bulk move of code to src/ SERVER-4551

1 files changed, 83 insertions, 0 deletions

diff --git a/src/mongo/db/pipeline/document_source_limit.cpp b/src/mongo/db/pipeline/document_source_limit.cpp
new file mode 100644
index 00000000000..a73d4da2005
--- /dev/null
+++ b/src/mongo/db/pipeline/document_source_limit.cpp
@@ -0,0 +1,83 @@
+/**
+*    Copyright (C) 2011 10gen Inc.
+*
+*    This program is free software: you can redistribute it and/or  modify
+*    it under the terms of the GNU Affero General Public License, version 3,
+*    as published by the Free Software Foundation.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU Affero General Public License for more details.
+*
+*    You should have received a copy of the GNU Affero General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "pch.h"
+
+#include "db/pipeline/document_source.h"
+
+#include "db/jsobj.h"
+#include "db/pipeline/document.h"
+#include "db/pipeline/expression.h"
+#include "db/pipeline/expression_context.h"
+#include "db/pipeline/value.h"
+
+namespace mongo {
+    const char DocumentSourceLimit::limitName[] = "$limit";
+
+    DocumentSourceLimit::DocumentSourceLimit(const intrusive_ptr<ExpressionContext> &pTheCtx):
+        limit(0),
+        count(0),
+        pCtx(pTheCtx) {
+    }
+
+    DocumentSourceLimit::~DocumentSourceLimit() {
+    }
+
+    bool DocumentSourceLimit::eof() {
+        return pSource->eof() || count >= limit;
+    }
+
+    bool DocumentSourceLimit::advance() {
+        ++count;
+        if (count >= limit) {
+            pCurrent.reset();
+            return false;
+        }
+        pCurrent = pSource->getCurrent();
+        return pSource->advance();
+    }
+
+    intrusive_ptr<Document> DocumentSourceLimit::getCurrent() {
+        return pSource->getCurrent();
+    }
+
+    void DocumentSourceLimit::sourceToBson(BSONObjBuilder *pBuilder) const {
+	pBuilder->append("$limit", limit);
+    }
+
+    intrusive_ptr<DocumentSourceLimit> DocumentSourceLimit::create(
+	const intrusive_ptr<ExpressionContext> &pCtx) {
+        intrusive_ptr<DocumentSourceLimit> pSource(
+            new DocumentSourceLimit(pCtx));
+        return pSource;
+    }
+
+    intrusive_ptr<DocumentSource> DocumentSourceLimit::createFromBson(
+	BSONElement *pBsonElement,
+	const intrusive_ptr<ExpressionContext> &pCtx) {
+	uassert(15957, "the limit must be specified as a number",
+		pBsonElement->isNumber());
+
+        intrusive_ptr<DocumentSourceLimit> pLimit(
+	    DocumentSourceLimit::create(pCtx));
+
+        pLimit->limit = (int)pBsonElement->numberLong();
+	uassert(15958, "the limit must be positive",
+		pLimit->limit > 0);
+
+        return pLimit;
+    }
+}