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+"use strict";
+
+var inherits = require('util').inherits
+ , MongoError = require('mongodb-core').MongoError
+ , Readable = require('stream').Readable || require('readable-stream').Readable
+ , Define = require('./metadata')
+ , CoreCursor = require('./cursor');
+
+/**
+ * @fileOverview The **AggregationCursor** class is an internal class that embodies an aggregation cursor on MongoDB
+ * allowing for iteration over the results returned from the underlying query. It supports
+ * one by one document iteration, conversion to an array or can be iterated as a Node 0.10.X
+ * or higher stream
+ *
+ * **AGGREGATIONCURSOR Cannot directly be instantiated**
+ * @example
+ * var MongoClient = require('mongodb').MongoClient,
+ * test = require('assert');
+ * // Connection url
+ * var url = 'mongodb://localhost:27017/test';
+ * // Connect using MongoClient
+ * MongoClient.connect(url, function(err, db) {
+ * // Create a collection we want to drop later
+ * var col = db.collection('createIndexExample1');
+ * // Insert a bunch of documents
+ * col.insert([{a:1, b:1}
+ * , {a:2, b:2}, {a:3, b:3}
+ * , {a:4, b:4}], {w:1}, function(err, result) {
+ * test.equal(null, err);
+ * // Show that duplicate records got dropped
+ * col.aggregation({}, {cursor: {}}).toArray(function(err, items) {
+ * test.equal(null, err);
+ * test.equal(4, items.length);
+ * db.close();
+ * });
+ * });
+ * });
+ */
+
+/**
+ * Namespace provided by the browser.
+ * @external Readable
+ */
+
+/**
+ * Creates a new Aggregation Cursor instance (INTERNAL TYPE, do not instantiate directly)
+ * @class AggregationCursor
+ * @extends external:Readable
+ * @fires AggregationCursor#data
+ * @fires AggregationCursor#end
+ * @fires AggregationCursor#close
+ * @fires AggregationCursor#readable
+ * @return {AggregationCursor} an AggregationCursor instance.
+ */
+var AggregationCursor = function(bson, ns, cmd, options, topology, topologyOptions) {
+ CoreCursor.apply(this, Array.prototype.slice.call(arguments, 0));
+ var state = AggregationCursor.INIT;
+ var streamOptions = {};
+
+ // MaxTimeMS
+ var maxTimeMS = null;
+
+ // Get the promiseLibrary
+ var promiseLibrary = options.promiseLibrary;
+
+ // No promise library selected fall back
+ if(!promiseLibrary) {
+ promiseLibrary = typeof global.Promise == 'function' ?
+ global.Promise : require('es6-promise').Promise;
+ }
+
+ // Set up
+ Readable.call(this, {objectMode: true});
+
+ // Internal state
+ this.s = {
+ // MaxTimeMS
+ maxTimeMS: maxTimeMS
+ // State
+ , state: state
+ // Stream options
+ , streamOptions: streamOptions
+ // BSON
+ , bson: bson
+ // Namespae
+ , ns: ns
+ // Command
+ , cmd: cmd
+ // Options
+ , options: options
+ // Topology
+ , topology: topology
+ // Topology Options
+ , topologyOptions: topologyOptions
+ // Promise library
+ , promiseLibrary: promiseLibrary
+ }
+}
+
+/**
+ * AggregationCursor stream data event, fired for each document in the cursor.
+ *
+ * @event AggregationCursor#data
+ * @type {object}
+ */
+
+/**
+ * AggregationCursor stream end event
+ *
+ * @event AggregationCursor#end
+ * @type {null}
+ */
+
+/**
+ * AggregationCursor stream close event
+ *
+ * @event AggregationCursor#close
+ * @type {null}
+ */
+
+/**
+ * AggregationCursor stream readable event
+ *
+ * @event AggregationCursor#readable
+ * @type {null}
+ */
+
+// Inherit from Readable
+inherits(AggregationCursor, Readable);
+
+// Extend the Cursor
+for(var name in CoreCursor.prototype) {
+ AggregationCursor.prototype[name] = CoreCursor.prototype[name];
+}
+
+var define = AggregationCursor.define = new Define('AggregationCursor', AggregationCursor, true);
+
+/**
+ * Set the batch size for the cursor.
