mirror of https://gitee.com/bigwinds/arangodb
142 lines
5.1 KiB
C++
142 lines
5.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2018 ArangoDB 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 Andrey Abramov
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/// @author Vasiliy Nabatchikov
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_IRESEARCH__IRESEARCH_PRIMARY_KEY_FILTER_H
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#define ARANGOD_IRESEARCH__IRESEARCH_PRIMARY_KEY_FILTER_H 1
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#include "IResearchDocument.h"
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#include "VocBase/voc-types.h"
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#include "search/filter.hpp"
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#include "utils/type_limits.hpp"
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namespace arangodb {
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namespace iresearch {
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///////////////////////////////////////////////////////////////////////////////
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/// @class PrimaryKeyFilter
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/// @brief iresearch filter optimized for filtering on primary keys
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///////////////////////////////////////////////////////////////////////////////
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class PrimaryKeyFilter final : public irs::filter, public irs::filter::prepared {
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public:
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DECLARE_FILTER_TYPE();
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explicit PrimaryKeyFilter(arangodb::LocalDocumentId const& value) noexcept
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: irs::filter(PrimaryKeyFilter::type()),
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_pk(DocumentPrimaryKey::encode(value)),
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_pkSeen(false) {}
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// ----------------------------------------------------------------------------
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// --SECTION-- irs::filter::prepared
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// ----------------------------------------------------------------------------
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virtual irs::doc_iterator::ptr execute(irs::sub_reader const& segment,
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irs::order::prepared const& /*order*/,
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irs::attribute_view const& /*ctx*/
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) const override;
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// ----------------------------------------------------------------------------
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// --SECTION-- irs::filter
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// ----------------------------------------------------------------------------
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virtual size_t hash() const noexcept override;
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using irs::filter::prepare;
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virtual filter::prepared::ptr prepare(
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irs::index_reader const& index,
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irs::order::prepared const& /*ord*/,
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irs::boost_t /*boost*/,
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irs::attribute_view const& /*ctx*/
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) const override;
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protected:
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bool equals(filter const& rhs) const noexcept override;
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private:
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struct PrimaryKeyIterator final : public irs::doc_iterator {
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PrimaryKeyIterator() = default;
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virtual bool next() noexcept override {
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_doc = _next;
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_next = irs::type_limits<irs::type_t::doc_id_t>::eof();
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return !irs::type_limits<irs::type_t::doc_id_t>::eof(_doc);
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}
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virtual irs::doc_id_t seek(irs::doc_id_t target) noexcept override {
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_doc = target <= _next ? _next : irs::type_limits<irs::type_t::doc_id_t>::eof();
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return _doc;
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}
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virtual irs::doc_id_t value() const noexcept override { return _doc; }
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virtual irs::attribute_view const& attributes() const noexcept override {
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return irs::attribute_view::empty_instance();
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}
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void reset(irs::doc_id_t doc) noexcept {
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_doc = irs::type_limits<irs::type_t::doc_id_t>::invalid();
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_next = doc;
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}
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mutable irs::doc_id_t _doc{irs::type_limits<irs::type_t::doc_id_t>::invalid()};
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mutable irs::doc_id_t _next{irs::type_limits<irs::type_t::doc_id_t>::eof()};
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}; // PrimaryKeyIterator
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mutable LocalDocumentId::BaseType _pk;
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mutable PrimaryKeyIterator _pkIterator;
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mutable bool _pkSeen; // true == do not perform further execution
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// (first-match optimization)
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}; // PrimaryKeyFilter
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///////////////////////////////////////////////////////////////////////////////
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/// @class PrimaryKeyFilterContainer
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/// @brief container for storing 'PrimaryKeyFilter's, does nothing as a filter
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///////////////////////////////////////////////////////////////////////////////
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class PrimaryKeyFilterContainer final : public irs::empty {
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public:
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DECLARE_FILTER_TYPE();
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PrimaryKeyFilterContainer() = default;
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PrimaryKeyFilterContainer(PrimaryKeyFilterContainer&&) = default;
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PrimaryKeyFilterContainer& operator=(PrimaryKeyFilterContainer&&) = default;
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PrimaryKeyFilter& emplace(arangodb::LocalDocumentId const& value) {
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_filters.emplace_back(value);
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return _filters.back();
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}
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bool empty() const noexcept { return _filters.empty(); }
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void clear() noexcept { _filters.clear(); }
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private:
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std::deque<PrimaryKeyFilter> _filters; // pointers remain valid
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}; // PrimaryKeyFilterContainer
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} // namespace iresearch
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} // namespace arangodb
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#endif // ARANGOD_IRESEARCH__IRESEARCH_PRIMARY_KEY_FILTER_H
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