Merge "Refactoring: Separate updating methods from writing methods."

10 files changed, 396 insertions, 299 deletions

diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index 99a479e22..35fa352d9 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -84,6 +84,7 @@ LATIN_IME_CORE_SRC_FILES := \
         dynamic_patricia_trie_policy.cpp \
         dynamic_patricia_trie_reading_helper.cpp \
         dynamic_patricia_trie_reading_utils.cpp \
+        dynamic_patricia_trie_updating_helper.cpp \
         dynamic_patricia_trie_writing_helper.cpp \
         dynamic_patricia_trie_writing_utils.cpp) \
     $(addprefix suggest/policyimpl/dictionary/structure/v4/, \
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h
index c9eff3d80..0f1e635bc 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h
@@ -46,6 +46,9 @@ class PtNodeWriter {
             const PtNodeParams *const targetPtNodeParam, const int probability,
             bool *const outAddedNewBigram) = 0;
 
+    virtual bool removeBigramEntry(const PtNodeParams *const sourcePtNodeParams,
+            const PtNodeParams *const targetPtNodeParam) = 0;
+
  protected:
     PtNodeWriter() {};
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.cpp
index 890606f89..3b1e16cc7 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.cpp
@@ -224,4 +224,13 @@ bool DynamicPatriciaTrieNodeWriter::addNewBigramEntry(
     }
 }
 
+bool DynamicPatriciaTrieNodeWriter::removeBigramEntry(
+        const PtNodeParams *const sourcePtNodeParams, const PtNodeParams *const targetPtNodeParam) {
+    if (sourcePtNodeParams->getBigramsPos() == NOT_A_DICT_POS) {
+        return false;
+    }
+    return mBigramPolicy->removeBigram(sourcePtNodeParams->getBigramsPos(),
+            targetPtNodeParam->getHeadPos());
+}
+
 }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.h
index e3a00e94e..87ed1b159 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.h
@@ -63,6 +63,9 @@ class DynamicPatriciaTrieNodeWriter : public PtNodeWriter {
             const PtNodeParams *const targetPtNodeParam, const int probability,
             bool *const outAddedNewBigram);
 
+    virtual bool removeBigramEntry(const PtNodeParams *const sourcePtNodeParams,
+            const PtNodeParams *const targetPtNodeParam);
+
  private:
     DISALLOW_COPY_AND_ASSIGN(DynamicPatriciaTrieNodeWriter);
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.cpp
index 0500f23d1..6b58f5fb7 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.cpp
@@ -27,6 +27,7 @@
 #include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_reader.h"
 #include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_reading_helper.h"
 #include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.h"
 #include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.h"
 #include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
 #include "suggest/policyimpl/dictionary/utils/probability_utils.h"
@@ -152,10 +153,8 @@ bool DynamicPatriciaTriePolicy::addUnigramWord(const int *const word, const int
     }
     DynamicPatriciaTrieReadingHelper readingHelper(&mBufferWithExtendableBuffer, &mNodeReader);
     readingHelper.initWithPtNodeArrayPos(getRootPosition());
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer, &mNodeReader,
-            &mNodeWriter, &mBigramListPolicy, &mShortcutListPolicy, mHeaderPolicy.isDecayingDict());
     bool addedNewUnigram = false;
-    if (writingHelper.addUnigramWord(&readingHelper, word, length, probability,
+    if (mUpdatingHelper.addUnigramWord(&readingHelper, word, length, probability,
             &addedNewUnigram)) {
         if (addedNewUnigram) {
             mUnigramCount++;
@@ -187,10 +186,8 @@ bool DynamicPatriciaTriePolicy::addBigramWords(const int *const word0, const int
     if (word1Pos == NOT_A_DICT_POS) {
         return false;
     }
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer, &mNodeReader,
-            &mNodeWriter, &mBigramListPolicy, &mShortcutListPolicy, mHeaderPolicy.isDecayingDict());
     bool addedNewBigram = false;
-    if (writingHelper.addBigramWords(word0Pos, word1Pos, probability, &addedNewBigram)) {
+    if (mUpdatingHelper.addBigramWords(word0Pos, word1Pos, probability, &addedNewBigram)) {
         if (addedNewBigram) {
             mBigramCount++;
         }
@@ -221,9 +218,7 @@ bool DynamicPatriciaTriePolicy::removeBigramWords(const int *const word0, const
     if (word1Pos == NOT_A_DICT_POS) {
         return false;
     }
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer, &mNodeReader,
-            &mNodeWriter, &mBigramListPolicy, &mShortcutListPolicy, mHeaderPolicy.isDecayingDict());
-    if (writingHelper.removeBigramWords(word0Pos, word1Pos)) {
+    if (mUpdatingHelper.removeBigramWords(word0Pos, word1Pos)) {
         mBigramCount--;
         return true;
     } else {
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.h
index 1c490ceb9..454698430 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_policy.h
@@ -24,6 +24,7 @@
 #include "suggest/policyimpl/dictionary/shortcut/dynamic_shortcut_list_policy.h"
 #include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_reader.h"
 #include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_node_writer.h"
+#include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.h"
 #include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
 #include "suggest/policyimpl/dictionary/utils/format_utils.h"
 #include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
@@ -49,6 +50,8 @@ class DynamicPatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
               mNodeReader(&mBufferWithExtendableBuffer, &mBigramListPolicy, &mShortcutListPolicy),
               mNodeWriter(&mBufferWithExtendableBuffer, &mNodeReader, &mBigramListPolicy,
                       &mShortcutListPolicy),
+              mUpdatingHelper(&mBufferWithExtendableBuffer, &mNodeReader, &mNodeWriter,
+                      mHeaderPolicy.isDecayingDict()),
               mUnigramCount(mHeaderPolicy.getUnigramCount()),
               mBigramCount(mHeaderPolicy.getBigramCount()), mNeedsToDecayForTesting(false) {}
 
