function Cache() {
  this._store = {};
}

Cache.prototype.get = function(key) {
  key = this._serialize(key);
  return key in this._store ? this._store[key] : undefined;
};

Cache.prototype.set = function(key, value) {
  key = this._serialize(key);
  this._store[key] = value;
  return this;
};

Cache.prototype._serialize = function(mixedKey) {
  var json = JSON.stringify(mixedKey);
  return this._hash(json);
};

Cache.prototype._hash = function(str) {
  var hash = 0, i, chr, len;
  if (str.length === 0) return hash;
  for (i = 0, len = str.length; i < len; i++) {
    chr   = str.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; // Convert to 32bit integer
  }
  return hash;
};

module.exports = Cache;