mirror of https://gitee.com/bigwinds/arangodb
345 lines
10 KiB
C
345 lines
10 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief associative multi 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 2004-2012 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 triAGENS GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Martin Schoenert
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/// @author Copyright 2006-2012, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "associative-multi.h"
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// -----------------------------------------------------------------------------
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// --SECTION-- ASSOCIATIVE POINTERS
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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// --SECTION-- private functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Collections
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief adds a new element
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////////////////////////////////////////////////////////////////////////////////
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static void AddNewElementPointer (TRI_multi_pointer_t* array, void* element) {
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uint64_t hash;
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uint64_t i;
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// compute the hash
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hash = array->hashElement(array, element);
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// search the table
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i = hash % array->_nrAlloc;
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while (array->_table[i] != NULL) {
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i = (i + 1) % array->_nrAlloc;
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array->_nrProbesR++;
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}
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// add a new element to the associative array
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array->_table[i] = element;
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array->_nrUsed++;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief resizes the array
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////////////////////////////////////////////////////////////////////////////////
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static void ResizeMultiPointer (TRI_multi_pointer_t* array) {
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void** oldTable;
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uint64_t oldAlloc;
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uint64_t j;
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oldTable = array->_table;
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oldAlloc = array->_nrAlloc;
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array->_nrAlloc = 2 * array->_nrAlloc + 1;
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array->_nrUsed = 0;
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array->_nrResizes++;
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array->_table = TRI_Allocate(array->_nrAlloc * sizeof(void*));
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for (j = 0; j < array->_nrAlloc; j++) {
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array->_table[j] = 0;
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}
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for (j = 0; j < oldAlloc; j++) {
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if (oldTable[j] != NULL) {
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AddNewElementPointer(array, oldTable[j]);
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}
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}
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TRI_Free(oldTable);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Collections
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialises an array
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////////////////////////////////////////////////////////////////////////////////
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void TRI_InitMultiPointer (TRI_multi_pointer_t* array,
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uint64_t (*hashKey) (TRI_multi_pointer_t*, void const*),
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uint64_t (*hashElement) (TRI_multi_pointer_t*, void const*),
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bool (*isEqualKeyElement) (TRI_multi_pointer_t*, void const*, void const*),
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bool (*isEqualElementElement) (TRI_multi_pointer_t*, void const*, void const*)) {
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void** p;
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void** e;
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array->hashKey = hashKey;
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array->hashElement = hashElement;
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array->isEqualKeyElement = isEqualKeyElement;
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array->isEqualElementElement = isEqualElementElement;
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array->_nrAlloc = 10;
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array->_table = TRI_Allocate(sizeof(void*) * array->_nrAlloc);
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p = array->_table;
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e = p + array->_nrAlloc;
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for (; p < e; ++p) {
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*p = 0;
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}
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array->_nrUsed = 0;
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array->_nrFinds = 0;
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array->_nrAdds = 0;
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array->_nrRems = 0;
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array->_nrResizes = 0;
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array->_nrProbesF = 0;
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array->_nrProbesA = 0;
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array->_nrProbesD = 0;
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array->_nrProbesR = 0;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroys an array, but does not free the pointer
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////////////////////////////////////////////////////////////////////////////////
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void TRI_DestroyMultiPointer (TRI_multi_pointer_t* array) {
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TRI_Free(array->_table);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroys an array and frees the pointer
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////////////////////////////////////////////////////////////////////////////////
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void TRI_FreeMultiPointer (TRI_multi_pointer_t* array) {
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TRI_DestroyMultiPointer(array);
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TRI_Free(array);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Collections
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief lookups an element given a key
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////////////////////////////////////////////////////////////////////////////////
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TRI_vector_pointer_t TRI_LookupByKeyMultiPointer (TRI_multi_pointer_t* array, void const* key) {
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TRI_vector_pointer_t result;
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uint64_t hash;
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uint64_t i;
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// initialises the result vector
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TRI_InitVectorPointer(&result);
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// compute the hash
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hash = array->hashKey(array, key);
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i = hash % array->_nrAlloc;
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// update statistics
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array->_nrFinds++;
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// search the table
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while (array->_table[i] != NULL) {
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if (array->isEqualKeyElement(array, key, array->_table[i])) {
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TRI_PushBackVectorPointer(&result, array->_table[i]);
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}
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else {
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array->_nrProbesF++;
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}
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i = (i + 1) % array->_nrAlloc;
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}
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// return whatever we found
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief lookups an element given an element
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////////////////////////////////////////////////////////////////////////////////
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void* TRI_LookupByElementMultiPointer (TRI_multi_pointer_t* array, void const* element) {
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uint64_t hash;
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uint64_t i;
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// compute the hash
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hash = array->hashElement(array, element);
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i = hash % array->_nrAlloc;
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// update statistics
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array->_nrFinds++;
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// search the table
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while (array->_table[i] != NULL && ! array->isEqualElementElement(array, element, array->_table[i])) {
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i = (i + 1) % array->_nrAlloc;
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array->_nrProbesF++;
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}
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// return whatever we found
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return array->_table[i];
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief adds an key/element to the array
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////////////////////////////////////////////////////////////////////////////////
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void* TRI_InsertElementMultiPointer (TRI_multi_pointer_t* array, void* element, bool overwrite) {
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uint64_t hash;
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uint64_t i;
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void* old;
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// compute the hash
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hash = array->hashElement(array, element);
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i = hash % array->_nrAlloc;
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// update statistics
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array->_nrAdds++;
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// search the table
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while (array->_table[i] != NULL && ! array->isEqualElementElement(array, element, array->_table[i])) {
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i = (i + 1) % array->_nrAlloc;
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array->_nrProbesA++;
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}
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old = array->_table[i];
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// if we found an element, return
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if (old != NULL) {
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if (overwrite) {
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array->_table[i] = element;
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}
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return old;
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}
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// add a new element to the associative array
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array->_table[i] = element;
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array->_nrUsed++;
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// if we were adding and the table is more than half full, extend it
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if (array->_nrAlloc < 2 * array->_nrUsed) {
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ResizeMultiPointer(array);
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}
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return NULL;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief removes an element from the array
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////////////////////////////////////////////////////////////////////////////////
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void* TRI_RemoveElementMultiPointer (TRI_multi_pointer_t* array, void const* element) {
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uint64_t hash;
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uint64_t i;
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uint64_t k;
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void* old;
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hash = array->hashElement(array, element);
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i = hash % array->_nrAlloc;
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// update statistics
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array->_nrRems++;
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// search the table
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while (array->_table[i] != NULL && ! array->isEqualElementElement(array, element, array->_table[i])) {
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i = (i + 1) % array->_nrAlloc;
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array->_nrProbesD++;
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}
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// if we did not find such an item return 0
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if (array->_table[i] == NULL) {
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return NULL;
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}
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// remove item
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old = array->_table[i];
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array->_table[i] = NULL;
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array->_nrUsed--;
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// and now check the following places for items to move here
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k = (i + 1) % array->_nrAlloc;
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while (array->_table[k] != NULL) {
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uint64_t j = array->hashElement(array, array->_table[k]) % array->_nrAlloc;
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if ((i < k && !(i < j && j <= k)) || (k < i && !(i < j || j <= k))) {
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array->_table[i] = array->_table[k];
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array->_table[k] = NULL;
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i = k;
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}
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k = (k + 1) % array->_nrAlloc;
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}
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// return success
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return old;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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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}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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