| // 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_LEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_ |
| #define STORAGE_LEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_ |
| |
| #include "leveldb/iterator.h" |
| |
| namespace leveldb { |
| |
| 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 leveldb |
| |
| #endif // STORAGE_LEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_ |