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1// Copyright 2007, Google Inc.
2//
3// Redistribution and use in source and binary forms, with or without
4// modification, are permitted provided that the following conditions are met:
5//
6// 1. Redistributions of source code must retain the above copyright notice,
7// this list of conditions and the following disclaimer.
8// 2. Redistributions in binary form must reproduce the above copyright notice,
9// this list of conditions and the following disclaimer in the documentation
10// and/or other materials provided with the distribution.
11// 3. Neither the name of Google Inc. nor the names of its contributors may be
12// used to endorse or promote products derived from this software without
13// specific prior written permission.
14//
15// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
16// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
17// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
18// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25//
26// Sets up google.gears.*, which is *the only* supported way to access Gears.
27//
28// Circumvent this file at your own risk!
29//
30// In the future, Gears may automatically define google.gears.* without this
31// file. Gears may use these objects to transparently fix bugs and compatibility
32// issues. Applications that use the code below will continue to work seamlessly
33// when that happens.
34
35(function() {
36 // We are already defined. Hooray!
37 if (window.google && google.gears) {
38 return;
39 }
40
41 var factory = null;
42
43 // Firefox
44 if (typeof GearsFactory != 'undefined') {
45 factory = new GearsFactory();
46 } else {
47 // IE
48 try {
49 factory = new ActiveXObject('Gears.Factory');
50 // privateSetGlobalObject is only required and supported on IE Mobile on
51 // WinCE.
52 if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
53 factory.privateSetGlobalObject(this);
54 }
55 } catch (e) {
56 // Safari
57 if ((typeof navigator.mimeTypes != 'undefined')
58 && navigator.mimeTypes["application/x-googlegears"]) {
59 factory = document.createElement("object");
60 factory.style.display = "none";
61 factory.width = 0;
62 factory.height = 0;
63 factory.type = "application/x-googlegears";
64 document.documentElement.appendChild(factory);
65 }
66 }
67 }
68
69 // *Do not* define any objects if Gears is not installed. This mimics the
70 // behavior of Gears defining the objects in the future.
71 if (!factory) {
72 return;
73 }
74
75 // Now set up the objects, being careful not to overwrite anything.
76 //
77 // Note: In Internet Explorer for Windows Mobile, you can't add properties to
78 // the window object. However, global objects are automatically added as
79 // properties of the window object in all browsers.
80 if (!window.google) {
81 google = {};
82 }
83
84 if (!google.gears) {
85 google.gears = {factory: factory};
86 }
87})();