collocatordb: start for a rocksdb-based collocator db
diff --git a/merge_operators.h b/merge_operators.h
new file mode 100644
index 0000000..602a4d0
--- /dev/null
+++ b/merge_operators.h
@@ -0,0 +1,51 @@
+// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
+// This source code is licensed under both the GPLv2 (found in the
+// COPYING file in the root directory) and Apache 2.0 License
+// (found in the LICENSE.Apache file in the root directory).
+//
+#ifndef MERGE_OPERATORS_H
+#define MERGE_OPERATORS_H
+
+#include <memory>
+#include <stdio.h>
+
+#include "rocksdb/merge_operator.h"
+
+namespace rocksdb {
+
+class MergeOperators {
+ public:
+ static std::shared_ptr<MergeOperator> CreatePutOperator();
+ static std::shared_ptr<MergeOperator> CreateDeprecatedPutOperator();
+ static std::shared_ptr<MergeOperator> CreateUInt64AddOperator();
+ static std::shared_ptr<MergeOperator> CreateStringAppendOperator();
+ static std::shared_ptr<MergeOperator> CreateStringAppendTESTOperator();
+ static std::shared_ptr<MergeOperator> CreateMaxOperator();
+
+ // Will return a different merge operator depending on the string.
+ // TODO: Hook the "name" up to the actual Name() of the MergeOperators?
+ static std::shared_ptr<MergeOperator> CreateFromStringId(
+ const std::string& name) {
+ if (name == "put") {
+ return CreatePutOperator();
+ } else if (name == "put_v1") {
+ return CreateDeprecatedPutOperator();
+ } else if ( name == "uint64add") {
+ return CreateUInt64AddOperator();
+ } else if (name == "stringappend") {
+ return CreateStringAppendOperator();
+ } else if (name == "stringappendtest") {
+ return CreateStringAppendTESTOperator();
+ } else if (name == "max") {
+ return CreateMaxOperator();
+ } else {
+ // Empty or unknown, just return nullptr
+ return nullptr;
+ }
+ }
+
+};
+
+} // namespace rocksdb
+
+#endif