diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
index 47ace23a1..9a32f64d4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
@@ -25,7 +25,7 @@ namespace latinime {
 const char *const HeaderPolicy::MULTIPLE_WORDS_DEMOTION_RATE_KEY = "MULTIPLE_WORDS_DEMOTION_RATE";
 const char *const HeaderPolicy::USES_FORGETTING_CURVE_KEY = "USES_FORGETTING_CURVE";
 const char *const HeaderPolicy::LAST_UPDATED_TIME_KEY = "date";
-const float HeaderPolicy::DEFAULT_MULTIPLE_WORD_COST_MULTIPLIER = 1.0f;
+const int HeaderPolicy::DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE = 100;
 const float HeaderPolicy::MULTIPLE_WORD_COST_MULTIPLIER_SCALE = 100.0f;
 
 // Used for logging. Question mark is used to indicate that the key is not found.
@@ -37,7 +37,7 @@ void HeaderPolicy::readHeaderValueOrQuestionMark(const char *const key, int *out
         return;
     }
     std::vector<int> keyCodePointVector;
-    insertCharactersIntoVector(key, &keyCodePointVector);
+    HeaderReadWriteUtils::insertCharactersIntoVector(key, &keyCodePointVector);
     HeaderReadWriteUtils::AttributeMap::const_iterator it = mAttributeMap.find(keyCodePointVector);
     if (it == mAttributeMap.end()) {
         // The key was not found.
@@ -53,47 +53,29 @@ void HeaderPolicy::readHeaderValueOrQuestionMark(const char *const key, int *out
 }
 
 float HeaderPolicy::readMultipleWordCostMultiplier() const {
-    int attributeValue = 0;
-    if (getAttributeValueAsInt(MULTIPLE_WORDS_DEMOTION_RATE_KEY, &attributeValue)) {
-        if (attributeValue <= 0) {
-            return static_cast<float>(MAX_VALUE_FOR_WEIGHTING);
-        }
-        return MULTIPLE_WORD_COST_MULTIPLIER_SCALE / static_cast<float>(attributeValue);
-    } else {
-        return DEFAULT_MULTIPLE_WORD_COST_MULTIPLIER;
+    std::vector<int> keyVector;
+    HeaderReadWriteUtils::insertCharactersIntoVector(MULTIPLE_WORDS_DEMOTION_RATE_KEY, &keyVector);
+    const int demotionRate = HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
+            &keyVector, DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE);
+    if (demotionRate <= 0) {
+        return static_cast<float>(MAX_VALUE_FOR_WEIGHTING);
     }
+    return MULTIPLE_WORD_COST_MULTIPLIER_SCALE / static_cast<float>(demotionRate);
 }
 
 bool HeaderPolicy::readUsesForgettingCurveFlag() const {
-    int attributeValue = 0;
-    if (getAttributeValueAsInt(USES_FORGETTING_CURVE_KEY, &attributeValue)) {
-        return attributeValue != 0;
-    } else {
-        return false;
-    }
-}
-
-// Returns S_INT_MIN when the key is not found or the value is invalid.
-int HeaderPolicy::readLastUpdatedTime() const {
-    int attributeValue = 0;
-    if (getAttributeValueAsInt(LAST_UPDATED_TIME_KEY, &attributeValue)) {
-        return attributeValue;
-    } else {
-        return S_INT_MIN;
-    }
-}
-
-// Returns whether the key is found or not and stores the found value into outValue.
-bool HeaderPolicy::getAttributeValueAsInt(const char *const key, int *const outValue) const {
     std::vector<int> keyVector;
-    insertCharactersIntoVector(key, &keyVector);
-    HeaderReadWriteUtils::AttributeMap::const_iterator it = mAttributeMap.find(keyVector);
-    if (it == mAttributeMap.end()) {
-        // The key was not found.
-        return false;
-    }
-    *outValue = parseIntAttributeValue(&(it->second));
-    return true;
+    HeaderReadWriteUtils::insertCharactersIntoVector(USES_FORGETTING_CURVE_KEY, &keyVector);
+    return HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap, &keyVector,
+            false /* defaultValue */);
+}
+
+// Returns current time when the key is not found or the value is invalid.
+int HeaderPolicy::readLastUpdatedTime() const {
+    std::vector<int> keyVector;
+    HeaderReadWriteUtils::insertCharactersIntoVector(LAST_UPDATED_TIME_KEY, &keyVector);
+    return HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap, &keyVector,
+            time(0) /* defaultValue */);
 }
 