@@ -121,6 +124,7 @@ class DynamicPatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
     DynamicBigramListPolicy mBigramListPolicy;
     DynamicPatriciaTrieNodeReader mNodeReader;
     DynamicPatriciaTrieNodeWriter mNodeWriter;
+    DynamicPatriciaTrieUpdatingHelper mUpdatingHelper;
     int mUnigramCount;
     int mBigramCount;
     int mNeedsToDecayForTesting;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.cpp
new file mode 100644
index 000000000..cbc0d2304
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.cpp
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2013, 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.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.h"
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_reader.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_reading_helper.h"
+#include "suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_utils.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
+
+namespace latinime {
+
+const int DynamicPatriciaTrieUpdatingHelper::CHILDREN_POSITION_FIELD_SIZE = 3;
+
+bool DynamicPatriciaTrieUpdatingHelper::addUnigramWord(
+        DynamicPatriciaTrieReadingHelper *const readingHelper,
+        const int *const wordCodePoints, const int codePointCount, const int probability,
+        bool *const outAddedNewUnigram) {
+    int parentPos = NOT_A_DICT_POS;
+    while (!readingHelper->isEnd()) {
+        const PtNodeParams ptNodeParams(readingHelper->getPtNodeParams());
+        if (!ptNodeParams.isValid()) {
+            break;
+        }
+        const int matchedCodePointCount = readingHelper->getPrevTotalCodePointCount();
+        if (!readingHelper->isMatchedCodePoint(ptNodeParams, 0 /* index */,
+                wordCodePoints[matchedCodePointCount])) {
+            // The first code point is different from target code point. Skip this node and read
+            // the next sibling node.
+            readingHelper->readNextSiblingNode(ptNodeParams);
+            continue;
+        }
+        // Check following merged node code points.
+        const int nodeCodePointCount = ptNodeParams.getCodePointCount();
+        for (int j = 1; j < nodeCodePointCount; ++j) {
+            const int nextIndex = matchedCodePointCount + j;
+            if (nextIndex >= codePointCount || !readingHelper->isMatchedCodePoint(ptNodeParams, j,
+                    wordCodePoints[matchedCodePointCount + j])) {
+                *outAddedNewUnigram = true;
+                return reallocatePtNodeAndAddNewPtNodes(&ptNodeParams, j,
+                        getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */,
+                                probability),
+                        wordCodePoints + matchedCodePointCount,
+                        codePointCount - matchedCodePointCount);
+            }
+        }
+        // All characters are matched.
+        if (codePointCount == readingHelper->getTotalCodePointCount(ptNodeParams)) {
+            return setPtNodeProbability(&ptNodeParams, probability, outAddedNewUnigram);
+        }
+        if (!ptNodeParams.hasChildren()) {
+            *outAddedNewUnigram = true;
+            return createChildrenPtNodeArrayAndAChildPtNode(&ptNodeParams,
+                    getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability),
+                    wordCodePoints + readingHelper->getTotalCodePointCount(ptNodeParams),
+                    codePointCount - readingHelper->getTotalCodePointCount(ptNodeParams));
+        }
+        // Advance to the children nodes.
+        parentPos = ptNodeParams.getHeadPos();
+        readingHelper->readChildNode(ptNodeParams);
+    }
+    if (readingHelper->isError()) {
+        // The dictionary is invalid.
+        return false;
+    }
+    int pos = readingHelper->getPosOfLastForwardLinkField();
+    *outAddedNewUnigram = true;
+    return createAndInsertNodeIntoPtNodeArray(parentPos,
+            wordCodePoints + readingHelper->getPrevTotalCodePointCount(),
+            codePointCount - readingHelper->getPrevTotalCodePointCount(),
+            getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability), &pos);
+}
+
+bool DynamicPatriciaTrieUpdatingHelper::addBigramWords(const int word0Pos, const int word1Pos,
+        const int probability, bool *const outAddedNewBigram) {
+    const PtNodeParams sourcePtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word0Pos));
+    const PtNodeParams targetPtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word1Pos));
+    return mPtNodeWriter->addNewBigramEntry(&sourcePtNodeParams, &targetPtNodeParams, probability,
+            outAddedNewBigram);
+}
+
+// Remove a bigram relation from word0Pos to word1Pos.
+bool DynamicPatriciaTrieUpdatingHelper::removeBigramWords(const int word0Pos, const int word1Pos) {
+    const PtNodeParams sourcePtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word0Pos));
+    const PtNodeParams targetPtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word1Pos));
+    return mPtNodeWriter->removeBigramEntry(&sourcePtNodeParams, &targetPtNodeParams);
+}
+
+bool DynamicPatriciaTrieUpdatingHelper::createAndInsertNodeIntoPtNodeArray(const int parentPos,
+        const int *const nodeCodePoints, const int nodeCodePointCount, const int probability,
+        int *const forwardLinkFieldPos) {
+    const int newPtNodeArrayPos = mBuffer->getTailPosition();
+    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
+            newPtNodeArrayPos, forwardLinkFieldPos)) {
+        return false;
+    }
+    return createNewPtNodeArrayWithAChildPtNode(parentPos, nodeCodePoints, nodeCodePointCount,
+            probability);
+}
+
+bool DynamicPatriciaTrieUpdatingHelper::setPtNodeProbability(
+        const PtNodeParams *const originalPtNodeParams, const int probability,
+        bool *const outAddedNewUnigram) {
+    if (originalPtNodeParams->isTerminal()) {
+        // Overwrites the probability.
