From 686106d544ecc3b6ffd4db2b665d3bc879a58d8c Mon Sep 17 00:00:00 2001
From: Jules Laplace <jules@okfoc.us>
Date: Mon, 24 Sep 2012 16:22:07 -0400
Subject: ok

---
 node_modules/mongoose/lib/querystream.js | 179 +++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)
 create mode 100644 node_modules/mongoose/lib/querystream.js

(limited to 'node_modules/mongoose/lib/querystream.js')

diff --git a/node_modules/mongoose/lib/querystream.js b/node_modules/mongoose/lib/querystream.js
new file mode 100644
index 0000000..4093e60
--- /dev/null
+++ b/node_modules/mongoose/lib/querystream.js
@@ -0,0 +1,179 @@
+
+/**
+ * Module dependencies.
+ */
+
+var Stream = require('stream').Stream
+var utils = require('./utils')
+
+/**
+ * QueryStream
+ *
+ * Returns a stream interface for the `query`.
+ *
+ * @param {Query} query
+ * @return {Stream}
+ */
+
+function QueryStream (query) {
+  Stream.call(this);
+
+  this.query = query;
+  this.readable = true;
+  this.paused = false;
+  this._cursor = null;
+  this._destroyed = null;
+  this._fields = null;
+  this._ticks = 0;
+
+  // give time to hook up events
+  var self = this;
+  process.nextTick(function () {
+    self._init();
+  });
+}
+
+/**
+ * Inherit from Stream
+ * @private
+ */
+
+QueryStream.prototype.__proto__ = Stream.prototype;
+
+/**
+ * Flag stating whether or not this stream is readable.
+ */
+
+QueryStream.prototype.readable;
+
+/**
+ * Flag stating whether or not this stream is paused.
+ */
+
+QueryStream.prototype.paused;
+
+/**
+ * Initialize the query.
+ * @private
+ */
+
+QueryStream.prototype._init = function () {
+  if (this._destroyed) return;
+
+  var query = this.query
+    , model = query.model
+    , options = query._optionsForExec(model)
+    , self = this
+
+  try {
+    query.cast(model);
+  } catch (err) {
+    return self.destroy(err);
+  }
+
+  self._fields = utils.clone(options.fields = query._fields);
+
+  model.collection.find(query._conditions, options, function (err, cursor) {
+    if (err) return self.destroy(err);
+    self._cursor = cursor;
+    self._next();
+  });
+}
+
+/**
+ * Pull the next document from the cursor.
+ * @private
+ */
+
+QueryStream.prototype._next = function () {
+  if (this.paused || this._destroyed) return;
+
+  var self = this;
+
+  // nextTick is necessary to avoid stack overflows when
+  // dealing with large result sets. yield occasionally.
+  if (!(++this._ticks % 20)) {
+    process.nextTick(function () {
+      self._cursor.nextObject(function (err, doc) {
+        self._onNextObject(err, doc);
+      });
+    });
+  } else {
+    self._cursor.nextObject(function (err, doc) {
+      self._onNextObject(err, doc);
+    });
+  }
+}
+
+/**
+ * Handle each document as its returned from the cursor
+ * transforming the raw `doc` from -native into a model
+ * instance.
+ *
+ * @private
+ */
+
+QueryStream.prototype._onNextObject = function (err, doc) {
+  if (err) return this.destroy(err);
+
+  // when doc is null we hit the end of the cursor
+  if (!doc) {
+    return this.destroy();
+  }
+
+  var instance = new this.query.model(undefined, this._fields);
+
+  // skip _id for pre-init hooks
+  delete instance._doc._id;
+
+  var self = this;
+  instance.init(doc, this.query, function (err) {
+    if (err) return self.destroy(err);
+    self.emit('data', instance);
+    self._next();
+  });
+}
+
+/**
+ * Pauses this stream.
+ */
+
+QueryStream.prototype.pause = function () {
+  this.paused = true;
+}
+
+/**
+ * Resumes this stream.
+ */
+
+QueryStream.prototype.resume = function () {
+  this.paused = false;
+  this._next();
+}
+
+/**
+ * Destroys the stream, closing the underlying
+ * cursor. No more events will be emitted.
+ */
+
+QueryStream.prototype.destroy = function (err) {
+  if (this._destroyed) return;
+  this._destroyed = true;
+  this.readable = false;
+
+  if (this._cursor) {
+    this._cursor.close();
+  }
+
+  if (err) {
+    this.emit('error', err);
+  }
+
+  this.emit('close');
+}
+
+// TODO - maybe implement the -native raw option to pass binary?
+//QueryStream.prototype.setEncoding = function () {
+//}
+
+module.exports = exports = QueryStream;
-- 
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