1/*
2 * Copyright (C) 2014, 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_ENTRY_COUNTERS_H
18#define LATINIME_ENTRY_COUNTERS_H
19
20#include <array>
21
22#include "defines.h"
23#include "utils/ngram_utils.h"
24
25namespace latinime {
26
27// Copyable but immutable
28class EntryCounts final {
29 public:
30    EntryCounts() : mEntryCounts({{0, 0, 0, 0}}) {}
31
32    explicit EntryCounts(const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> &counters)
33            : mEntryCounts(counters) {}
34
35    int getNgramCount(const NgramType ngramType) const {
36        return mEntryCounts[static_cast<int>(ngramType)];
37    }
38
39    const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> &getCountArray() const {
40        return mEntryCounts;
41    }
42
43 private:
44    DISALLOW_ASSIGNMENT_OPERATOR(EntryCounts);
45
46    // Counts from Unigram (0-th element) to (MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1)-gram
47    // (MAX_PREV_WORD_COUNT_FOR_N_GRAM-th element)
48    const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> mEntryCounts;
49};
50
51class MutableEntryCounters final {
52 public:
53    MutableEntryCounters() {
54        mEntryCounters.fill(0);
55    }
56
57    explicit MutableEntryCounters(
58            const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> &counters)
59            : mEntryCounters(counters) {}
60
61    const EntryCounts getEntryCounts() const {
62        return EntryCounts(mEntryCounters);
63    }
64
65    void incrementNgramCount(const NgramType ngramType) {
66        ++mEntryCounters[static_cast<int>(ngramType)];
67    }
68
69    void decrementNgramCount(const NgramType ngramType) {
70        --mEntryCounters[static_cast<int>(ngramType)];
71    }
72
73    int getNgramCount(const NgramType ngramType) const {
74        return mEntryCounters[static_cast<int>(ngramType)];
75    }
76
77    void setNgramCount(const NgramType ngramType, const int count) {
78        mEntryCounters[static_cast<int>(ngramType)] = count;
79    }
80
81 private:
82    DISALLOW_COPY_AND_ASSIGN(MutableEntryCounters);
83
84    // Counters from Unigram (0-th element) to (MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1)-gram
85    // (MAX_PREV_WORD_COUNT_FOR_N_GRAM-th element)
86    std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> mEntryCounters;
87};
88} // namespace latinime
89#endif /* LATINIME_ENTRY_COUNTERS_H */
90