+        *outAddedNewUnigram = false;
+        const int probabilityToWrite = getUpdatedProbability(
+                originalPtNodeParams->getProbability(), probability);
+        return mPtNodeWriter->updatePtNodeProbability(originalPtNodeParams, probabilityToWrite);
+    } else {
+        // Make the node terminal and write the probability.
+        *outAddedNewUnigram = true;
+        const int movedPos = mBuffer->getTailPosition();
+        int writingPos = movedPos;
+        const PtNodeParams ptNodeParamsToWrite(getUpdatedPtNodeParams(originalPtNodeParams,
+                originalPtNodeParams->getParentPos(), originalPtNodeParams->getCodePointCount(),
+                originalPtNodeParams->getCodePoints(),
+                getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability)));
+        if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&ptNodeParamsToWrite, &writingPos)) {
+            return false;
+        }
+        if (!mPtNodeWriter->markPtNodeAsMoved(originalPtNodeParams, movedPos, movedPos)) {
+            return false;
+        }
+    }
+    return true;
+}
+
+bool DynamicPatriciaTrieUpdatingHelper::createChildrenPtNodeArrayAndAChildPtNode(
+        const PtNodeParams *const parentPtNodeParams, const int probability,
+        const int *const codePoints, const int codePointCount) {
+    const int newPtNodeArrayPos = mBuffer->getTailPosition();
+    if (!mPtNodeWriter->updateChildrenPosition(parentPtNodeParams, newPtNodeArrayPos)) {
+        return false;
+    }
+    return createNewPtNodeArrayWithAChildPtNode(parentPtNodeParams->getHeadPos(), codePoints,
+            codePointCount, probability);
+}
+
+bool DynamicPatriciaTrieUpdatingHelper::createNewPtNodeArrayWithAChildPtNode(
+        const int parentPtNodePos, const int *const nodeCodePoints, const int nodeCodePointCount,
+        const int probability) {
+    int writingPos = mBuffer->getTailPosition();
+    if (!DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
+            1 /* arraySize */, &writingPos)) {
+        return false;
+    }
+    const PtNodeParams ptNodeParamsToWrite(getPtNodeParamsForNewPtNode(
+            parentPtNodePos, nodeCodePointCount, nodeCodePoints, probability));
+    if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&ptNodeParamsToWrite, &writingPos)) {
+        return false;
+    }
+    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
+            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
+        return false;
+    }
+    return true;
+}
+
+// Returns whether the dictionary updating was succeeded or not.
+bool DynamicPatriciaTrieUpdatingHelper::reallocatePtNodeAndAddNewPtNodes(
+        const PtNodeParams *const reallocatingPtNodeParams, const int overlappingCodePointCount,
+        const int probabilityOfNewPtNode, const int *const newNodeCodePoints,
+        const int newNodeCodePointCount) {
+    // When addsExtraChild is true, split the reallocating PtNode and add new child.
+    // Reallocating PtNode: abcde, newNode: abcxy.
+    // abc (1st, not terminal) __ de (2nd)
+    //                         \_ xy (extra child, terminal)
+    // Otherwise, this method makes 1st part terminal and write probabilityOfNewPtNode.
+    // Reallocating PtNode: abcde, newNode: abc.
+    // abc (1st, terminal) __ de (2nd)
+    const bool addsExtraChild = newNodeCodePointCount > overlappingCodePointCount;
+    const int firstPartOfReallocatedPtNodePos = mBuffer->getTailPosition();
+    int writingPos = firstPartOfReallocatedPtNodePos;
+    // Write the 1st part of the reallocating node. The children position will be updated later
+    // with actual children position.
+    const int newProbability = addsExtraChild ? NOT_A_PROBABILITY : probabilityOfNewPtNode;
+    const PtNodeParams ptNodeParamsToWrite(getPtNodeParamsForNewPtNode(
+            reallocatingPtNodeParams->getParentPos(), overlappingCodePointCount,
+            reallocatingPtNodeParams->getCodePoints(), newProbability));
+    if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&ptNodeParamsToWrite, &writingPos)) {
+        return false;
+    }
+    const int actualChildrenPos = writingPos;
+    // Create new children PtNode array.
+    const size_t newPtNodeCount = addsExtraChild ? 2 : 1;
+    if (!DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
+            newPtNodeCount, &writingPos)) {
+        return false;
+    }
+    // Write the 2nd part of the reallocating node.
+    const int secondPartOfReallocatedPtNodePos = writingPos;
+    const PtNodeParams childPartPtNodeParams(getUpdatedPtNodeParams(reallocatingPtNodeParams,
+            firstPartOfReallocatedPtNodePos,
+            reallocatingPtNodeParams->getCodePointCount() - overlappingCodePointCount,
+            reallocatingPtNodeParams->getCodePoints() + overlappingCodePointCount,
+            reallocatingPtNodeParams->getProbability()));
+    if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&childPartPtNodeParams, &writingPos)) {
+        return false;
+    }
+    if (addsExtraChild) {
+        const PtNodeParams extraChildPtNodeParams(getPtNodeParamsForNewPtNode(
+                firstPartOfReallocatedPtNodePos, newNodeCodePointCount - overlappingCodePointCount,
+                newNodeCodePoints + overlappingCodePointCount, probabilityOfNewPtNode));
+        if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&extraChildPtNodeParams, &writingPos)) {
+            return false;
+        }
+    }
+    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
+            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
+        return false;
+    }
+    // Update original reallocating PtNode as moved.
+    if (!mPtNodeWriter->markPtNodeAsMoved(reallocatingPtNodeParams, firstPartOfReallocatedPtNodePos,
+            secondPartOfReallocatedPtNodePos)) {
+        return false;
+    }
+    // Load node info. Information of the 1st part will be fetched.
