| // Copyright (C) 2021 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_QUERY_SUGGESTION_PROCESSOR_H_ |
| #define ICING_QUERY_SUGGESTION_PROCESSOR_H_ |
| |
| #include <cstdint> |
| #include <memory> |
| #include <vector> |
| |
| #include "icing/text_classifier/lib3/utils/base/statusor.h" |
| #include "icing/index/embed/embedding-index.h" |
| #include "icing/index/index.h" |
| #include "icing/index/numeric/numeric-index.h" |
| #include "icing/proto/search.pb.h" |
| #include "icing/schema/schema-store.h" |
| #include "icing/store/document-store.h" |
| #include "icing/tokenization/language-segmenter.h" |
| #include "icing/transform/normalizer.h" |
| #include "icing/util/clock.h" |
| |
| namespace icing { |
| namespace lib { |
| |
| // Processes SuggestionSpecProtos and retrieves the specified TermMedaData that |
| // satisfies the prefix and its restrictions. This also performs ranking, and |
| // returns TermMetaData ordered by their hit count. |
| class SuggestionProcessor { |
| public: |
| // Factory function to create a SuggestionProcessor which does not take |
| // ownership of any input components, and all pointers must refer to valid |
| // objects that outlive the created SuggestionProcessor instance. |
| // |
| // Returns: |
| // An SuggestionProcessor on success |
| // FAILED_PRECONDITION if any of the pointers is null. |
| static libtextclassifier3::StatusOr<std::unique_ptr<SuggestionProcessor>> |
| Create(Index* index, const NumericIndex<int64_t>* numeric_index, |
| const EmbeddingIndex* embedding_index, |
| const LanguageSegmenter* language_segmenter, |
| const Normalizer* normalizer, const DocumentStore* document_store, |
| const SchemaStore* schema_store, const Clock* clock); |
| |
| // Query suggestions based on the given SuggestionSpecProto. |
| // |
| // Returns: |
| // On success, |
| // - One vector that represents the entire TermMetadata |
| // INTERNAL_ERROR on all other errors |
| libtextclassifier3::StatusOr<std::vector<TermMetadata>> QuerySuggestions( |
| const SuggestionSpecProto& suggestion_spec, int64_t current_time_ms); |
| |
| private: |
| explicit SuggestionProcessor(Index* index, |
| const NumericIndex<int64_t>* numeric_index, |
| const EmbeddingIndex* embedding_index, |
| const LanguageSegmenter* language_segmenter, |
| const Normalizer* normalizer, |
| const DocumentStore* document_store, |
| const SchemaStore* schema_store, |
| const Clock* clock); |
| |
| // Not const because we could modify/sort the TermMetaData buffer in the lite |
| // index. |
| Index& index_; // Does not own. |
| const NumericIndex<int64_t>& numeric_index_; // Does not own. |
| const EmbeddingIndex& embedding_index_; // Does not own. |
| const LanguageSegmenter& language_segmenter_; // Does not own. |
| const Normalizer& normalizer_; // Does not own. |
| const DocumentStore& document_store_; // Does not own. |
| const SchemaStore& schema_store_; // Does not own. |
| const Clock& clock_; // Does not own. |
| }; |
| |
| } // namespace lib |
| } // namespace icing |
| |
| #endif // ICING_QUERY_SUGGESTION_PROCESSOR_H_ |