Local Storage Manager (timestamped, extra functionality, session & local storage) Deps: [underscore]

StorageManager.js

var CacheManager = window.CacheManager = function (storage) {

    var name = '';

    if (typeof storage !== "string") {
        throw new TypeError('The name of storage needs to be a character string.');
    }

    name = _.capitalize(storage) + 'Storage';

    if (!CacheManager[name]) {
        throw new TypeError('The storage ' + name + ' is not defined.');
    }

    this.storage = CacheManager[name];

    this.set = function (key, content, limit) {
        var cacheTime = new Date(),
            cacheContent = null;

        if (typeof limit !== "number") {
            if (limit === "hour") limit = 3600000;
            else if (limit ==="day") limit = 86400000;
            else if (limit === "week") limit = 604800000;
            else limit = 604800000;
        }

        cacheTime.setTime(cacheTime.getTime() + limit);

        cacheContent = JSON.stringify({
            limit: cacheTime.getTime(),
            content: content
        });

        this.storage.setItem(key, cacheContent);
    };

    this.get = function (key) {
        var cache = null,
            cacheContent = this.storage.getItem(key);

        if (!cacheContent) {
            return null;
        }

        cache = JSON.parse(cacheContent);
        cache = _.defaults(cache, {
            key: key,
            storage: this
        });
        return new CacheManager.CacheContent(cache);
    };

    this.remove = function (key) {
        this.storage.removeItem(key);
    };

    this.clear = function () {
        this.storage.clear();
    };

};

CacheManager.LocalStorage = window.localStorage;

CacheManager.SessionStorage = window.sessionStorage;

CacheManager.HashStorage = {
    _store: {},
    setItem: function (key, content) {
        if (typeof key !== "string") {
            throw new TypeError('The key needs to be a character string.');
        }
        if (!content) {
            throw new TypeError('The contents which cash carries out are empty.');
        }
        this._store[key] = content;
    },
    getItem: function (key) {
        if (!this._store[key]) {
            return null;
        }
        return this._store[key];
    },
    removeItem: function (key) {
        delete this._store[key];
    },
    clear: function () {
        this._store = {};
    }
};

CacheManager.CacheContent = function (properties) {

    var instance = this, getter = null;

    // generate getter methods
    _.each(properties, function (value, key) {
        getter = 'get' + _.capitalize(key);
        instance[getter] = function () {
            return properties[key];
        };
    });

    _.defaults(instance, {

        isLimit: function () {
            return this.getLimit() > new Date().getTime();
        },

        destroy: function () {
            var key = this.getKey(),
                storage = this.getStorage();

            storage.removeItem(key);
        }
    });
};