mirror of https://gitee.com/bigwinds/arangodb
121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief hash array implementation
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 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 Dr. Frank Celler
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/// @author Dr. Oreste Costa-Panaia
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/// @author Martin Schoenert
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2004-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "hash-array.h"
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#include "Basics/fasthash.h"
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#include "Indexes/HashIndex.h"
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#include "VocBase/document-collection.h"
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#include "VocBase/VocShaper.h"
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// -----------------------------------------------------------------------------
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// --SECTION-- COMPARISON
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief determines if a key corresponds to an element
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_hash_array_t::isEqualKeyElement (TRI_index_search_value_t const* left,
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TRI_index_element_t const* right) const {
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TRI_ASSERT_EXPENSIVE(right->document() != nullptr);
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for (size_t j = 0; j < _numFields; ++j) {
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TRI_shaped_json_t* leftJson = &left->_values[j];
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TRI_shaped_sub_t* rightSub = &right->subObjects()[j];
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if (leftJson->_sid != rightSub->_sid) {
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return false;
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}
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auto length = leftJson->_data.length;
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char const* rightData;
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size_t rightLength;
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TRI_InspectShapedSub(rightSub, right->document(), rightData, rightLength);
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if (length != rightLength) {
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return false;
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}
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if (length > 0 && memcmp(leftJson->_data.data, rightData, length) != 0) {
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return false;
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}
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}
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief given a key generates a hash integer
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////////////////////////////////////////////////////////////////////////////////
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uint64_t TRI_hash_array_t::hashKey (TRI_index_search_value_t const* key) const {
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uint64_t hash = 0x0123456789abcdef;
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for (size_t j = 0; j < _numFields; ++j) {
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// ignore the sid for hashing
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hash = fasthash64(key->_values[j]._data.data, key->_values[j]._data.length,
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hash);
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}
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return hash;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief given an element generates a hash integer
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////////////////////////////////////////////////////////////////////////////////
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uint64_t TRI_hash_array_t::hashElement (TRI_index_element_t const* element) const {
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uint64_t hash = 0x0123456789abcdef;
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for (size_t j = 0; j < _numFields; j++) {
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char const* data;
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size_t length;
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TRI_InspectShapedSub(&element->subObjects()[j], element->document(), data, length);
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// ignore the sid for hashing
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// only hash the data block
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hash = fasthash64(data, length, hash);
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}
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return hash;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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