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  <pre class="prettyprint lang-js"><span id='Ext-state-LocalStorageProvider'>/**
</span> * @class Ext.state.LocalStorageProvider
 * A Provider implementation which saves and retrieves state via the HTML5 localStorage object.
 * If the browser does not support local storage, there will be no attempt to read the state.
 * Before creating this class, a check should be made to {@link Ext.supports#LocalStorage}.
 */
 
Ext.define('Ext.state.LocalStorageProvider', {
    /* Begin Definitions */
    
    extend: 'Ext.state.Provider',
    
    alias: 'state.localstorage',
    
<span id='Ext-state-LocalStorageProvider-method-constructor'>    /* End Definitions */
</span>   
    constructor: function(){
        var me = this;
        me.callParent(arguments);
        me.store = me.getStorageObject();
        if (me.store) {
            me.state = me.readLocalStorage();
        } else {
            me.state = {};
        }
    },
    
<span id='Ext-state-LocalStorageProvider-method-readLocalStorage'>    readLocalStorage: function(){
</span>        var store = this.store,
            i = 0,
            len = store.length,
            prefix = this.prefix,
            prefixLen = prefix.length,
            data = {},
            key;
            
        for (; i &lt; len; ++i) {
            key = store.key(i);
            if (key.substring(0, prefixLen) == prefix) {
                data[key.substr(prefixLen)] = this.decodeValue(store.getItem(key));
            }            
        }
        return data;
    },
    
<span id='Ext-state-LocalStorageProvider-method-set'>    set : function(name, value){
</span>        var me = this;
        
        me.clear(name);
        if (typeof value == &quot;undefined&quot; || value === null) {
            return;
        }
        me.store.setItem(me.prefix + name, me.encodeValue(value));
        me.callParent(arguments);
    },
 
<span id='Ext-state-LocalStorageProvider-method-clear'>    // private
</span>    clear : function(name){
        this.store.removeItem(this.prefix + name);
        this.callParent(arguments);
    },
    
<span id='Ext-state-LocalStorageProvider-method-getStorageObject'>    getStorageObject: function(){
</span>        if (Ext.supports.LocalStorage) {
            return window.localStorage;
        }
        //&lt;debug&gt;
        Ext.Error.raise('LocalStorage is not supported by the current browser');
        //&lt;/debug&gt;
        return false;
    }    
});
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