Introduce EntryCounters to count entries in a dictionary.

Bug: 14425059

Change-Id: Ic13ba827d96fa4a147485ba92fdb37e23e04e8e8

1 files changed, 119 insertions, 0 deletions

diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/entry_counters.h b/native/jni/src/suggest/policyimpl/dictionary/utils/entry_counters.h
new file mode 100644
index 000000000..b8fa5aa9e
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/entry_counters.h
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2014, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_ENTRY_COUNTERS_H
+#define LATINIME_ENTRY_COUNTERS_H
+
+#include <array>
+
+#include "defines.h"
+
+namespace latinime {
+
+// Copyable but immutable
+class EntryCounts final {
+ public:
+    EntryCounts() : mEntryCounts({{0, 0, 0}}) {}
+
+    EntryCounts(const int unigramCount, const int bigramCount, const int trigramCount)
+            : mEntryCounts({{unigramCount, bigramCount, trigramCount}}) {}
+
+    explicit EntryCounts(const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> &counters)
+            : mEntryCounts(counters) {}
+
+    int getUnigramCount() const {
+        return mEntryCounts[0];
+    }
+
+    int getBigramCount() const {
+        return mEntryCounts[1];
+    }
+
+    int getTrigramCount() const {
+        return mEntryCounts[2];
+    }
+
+ private:
+    DISALLOW_ASSIGNMENT_OPERATOR(EntryCounts);
+
+    const std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> mEntryCounts;
+};
+
+class MutableEntryCounters final {
+ public:
+    MutableEntryCounters() {
+        mEntryCounters.fill(0);
+    }
+
+    MutableEntryCounters(const int unigramCount, const int bigramCount, const int trigramCount)
+            : mEntryCounters({{unigramCount, bigramCount, trigramCount}}) {}
+
+    const EntryCounts getEntryCounts() const {
+        return EntryCounts(mEntryCounters);
+    }
+
+    int getUnigramCount() const {
+        return mEntryCounters[0];
+    }
+
+    int getBigramCount() const {
+        return mEntryCounters[1];
+    }
+
+    int getTrigramCount() const {
+        return mEntryCounters[2];
+    }
+
+    void incrementUnigramCount() {
+        ++mEntryCounters[0];
+    }
+
+    void decrementUnigramCount() {
+        ASSERT(mEntryCounters[0] != 0);
+        --mEntryCounters[0];
+    }
+
+    void incrementBigramCount() {
+        ++mEntryCounters[1];
+    }
+
+    void decrementBigramCount() {
+        ASSERT(mEntryCounters[1] != 0);
+        --mEntryCounters[1];
+    }
+
+    void incrementNgramCount(const size_t n) {
+        if (n < 1 || n > mEntryCounters.size()) {
+            return;
+        }
+        ++mEntryCounters[n - 1];
+    }
+
+    void decrementNgramCount(const size_t n) {
+        if (n < 1 || n > mEntryCounters.size()) {
+            return;
+        }
+        ASSERT(mEntryCounters[n - 1] != 0);
+        --mEntryCounters[n - 1];
+    }
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(MutableEntryCounters);
+
+    std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1> mEntryCounters;
+};
+} // namespace latinime
+#endif /* LATINIME_ENTRY_COUNTERS_H */