mirror of https://gitee.com/bigwinds/arangodb
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_SHORT_STRING_STORAGE_H
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#define ARANGOD_AQL_SHORT_STRING_STORAGE_H 1
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#include "Basics/Common.h"
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namespace arangodb {
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namespace aql {
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struct ResourceMonitor;
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class ShortStringStorage {
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public:
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ShortStringStorage(ShortStringStorage const&) = delete;
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ShortStringStorage& operator=(ShortStringStorage const&) = delete;
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ShortStringStorage(ResourceMonitor*, size_t);
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~ShortStringStorage();
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/// @brief register a short string
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char* registerString(char const* p, size_t length);
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/// @brief register a short string, unescaping it
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char* unescape(char const* p, size_t length, size_t* outLength);
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private:
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/// @brief allocate a new block of memory
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void allocateBlock();
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public:
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/// @brief maximum length of strings in short string storage
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static constexpr size_t maxStringLength = 127;
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private:
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ResourceMonitor* _resourceMonitor;
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/// @brief already allocated string blocks
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std::vector<char*> _blocks;
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/// @brief size of each block
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size_t const _blockSize;
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/// @brief offset into current block
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char* _current;
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/// @brief end of current block
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char* _end;
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};
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} // namespace aql
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} // namespace arangodb
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#endif
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