+    const PtNodeParams ptNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(firstPartOfReallocatedPtNodePos));
+    // Update children position.
+    return mPtNodeWriter->updateChildrenPosition(&ptNodeParams, actualChildrenPos);
+}
+
+int DynamicPatriciaTrieUpdatingHelper::getUpdatedProbability(const int originalProbability,
+        const int newProbability) const {
+    if (mNeedsToDecay) {
+        return ForgettingCurveUtils::getUpdatedEncodedProbability(originalProbability,
+                newProbability);
+    } else {
+        return newProbability;
+    }
+}
+
+const PtNodeParams DynamicPatriciaTrieUpdatingHelper::getUpdatedPtNodeParams(
+        const PtNodeParams *const originalPtNodeParams, const int parentPos,
+        const int codePointCount, const int *const codePoints, const int probability) const {
+    const PatriciaTrieReadingUtils::NodeFlags flags = PatriciaTrieReadingUtils::createAndGetFlags(
+            originalPtNodeParams->isBlacklisted(), originalPtNodeParams->isNotAWord(),
+            probability != NOT_A_PROBABILITY /* isTerminal */,
+            originalPtNodeParams->getShortcutPos() != NOT_A_DICT_POS /* hasShortcutTargets */,
+            originalPtNodeParams->getBigramsPos() != NOT_A_DICT_POS /* hasBigrams */,
+            codePointCount > 1 /* hasMultipleChars */, CHILDREN_POSITION_FIELD_SIZE);
+    return PtNodeParams(originalPtNodeParams, flags, parentPos, codePointCount, codePoints,
+            probability);
+}
+
+const PtNodeParams DynamicPatriciaTrieUpdatingHelper::getPtNodeParamsForNewPtNode(
+        const int parentPos, const int codePointCount, const int *const codePoints,
+        const int probability) const {
+    const PatriciaTrieReadingUtils::NodeFlags flags = PatriciaTrieReadingUtils::createAndGetFlags(
+            false /* isBlacklisted */, false /* isNotAWord */,
+            probability != NOT_A_PROBABILITY /* isTerminal */,
+            false /* hasShortcutTargets */, false /* hasBigrams */,
+            codePointCount > 1 /* hasMultipleChars */, CHILDREN_POSITION_FIELD_SIZE);
+    return PtNodeParams(flags, parentPos, codePointCount, codePoints, probability);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.h
new file mode 100644
index 000000000..b9800cd80
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_updating_helper.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2013, 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_DYNAMIC_PATRICIA_TRIE_UPDATING_HELPER_H
+#define LATINIME_DYNAMIC_PATRICIA_TRIE_UPDATING_HELPER_H
+
+#include <stdint.h>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+#include "utils/hash_map_compat.h"
+
+namespace latinime {
+
+class BufferWithExtendableBuffer;
+class DynamicPatriciaTrieReadingHelper;
+class PtNodeReader;
+class PtNodeWriter;
+
+// TODO: Move to pt_common.
+class DynamicPatriciaTrieUpdatingHelper {
+ public:
+    DynamicPatriciaTrieUpdatingHelper(BufferWithExtendableBuffer *const buffer,
+            const PtNodeReader *const ptNodeReader, PtNodeWriter *const ptNodeWriter,
+            const bool needsToDecay)
+            : mBuffer(buffer), mPtNodeReader(ptNodeReader), mPtNodeWriter(ptNodeWriter),
+              mNeedsToDecay(needsToDecay) {}
+
+    ~DynamicPatriciaTrieUpdatingHelper() {}
+
+    // Add a word to the dictionary. If the word already exists, update the probability.
+    bool addUnigramWord(DynamicPatriciaTrieReadingHelper *const readingHelper,
+            const int *const wordCodePoints, const int codePointCount, const int probability,
+            bool *const outAddedNewUnigram);
+
+    // Add a bigram relation from word0Pos to word1Pos.
+    bool addBigramWords(const int word0Pos, const int word1Pos, const int probability,
+            bool *const outAddedNewBigram);
+
+    // Remove a bigram relation from word0Pos to word1Pos.
+    bool removeBigramWords(const int word0Pos, const int word1Pos);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieUpdatingHelper);
+
+    static const int CHILDREN_POSITION_FIELD_SIZE;
+
+    BufferWithExtendableBuffer *const mBuffer;
+    const PtNodeReader *const mPtNodeReader;
+    PtNodeWriter *const mPtNodeWriter;
+    const bool mNeedsToDecay;
+
+    bool createAndInsertNodeIntoPtNodeArray(const int parentPos, const int *const nodeCodePoints,
+            const int nodeCodePointCount, const int probability, int *const forwardLinkFieldPos);
+
+    bool setPtNodeProbability(const PtNodeParams *const originalPtNodeParams, const int probability,
+            bool *const outAddedNewUnigram);
+
+    bool createChildrenPtNodeArrayAndAChildPtNode(const PtNodeParams *const parentPtNodeParams,
+            const int probability, const int *const codePoints, const int codePointCount);
+
+    bool createNewPtNodeArrayWithAChildPtNode(const int parentPos, const int *const nodeCodePoints,
+            const int nodeCodePointCount, const int probability);
+
+    bool reallocatePtNodeAndAddNewPtNodes(
+            const PtNodeParams *const reallocatingPtNodeParams, const int overlappingCodePointCount,
+            const int probabilityOfNewPtNode, const int *const newNodeCodePoints,
+            const int newNodeCodePointCount);
+
+    int getUpdatedProbability(const int originalProbability, const int newProbability) const;
+
+    const PtNodeParams getUpdatedPtNodeParams(const PtNodeParams *const originalPtNodeParams,
+            const int parentPos, const int codePointCount, const int *const codePoints,
+            const int probability) const;
+
+    const PtNodeParams getPtNodeParamsForNewPtNode(const int parentPos, const int codePointCount,
+            const int *const codePoints, const int probability) const;
+};
+} // namespace latinime
+#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_UPDATING_HELPER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.cpp
index 6a550a1af..d97cec53b 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.cpp
@@ -34,88 +34,9 @@
 
