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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.
#include "icing/index/lite/doc-hit-info-iterator-term-lite.h"
#include <cstdint>
#include "icing/text_classifier/lib3/utils/base/status.h"
#include "icing/absl_ports/canonical_errors.h"
#include "icing/absl_ports/str_cat.h"
#include "icing/index/hit/doc-hit-info.h"
#include "icing/schema/section.h"
#include "icing/util/logging.h"
#include "icing/util/status-macros.h"
namespace icing {
namespace lib {
namespace {
std::string SectionIdMaskToString(SectionIdMask section_id_mask) {
std::string mask(kMaxSectionId + 1, '0');
for (SectionId i = kMaxSectionId; i >= 0; --i) {
if (section_id_mask & (1U << i)) {
mask[kMaxSectionId - i] = '1';
}
}
return mask;
}
} // namespace
libtextclassifier3::Status DocHitInfoIteratorTermLite::Advance() {
if (cached_hits_idx_ == -1) {
libtextclassifier3::Status status = RetrieveMoreHits();
if (!status.ok()) {
if (!absl_ports::IsNotFound(status)) {
// NOT_FOUND is expected to happen (not every term will be in the main
// index!). Other errors are worth logging.
ICING_LOG(ERROR)
<< "Encountered unexpected failure while retrieving hits "
<< status.error_message();
}
return absl_ports::ResourceExhaustedError(
"No more DocHitInfos in iterator");
}
} else {
++cached_hits_idx_;
}
if (cached_hits_idx_ == -1 || cached_hits_idx_ >= cached_hits_.size()) {
// Nothing more for the iterator to return. Set these members to invalid
// values.
doc_hit_info_ = DocHitInfo();
hit_intersect_section_ids_mask_ = kSectionIdMaskNone;
return absl_ports::ResourceExhaustedError(
"No more DocHitInfos in iterator");
}
doc_hit_info_ = cached_hits_.at(cached_hits_idx_);
hit_intersect_section_ids_mask_ = doc_hit_info_.hit_section_ids_mask();
return libtextclassifier3::Status::OK;
}
libtextclassifier3::Status DocHitInfoIteratorTermLiteExact::RetrieveMoreHits() {
// Exact match only. All hits in lite lexicon are exact.
ICING_ASSIGN_OR_RETURN(uint32_t tvi, lite_index_->GetTermId(term_));
ICING_ASSIGN_OR_RETURN(uint32_t term_id,
term_id_codec_->EncodeTvi(tvi, TviType::LITE));
lite_index_->AppendHits(term_id, section_restrict_mask_,
/*only_from_prefix_sections=*/false,
/*namespace_checker=*/nullptr, &cached_hits_);
cached_hits_idx_ = 0;
return libtextclassifier3::Status::OK;
}
std::string DocHitInfoIteratorTermLiteExact::ToString() const {
return absl_ports::StrCat(SectionIdMaskToString(section_restrict_mask_), ":",
term_);
}
libtextclassifier3::Status
DocHitInfoIteratorTermLitePrefix::RetrieveMoreHits() {
// Take union of lite terms.
int term_len = term_.length();
int terms_matched = 0;
for (LiteIndex::PrefixIterator it = lite_index_->FindTermPrefixes(term_);
it.IsValid(); it.Advance()) {
bool exact_match = strlen(it.GetKey()) == term_len;
ICING_ASSIGN_OR_RETURN(
uint32_t term_id,
term_id_codec_->EncodeTvi(it.GetValueIndex(), TviType::LITE));
lite_index_->AppendHits(term_id, section_restrict_mask_,
/*only_from_prefix_sections=*/!exact_match,
/*namespace_checker=*/nullptr, &cached_hits_);
++terms_matched;
}
if (terms_matched > 1) {
SortAndDedupeDocumentIds();
}
cached_hits_idx_ = 0;
return libtextclassifier3::Status::OK;
}
void DocHitInfoIteratorTermLitePrefix::SortAndDedupeDocumentIds() {
// Re-sort cached document_ids and merge sections.
sort(cached_hits_.begin(), cached_hits_.end());
int idx = 0;
for (int i = 1; i < cached_hits_.size(); ++i) {
const DocHitInfo& hit_info = cached_hits_.at(i);
DocHitInfo& collapsed_hit_info = cached_hits_.at(idx);
if (collapsed_hit_info.document_id() == hit_info.document_id()) {
collapsed_hit_info.MergeSectionsFrom(hit_info);
} else {
// New document_id.
cached_hits_.at(++idx) = hit_info;
}
}
// idx points to last doc hit info.
cached_hits_.resize(idx + 1);
}
std::string DocHitInfoIteratorTermLitePrefix::ToString() const {
return absl_ports::StrCat(SectionIdMaskToString(section_restrict_mask_), ":",
term_, "*");
}
} // namespace lib
} // namespace icing
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