mirror of https://gitee.com/bigwinds/arangodb
89 lines
2.7 KiB
C++
89 lines
2.7 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_QUERY_RESOURCES_H
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#define ARANGOD_AQL_QUERY_RESOURCES_H 1
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#include "Aql/ShortStringStorage.h"
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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 AstNode;
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struct ResourceMonitor;
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class QueryResources {
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public:
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QueryResources() = delete;
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QueryResources(QueryResources const&) = delete;
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QueryResources& operator=(QueryResources const&) = delete;
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explicit QueryResources(ResourceMonitor*);
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~QueryResources();
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/// @brief add a node to the list of nodes
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void addNode(AstNode*);
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/// @brief register a string
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/// the string is freed when the query is destroyed
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char* registerString(char const* p, size_t length);
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/// @brief register a string
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/// the string is freed when the query is destroyed
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char* registerString(std::string const& p) {
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return registerString(p.data(), p.size());
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}
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/// @brief register a potentially UTF-8-escaped string
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/// the string is freed when the query is destroyed
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char* registerEscapedString(char const* p, size_t length, size_t& outLength);
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private:
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/// @brief registers a long string and takes over the ownership for it
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char* registerLongString(char* copy, size_t length);
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private:
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ResourceMonitor* _resourceMonitor;
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/// @brief all nodes created in the AST - will be used for freeing them later
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std::vector<AstNode*> _nodes;
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/// @brief strings created in the query - used for easy memory deallocation
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std::vector<char*> _strings;
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/// @brief cumulated length of strings in _strings
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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size_t _stringsLength;
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#endif
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/// @brief short string storage. uses less memory allocations for short
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/// strings
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ShortStringStorage _shortStringStorage;
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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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