metro4/source/components/storage/storage.js

The front-end framework for Build responsive, mobile-first projects on the web with the first front-end component library in Metro Style

/* global Metro */
(function(Metro) {
    'use strict';
    var Utils = Metro.utils;

    var MetroStorage = function(type){
        return new MetroStorage.init(type);
    };

    MetroStorage.prototype = {
        setKey: function(key){
            this.key = key
        },

        getKey: function(){
            return this.key;
        },

        setItem: function(key, value){
            this.storage.setItem(this.key + ":" + key, JSON.stringify(value));
        },

        getItem: function(key, default_value, reviver){
            var result, value;

            value = this.storage.getItem(this.key + ":" + key);

            try {
                result = JSON.parse(value, reviver);
            } catch (e) {
                result = null;
            }
            return Utils.nvl(result, default_value);
        },

        getItemPart: function(key, sub_key, default_value, reviver){
            var i;
            var val = this.getItem(key, default_value, reviver);

            sub_key = sub_key.split("->");
            for(i = 0; i < sub_key.length; i++) {
                val = val[sub_key[i]];
            }
            return val;
        },

        delItem: function(key){
            this.storage.removeItem(this.key + ":" + key)
        },

        size: function(unit){
            var divider;
            switch (unit) {
                case 'm':
                case 'M': {
                    divider = 1024 * 1024;
                    break;
                }
                case 'k':
                case 'K': {
                    divider = 1024;
                    break;
                }
                default: divider = 1;
            }
            return JSON.stringify(this.storage).length / divider;
        }
    };

    MetroStorage.init = function(type){

        this.key = "";
        this.storage = type ? type : window.localStorage;

        return this;
    };

    MetroStorage.init.prototype = MetroStorage.prototype;

    Metro.storage = MetroStorage(window.localStorage);
    Metro.session = MetroStorage(window.sessionStorage);
}(Metro));