add extjs 6.0.1 sources

[extjs.git] / extjs / classic / classic / src / state / LocalStorageProvider.js

/**\r
 * A Provider implementation which saves and retrieves state via the HTML5 localStorage API\r
 * or IE `userData` storage. For details see `Ext.util.LocalStorage`.\r
 * \r
 * If the browser does not support local storage, there will be no attempt to read the state.\r
 * Before creating this class, check {@link Ext.util.LocalStorage#supported}.\r
 */\r
Ext.define('Ext.state.LocalStorageProvider', {\r
    extend: 'Ext.state.Provider',\r
    requires: [\r
        'Ext.util.LocalStorage'\r
    ],\r
    \r
    alias: 'state.localstorage',\r
   \r
    constructor: function () {\r
        var me = this;\r
\r
        me.callParent(arguments);\r
\r
        me.store = me.getStorageObject();\r
        if (me.store) {\r
            me.state = me.readLocalStorage();\r
        } else {\r
            me.state = {};\r
        }\r
    },\r
    \r
    readLocalStorage: function () {\r
        var store = this.store,\r
            data = {},\r
            keys = store.getKeys(),\r
            i = keys.length,\r
            key;\r
            \r
        while (i--) {\r
            key = keys[i];\r
            data[key] = this.decodeValue(store.getItem(key));\r
        }\r
\r
        return data;\r
    },\r
    \r
    set: function (name, value) {\r
        var me = this;\r
        \r
        me.clear(name);\r
        if (value != null) { // !== undefined && !== null\r
            me.store.setItem(name, me.encodeValue(value));\r
            me.callParent(arguments);\r
        }\r
    },\r
\r
    /**\r
     * @private\r
     */\r
    clear: function (name) {\r
        this.store.removeItem(name);\r
        this.callParent(arguments);\r
    },\r
    \r
    getStorageObject: function () {\r
        var prefix = this.prefix,\r
            id = prefix,\r
            n = id.length - 1;\r
\r
        if (id.charAt(n) === '-') {\r
            id = id.substring(0, n);\r
        }\r
\r
        return new Ext.util.LocalStorage({\r
            id: id,\r
            prefix: prefix\r
        });\r
    }    \r
});\r