 namespace latinime {
 
-const int DynamicPatriciaTrieWritingHelper::CHILDREN_POSITION_FIELD_SIZE = 3;
 // TODO: Make MAX_DICTIONARY_SIZE 8MB.
 const size_t DynamicPatriciaTrieWritingHelper::MAX_DICTIONARY_SIZE = 2 * 1024 * 1024;
 
-bool DynamicPatriciaTrieWritingHelper::addUnigramWord(
-        DynamicPatriciaTrieReadingHelper *const readingHelper,
-        const int *const wordCodePoints, const int codePointCount, const int probability,
-        bool *const outAddedNewUnigram) {
-    int parentPos = NOT_A_DICT_POS;
-    while (!readingHelper->isEnd()) {
-        const PtNodeParams ptNodeParams(readingHelper->getPtNodeParams());
-        if (!ptNodeParams.isValid()) {
-            break;
-        }
-        const int matchedCodePointCount = readingHelper->getPrevTotalCodePointCount();
-        if (!readingHelper->isMatchedCodePoint(ptNodeParams, 0 /* index */,
-                wordCodePoints[matchedCodePointCount])) {
-            // The first code point is different from target code point. Skip this node and read
-            // the next sibling node.
-            readingHelper->readNextSiblingNode(ptNodeParams);
-            continue;
-        }
-        // Check following merged node code points.
-        const int nodeCodePointCount = ptNodeParams.getCodePointCount();
-        for (int j = 1; j < nodeCodePointCount; ++j) {
-            const int nextIndex = matchedCodePointCount + j;
-            if (nextIndex >= codePointCount || !readingHelper->isMatchedCodePoint(ptNodeParams, j,
-                    wordCodePoints[matchedCodePointCount + j])) {
-                *outAddedNewUnigram = true;
-                return reallocatePtNodeAndAddNewPtNodes(&ptNodeParams, j,
-                        getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */,
-                                probability),
-                        wordCodePoints + matchedCodePointCount,
-                        codePointCount - matchedCodePointCount);
-            }
-        }
-        // All characters are matched.
-        if (codePointCount == readingHelper->getTotalCodePointCount(ptNodeParams)) {
-            return setPtNodeProbability(&ptNodeParams, probability, outAddedNewUnigram);
-        }
-        if (!ptNodeParams.hasChildren()) {
-            *outAddedNewUnigram = true;
-            return createChildrenPtNodeArrayAndAChildPtNode(&ptNodeParams,
-                    getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability),
-                    wordCodePoints + readingHelper->getTotalCodePointCount(ptNodeParams),
-                    codePointCount - readingHelper->getTotalCodePointCount(ptNodeParams));
-        }
-        // Advance to the children nodes.
-        parentPos = ptNodeParams.getHeadPos();
-        readingHelper->readChildNode(ptNodeParams);
-    }
-    if (readingHelper->isError()) {
-        // The dictionary is invalid.
-        return false;
-    }
-    int pos = readingHelper->getPosOfLastForwardLinkField();
-    *outAddedNewUnigram = true;
-    return createAndInsertNodeIntoPtNodeArray(parentPos,
-            wordCodePoints + readingHelper->getPrevTotalCodePointCount(),
-            codePointCount - readingHelper->getPrevTotalCodePointCount(),
-            getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability), &pos);
-}
-
-bool DynamicPatriciaTrieWritingHelper::addBigramWords(const int word0Pos, const int word1Pos,
-        const int probability, bool *const outAddedNewBigram) {
-    const PtNodeParams sourcePtNodeParams(
-            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word0Pos));
-    const PtNodeParams targetPtNodeParams(
-            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word1Pos));
-    return mPtNodeWriter->addNewBigramEntry(&sourcePtNodeParams, &targetPtNodeParams, probability,
-            outAddedNewBigram);
-}
-
-// Remove a bigram relation from word0Pos to word1Pos.
-bool DynamicPatriciaTrieWritingHelper::removeBigramWords(const int word0Pos, const int word1Pos) {
-    const PtNodeParams ptNodeParams(mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word0Pos));
-    if (ptNodeParams.getBigramsPos() == NOT_A_DICT_POS) {
-        return false;
-    }
-    return mBigramPolicy->removeBigram(ptNodeParams.getBigramsPos(), word1Pos);
-}
-
 void DynamicPatriciaTrieWritingHelper::writeToDictFile(const char *const fileName,
         const HeaderPolicy *const headerPolicy, const int unigramCount, const int bigramCount) {
     BufferWithExtendableBuffer headerBuffer(
@@ -149,142 +70,6 @@ void DynamicPatriciaTrieWritingHelper::writeToDictFileWithGC(const int rootPtNod
     DictFileWritingUtils::flushAllHeaderAndBodyToFile(fileName, &headerBuffer, &newDictBuffer);
 }
 
