SERVER-8173: add a new IndexPathSet class to make checking if a mod will udpate index more reliable

1 files changed, 45 insertions, 0 deletions

diff --git a/src/mongo/db/index_set.h b/src/mongo/db/index_set.h
new file mode 100644
index 00000000000..51e941c2033
--- /dev/null
+++ b/src/mongo/db/index_set.h
@@ -0,0 +1,45 @@
+// index_set.h
+
+/**
+*    Copyright (C) 2008 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/>.
+*/
+
+#pragma once
+
+#include <vector>
+
+#include "mongo/base/string_data.h"
+
+namespace mongo {
+
+    /**
+     * a.$ -> a
+     * @return true if out is set and we made a change
+     */
+    bool getCanonicalIndexField( const StringData& fullName, std::string* out );
+
+    class IndexPathSet {
+    public:
+        void addPath( const StringData& path );
+
+        void clear();
+
+        bool mightBeIndexed( const StringData& path ) const;
+
+    private:
+        std::vector<std::string> _canonical;
+    };
+
+}