/**
 * Module dependencies.
 */

var ObjectId = require('mongodb').BSONPure.ObjectID;

/**
 * Constructor export
 *
 * @api private
 */

var ObjectIdToString = ObjectId.toString.bind(ObjectId);

module.exports = exports = ObjectId;
/**
 * Creates an ObjectID for this driver
 *
 * @param {Object} hex string or ObjectId
 * @api private
 */

exports.fromString = function(str){
  // patch native driver bug in V0.9.6.4
  if (!('string' === typeof str && 24 === str.length)) {
    throw new Error("Invalid ObjectId");
  }

  return ObjectId.createFromHexString(str);
};

/**
 * Gets an ObjectId and converts it to string.
 *
 * @param {ObjectId} -native objectid
 * @api private
 */

exports.toString = function(oid){
  if (!arguments.length) return ObjectIdToString();
  return oid.toHexString();
};