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diff --git a/native/jni/src/proximity_info_state_utils.h b/native/jni/src/proximity_info_state_utils.h
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+/*
+ * 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_PROXIMITY_INFO_STATE_UTILS_H
+#define LATINIME_PROXIMITY_INFO_STATE_UTILS_H
+
+#include <bitset>
+#include <vector>
+
+#include "defines.h"
+#include "hash_map_compat.h"
+
+namespace latinime {
+class ProximityInfo;
+class ProximityInfoParams;
+
+class ProximityInfoStateUtils {
+ public:
+    typedef hash_map_compat<int, float> NearKeysDistanceMap;
+    typedef std::bitset<MAX_KEY_COUNT_IN_A_KEYBOARD> NearKeycodesSet;
+
+    static int trimLastTwoTouchPoints(std::vector<int> *sampledInputXs,
+            std::vector<int> *sampledInputYs, std::vector<int> *sampledInputTimes,
+            std::vector<int> *sampledLengthCache, std::vector<int> *sampledInputIndice);
+    static int updateTouchPoints(const ProximityInfo *const proximityInfo,
+            const int maxPointToKeyLength, const int *const inputProximities,
+            const int *const inputXCoordinates, const int *const inputYCoordinates,
+            const int *const times, const int *const pointerIds, const int inputSize,
+            const bool isGeometric, const int pointerId, const int pushTouchPointStartIndex,
+            std::vector<int> *sampledInputXs, std::vector<int> *sampledInputYs,
+            std::vector<int> *sampledInputTimes, std::vector<int> *sampledLengthCache,
+            std::vector<int> *sampledInputIndice);
+    static const int *getProximityCodePointsAt(const int *const inputProximities, const int index);
+    static int getPrimaryCodePointAt(const int *const inputProximities, const int index);
+    static void popInputData(std::vector<int> *sampledInputXs, std::vector<int> *sampledInputYs,
+            std::vector<int> *sampledInputTimes, std::vector<int> *sampledLengthCache,
+            std::vector<int> *sampledInputIndice);
+    static float refreshSpeedRates(const int inputSize, const int *const xCoordinates,
+            const int *const yCoordinates, const int *const times, const int lastSavedInputSize,
+            const int sampledInputSize, const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs,
+            const std::vector<int> *const sampledInputTimes,
+            const std::vector<int> *const sampledLengthCache,
+            const std::vector<int> *const sampledInputIndice,
+            std::vector<float> *sampledSpeedRates, std::vector<float> *sampledDirections);
+    static void refreshBeelineSpeedRates(const int mostCommonKeyWidth,  const float averageSpeed,
+            const int inputSize, const int *const xCoordinates, const int *const yCoordinates,
+            const int *times, const int sampledInputSize,
+            const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs, const std::vector<int> *const inputIndice,
+            std::vector<int> *beelineSpeedPercentiles);
+    static float getDirection(const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs, const int index0, const int index1);
+    static void updateAlignPointProbabilities(const float maxPointToKeyLength,
+            const int mostCommonKeyWidth, const int keyCount, const int start,
+            const int sampledInputSize, const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs,
+            const std::vector<float> *const sampledSpeedRates,
+            const std::vector<int> *const sampledLengthCache,
+            const std::vector<float> *const SampledDistanceCache_G,
+            std::vector<NearKeycodesSet> *SampledNearKeySets,
+            std::vector<hash_map_compat<int, float> > *charProbabilities);
+    static void updateSampledSearchKeySets(const ProximityInfo *const proximityInfo,
+            const int sampledInputSize, const int lastSavedInputSize,
+            const std::vector<int> *const sampledLengthCache,
+            const std::vector<NearKeycodesSet> *const SampledNearKeySets,
+            std::vector<NearKeycodesSet> *sampledSearchKeySets,
+            std::vector<std::vector<int> > *sampledSearchKeyVectors);
+    static float getPointToKeyByIdLength(const float maxPointToKeyLength,
+            const std::vector<float> *const SampledDistanceCache_G, const int keyCount,
+            const int inputIndex, const int keyId);
+    static void initGeometricDistanceInfos(const ProximityInfo *const proximityInfo,
+            const int sampledInputSize, const int lastSavedInputSize,
+            const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs,
+            std::vector<NearKeycodesSet> *SampledNearKeySets,
+            std::vector<float> *SampledDistanceCache_G);
+    static void initPrimaryInputWord(const int inputSize, const int *const inputProximities,
