
                                                    factory.style.display = "none";
                                                    factory.width = 0;
                                                    factory.height = 0;
                                                    factory.type = "application/x-googlegears";
                                                    document.documentElement.appendChild(factory);
                                                    }
                                                    }
                                                    }
                                                        
                                                    // *Do not* define any objects if Gears is not installed. This mimics the
                                                    // behavior of Gears defining the objects in the future.
                                                    if (!factory) {
                                                    return null;
                                                    }
                                                        
                                                    // Now set up the objects, being careful not to overwrite anything.
                                                    //
                                                    // Note: In Internet Explorer for Windows Mobile, you can't add properties to
                                                    // the window object. However, global objects are automatically added as
                                                    // properties of the window object in all browsers.
                                                    if (!window.google) {
                                                    google = {};
                                                    }
                                                        
                                                    if (!google.gears) {
                                                    google.gears = {factory: factory};
                                                    }
                                                        
                                                    return factory;
                                                    }-*/;

    public native Geolocation createGeolocation() /*-{
                                                  return this.create("beta.geolocation");
                                                  }-*/;

    public native String getVersion() /*-{
                                      return this.version;
                                      }-*/;

    public native String getBuildInfo() /*-{
                                        return this.getBuildInfo();
                                        }-*/;
}