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sticky-0.5.js
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sticky-0.5.js
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/**
* Sticky
*
* Version 0.5
* Copyright 2011 Alexander C. Mingoia
* MIT Licensed
*
* Simple JavaScript HTML5 browser storage cache. Persists to
* memory, indexedDB, webSQL, localStorage, globalStorage, and cookies.
*
* Objects and arrays are stringified before storage, and
* strings longer than 128 characters aren't persisted to cookies.
*
* WebSQL (SQLite)
* Chrome 4+, Opera 10.5+, Safari 3.1+, and Android Browser 2.1+
* 5MB of data per DB, but can request more
* IndexedDB
* IE 10+, FireFox 4+, and Chrome 11+
* localStorage
* Safari 4+, Mobile Safari (iPhone/iPad), Firefox 3.5+, Internet Explorer 8+ and Chrome 4+
* 5MB of data per domain
* globalStorage
* FireFox 2-3
* Cookies
* 1-4KB depending on character encoding and implementation.
*
* For more compatibility information, see: http://caniuse.com/
*/
/**
* Constructor
*
* @param {Map} opts Options:
* var options = {
* name: 'Store A' // A name for this store that acts as a unique identifier.
* // You need to set this if you're going to have multiple stores.
* domain: 'example.com', // Custom cookie domain
* expires: 168, // Cookie expiration in hours
* ready: function() {}, // Fires after repopulating cache
* size: 10, // WebSQL database size in megabytes
* version: '1.0' // Version for this store
* };
*
* @return {StickyStore} Returns an instantiated store object
*/
function StickyStore(opts) {
// Default options
if (!opts) opts = {};
if (!opts.domain) opts.domain = window.location.hostname;
if (!opts.expires) opts.expires = 24*7; // Cookie expiration in hours
if (!opts.name) opts.name = 'sticky';
if (!opts.size) opts.size = 5; // Size in MB
if (!opts.version) opts.version = '0.5'; // Version for DB
if (opts.ready && typeof opts.ready !== 'function') {
throw new Error('opts.ready callback must be a function');
}
this.opts = opts;
this.cache = {}; // Memory cache container object
this.db; // Indexed DB or Web SQL connection object
// Wrap localStorage and globalStorage
if (window.localStorage) {
this.storage = window.localStorage;
}
else if (window.globalStorage) {
this.storage = window.globalStorage[opts.domain];
}
// Needed to keep context in async methods
var store = this;
// Initialize IndexedDB and repopulate cache
if ('webkitIndexedDB' in window) {
window.indexedDB = window.webkitIndexedDB;
window.IDBTransaction = window.webkitIDBTransaction;
}
else if ('mozIndexedDB' in window) {
window.indexedDB = window.mozIndexedDB;
}
if (window.indexedDB) {
// Request DB
var request = window.indexedDB.open(opts.name, 'Sticky Offline Web Cache');
request.onsuccess = function(event) {
store.db = event.target.result;
// If version is different, we need to set version
// and create an object store
if (store.db.version != opts.version) {
var request = store.db.setVersion(opts.version);
request.onsuccess = function(event) {
// Create our object store for cached data
if (!store.db.objectStoreNames.contains('cache')) {
store.db.createObjectStore('cache');
}
opts.ready && opts.ready.call(store);
};
request.onerror = function(event) {
console.log('Sticky Error: ' + request.errorCode);
opts.ready && opts.ready.call(store);
};
}
else {
var objectStore = store.db.transaction('cache').objectStore('cache');
objectStore.openCursor().onsuccess = function(event) {
var cursor = event.target.result;
// Only load records for this specific store
if (cursor && cursor.key.indexOf(opts.name + opts.version) === 0) {
if (cursor.value.data.substr(0, 4) === 'J::O') {
try {
var item = JSON.parse(cursor.value.data.substr(4));
store.set(cursor.key, item);
}
catch (err) {
console.log('Sticky Error: ' + err);
}
}
else {
store.set(cursor.key, cursor.value.data);
}
cursor['continue']();
}
else {
opts.ready && opts.ready.call(store);
}
}
}
}
request.onerror = function(event) {
console.log('Sticky Error: ' + request.errorCode);
opts.ready && opts.ready.call(store);
}
}
// Initialize WebDB and repopulate cache
else if (window.openDatabase) {
// Try and open DB
try {
this.db = window.openDatabase(opts.name, '1.0.0', 'Sticky Offline Web Cache', (opts.size * 1024 * 1024));
if (this.db) {
this.db.transaction(function(tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS cache (key TEXT, data TEXT)');
// Repopulate cache container object with data stored in SQLite
tx.executeSql('SELECT * FROM cache', [], function(tx, results) {
if (results.rows.length > 0) {
for (var i=0; i<results.rows.length; i++) {
var record = results.rows.item(i);
// Only load records for this specific store
if (record['key'].indexOf(opts.name + opts.version) === 0) {
if (record['data'] && record['data'].substr(0, 4) === 'J::O') {
try {
var item = JSON.parse(record['data'].substr(4));
store.set(record['key'], item);
}
catch (err) {
console.log('Sticky Error: ' + err);
}
}
else {
store.set(record['key'], record['data']);
}
}
}
opts.ready && opts.ready.call(store);
}
else {
opts.ready && opts.ready.call(store);
}
});
});
}
}
catch (err) {
console.log('Sticky Warning: ' + err);
opts.ready && opts.ready.call(store);
}
}
else {
opts.ready && opts.ready.call(store);
}
};
/**
* Set
*
* @param String key
* @param Mixed value
* @param Function callback Optional. Called after async operations are completed.