+ * @method
+ * @param {number} value The batchSize for the cursor.
+ * @throws {MongoError}
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.batchSize = function(value) {
+ if(this.s.state == AggregationCursor.CLOSED || this.isDead()) throw MongoError.create({message: "Cursor is closed", driver:true });
+ if(typeof value != 'number') throw MongoError.create({message: "batchSize requires an integer", drvier:true });
+ if(this.s.cmd.cursor) this.s.cmd.cursor.batchSize = value;
+ this.setCursorBatchSize(value);
+ return this;
+}
+
+define.classMethod('batchSize', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a geoNear stage to the aggregation pipeline
+ * @method
+ * @param {object} document The geoNear stage document.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.geoNear = function(document) {
+ this.s.cmd.pipeline.push({$geoNear: document});
+ return this;
+}
+
+define.classMethod('geoNear', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a group stage to the aggregation pipeline
+ * @method
+ * @param {object} document The group stage document.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.group = function(document) {
+ this.s.cmd.pipeline.push({$group: document});
+ return this;
+}
+
+define.classMethod('group', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a limit stage to the aggregation pipeline
+ * @method
+ * @param {number} value The state limit value.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.limit = function(value) {
+ this.s.cmd.pipeline.push({$limit: value});
+ return this;
+}
+
+define.classMethod('limit', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a match stage to the aggregation pipeline
+ * @method
+ * @param {object} document The match stage document.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.match = function(document) {
+ this.s.cmd.pipeline.push({$match: document});
+ return this;
+}
+
+define.classMethod('match', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a maxTimeMS stage to the aggregation pipeline
+ * @method
+ * @param {number} value The state maxTimeMS value.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.maxTimeMS = function(value) {
+ if(this.s.topology.lastIsMaster().minWireVersion > 2) {
+ this.s.cmd.maxTimeMS = value;
+ }
+ return this;
+}
+
+define.classMethod('maxTimeMS', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a out stage to the aggregation pipeline
+ * @method
+ * @param {number} destination The destination name.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.out = function(destination) {
+ this.s.cmd.pipeline.push({$out: destination});
+ return this;
+}
+
+define.classMethod('out', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a project stage to the aggregation pipeline
+ * @method
+ * @param {object} document The project stage document.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.project = function(document) {
+ this.s.cmd.pipeline.push({$project: document});
+ return this;
+}
+
+define.classMethod('project', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a lookup stage to the aggregation pipeline
+ * @method
+ * @param {object} document The lookup stage document.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.lookup = function(document) {
+ this.s.cmd.pipeline.push({$lookup: document});
+ return this;
+}
+
+define.classMethod('lookup', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a redact stage to the aggregation pipeline
+ * @method
+ * @param {object} document The redact stage document.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.redact = function(document) {
+ this.s.cmd.pipeline.push({$redact: document});
+ return this;
+}
+
+define.classMethod('redact', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a skip stage to the aggregation pipeline
+ * @method
+ * @param {number} value The state skip value.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.skip = function(value) {
+ this.s.cmd.pipeline.push({$skip: value});
+ return this;
+}
+
+define.classMethod('skip', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a sort stage to the aggregation pipeline
+ * @method
+ * @param {object} document The sort stage document.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.sort = function(document) {
+ this.s.cmd.pipeline.push({$sort: document});
+ return this;
+}
+
+define.classMethod('sort', {callback: false, promise:false, returns: [AggregationCursor]});
+
+/**
+ * Add a unwind stage to the aggregation pipeline
+ * @method
+ * @param {number} field The unwind field name.
+ * @return {AggregationCursor}
+ */
+AggregationCursor.prototype.unwind = function(field) {
+ this.s.cmd.pipeline.push({$unwind: field});
+ return this;
+}
+
+define.classMethod('unwind', {callback: false, promise:false, returns: [AggregationCursor]});
+
+AggregationCursor.prototype.get = AggregationCursor.prototype.toArray;
+
+// Inherited methods
+define.classMethod('toArray', {callback: true, promise:true});
+define.classMethod('each', {callback: true, promise:false});
+define.classMethod('forEach', {callback: true, promise:false});
+define.classMethod('next', {callback: true, promise:true});
+define.classMethod('close', {callback: true, promise:true});
+define.classMethod('isClosed', {callback: false, promise:false, returns: [Boolean]});
+define.classMethod('rewind', {callback: false, promise:false});
+define.classMethod('bufferedCount', {callback: false, promise:false, returns: [Number]});
+define.classMethod('readBufferedDocuments', {callback: false, promise:false, returns: [Array]});
+
+/**
+ * Get the next available document from the cursor, returns null if no more documents are available.
