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 
25 namespace latinime {
26 
27 // Copyable but immutable
28 class EntryCounts final {
29  public:
EntryCounts()30     EntryCounts() : mEntryCounts({{0, 0, 0, 0}}) {}
31 
EntryCounts(const std::array<int,MAX_PREV_WORD_COUNT_FOR_N_GRAM+1> & counters)32     explicit EntryCounts(const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> &counters)
33             : mEntryCounts(counters) {}
34 
getNgramCount(const NgramType ngramType)35     int getNgramCount(const NgramType ngramType) const {
36         return mEntryCounts[static_cast<int>(ngramType)];
37     }
38 
getCountArray()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 
51 class MutableEntryCounters final {
52  public:
MutableEntryCounters()53     MutableEntryCounters() {
54         mEntryCounters.fill(0);
55     }
56 
MutableEntryCounters(const std::array<int,MAX_PREV_WORD_COUNT_FOR_N_GRAM+1> & counters)57     explicit MutableEntryCounters(
58             const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> &counters)
59             : mEntryCounters(counters) {}
60 
getEntryCounts()61     const EntryCounts getEntryCounts() const {
62         return EntryCounts(mEntryCounters);
63     }
64 
incrementNgramCount(const NgramType ngramType)65     void incrementNgramCount(const NgramType ngramType) {
66         ++mEntryCounters[static_cast<int>(ngramType)];
67     }
68 
decrementNgramCount(const NgramType ngramType)69     void decrementNgramCount(const NgramType ngramType) {
70         --mEntryCounters[static_cast<int>(ngramType)];
71     }
72 
getNgramCount(const NgramType ngramType)73     int getNgramCount(const NgramType ngramType) const {
74         return mEntryCounters[static_cast<int>(ngramType)];
75     }
76 
setNgramCount(const NgramType ngramType,const int count)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