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// Copyright (C) 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ICING_INDEX_ITERATOR_DOC_HIT_INFO_ITERATOR_OR_H_
#define ICING_INDEX_ITERATOR_DOC_HIT_INFO_ITERATOR_OR_H_
#include <cstdint>
#include <string>
#include "icing/index/iterator/doc-hit-info-iterator.h"
namespace icing {
namespace lib {
// Given n iterators, will decide what the fastest Or-iterator implementation
// will be.
std::unique_ptr<DocHitInfoIterator> CreateOrIterator(
std::vector<std::unique_ptr<DocHitInfoIterator>> iterators);
// Iterate over a logical OR of two child iterators.
class DocHitInfoIteratorOr : public DocHitInfoIterator {
public:
explicit DocHitInfoIteratorOr(std::unique_ptr<DocHitInfoIterator> left_it,
std::unique_ptr<DocHitInfoIterator> right_it);
libtextclassifier3::StatusOr<TrimmedNode> TrimRightMostNode() && override;
libtextclassifier3::Status Advance() override;
int32_t GetNumBlocksInspected() const override;
int32_t GetNumLeafAdvanceCalls() const override;
std::string ToString() const override;
void PopulateMatchedTermsStats(
std::vector<TermMatchInfo> *matched_terms_stats,
SectionIdMask filtering_section_mask = kSectionIdMaskAll) const override {
if (doc_hit_info_.document_id() == kInvalidDocumentId) {
// Current hit isn't valid, return.
return;
}
current_->PopulateMatchedTermsStats(matched_terms_stats,
filtering_section_mask);
// If equal, then current_ == left_. Combine with results from right_.
if (left_document_id_ == right_document_id_) {
right_->PopulateMatchedTermsStats(matched_terms_stats,
filtering_section_mask);
}
}
private:
std::unique_ptr<DocHitInfoIterator> left_;
std::unique_ptr<DocHitInfoIterator> right_;
// Pointer to the chosen iterator that points to the current doc_hit_info_. If
// both left_ and right_ point to the same docid, then chosen_ == left.
// chosen_ does not own the iterator it points to.
DocHitInfoIterator *current_;
DocumentId left_document_id_ = kMaxDocumentId;
DocumentId right_document_id_ = kMaxDocumentId;
};
// Iterate over a logical OR of multiple child iterators.
//
// NOTE: DocHitInfoIteratorOr is a faster alternative to OR exactly 2 iterators.
class DocHitInfoIteratorOrNary : public DocHitInfoIterator {
public:
explicit DocHitInfoIteratorOrNary(
std::vector<std::unique_ptr<DocHitInfoIterator>> iterators);
libtextclassifier3::StatusOr<TrimmedNode> TrimRightMostNode() && override;
libtextclassifier3::Status Advance() override;
int32_t GetNumBlocksInspected() const override;
int32_t GetNumLeafAdvanceCalls() const override;
std::string ToString() const override;
void PopulateMatchedTermsStats(
std::vector<TermMatchInfo> *matched_terms_stats,
SectionIdMask filtering_section_mask = kSectionIdMaskAll) const override {
if (doc_hit_info_.document_id() == kInvalidDocumentId) {
// Current hit isn't valid, return.
return;
}
for (size_t i = 0; i < current_iterators_.size(); i++) {
current_iterators_.at(i)->PopulateMatchedTermsStats(
matched_terms_stats, filtering_section_mask);
}
}
private:
std::vector<std::unique_ptr<DocHitInfoIterator>> iterators_;
// Pointers to the iterators that point to the current doc_hit_info_.
// current_iterators_ does not own the iterators it points to.
std::vector<DocHitInfoIterator *> current_iterators_;
};
} // namespace lib
} // namespace icing
#endif // ICING_INDEX_ITERATOR_DOC_HIT_INFO_ITERATOR_OR_H_
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