mirror of https://gitee.com/bigwinds/arangodb
139 lines
5.4 KiB
C++
139 lines
5.4 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 LIB_BASICS_JSON_UTILITIES_H
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#define LIB_BASICS_JSON_UTILITIES_H 1
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#include "Basics/Common.h"
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#include "Basics/json.h"
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////////////////////////////////////////////////////////////////////////////////
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/// @brief compare two json values
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///
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/// the values are first compared by their types, and only by their values if
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/// the types are the same
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/// returns -1 if lhs is smaller than rhs, 0 if lhs == rhs, and 1 if rhs is
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/// greater than lhs.
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///
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/// If useUTF8 is set to true, strings will be converted using proper UTF8,
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/// otherwise, strcmp is used, so it should only be used to test for equality
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/// in this case.
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////////////////////////////////////////////////////////////////////////////////
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int TRI_CompareValuesJson(TRI_json_t const*, TRI_json_t const*,
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bool useUTF8 = true);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief check if two json values are the same
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_CheckSameValueJson(TRI_json_t const*, TRI_json_t const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief uniquify a sorted json list into a new array
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///
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/// it is a prerequisite that the input list is already sorted.
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/// otherwise the result is unpredictable.
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////////////////////////////////////////////////////////////////////////////////
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TRI_json_t* TRI_UniquifyArrayJson(TRI_json_t const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sorts a json array in place
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////////////////////////////////////////////////////////////////////////////////
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TRI_json_t* TRI_SortArrayJson(TRI_json_t*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief checks if a JSON struct has duplicate attribute names
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_HasDuplicateKeyJson(TRI_json_t const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief merge two JSON documents into one
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////////////////////////////////////////////////////////////////////////////////
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TRI_json_t* TRI_MergeJson(TRI_memory_zone_t*, TRI_json_t const*,
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TRI_json_t const*, bool, bool);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief compute a hash value for a JSON document.
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////////////////////////////////////////////////////////////////////////////////
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uint64_t TRI_HashJson(TRI_json_t const* json);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief compute a hash value for a JSON document, using fasthash64.
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/// This is slightly faster than the FNV-based hashing
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////////////////////////////////////////////////////////////////////////////////
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uint64_t TRI_FastHashJson(TRI_json_t const* json);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief compute a hash value for a JSON document depending on a list
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/// of attributes.
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////////////////////////////////////////////////////////////////////////////////
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uint64_t TRI_HashJsonByAttributes(TRI_json_t const* json,
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char const* attributes[], int nrAttributes,
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bool docComplete, int* error);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief hasher for JSON value
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////////////////////////////////////////////////////////////////////////////////
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namespace arangodb {
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namespace basics {
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struct JsonHash {
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inline size_t operator()(TRI_json_t const* value) const {
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return TRI_FastHashJson(value);
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}
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief equality comparator for JSON values
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////////////////////////////////////////////////////////////////////////////////
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struct JsonEqual {
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inline bool operator()(TRI_json_t const* lhs, TRI_json_t const* rhs) const {
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return (TRI_CompareValuesJson(lhs, rhs, false) == 0);
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}
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief less comparator for JSON values
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////////////////////////////////////////////////////////////////////////////////
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template <bool useUtf8>
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struct JsonLess {
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inline bool operator()(TRI_json_t const* lhs, TRI_json_t const* rhs) const {
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return TRI_CompareValuesJson(lhs, rhs, useUtf8) < 0;
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}
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};
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}
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}
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#endif
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