+ * @function AggregationCursor.prototype.next
+ * @param {AggregationCursor~resultCallback} [callback] The result callback.
+ * @throws {MongoError}
+ * @return {Promise} returns Promise if no callback passed
+ */
+
+/**
+ * The callback format for results
+ * @callback AggregationCursor~toArrayResultCallback
+ * @param {MongoError} error An error instance representing the error during the execution.
+ * @param {object[]} documents All the documents the satisfy the cursor.
+ */
+
+/**
+ * Returns an array of documents. The caller is responsible for making sure that there
+ * is enough memory to store the results. Note that the array only contain partial
+ * results when this cursor had been previouly accessed. In that case,
+ * cursor.rewind() can be used to reset the cursor.
+ * @method AggregationCursor.prototype.toArray
+ * @param {AggregationCursor~toArrayResultCallback} [callback] The result callback.
+ * @throws {MongoError}
+ * @return {Promise} returns Promise if no callback passed
+ */
+
+/**
+ * The callback format for results
+ * @callback AggregationCursor~resultCallback
+ * @param {MongoError} error An error instance representing the error during the execution.
+ * @param {(object|null)} result The result object if the command was executed successfully.
+ */
+
+/**
+ * Iterates over all the documents for this cursor. As with **{cursor.toArray}**,
+ * not all of the elements will be iterated if this cursor had been previouly accessed.
+ * In that case, **{cursor.rewind}** can be used to reset the cursor. However, unlike
+ * **{cursor.toArray}**, the cursor will only hold a maximum of batch size elements
+ * at any given time if batch size is specified. Otherwise, the caller is responsible
+ * for making sure that the entire result can fit the memory.
+ * @method AggregationCursor.prototype.each
+ * @param {AggregationCursor~resultCallback} callback The result callback.
+ * @throws {MongoError}
+ * @return {null}
+ */
+
+/**
+ * Close the cursor, sending a AggregationCursor command and emitting close.
+ * @method AggregationCursor.prototype.close
+ * @param {AggregationCursor~resultCallback} [callback] The result callback.
+ * @return {Promise} returns Promise if no callback passed
+ */
+
+/**
+ * Is the cursor closed
+ * @method AggregationCursor.prototype.isClosed
+ * @return {boolean}
+ */
+
+/**
+ * Execute the explain for the cursor
+ * @method AggregationCursor.prototype.explain
+ * @param {AggregationCursor~resultCallback} [callback] The result callback.
+ * @return {Promise} returns Promise if no callback passed
+ */
+
+/**
+ * Clone the cursor
+ * @function AggregationCursor.prototype.clone
+ * @return {AggregationCursor}
+ */
+
+/**
+ * Resets the cursor
+ * @function AggregationCursor.prototype.rewind
+ * @return {AggregationCursor}
+ */
+
+/**
+ * The callback format for the forEach iterator method
+ * @callback AggregationCursor~iteratorCallback
+ * @param {Object} doc An emitted document for the iterator
+ */
+
+/**
+ * The callback error format for the forEach iterator method
+ * @callback AggregationCursor~endCallback
+ * @param {MongoError} error An error instance representing the error during the execution.
+ */
+
+/*
+ * Iterates over all the documents for this cursor using the iterator, callback pattern.
+ * @method AggregationCursor.prototype.forEach
+ * @param {AggregationCursor~iteratorCallback} iterator The iteration callback.
+ * @param {AggregationCursor~endCallback} callback The end callback.
+ * @throws {MongoError}
+ * @return {null}
+ */
+
+AggregationCursor.INIT = 0;
+AggregationCursor.OPEN = 1;
+AggregationCursor.CLOSED = 2;
+
+module.exports = AggregationCursor;