mirror of https://gitee.com/bigwinds/arangodb
78 lines
2.6 KiB
C++
78 lines
2.6 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_REGEX_CACHE_H
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#define ARANGOD_AQL_REGEX_CACHE_H 1
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#include "Basics/Common.h"
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#include "Aql/AqlValue.h"
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#include <unicode/regex.h>
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namespace arangodb {
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namespace transaction {
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class Methods;
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}
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namespace aql {
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class RegexCache {
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public:
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RegexCache(RegexCache const&) = delete;
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RegexCache& operator=(RegexCache const&) = delete;
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RegexCache() = default;
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~RegexCache();
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void clear() noexcept;
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icu::RegexMatcher* buildRegexMatcher(char const* ptr, size_t length, bool caseInsensitive);
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icu::RegexMatcher* buildLikeMatcher(char const* ptr, size_t length, bool caseInsensitive);
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icu::RegexMatcher* buildSplitMatcher(AqlValue splitExpression, arangodb::transaction::Methods* trx, bool& isEmptyExpression);
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private:
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/// @brief clear the specified cache
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void clear(std::unordered_map<std::string, icu::RegexMatcher*>& cache) noexcept;
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/// @brief get matcher from cache, or insert a new matcher for the specified pattern
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icu::RegexMatcher* fromCache(std::string const& pattern,
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std::unordered_map<std::string, icu::RegexMatcher*>& cache);
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static void buildRegexPattern(std::string& out, char const* ptr, size_t length, bool caseInsensitive);
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static void buildLikePattern(std::string& out, char const* ptr, size_t length, bool caseInsensitive);
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private:
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/// @brief cache for compiled regexes (REGEX function)
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std::unordered_map<std::string, icu::RegexMatcher*> _regexCache;
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/// @brief cache for compiled regexes (LIKE function)
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std::unordered_map<std::string, icu::RegexMatcher*> _likeCache;
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/// @brief a reusable string object for pattern generation
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std::string _temp;
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};
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}
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}
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#endif
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