Add method to remove entry from language model dict content.

Bug: 14425059
Change-Id: Id21af0110e770caa3e95cb5d7ba8b3d1af8e0b12

native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.cpp

@@ -53,6 +53,16 @@ bool LanguageModelDictContent::setNgramProbabilityEntry(const WordIdArrayView pr
     return mTrieMap.put(terminalId, probabilityEntry->encode(mHasHistoricalInfo), bitmapEntryIndex);
 }
 
+bool LanguageModelDictContent::removeNgramProbabilityEntry(const WordIdArrayView prevWordIds,
+        const int wordId) {
+    const int bitmapEntryIndex = getBitmapEntryIndex(prevWordIds);
+    if (bitmapEntryIndex == TrieMap::INVALID_INDEX) {
+        // Cannot find bitmap entry for the probability entry. The entry doesn't exist.
+        return false;
+    }
+    return mTrieMap.remove(wordId, bitmapEntryIndex);
+}
+
 bool LanguageModelDictContent::runGCInner(
         const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
         const TrieMap::TrieMapRange trieMapRange,

native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content.h

@@ -61,12 +61,18 @@ class LanguageModelDictContent {
         return setNgramProbabilityEntry(WordIdArrayView(), wordId, probabilityEntry);
     }
 
+    bool removeProbabilityEntry(const int wordId) {
+        return removeNgramProbabilityEntry(WordIdArrayView(), wordId);
+    }
+
     ProbabilityEntry getNgramProbabilityEntry(const WordIdArrayView prevWordIds,
             const int wordId) const;
 
     bool setNgramProbabilityEntry(const WordIdArrayView prevWordIds, const int wordId,
             const ProbabilityEntry *const probabilityEntry);
 
+    bool removeNgramProbabilityEntry(const WordIdArrayView prevWordIds, const int wordId);
+
  private:
     DISALLOW_COPY_AND_ASSIGN(LanguageModelDictContent);
 

native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.cpp

@@ -420,6 +420,10 @@ bool TrieMap::addNewEntryByExpandingTable(const uint32_t key, const uint64_t val
 
 bool TrieMap::removeInner(const Entry &bitmapEntry) {
     const int tableSize = popCount(bitmapEntry.getBitmap());
+    if (tableSize <= 0) {
+        // The table is empty. No need to remove any entries.
+        return true;
+    }
     for (int i = 0; i < tableSize; ++i) {
         const int entryIndex = bitmapEntry.getTableIndex() + i;
         const Entry entry = readEntry(entryIndex);
@@ -444,7 +448,7 @@ bool TrieMap::removeInner(const Entry &bitmapEntry) {
             }
         }
     }
-    return freeTable(bitmapEntry.getTableIndex(), tableSize);
+    return true;
 }
 
 }  // namespace latinime

native/jni/tests/suggest/policyimpl/dictionary/structure/v4/content/language_model_dict_content_test.cpp

@@ -35,6 +35,13 @@ TEST(LanguageModelDictContentTest, TestUnigramProbability) {
             LanguageModelDictContent.getProbabilityEntry(wordId);
     EXPECT_EQ(flag, entry.getFlags());
     EXPECT_EQ(probability, entry.getProbability());
+
+    // Remove
+    EXPECT_TRUE(LanguageModelDictContent.removeProbabilityEntry(wordId));
+    EXPECT_FALSE(LanguageModelDictContent.getProbabilityEntry(wordId).isValid());
+    EXPECT_FALSE(LanguageModelDictContent.removeProbabilityEntry(wordId));
+    EXPECT_TRUE(LanguageModelDictContent.setProbabilityEntry(wordId, &probabilityEntry));
+    EXPECT_TRUE(LanguageModelDictContent.getProbabilityEntry(wordId).isValid());
 }
 
 TEST(LanguageModelDictContentTest, TestUnigramProbabilityWithHistoricalInfo) {
@@ -53,6 +60,13 @@ TEST(LanguageModelDictContentTest, TestUnigramProbabilityWithHistoricalInfo) {
     EXPECT_EQ(timestamp, entry.getHistoricalInfo()->getTimeStamp());
     EXPECT_EQ(level, entry.getHistoricalInfo()->getLevel());
     EXPECT_EQ(count, entry.getHistoricalInfo()->getCount());
+
+    // Remove
+    EXPECT_TRUE(LanguageModelDictContent.removeProbabilityEntry(wordId));
+    EXPECT_FALSE(LanguageModelDictContent.getProbabilityEntry(wordId).isValid());
+    EXPECT_FALSE(LanguageModelDictContent.removeProbabilityEntry(wordId));
+    EXPECT_TRUE(LanguageModelDictContent.setProbabilityEntry(wordId, &probabilityEntry));
+    EXPECT_TRUE(LanguageModelDictContent.removeProbabilityEntry(wordId));
 }
 
 }  // namespace

native/jni/tests/suggest/policyimpl/dictionary/utils/trie_map_test.cpp

@@ -70,6 +70,8 @@ TEST(TrieMapTest, TestRemove) {
     EXPECT_FALSE(result.mIsValid);
     EXPECT_EQ(TrieMap::INVALID_INDEX, result.mNextLevelBitmapEntryIndex);
     EXPECT_EQ(11ull, trieMap.getRoot(12).mValue);
+    EXPECT_TRUE(trieMap.putRoot(S_INT_MAX, 0xFFFFFFFFFull));
+    EXPECT_TRUE(trieMap.remove(S_INT_MAX, trieMap.getRootBitmapEntryIndex()));
 }
 
 TEST(TrieMapTest, TestSetAndGetLarge) {