*
* @return Mixed Returns reference to stored value or false for failure or error
*/
StickyStore.prototype.set = (function(key, item, callback) {
if (!item) return false;
if (callback && typeof callback !== 'function') {
throw new Error('Callback must be a function');
return false;
}
// Prefix key with store name/identifier
key = (this.opts.name + this.opts.version + key).replace(/[^\w]/gi, '');
var value;
var itemType = typeof item;
// Store item in memory cache
this.cache[key] = item;
// Objects and arrays are stringified, and aren't stored in cookies (they're too big)
if (itemType === 'object' || itemType === 'array') {
try {
value = 'J::O' + JSON.stringify(item);
}
catch (err) {
console.log('Sticky Error: ' + err);
}
}
else if (itemType === 'string') {
value = item;
}
if (value) {
// Only string values less than 128 characters get stored in cookies
if (value.length < 128) {
document.cookie = key + '=' + value
+ '; expires=' + new Date(new Date().getTime() + (this.opts.expires*60*60*1000)).toGMTString()
+ '; path=/';
}
// Copy value to localStorage or globalStorage
if (this.storage) {
try {
this.storage.setItem(key, value);
}
catch (err) {
console.log('Sticky Error: ' + err);
}
}
if (this.db) {
var store = this; // Context for callback
if (this.db.setVersion) {
// Copy value to indexedDB
var tx = this.db.transaction(['cache'], IDBTransaction.READ_WRITE, 0);
var objStore = tx.objectStore('cache');
var obj = {'key':key, 'value':value};
var request = objStore.put(obj);
request.onsuccess = function(e) {
callback && callback.call(store, item);
};
request.onerror = function(e) {
callback && callback.call(store, false);
};
}
// Copy value to webDB
else {
// Insert callback after update
var insert = function(tx, error) {
// If update failed then insert
if (error && error.rowsAffected === 0) {
tx.executeSql('INSERT INTO cache (key, data) VALUES (?, ?)', [key, value], function(tx, rs) {
callback && callback.call(store, item);
});
}
else {
callback && callback.call(store, item);
}
}
// Update, and pass insert as callback
var update = function(tx) {
tx.executeSql('UPDATE cache SET data=? WHERE key=?', [value, key], insert);
}
this.db.transaction(update);
}
}
else {
callback && callback.call(this, item);
}
return this.cache[key];
}
return false;
});
/**
* Get
*
* @param String key
* @param Mixed default/callback Optional. Anything but a function will be used as the default return falue.
*
* @return Mixed Returns reference to stored value or false for failure or error
*/
StickyStore.prototype.get = (function(key, callback) {
var _default = null;
// Prefix key with store name
key = (this.opts.name + this.opts.version + key).replace(/[^\w]/gi, '');
// Not in memory, let's check elsewhere
if (!this.cache[key]) {
// Check localStorage or globalStorage
if (this.storage) {
var value = this.storage.getItem(key);
if (value && value.substr(0, 4) === 'J::O') {
value = JSON.parse(value.substr(4));
}
this.cache[key] = value;
}
// If not, check cookies
else {
var keyEquals = key + "=";
var cookieArray = document.cookie.split(';');
for (var i=0; i<cookieArray.length; i++) {
var cookie = cookieArray[i];
while (cookie.charAt(0) === ' ') {
cookie = cookie.substring(1, cookie.length);
}
if (cookie.indexOf(keyEquals) === 0) {
this.cache[key] = cookie.substring(keyEquals.length, cookie.length);
}
}
}
}
// Callback
if (callback) {
if (typeof callback === 'function') {
callback.call(this, this.cache[key]);
}
else {
_default = callback;
}
}
// Data inside webDB is loaded into the store on instantiation,
// so it's available here.
if (this.cache[key]) {
return this.cache[key];
}
// Not found
return _default;
});
/**
* Remove
*
* @param String key
* @param Function callback Optional. Executed after async operations are complete.
*
* @returns Bolean
*/
StickyStore.prototype.remove = (function(key, callback) {
if (callback && typeof callback !== 'function') {
throw new Error('Callback must be a function');
return false;
}
// Prefix key with store name
key = (this.opts.name + this.opts.version + key).replace(/[^\w]/gi, '');
// Remove from memory
if (this.cache[key]) {
delete this.cache[key];
}
// Remove cookie
document.cookie = key + '=; expires=-1; path=/';
// Remove localStorage or globalStorage
if (this.storage) {
try {
this.storage.removeItem(key);
}
catch (err) {
console.log('Sticky Error: ' + err);
return false;
}
}
if (this.db) {
// Keep context for callback
var store = this;
// Remove indexedDB
if (this.db.setVersion) {
// Copy value to indexedDB
var tx = this.db.transaction(['cache'], IDBTransaction.READ_WRITE, 0);
var objStore = tx.objectStore('cache');
var request = objStore['delete'](key);
request.onsuccess = function(e) {
callback && callback.call(store, true);
};
request.onerror = function(e) {
callback && callback.call(store, false);
};
}
// Remove web SQL
else {
this.db.transaction(function(tx) {
tx.executeSql('DELETE FROM cache WHERE key=?', [key], function(tx, rs) {;
callback && callback.call(store);
});
});
}
}
else {
callback && callback.call(this);
}
return true;
});
/**
* Remove All
*
* @param Function callback Optional
*
* Removes all values in this store from all storage mechanisms
*/
StickyStore.prototype.removeAll = (function(callback) {
var store = this;
for (var key in store.cache) {
store.remove(key);
}
if (callback && typeof callback === 'function') {
callback.call(this, this.cache[key]);
}
});