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diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/read_preference.js b/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/read_preference.js
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+++ b/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/read_preference.js
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+"use strict";
+
+var needSlaveOk = ['primaryPreferred', 'secondary', 'secondaryPreferred', 'nearest'];
+
+/**
+ * @fileOverview The **ReadPreference** class is a class that represents a MongoDB ReadPreference and is
+ * used to construct connections.
+ *
+ * @example
+ * var ReplSet = require('mongodb-core').ReplSet
+ *   , ReadPreference = require('mongodb-core').ReadPreference
+ *   , assert = require('assert');
+ *
+ * var server = new ReplSet([{host: 'localhost', port: 30000}], {setName: 'rs'});
+ * // Wait for the connection event
+ * server.on('connect', function(server) {
+ *   var cursor = server.cursor('db.test'
+ *     , {find: 'db.test', query: {}}
+ *     , {readPreference: new ReadPreference('secondary')});
+ *   cursor.next(function(err, doc) {
+ *     server.destroy();
+ *   });
+ * });
+ *
+ * // Start connecting
+ * server.connect();
+ */
+
+/**
+ * Creates a new Pool instance
+ * @class
+ * @param {string} preference A string describing the preference (primary|primaryPreferred|secondary|secondaryPreferred|nearest)
+ * @param {array} tags The tags object
+ * @param {object} [options] Additional read preference options
+ * @param {number} [options.maxStalenessSeconds] Max Secondary Read Stalleness in Seconds, Minimum value is 90 seconds.
+ * @property {string} preference The preference string (primary|primaryPreferred|secondary|secondaryPreferred|nearest)
+ * @property {array} tags The tags object
+ * @property {object} options Additional read preference options
+ * @property {number} maxStalenessSeconds MaxStalenessSeconds value for the read preference
+ * @return {ReadPreference}
+ */
+var ReadPreference = function(preference, tags, options) {
+  this.preference = preference;
+  this.tags = tags;
+  this.options = options;
+
+  // Add the maxStalenessSeconds value to the read Preference
+  if(this.options && this.options.maxStalenessSeconds != null) {
+    this.options = options;
+    this.maxStalenessSeconds = this.options.maxStalenessSeconds >= 0
+      ? this.options.maxStalenessSeconds : null;
+  } else if(tags && typeof tags == 'object') {
+    this.options = tags, tags = null;
+  }
+}
+
+/**
+ * This needs slaveOk bit set
+ * @method
+ * @return {boolean}
+ */
+ReadPreference.prototype.slaveOk = function() {
+  return needSlaveOk.indexOf(this.preference) != -1;
+}
+
+/**
+ * Are the two read preference equal
+ * @method
+ * @return {boolean}
+ */
+ReadPreference.prototype.equals = function(readPreference) {
+  return readPreference.preference == this.preference;
+}
+
+/**
+ * Return JSON representation
+ * @method
+ * @return {Object}
+ */
+ReadPreference.prototype.toJSON = function() {
+  var readPreference = {mode: this.preference};
+  if(Array.isArray(this.tags)) readPreference.tags = this.tags;
+  if(this.maxStalenessSeconds) readPreference.maxStalenessSeconds = this.maxStalenessSeconds;
+  return readPreference;
+}
+
+/**
+ * Primary read preference
+ * @method
+ * @return {ReadPreference}
+ */
+ReadPreference.primary = new ReadPreference('primary');
+/**
+ * Primary Preferred read preference
+ * @method
+ * @return {ReadPreference}
+ */
+ReadPreference.primaryPreferred = new ReadPreference('primaryPreferred');
+/**
+ * Secondary read preference
+ * @method
+ * @return {ReadPreference}
+ */
+ReadPreference.secondary = new ReadPreference('secondary');
+/**
+ * Secondary Preferred read preference
+ * @method
+ * @return {ReadPreference}
+ */
+ReadPreference.secondaryPreferred = new ReadPreference('secondaryPreferred');
+/**
+ * Nearest read preference
+ * @method
+ * @return {ReadPreference}
+ */
+ReadPreference.nearest = new ReadPreference('nearest');
+
+module.exports = ReadPreference;