bigram_list_policy.h revision 3225b6fe66a84ed7f499daf84d085141a66bb346 
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 "suggest/core/policy/dictionary_bigrams_structure_policy.h"
24#include "suggest/policyimpl/dictionary/structure/pt_common/bigram/bigram_list_read_write_utils.h"
25
26namespace latinime {
27
28class BigramListPolicy : public DictionaryBigramsStructurePolicy {
29 public:
30    BigramListPolicy(const uint8_t *const bigramsBuf, const int bufSize)
31            : mBigramsBuf(bigramsBuf), mBufSize(bufSize) {}
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(mBigramsBuf,
39                mBufSize, &flags, outBigramPos, pos)) {
40            AKLOGE("Cannot read bigram entry. mBufSize: %d, pos: %d. ", mBufSize, *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(mBigramsBuf, mBufSize, pos);
51    }
52
53 private:
54    DISALLOW_IMPLICIT_CONSTRUCTORS(BigramListPolicy);
55
56    const uint8_t *const mBigramsBuf;
57    const int mBufSize;
58};
59} // namespace latinime
60#endif // LATINIME_BIGRAM_LIST_POLICY_H
61