var IndexedDB = require('./indexeddb.js');
var WebSQL = require('./websql.js');
var Memory = require('./memory.js');

module.exports = {
  IndexedDB: IndexedDB,
  WebSQL: WebSQL,
  Memory: Memory,

  /**
   * Convenience Provider references
   */

  // The default provider to use when none is specified
  Default: IndexedDB,

  // The Fallback provider does automatic fallback checks
  Fallback: (function() {
    if(IndexedDB.isSupported()) {
      return IndexedDB;
    }

    if(WebSQL.isSupported()) {
      return WebSQL;
    }

    function NotSupported() {
      throw "[Filer Error] Your browser doesn't support IndexedDB or WebSQL.";
    }
    NotSupported.isSupported = function() {
      return false;
    };
    return NotSupported;
  }())
};