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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef LATINIME_BIGRAM_LIST_POLICY_H
     18 #define LATINIME_BIGRAM_LIST_POLICY_H
     19 
     20 #include <cstdint>
     21 
     22 #include "defines.h"
     23 #include "dictionary/interface/dictionary_bigrams_structure_policy.h"
     24 #include "dictionary/structure/pt_common/bigram/bigram_list_read_write_utils.h"
     25 #include "utils/byte_array_view.h"
     26 
     27 namespace latinime {
     28 
     29 class BigramListPolicy : public DictionaryBigramsStructurePolicy {
     30  public:
     31     BigramListPolicy(const ReadOnlyByteArrayView buffer) : mBuffer(buffer) {}
     32 
     33     ~BigramListPolicy() {}
     34 
     35     void getNextBigram(int *const outBigramPos, int *const outProbability, bool *const outHasNext,
     36             int *const pos) const {
     37         BigramListReadWriteUtils::BigramFlags flags;
     38         if (!BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(mBuffer, &flags,
     39                 outBigramPos, pos)) {
     40             AKLOGE("Cannot read bigram entry. bufSize: %zd, pos: %d. ", mBuffer.size(), *pos);
     41             *outProbability = NOT_A_PROBABILITY;
     42             *outHasNext = false;
     43             return;
     44         }
     45         *outProbability = BigramListReadWriteUtils::getProbabilityFromFlags(flags);
     46         *outHasNext = BigramListReadWriteUtils::hasNext(flags);
     47     }
     48 
     49     bool skipAllBigrams(int *const pos) const {
     50         return BigramListReadWriteUtils::skipExistingBigrams(mBuffer, pos);
     51     }
     52 
     53  private:
     54     DISALLOW_IMPLICIT_CONSTRUCTORS(BigramListPolicy);
     55 
     56     const ReadOnlyByteArrayView mBuffer;
     57 };
     58 } // namespace latinime
     59 #endif // LATINIME_BIGRAM_LIST_POLICY_H
     60