1 // Copyright (C) 2019 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef ICING_INDEX_MAIN_MAIN_INDEX_MERGER_H_ 16 #define ICING_INDEX_MAIN_MAIN_INDEX_MERGER_H_ 17 18 #include <memory> 19 20 #include "icing/text_classifier/lib3/utils/base/statusor.h" 21 #include "icing/index/lite/lite-index.h" 22 #include "icing/index/main/main-index.h" 23 #include "icing/index/term-id-codec.h" 24 25 namespace icing { 26 namespace lib { 27 28 // Class used to merge hits from the lite_index and lite_lexicon into main_index 29 // and main_lexicon. 30 class MainIndexMerger { 31 public: 32 // Retrieves all hits in the lite index, translates the term ids of each 33 // LiteIndex::Element and expands prefix hits based on the mapping from 34 // lexicon_merge_outputs.other_tvi_to_prefix_main_tvis. 35 // 36 // RETURNS: 37 // - OK on success 38 // - INVALID_ARGUMENT if one of the elements in the lite index has a term_id 39 // that exceeds the max TermId 40 static libtextclassifier3::StatusOr<std::vector<TermIdHitPair>> 41 TranslateAndExpandLiteHits( 42 const LiteIndex& lite_index, const TermIdCodec& term_id_codec, 43 const MainIndex::LexiconMergeOutputs& lexicon_merge_outputs); 44 }; 45 46 } // namespace lib 47 } // namespace icing 48 49 #endif // ICING_INDEX_MAIN_MAIN_INDEX_MERGER_H_ 50