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YAHOO.namespace('ext.state');
/**
* @class YAHOO.ext.state.Provider
* Abstract base class for provider implementations. This class provides methods
* for encoding and decoding <b>typed</b> variables including dates and defines the
* Provider interface.
*/
YAHOO.ext.state.Provider = function(){
YAHOO.ext.state.Provider.superclass.constructor.call(this);
/**
* @event statechange
* Fires when a state change occurs.
* @param {Provider} this
* @param {String} key The state key which was changed
* @param {String} value The encoded value for the state
*/
this.events = {
'statechange': new YAHOO.util.CustomEvent('statechange')
};
this.state = {};
};
YAHOO.extendX(YAHOO.ext.state.Provider, YAHOO.ext.util.Observable, {
/**
* Get the current value for a key.
* @param {String} name
* @param {Mixed} defaultValue
* @return {Mixed}
*/
get : function(name, defaultValue){
return typeof this.state[name] == 'undefined' ?
defaultValue : this.state[name];
},
/**
* Clear a value from the state.
*/
clear : function(name){
delete this.state[name];
this.fireEvent('statechange', this, name, null);
},
/**
* Set the value for a key.
* @param {String} name
* @param {Mixed} value
*/
set : function(name, value){
this.state[name] = value;
this.fireEvent('statechange', this, name, value);
},
/**
* Decodes a string previously encoded with {@link #encodeValue}.
* @param {String} value
* @return {Mixed} The value
*/
decodeValue : function(cookie){
var re = /^(a|n|d|b|s|o)\:(.*)$/;
var matches = re.exec(unescape(cookie));
if(!matches || !matches[1]) return; // non state cookie
var type = matches[1];
var v = matches[2];
switch(type){
case 'n':
return parseFloat(v);
case 'd':
return new Date(Date.parse(v));
case 'b':
return (v == '1');
case 'a':
var all = [];
var values = v.split('^');
for(var i = 0, len = values.length; i < len; i++){
all.push(this.decodeValue(values[i]))
}
return all;
case 'o':
var all = {};
var values = v.split('^');
for(var i = 0, len = values.length; i < len; i++){
var kv = values[i].split('=');
all[kv[0]] = this.decodeValue(kv[1]);
}
return all;
default:
return v;
}
},
/**
* Encode a value including type information.
* @param {Mixed} value
* @return {String}
*/
encodeValue : function(v){
var enc;
if(typeof v == 'number'){
enc = 'n:' + v;
}else if(typeof v == 'boolean'){
enc = 'b:' + (v ? '1' : '0');
}else if(v instanceof Date){
enc = 'd:' + v.toGMTString();
}else if(v instanceof Array){
var flat = '';
for(var i = 0, len = v.length; i < len; i++){
flat += this.encodeValue(v[i]);
if(i != len-1) flat += '^';
}
enc = 'a:' + flat;
}else if(typeof v == 'object'){
var flat = '';
for(var key in v){
if(typeof v[key] != 'function'){
flat += key + '=' + this.encodeValue(v[key]) + '^';
}
}
enc = 'o:' + flat.substring(0, flat.length-1);
}else{
enc = 's:' + v;
}
return escape(enc);
}
});
/**
* @class YAHOO.ext.state.Manager
* This is the global state manager. By default all components that are "state aware" check this class
* for state information if you don't pass them a custom state provider. In order for this class
* to be useful, it must be initialized with a provider when your application initializes.
<pre><code>
// in your initialization function
init : function(){
YAHOO.ext.state.Manager.setProvider(new YAHOO.ext.state.CookieProvider());
...
// supposed you have a {@link YAHOO.ext.BorderLayout}
var layout = new YAHOO.ext.BorderLayout(...);
layout.restoreState();
// or a {YAHOO.ext.BasicDialog}
var dialog = new YAHOO.ext.BasicDialog(...);
dialog.restoreState();
</code></pre>
* @singleton
*/
YAHOO.ext.state.Manager = new function(){
var provider = new YAHOO.ext.state.Provider();
return {
/**
* Configures the default provider for your application.
* @param {Provider} stateProvider
*/
setProvider : function(stateProvider){
provider = stateProvider;
},
/**
* Get the current value for a key.
* @param {String} name
* @param {Mixed} defaultValue
* @return {Mixed}
*/
get : function(key, defaultValue){
return provider.get(key, defaultValue);
},
/**
* Set the value for a key.
* @param {String} name
* @param {Mixed} value
*/
set : function(key, value){
provider.set(key, value);
},
/**
* Clear a value from the state.
*/
clear : function(key){
provider.clear(key);
},
/**
* Gets the currently configured provider.
* @return {Provider}
*/
getProvider : function(){
return provider;
}
};
}();
/**
* @class YAHOO.ext.state.CookieProvider
* @extends YAHOO.ext.state.Provider
* The default Provider implementation. The example below includes all valid configuration options and their
* default values.
<pre><code>
var cp = new YAHOO.ext.state.CookieProvider({
path: '/',
expires: new Date(new Date().getTime()+(1000*60*60*24*7)); //7 days
domain: null,
secure: false
})
YAHOO.ext.state.Manager.setProvider(cp);
</code></pre>
* @constructor
* Create a new CookieProvider
* @param {Object} config The configuration object
*/
YAHOO.ext.state.CookieProvider = function(config){
YAHOO.ext.state.CookieProvider.superclass.constructor.call(this);
this.path = '/';
this.expires = new Date(new Date().getTime()+(1000*60*60*24*7)); //7 days
this.domain = null;
this.secure = false;
YAHOO.ext.util.Config.apply(this, config);
this.state = this.readCookies();
};
YAHOO.extendX(YAHOO.ext.state.CookieProvider, YAHOO.ext.state.Provider, {
set : function(name, value){
if(typeof value == 'undefined' || value === null){
this.clear(name);
return;
}
this.setCookie(name, value);
YAHOO.ext.state.CookieProvider.superclass.set.call(this, name, value);
},
clear : function(name){
this.clearCookie(name);
YAHOO.ext.state.CookieProvider.superclass.clear.call(this, name);
},
readCookies : function(){
var cookies = {};
var c = document.cookie + ';';
var re = /\s?(.*?)=(.*?);/g;
var matches;
while((matches = re.exec(c)) != null){
var name = matches[1];
var value = matches[2];
if(name && name.substring(0,3) == 'ys-'){
cookies[name.substr(3)] = this.decodeValue(value);
}
}
return cookies;
},
setCookie : function(name, value){
document.cookie = "ys-"+ name + "=" + this.encodeValue(value) +
((this.expires == null) ? "" : ("; expires=" + this.expires.toGMTString())) +
((this.path == null) ? "" : ("; path=" + this.path)) +
((this.domain == null) ? "" : ("; domain=" + this.domain)) +
((this.secure == true) ? "; secure" : "");
},
clearCookie : function(name){
document.cookie = "ys-" + name + "=null; expires=Thu, 01-Jan-70 00:00:01 GMT" +
((this.path == null) ? "" : ("; path=" + this.path)) +
((this.domain == null) ? "" : ("; domain=" + this.domain)) +
((this.secure == true) ? "; secure" : "");
}
});
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