Merge commit 'e8893e96780685b9e39447199d946739e565fef5' as 'src/hyperleveldb'

src/hyperleveldb/table/two_level_iterator.h

@@ -0,0 +1,34 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_HYPERLEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_
+#define STORAGE_HYPERLEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_
+
+#include "../hyperleveldb/iterator.h"
+
+namespace hyperleveldb {
+
+struct ReadOptions;
+
+// Return a new two level iterator.  A two-level iterator contains an
+// index iterator whose values point to a sequence of blocks where
+// each block is itself a sequence of key,value pairs.  The returned
+// two-level iterator yields the concatenation of all key/value pairs
+// in the sequence of blocks.  Takes ownership of "index_iter" and
+// will delete it when no longer needed.
+//
+// Uses a supplied function to convert an index_iter value into
+// an iterator over the contents of the corresponding block.
+extern Iterator* NewTwoLevelIterator(
+    Iterator* index_iter,
+    Iterator* (*block_function)(
+        void* arg,
+        const ReadOptions& options,
+        const Slice& index_value),
+    void* arg,
+    const ReadOptions& options);
+
+}  // namespace hyperleveldb
+
+#endif  // STORAGE_HYPERLEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_