/*! - * Ext JS Library 3.0.3 - * Copyright(c) 2006-2009 Ext JS, LLC - * licensing@extjs.com - * http://www.extjs.com/license + +- \ No newline at end of file +/** + * @class Ext.state.Provider + * <p>Abstract base class for state provider implementations. The provider is responsible + * for setting values and extracting values to/from the underlying storage source. The + * storage source can vary and the details should be implemented in a subclass. For example + * a provider could use a server side database or the browser localstorage where supported.</p> + * + * <p>This class provides methods for encoding and decoding <b>typed</b> variables including + * dates and defines the Provider interface. By default these methods put the value and the + * type information into a delimited string that can be stored. These should be overridden in + * a subclass if you want to change the format of the encoded value and subsequent decoding.</p> */ -/** - * @class Ext.direct.Provider - * @extends Ext.util.Observable - *+Ext.define('Ext.state.Provider', { + mixins: { + observable: 'Ext.util.Observable' + }, + + /** + * @cfg {String} prefix A string to prefix to items stored in the underlying state store. + * Defaults to <tt>'ext-'</tt> + */ + prefix: 'ext-', + + constructor : function(config){ + config = config || {}; + var me = this; + Ext.apply(me, config); + /** + * @event statechange + * Fires when a state change occurs. + * @param {Provider} this This state provider + * @param {String} key The state key which was changed + * @param {String} value The encoded value for the state + */ + me.addEvents("statechange"); + me.state = {}; + me.mixins.observable.constructor.call(me); + }, + + /** + * Returns the current value for a key + * @param {String} name The key name + * @param {Mixed} defaultValue A default value to return if the key's value is not found + * @return {Mixed} The state data + */ + get : function(name, defaultValue){ + return typeof this.state[name] == "undefined" ? + defaultValue : this.state[name]; + }, + + /** + * Clears a value from the state + * @param {String} name The key name + */ + clear : function(name){ + var me = this; + delete me.state[name]; + me.fireEvent("statechange", me, name, null); + }, + + /** + * Sets the value for a key + * @param {String} name The key name + * @param {Mixed} value The value to set + */ + set : function(name, value){ + var me = this; + me.state[name] = value; + me.fireEvent("statechange", me, name, value); + }, + + /** + * Decodes a string previously encoded with {@link #encodeValue}. + * @param {String} value The value to decode + * @return {Mixed} The decoded value + */ + decodeValue : function(value){ + + // a -> Array + // n -> Number + // d -> Date + // b -> Boolean + // s -> String + // o -> Object + // -> Empty (null) + + var me = this, + re = /^(a|n|d|b|s|o|e)\:(.*)$/, + matches = re.exec(unescape(value)), + all, + type, + value, + keyValue; + + if(!matches || !matches[1]){ + return; // non state + } + + type = matches[1]; + value = matches[2]; + switch (type) { + case 'e': + return null; + case 'n': + return parseFloat(value); + case 'd': + return new Date(Date.parse(value)); + case 'b': + return (value == '1'); + case 'a': + all = []; + if(value != ''){ + Ext.each(value.split('^'), function(val){ + all.push(me.decodeValue(val)); + }, me); + } + return all; + case 'o': + all = {}; + if(value != ''){ + Ext.each(value.split('^'), function(val){ + keyValue = val.split('='); + all[keyValue[0]] = me.decodeValue(keyValue[1]); + }, me); + } + return all; + default: + return value; + } + }, + + /** + * Encodes a value including type information. Decode with {@link #decodeValue}. + * @param {Mixed} value The value to encode + * @return {String} The encoded value + */ + encodeValue : function(value){ + var flat = '', + i = 0, + enc, + len, + key; + + if (value == null) { + return 'e:1'; + } else if(typeof value == 'number') { + enc = 'n:' + value; + } else if(typeof value == 'boolean') { + enc = 'b:' + (value ? '1' : '0'); + } else if(Ext.isDate(value)) { + enc = 'd:' + value.toGMTString(); + } else if(Ext.isArray(value)) { + for (len = value.length; i < len; i++) { + flat += this.encodeValue(value[i]); + if (i != len - 1) { + flat += '^'; + } + } + enc = 'a:' + flat; + } else if (typeof value == 'object') { + for (key in value) { + if (typeof value[key] != 'function' && value[key] !== undefined) { + flat += key + '=' + this.encodeValue(value[key]) + '^'; + } + } + enc = 'o:' + flat.substring(0, flat.length-1); + } else { + enc = 's:' + value; + } + return escape(enc); + } +});Ext.direct.Provider is an abstract class meant to be extended.
- * - *For example ExtJs implements the following subclasses:
- *- * @abstract - */ -Ext.direct.Provider = Ext.extend(Ext.util.Observable, { - /** - * @cfg {String} id - * The unique id of the provider (defaults to an {@link Ext#id auto-assigned id}). - * You should assign an id if you need to be able to access the provider later and you do - * not have an object reference available, for example: - *-Provider -| -+---{@link Ext.direct.JsonProvider JsonProvider} - | - +---{@link Ext.direct.PollingProvider PollingProvider} - | - +---{@link Ext.direct.RemotingProvider RemotingProvider} - *- */ - - /** - * @cfg {Number} priority - * Priority of the request. Lower is higher priority, 0 means "duplex" (always on). - * All Providers default to 1 except for PollingProvider which defaults to 3. - */ - priority: 1, - - /** - * @cfg {String} type - * Required, undefined by default. The type of provider specified - * to {@link Ext.Direct Ext.Direct}.{@link Ext.Direct#addProvider addProvider} to create a - * new Provider. Acceptable values by default are:-Ext.Direct.addProvider( - { - type: 'polling', - url: 'php/poll.php', - id: 'poll-provider' - } -); - -var p = {@link Ext.Direct Ext.Direct}.{@link Ext.Direct#getProvider getProvider}('poll-provider'); -p.disconnect(); - *- */ - - // private - constructor : function(config){ - Ext.apply(this, config); - this.addEvents( - /** - * @event connect - * Fires when the Provider connects to the server-side - * @param {Ext.direct.Provider} provider The {@link Ext.direct.Provider Provider}. - */ - 'connect', - /** - * @event disconnect - * Fires when the Provider disconnects from the server-side - * @param {Ext.direct.Provider} provider The {@link Ext.direct.Provider Provider}. - */ - 'disconnect', - /** - * @event data - * Fires when the Provider receives data from the server-side - * @param {Ext.direct.Provider} provider The {@link Ext.direct.Provider Provider}. - * @param {event} e The {@link Ext.Direct#eventTypes Ext.Direct.Event type} that occurred. - */ - 'data', - /** - * @event exception - * Fires when the Provider receives an exception from the server-side - */ - 'exception' - ); - Ext.direct.Provider.superclass.constructor.call(this, config); - }, - - /** - * Returns whether or not the server-side is currently connected. - * Abstract method for subclasses to implement. - */ - isConnected: function(){ - return false; - }, - - /** - * Abstract methods for subclasses to implement. - */ - connect: Ext.emptyFn, - - /** - * Abstract methods for subclasses to implement. - */ - disconnect: Ext.emptyFn -}); -- *
- polling : {@link Ext.direct.PollingProvider PollingProvider}
- *- remoting : {@link Ext.direct.RemotingProvider RemotingProvider}
- *