mirror of https://gitee.com/bigwinds/arangodb
141 lines
4.3 KiB
C++
141 lines
4.3 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 Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_CLUSTER_CLUSTER_TRAVERSER_H
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#define ARANGOD_CLUSTER_CLUSTER_TRAVERSER_H 1
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#include "VocBase/Traverser.h"
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namespace arangodb {
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class CollectionNameResolver;
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class Transaction;
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namespace traverser {
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class ClusterTraversalPath;
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class ClusterTraverser : public Traverser {
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public:
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ClusterTraverser(
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std::vector<std::string> edgeCollections, TraverserOptions& opts,
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std::string dbname, CollectionNameResolver const* resolver,
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std::unordered_map<size_t, std::vector<TraverserExpression*>> const*
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expressions)
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: Traverser(opts, expressions),
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_edgeCols(edgeCollections),
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_dbname(dbname),
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_vertexGetter(this),
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_edgeGetter(this),
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_resolver(resolver) {}
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~ClusterTraverser() {
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}
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void setStartVertex(arangodb::velocypack::Slice const&) override;
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TraversalPath* next() override;
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arangodb::basics::Json* edgeToJson(std::string const&) const;
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arangodb::basics::Json* vertexToJson(std::string const&) const;
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private:
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bool vertexMatchesCondition(arangodb::velocypack::Slice const&,
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std::vector<TraverserExpression*> const&);
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class VertexGetter {
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public:
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explicit VertexGetter(ClusterTraverser* traverser)
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: _traverser(traverser) {}
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bool operator()(arangodb::velocypack::Slice const&, arangodb::velocypack::Slice const&, size_t,
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arangodb::velocypack::Slice&);
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private:
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ClusterTraverser* _traverser;
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};
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class EdgeGetter {
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public:
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explicit EdgeGetter(ClusterTraverser* traverser)
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: _traverser(traverser), _continueConst(1) {}
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void operator()(arangodb::velocypack::Slice const&,
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std::vector<arangodb::velocypack::Slice>&, size_t*&,
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size_t&, bool&);
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private:
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ClusterTraverser* _traverser;
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size_t _continueConst;
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};
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std::unordered_map<arangodb::velocypack::Slice, arangodb::velocypack::Slice> _edges;
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std::unordered_map<arangodb::velocypack::Slice, arangodb::velocypack::Slice> _vertices;
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std::stack<std::stack<arangodb::velocypack::Slice>> _iteratorCache;
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std::vector<std::string> _edgeCols;
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std::string _dbname;
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VertexGetter _vertexGetter;
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EdgeGetter _edgeGetter;
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CollectionNameResolver const* _resolver;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief internal cursor to enumerate the paths of a graph
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//////////////////////////////////////////////////////////////////////////////
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std::unique_ptr<arangodb::basics::PathEnumerator<arangodb::velocypack::Slice, arangodb::velocypack::Slice,
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size_t>> _enumerator;
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};
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class ClusterTraversalPath : public TraversalPath {
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public:
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ClusterTraversalPath(
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ClusterTraverser const* traverser,
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const arangodb::basics::EnumeratedPath<arangodb::velocypack::Slice, arangodb::velocypack::Slice>& path)
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: _path(path), _traverser(traverser) {}
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arangodb::basics::Json* pathToJson(Transaction*, CollectionNameResolver*);
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arangodb::basics::Json* lastEdgeToJson(Transaction*, CollectionNameResolver*);
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arangodb::basics::Json* lastVertexToJson(Transaction*,
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CollectionNameResolver*);
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private:
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arangodb::basics::EnumeratedPath<arangodb::velocypack::Slice, arangodb::velocypack::Slice> _path;
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ClusterTraverser const* _traverser;
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};
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} // traverser
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} // triagens
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#endif
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