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author | dgrogan@chromium.org <dgrogan@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-04-19 23:11:15 +0000 |
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committer | dgrogan@chromium.org <dgrogan@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529> | 2011-04-19 23:11:15 +0000 |
commit | 69c6d38342a1fab5f7f2921aa2e9c0e60ba90e35 (patch) | |
tree | bea96813c653d9e32277cb86cb517ddd90d0595c /table/block_builder.h | |
parent | b743906eeabc925f3e824d91a9747012bf249e2f (diff) | |
download | leveldb-69c6d38342a1fab5f7f2921aa2e9c0e60ba90e35.tar.gz |
reverting disastrous MOE commit, returning to r21
git-svn-id: https://leveldb.googlecode.com/svn/trunk@23 62dab493-f737-651d-591e-8d6aee1b9529
Diffstat (limited to 'table/block_builder.h')
-rw-r--r-- | table/block_builder.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/table/block_builder.h b/table/block_builder.h new file mode 100644 index 0000000..bf92a0f --- /dev/null +++ b/table/block_builder.h @@ -0,0 +1,57 @@ +// 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_BLOCK_BUILDER_H_ +#define STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_ + +#include <vector> + +#include <stdint.h> +#include "leveldb/slice.h" + +namespace leveldb { + +struct Options; + +class BlockBuilder { + public: + explicit BlockBuilder(const Options* options); + + // Reset the contents as if the BlockBuilder was just constructed. + void Reset(); + + // REQUIRES: Finish() has not been callled since the last call to Reset(). + // REQUIRES: key is larger than any previously added key + void Add(const Slice& key, const Slice& value); + + // Finish building the block and return a slice that refers to the + // block contents. The returned slice will remain valid for the + // lifetime of this builder or until Reset() is called. + Slice Finish(); + + // Returns an estimate of the current (uncompressed) size of the block + // we are building. + size_t CurrentSizeEstimate() const; + + // Return true iff no entries have been added since the last Reset() + bool empty() const { + return buffer_.empty(); + } + + private: + const Options* options_; + std::string buffer_; // Destination buffer + std::vector<uint32_t> restarts_; // Restart points + int counter_; // Number of entries emitted since restart + bool finished_; // Has Finish() been called? + std::string last_key_; + + // No copying allowed + BlockBuilder(const BlockBuilder&); + void operator=(const BlockBuilder&); +}; + +} + +#endif // STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_ |