/
ReadPreference.js
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/
ReadPreference.js
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// Copyright 2015 rain1017.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
/* jshint ignore:start */
/*!
* Module dependencies.
*/
var mongodb = require('mongodb');
var ReadPref = mongodb.ReadPreference;
/*!
* Converts arguments to ReadPrefs the driver
* can understand.
*
* @param {String|Array} pref
* @param {Array} [tags]
*/
module.exports = function readPref (pref, tags) {
if (Array.isArray(pref)) {
tags = pref[1];
pref = pref[0];
}
if (pref instanceof ReadPref) {
return pref;
}
switch (pref) {
case 'p':
pref = 'primary';
break;
case 'pp':
pref = 'primaryPreferred';
break;
case 's':
pref = 'secondary';
break;
case 'sp':
pref = 'secondaryPreferred';
break;
case 'n':
pref = 'nearest';
break;
}
return new ReadPref(pref, tags);
}