mirror of https://gitee.com/bigwinds/arangodb
251 lines
9.0 KiB
C
251 lines
9.0 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief edge collection functionality
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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 2004-2013 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 Jan Steemann
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/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "edge-collection.h"
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#include "BasicsC/associative-multi.h"
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#include "BasicsC/logging.h"
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#include "VocBase/document-collection.h"
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#include "VocBase/index.h"
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// -----------------------------------------------------------------------------
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// --SECTION-- EDGES INDEX
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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 VocBase
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief find the edges index of a document collection
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////////////////////////////////////////////////////////////////////////////////
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static TRI_multi_pointer_t* FindEdgesIndex (TRI_document_collection_t* const document) {
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size_t i, n;
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if (document->base.base._info._type != TRI_COL_TYPE_EDGE) {
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// collection is not an edge collection... caller must handle that
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return NULL;
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}
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n = document->_allIndexes._length;
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for (i = 0; i < n; ++i) {
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TRI_index_t* idx = (TRI_index_t*) TRI_AtVectorPointer(&document->_allIndexes, i);
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if (idx->_type == TRI_IDX_TYPE_EDGE_INDEX) {
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TRI_edge_index_t* edgesIndex = (TRI_edge_index_t*) idx;
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return &edgesIndex->_edges;
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}
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}
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// collection does not have an edges index... caller must handle that
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return NULL;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return whether an edge is self-reflexive
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////////////////////////////////////////////////////////////////////////////////
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static bool IsReflexive (const TRI_edge_header_t* const edge) {
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return ((edge->_flags & TRI_EDGE_BIT_REFLEXIVE) > 0);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief find edges matching search criteria and add them to the result
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/// this function is called two times for each edge query:
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/// the first call (with matchType 1) will query the index with the originally
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/// requested direction, whereas the second call will query the index with the
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/// opposite direction (with matchType 2 or 3) to find all counterparts
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////////////////////////////////////////////////////////////////////////////////
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static bool FindEdges (const TRI_edge_direction_e direction,
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TRI_multi_pointer_t* idx,
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TRI_vector_pointer_t* result,
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TRI_edge_header_t* entry,
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const int matchType) {
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TRI_vector_pointer_t found;
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entry->_flags = TRI_LookupFlagsEdge(direction);
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found = TRI_LookupByKeyMultiPointer(TRI_UNKNOWN_MEM_ZONE, idx, entry);
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if (found._length > 0) {
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TRI_edge_header_t* edge;
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size_t i;
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if (result->_capacity == 0) {
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int res;
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// if result vector is still empty and we have results, re-init the
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// result vector to a "good" size. this will save later reallocations
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res = TRI_InitVectorPointer2(result, TRI_UNKNOWN_MEM_ZONE, found._length);
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if (res != TRI_ERROR_NO_ERROR) {
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TRI_DestroyVectorPointer(&found);
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TRI_set_errno(res);
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return false;
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}
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}
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// add all results found
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for (i = 0; i < found._length; ++i) {
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edge = (TRI_edge_header_t*) found._buffer[i];
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// the following queries will use the following sequences of matchTypes:
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// inEdges(): 1, 2, outEdges(): 1, 2, edges(): 1, 3
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// if matchType is 1, we'll return all found edges without further filtering
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//
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// if matchType is 2 (inEdges or outEdges query), the direction is reversed.
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// We'll exclude all self-reflexive edges now (we already got them in iteration 1),
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// and alsoexclude all unidirectional edges
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//
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// if matchType is 3, the direction is also reversed. We'll exclude all
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// self-reflexive edges now (we already got them in iteration 1)
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if (matchType > 1) {
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// if the edge is self-reflexive, we have already found it in iteration 1
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// we must skip it here, otherwise we would produce duplicates
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if (IsReflexive(edge)) {
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continue;
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}
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}
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TRI_PushBackVectorPointer(result, CONST_CAST(edge->_mptr));
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}
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}
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TRI_DestroyVectorPointer(&found);
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return true;
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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 VocBase
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief compose edge flags aggregate out of only the direction
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////////////////////////////////////////////////////////////////////////////////
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TRI_edge_flags_t TRI_LookupFlagsEdge (const TRI_edge_direction_e direction) {
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if (direction == TRI_EDGE_IN) {
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return TRI_EDGE_BIT_DIRECTION_IN;
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}
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if (direction == TRI_EDGE_OUT) {
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return TRI_EDGE_BIT_DIRECTION_OUT;
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}
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// invalid direction type
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assert(false);
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return 0;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief compose edge flags aggregate out of multiple individual parameters
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////////////////////////////////////////////////////////////////////////////////
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TRI_edge_flags_t TRI_FlagsEdge (const TRI_edge_direction_e direction,
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const bool isReflexive) {
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TRI_edge_flags_t result = TRI_LookupFlagsEdge(direction);
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if (isReflexive) {
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result |= TRI_EDGE_BIT_REFLEXIVE;
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}
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return result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief looks up edges
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////////////////////////////////////////////////////////////////////////////////
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TRI_vector_pointer_t TRI_LookupEdgesDocumentCollection (TRI_document_collection_t* document,
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TRI_edge_direction_e direction,
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TRI_voc_cid_t cid,
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TRI_voc_key_t key) {
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TRI_vector_pointer_t result;
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TRI_edge_header_t entry;
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TRI_multi_pointer_t* edgesIndex;
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// search criteria
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entry._mptr = NULL;
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entry._cid = cid;
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entry._searchKey._key = key;
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// initialise the result vector
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TRI_InitVectorPointer(&result, TRI_UNKNOWN_MEM_ZONE);
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edgesIndex = FindEdgesIndex(document);
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if (edgesIndex == NULL) {
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LOG_ERROR("collection does not have an edges index");
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return result;
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}
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if (direction == TRI_EDGE_IN) {
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// get all edges with a matching IN vertex
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FindEdges(TRI_EDGE_IN, edgesIndex, &result, &entry, 1);
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}
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else if (direction == TRI_EDGE_OUT) {
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// get all edges with a matching OUT vertex
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FindEdges(TRI_EDGE_OUT, edgesIndex, &result, &entry, 1);
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}
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else if (direction == TRI_EDGE_ANY) {
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// get all edges with a matching IN vertex
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FindEdges(TRI_EDGE_IN, edgesIndex, &result, &entry, 1);
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// add all non-reflexive edges with a matching OUT vertex
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FindEdges(TRI_EDGE_OUT, edgesIndex, &result, &entry, 3);
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}
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return result;
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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\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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