+            int *primaryInputWord);
+    static void initNormalizedSquaredDistances(const ProximityInfo *const proximityInfo,
+            const int inputSize, const int *inputXCoordinates, const int *inputYCoordinates,
+            const int *const inputProximities, const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs, int *normalizedSquaredDistances);
+    static void dump(const bool isGeometric, const int inputSize,
+            const int *const inputXCoordinates, const int *const inputYCoordinates,
+            const int sampledInputSize, const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs,
+            const std::vector<int> *const sampledTimes,
+            const std::vector<float> *const sampledSpeedRates,
+            const std::vector<int> *const sampledBeelineSpeedPercentiles);
+    static bool checkAndReturnIsContinuationPossible(const int inputSize,
+            const int *const xCoordinates, const int *const yCoordinates, const int *const times,
+            const int sampledInputSize, const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs,
+            const std::vector<int> *const sampledTimes,
+            const std::vector<int> *const sampledInputIndices);
+    // TODO: Move to most_probable_string_utils.h
+    static float getMostProbableString(const ProximityInfo *const proximityInfo,
+            const int sampledInputSize,
+            const std::vector<hash_map_compat<int, float> > *const charProbabilities,
+            int *const codePointBuf);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(ProximityInfoStateUtils);
+
+    static float updateNearKeysDistances(const ProximityInfo *const proximityInfo,
+            const float maxPointToKeyLength, const int x, const int y,
+            NearKeysDistanceMap *const currentNearKeysDistances);
+    static bool isPrevLocalMin(const NearKeysDistanceMap *const currentNearKeysDistances,
+            const NearKeysDistanceMap *const prevNearKeysDistances,
+            const NearKeysDistanceMap *const prevPrevNearKeysDistances);
+    static float getPointScore(const int mostCommonKeyWidth, const int x, const int y,
+            const int time, const bool lastPoint, const float nearest, const float sumAngle,
+            const NearKeysDistanceMap *const currentNearKeysDistances,
+            const NearKeysDistanceMap *const prevNearKeysDistances,
+            const NearKeysDistanceMap *const prevPrevNearKeysDistances,
+            std::vector<int> *sampledInputXs, std::vector<int> *sampledInputYs);
+    static bool pushTouchPoint(const ProximityInfo *const proximityInfo,
+            const int maxPointToKeyLength, const int inputIndex, const int nodeCodePoint, int x,
+            int y, const int time, const bool doSampling, const bool isLastPoint,
+            const float sumAngle, NearKeysDistanceMap *const currentNearKeysDistances,
+            const NearKeysDistanceMap *const prevNearKeysDistances,
+            const NearKeysDistanceMap *const prevPrevNearKeysDistances,
+            std::vector<int> *sampledInputXs, std::vector<int> *sampledInputYs,
+            std::vector<int> *sampledInputTimes, std::vector<int> *sampledLengthCache,
+            std::vector<int> *sampledInputIndice);
+    static float calculateBeelineSpeedRate(const int mostCommonKeyWidth, const float averageSpeed,
+            const int id, const int inputSize, const int *const xCoordinates,
+            const int *const yCoordinates, const int *times, const int sampledInputSize,
+            const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs,
+            const std::vector<int> *const inputIndice);
+    static float getPointAngle(const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs, const int index);
+    static float getPointsAngle(const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs, const int index0, const int index1,
+            const int index2);
+    static bool suppressCharProbabilities(const int mostCommonKeyWidth,
+            const int sampledInputSize, const std::vector<int> *const lengthCache, const int index0,
+            const int index1, std::vector<hash_map_compat<int, float> > *charProbabilities);
+    static float calculateSquaredDistanceFromSweetSpotCenter(
+            const ProximityInfo *const proximityInfo, const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs, const int keyIndex,
+            const int inputIndex);
+     static float calculateNormalizedSquaredDistance(const ProximityInfo *const proximityInfo,
+            const std::vector<int> *const sampledInputXs,
+            const std::vector<int> *const sampledInputYs, const int keyIndex, const int inputIndex);
+};
+} // namespace latinime
+#endif // LATINIME_PROXIMITY_INFO_STATE_UTILS_H