btree access method, cursor. migrate btreecursor to use it. SERVER-9163 SERVER-8791

1 files changed, 52 insertions, 0 deletions

diff --git a/src/mongo/db/index/btree_access_method.h b/src/mongo/db/index/btree_access_method.h
new file mode 100644
index 00000000000..96f67e71e59
--- /dev/null
+++ b/src/mongo/db/index/btree_access_method.h
@@ -0,0 +1,52 @@
+/**
+*    Copyright (C) 2013 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 <boost/scoped_ptr.hpp>
+
+#include "mongo/base/status.h"
+#include "mongo/db/btree.h"
+#include "mongo/db/index/index_access_method.h"
+#include "mongo/db/index/btree_key_generator.h"
+#include "mongo/db/index/btree_access_method_internal.h"
+#include "mongo/db/jsobj.h"
+
+namespace mongo {
+
+    class IndexCursor;
+    class IndexDescriptor;
+
+    template <class Key> class BtreeAccessMethod : public BtreeBasedAccessMethod<Key> {
+    public:
+        using BtreeBasedAccessMethod<Key>::_descriptor;
+        using BtreeBasedAccessMethod<Key>::_ordering;
+
+        BtreeAccessMethod(IndexDescriptor* descriptor);
+        virtual ~BtreeAccessMethod() { }
+
+        virtual Status newCursor(IndexCursor** out);
+
+        // TODO(hk): Keep bucket deletion internal to this class.
+
+    private:
+        virtual void getKeys(const BSONObj& obj, BSONObjSet* keys);
+
+        // Our keys differ for V0 and V1.
+        scoped_ptr<BtreeKeyGenerator> _keyGenerator;
+    };
+
+}  // namespace mongo