-bool DynamicPatriciaTrieWritingHelper::createAndInsertNodeIntoPtNodeArray(const int parentPos,
-        const int *const nodeCodePoints, const int nodeCodePointCount, const int probability,
-        int *const forwardLinkFieldPos) {
-    const int newPtNodeArrayPos = mBuffer->getTailPosition();
-    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
-            newPtNodeArrayPos, forwardLinkFieldPos)) {
-        return false;
-    }
-    return createNewPtNodeArrayWithAChildPtNode(parentPos, nodeCodePoints, nodeCodePointCount,
-            probability);
-}
-
-bool DynamicPatriciaTrieWritingHelper::setPtNodeProbability(
-        const PtNodeParams *const originalPtNodeParams, const int probability,
-        bool *const outAddedNewUnigram) {
-    if (originalPtNodeParams->isTerminal()) {
-        // Overwrites the probability.
-        *outAddedNewUnigram = false;
-        const int probabilityToWrite = getUpdatedProbability(
-                originalPtNodeParams->getProbability(), probability);
-        return mPtNodeWriter->updatePtNodeProbability(originalPtNodeParams, probabilityToWrite);
-    } else {
-        // Make the node terminal and write the probability.
-        *outAddedNewUnigram = true;
-        const int movedPos = mBuffer->getTailPosition();
-        int writingPos = movedPos;
-        const PtNodeParams ptNodeParamsToWrite(getUpdatedPtNodeParams(originalPtNodeParams,
-                originalPtNodeParams->getParentPos(), originalPtNodeParams->getCodePointCount(),
-                originalPtNodeParams->getCodePoints(),
-                getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability)));
-        if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&ptNodeParamsToWrite, &writingPos)) {
-            return false;
-        }
-        if (!mPtNodeWriter->markPtNodeAsMoved(originalPtNodeParams, movedPos, movedPos)) {
-            return false;
-        }
-    }
-    return true;
-}
-
-bool DynamicPatriciaTrieWritingHelper::createChildrenPtNodeArrayAndAChildPtNode(
-        const PtNodeParams *const parentPtNodeParams, const int probability,
-        const int *const codePoints, const int codePointCount) {
-    const int newPtNodeArrayPos = mBuffer->getTailPosition();
-    if (!mPtNodeWriter->updateChildrenPosition(parentPtNodeParams, newPtNodeArrayPos)) {
-        return false;
-    }
-    return createNewPtNodeArrayWithAChildPtNode(parentPtNodeParams->getHeadPos(), codePoints,
-            codePointCount, probability);
-}
-
-bool DynamicPatriciaTrieWritingHelper::createNewPtNodeArrayWithAChildPtNode(
-        const int parentPtNodePos, const int *const nodeCodePoints, const int nodeCodePointCount,
-        const int probability) {
-    int writingPos = mBuffer->getTailPosition();
-    if (!DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
-            1 /* arraySize */, &writingPos)) {
-        return false;
-    }
-    const PtNodeParams ptNodeParamsToWrite(getPtNodeParamsForNewPtNode(
-            parentPtNodePos, nodeCodePointCount, nodeCodePoints, probability));
-    if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&ptNodeParamsToWrite, &writingPos)) {
-        return false;
-    }
-    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
-            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
-        return false;
-    }
-    return true;
-}
-
-// Returns whether the dictionary updating was succeeded or not.
-bool DynamicPatriciaTrieWritingHelper::reallocatePtNodeAndAddNewPtNodes(
-        const PtNodeParams *const reallocatingPtNodeParams, const int overlappingCodePointCount,
-        const int probabilityOfNewPtNode, const int *const newNodeCodePoints,
