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:
BigramListPolicy(const ReadOnlyByteArrayView buffer)31     BigramListPolicy(const ReadOnlyByteArrayView buffer) : mBuffer(buffer) {}
32 
~BigramListPolicy()33     ~BigramListPolicy() {}
34 
getNextBigram(int * const outBigramPos,int * const outProbability,bool * const outHasNext,int * const pos)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 
skipAllBigrams(int * const pos)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