//Copyright 2007, Google Inc.

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// 3. Neither the name of Google Inc. nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Some WinCE devices use 'unknown' rather than 'undefined'. If an element has
// type 'unknown', we can not pass it to a function, so we must pass its type
// instead.
function isDefined(type) {
 return (type != 'undefined' && type != 'unknown');
}

function childNodes(element) {
 if (isDefined(typeof element.childNodes)) {
 return element.childNodes;
 } else if (isDefined(typeof element.children)) {
 return element.children;
 }
}

function getElementById(element_name) {
 if (isDefined(typeof document.getElementById)) {
 return document.getElementById(element_name);
 } else if(typeof isDefined(document.all)) {
 return document.all[element_name];
 }
}

function setTextContent(elem, content) {
 if (isDefined(typeof elem.innerText)) {
 elem.innerText = content;
 } else if (isDefined(typeof elem.textContent)) {
 elem.textContent = content;
 }
}

function setupSample() {
 // Make sure we have Gears. If not, tell the user.
 if (!window.google || !google.gears) {
 if (confirm("Install Google Gears to Create Desktop Shortcut of this website !")) {
 var spliceStart = location.href.indexOf("/samples");
 location.href = "http://gears.google.com";
 //location.href.substring(0, spliceStart) + "/";
 return;
 }
 }

 var viewSourceElem = getElementById("view-source");
 if (!viewSourceElem) {
 return;
}
 var elm;
if (navigator.product == "Gecko") {
 // If we're gecko, we can show the source of the application with the
 // view-source protocol.
elm = "<a href='view-source:" + location.href + "'>" +
 "View Demo Source" +
 "</a>";
 } else {
 // Otherwise, just tell users how to do it manually.
 elm = "<em>" +
 "To see how this works, use the <strong>view " +
 "source</strong> feature of your browser" +
 "</em>";
 }
 viewSourceElem.innerHTML += elm;
}

function checkProtocol() {
 if (location.protocol.indexOf('http') != 0) {
 setError('This sample must be hosted on an HTTP server');
 return false;
 } else {
 return true;
 }
}

function addStatus(message, opt_class) {
 var elm = getElementById('status');
 var id = 'statusEntry' + (childNodes(elm).length + 1);
 if (!elm) return;
 if (opt_class) {
 elm.innerHTML += '<span id="' + id + '" class="' + opt_class + '"></span>';
} else {
 elm.innerHTML += '<span id="' + id + '"></span>';
 }
 elm.innerHTML += '<br>';
 setTextContent(getElementById(id), message);
}

function clearStatus() {
 var elm = getElementById('status');
 elm.innerHTML = '';
}

function setError(s) {
 clearStatus();
 addStatus(s, 'error');
}

//setupSample();