-        const int newNodeCodePointCount) {
-    // When addsExtraChild is true, split the reallocating PtNode and add new child.
-    // Reallocating PtNode: abcde, newNode: abcxy.
-    // abc (1st, not terminal) __ de (2nd)
-    //                         \_ xy (extra child, terminal)
-    // Otherwise, this method makes 1st part terminal and write probabilityOfNewPtNode.
-    // Reallocating PtNode: abcde, newNode: abc.
-    // abc (1st, terminal) __ de (2nd)
-    const bool addsExtraChild = newNodeCodePointCount > overlappingCodePointCount;
-    const int firstPartOfReallocatedPtNodePos = mBuffer->getTailPosition();
-    int writingPos = firstPartOfReallocatedPtNodePos;
-    // Write the 1st part of the reallocating node. The children position will be updated later
-    // with actual children position.
-    const int newProbability = addsExtraChild ? NOT_A_PROBABILITY : probabilityOfNewPtNode;
-    const PtNodeParams ptNodeParamsToWrite(getPtNodeParamsForNewPtNode(
-            reallocatingPtNodeParams->getParentPos(), overlappingCodePointCount,
-            reallocatingPtNodeParams->getCodePoints(), newProbability));
-    if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&ptNodeParamsToWrite, &writingPos)) {
-        return false;
-    }
-    const int actualChildrenPos = writingPos;
-    // Create new children PtNode array.
-    const size_t newPtNodeCount = addsExtraChild ? 2 : 1;
-    if (!DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
-            newPtNodeCount, &writingPos)) {
-        return false;
-    }
-    // Write the 2nd part of the reallocating node.
-    const int secondPartOfReallocatedPtNodePos = writingPos;
-    const PtNodeParams childPartPtNodeParams(getUpdatedPtNodeParams(reallocatingPtNodeParams,
-            firstPartOfReallocatedPtNodePos,
-            reallocatingPtNodeParams->getCodePointCount() - overlappingCodePointCount,
-            reallocatingPtNodeParams->getCodePoints() + overlappingCodePointCount,
-            reallocatingPtNodeParams->getProbability()));
-    if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&childPartPtNodeParams, &writingPos)) {
-        return false;
-    }
-    if (addsExtraChild) {
-        const PtNodeParams extraChildPtNodeParams(getPtNodeParamsForNewPtNode(
-                firstPartOfReallocatedPtNodePos, newNodeCodePointCount - overlappingCodePointCount,
-                newNodeCodePoints + overlappingCodePointCount, probabilityOfNewPtNode));
-        if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&extraChildPtNodeParams, &writingPos)) {
-            return false;
-        }
-    }
-    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
-            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
-        return false;
-    }
-    // Update original reallocating PtNode as moved.
-    if (!mPtNodeWriter->markPtNodeAsMoved(reallocatingPtNodeParams, firstPartOfReallocatedPtNodePos,
-            secondPartOfReallocatedPtNodePos)) {
-        return false;
-    }
-    // Load node info. Information of the 1st part will be fetched.
-    const PtNodeParams ptNodeParams(
-            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(firstPartOfReallocatedPtNodePos));
-    // Update children position.
-    return mPtNodeWriter->updateChildrenPosition(&ptNodeParams, actualChildrenPos);
-}
-
 // TODO: Make this method version independent.
 bool DynamicPatriciaTrieWritingHelper::runGC(const int rootPtNodeArrayPos,
         const HeaderPolicy *const headerPolicy, BufferWithExtendableBuffer *const bufferToWrite,
@@ -351,38 +136,4 @@ bool DynamicPatriciaTrieWritingHelper::runGC(const int rootPtNodeArrayPos,
     return true;
 }
 
-int DynamicPatriciaTrieWritingHelper::getUpdatedProbability(const int originalProbability,
-        const int newProbability) const {
-    if (mNeedsToDecay) {
-        return ForgettingCurveUtils::getUpdatedEncodedProbability(originalProbability,
-                newProbability);
-    } else {
-        return newProbability;
-    }
-}
-
-const PtNodeParams DynamicPatriciaTrieWritingHelper::getUpdatedPtNodeParams(
-        const PtNodeParams *const originalPtNodeParams, const int parentPos,
-        const int codePointCount, const int *const codePoints, const int probability) const {
-    const PatriciaTrieReadingUtils::NodeFlags flags = PatriciaTrieReadingUtils::createAndGetFlags(
-            originalPtNodeParams->isBlacklisted(), originalPtNodeParams->isNotAWord(),
-            probability != NOT_A_PROBABILITY /* isTerminal */,
-            originalPtNodeParams->getShortcutPos() != NOT_A_DICT_POS /* hasShortcutTargets */,
-            originalPtNodeParams->getBigramsPos() != NOT_A_DICT_POS /* hasBigrams */,
-            codePointCount > 1 /* hasMultipleChars */, CHILDREN_POSITION_FIELD_SIZE);
-    return PtNodeParams(originalPtNodeParams, flags, parentPos, codePointCount, codePoints,
-            probability);
-}
-
-const PtNodeParams DynamicPatriciaTrieWritingHelper::getPtNodeParamsForNewPtNode(
-        const int parentPos, const int codePointCount, const int *const codePoints,
-        const int probability) const {
-    const PatriciaTrieReadingUtils::NodeFlags flags = PatriciaTrieReadingUtils::createAndGetFlags(
-            false /* isBlacklisted */, false /* isNotAWord */,
-            probability != NOT_A_PROBABILITY /* isTerminal */,
-            false /* hasShortcutTargets */, false /* hasBigrams */,
-            codePointCount > 1 /* hasMultipleChars */, CHILDREN_POSITION_FIELD_SIZE);
-    return PtNodeParams(flags, parentPos, codePointCount, codePoints, probability);
-}
-
 } // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.h
index 8135f5054..7223dea8b 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v3/dynamic_patricia_trie_writing_helper.h
@@ -20,7 +20,6 @@
 #include <stdint.h>
 
 #include "defines.h"
-#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
 #include "utils/hash_map_compat.h"
 
 namespace latinime {
@@ -62,18 +61,6 @@ class DynamicPatriciaTrieWritingHelper {
 
     ~DynamicPatriciaTrieWritingHelper() {}
 
-    // Add a word to the dictionary. If the word already exists, update the probability.
-    bool addUnigramWord(DynamicPatriciaTrieReadingHelper *const readingHelper,
-            const int *const wordCodePoints, const int codePointCount, const int probability,
-            bool *const outAddedNewUnigram);
-
-    // Add a bigram relation from word0Pos to word1Pos.
-    bool addBigramWords(const int word0Pos, const int word1Pos, const int probability,
-            bool *const outAddedNewBigram);
-
-    // Remove a bigram relation from word0Pos to word1Pos.
-    bool removeBigramWords(const int word0Pos, const int word1Pos);
-
     void writeToDictFile(const char *const fileName, const HeaderPolicy *const headerPolicy,
             const int unigramCount, const int bigramCount);
 
@@ -83,8 +70,6 @@ class DynamicPatriciaTrieWritingHelper {
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieWritingHelper);
 
-    static const int CHILDREN_POSITION_FIELD_SIZE;
-
     BufferWithExtendableBuffer *const mBuffer;
     const PtNodeReader *const mPtNodeReader;
     PtNodeWriter *const mPtNodeWriter;
@@ -92,35 +77,9 @@ class DynamicPatriciaTrieWritingHelper {
     DynamicShortcutListPolicy *const mShortcutPolicy;
     const bool mNeedsToDecay;
 
-    bool createAndInsertNodeIntoPtNodeArray(const int parentPos, const int *const nodeCodePoints,
-            const int nodeCodePointCount, const int probability, int *const forwardLinkFieldPos);
-
-    bool setPtNodeProbability(const PtNodeParams *const originalPtNodeParams, const int probability,
-            bool *const outAddedNewUnigram);
-
-    bool createChildrenPtNodeArrayAndAChildPtNode(const PtNodeParams *const parentPtNodeParams,
-            const int probability, const int *const codePoints, const int codePointCount);
-
-    bool createNewPtNodeArrayWithAChildPtNode(const int parentPos, const int *const nodeCodePoints,
-            const int nodeCodePointCount, const int probability);
-
-    bool reallocatePtNodeAndAddNewPtNodes(
-            const PtNodeParams *const reallocatingPtNodeParams, const int overlappingCodePointCount,
-            const int probabilityOfNewPtNode, const int *const newNodeCodePoints,
-            const int newNodeCodePointCount);
-
     bool runGC(const int rootPtNodeArrayPos, const HeaderPolicy *const headerPolicy,
             BufferWithExtendableBuffer *const bufferToWrite, int *const outUnigramCount,
             int *const outBigramCount);
-
-    int getUpdatedProbability(const int originalProbability, const int newProbability) const;
-
-    const PtNodeParams getUpdatedPtNodeParams(const PtNodeParams *const originalPtNodeParams,
-            const int parentPos, const int codePointCount, const int *const codePoints,
-            const int probability) const;
-
-    const PtNodeParams getPtNodeParamsForNewPtNode(const int parentPos, const int codePointCount,
-            const int *const codePoints, const int probability) const;
 };
 } // namespace latinime
 #endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_HELPER_H */