 bool HeaderPolicy::writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
@@ -117,13 +99,8 @@ bool HeaderPolicy::writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferT
         // Set current time as a last updated time.
         HeaderReadWriteUtils::AttributeMap attributeMapTowrite(mAttributeMap);
         std::vector<int> updatedTimekey;
-        insertCharactersIntoVector(LAST_UPDATED_TIME_KEY, &updatedTimekey);
-        const time_t currentTime = time(NULL);
-        std::vector<int> updatedTimeValue;
-        char charBuf[LARGEST_INT_DIGIT_COUNT + 1];
-        snprintf(charBuf, LARGEST_INT_DIGIT_COUNT + 1, "%ld", currentTime);
-        insertCharactersIntoVector(charBuf, &updatedTimeValue);
-        attributeMapTowrite[updatedTimekey] = updatedTimeValue;
+        HeaderReadWriteUtils::insertCharactersIntoVector(LAST_UPDATED_TIME_KEY, &updatedTimekey);
+        HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, &updatedTimekey, time(0));
         if (!HeaderReadWriteUtils::writeHeaderAttributes(bufferToWrite, &attributeMapTowrite,
                 &writingPos)) {
             return false;
@@ -149,30 +126,4 @@ bool HeaderPolicy::writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferT
     return attributeMap;
 }
 
-/* static */ int HeaderPolicy::parseIntAttributeValue(
-        const std::vector<int> *const attributeValue) {
-    int value = 0;
-    bool isNegative = false;
-    for (size_t i = 0; i < attributeValue->size(); ++i) {
-        if (i == 0 && attributeValue->at(i) == '-') {
-            isNegative = true;
-        } else {
-            if (!isdigit(attributeValue->at(i))) {
-                // If not a number, return S_INT_MIN
-                return S_INT_MIN;
-            }
-            value *= 10;
-            value += attributeValue->at(i) - '0';
-        }
-    }
-    return isNegative ? -value : value;
-}
-
-/* static */ void HeaderPolicy::insertCharactersIntoVector(const char *const characters,
-        std::vector<int> *const vector) {
-    for (int i = 0; characters[i]; ++i) {
-        vector->push_back(characters[i]);
-    }
-}
-
 } // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
index 6b396f3f2..e97c08ca4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
@@ -17,7 +17,6 @@
 #ifndef LATINIME_HEADER_POLICY_H
 #define LATINIME_HEADER_POLICY_H
 
-#include <cctype>
 #include <stdint.h>
 
 #include "defines.h"
@@ -29,16 +28,26 @@ namespace latinime {
 
 class HeaderPolicy : public DictionaryHeaderStructurePolicy {
  public:
-    explicit HeaderPolicy(const uint8_t *const dictBuf, const int dictSize)
-            : mDictBuf(dictBuf),
-              mDictFormatVersion(FormatUtils::detectFormatVersion(dictBuf, dictSize)),
+    // Reads information from existing dictionary buffer.
+    HeaderPolicy(const uint8_t *const dictBuf, const int dictSize)
+            : mDictFormatVersion(FormatUtils::detectFormatVersion(dictBuf, dictSize)),
               mDictionaryFlags(HeaderReadWriteUtils::getFlags(dictBuf)),
               mSize(HeaderReadWriteUtils::getHeaderSize(dictBuf)),
-              mAttributeMap(createAttributeMapAndReadAllAttributes(mDictBuf)),
+              mAttributeMap(createAttributeMapAndReadAllAttributes(dictBuf)),
               mMultiWordCostMultiplier(readMultipleWordCostMultiplier()),
               mUsesForgettingCurve(readUsesForgettingCurveFlag()),
               mLastUpdatedTime(readLastUpdatedTime()) {}
 
+    // Constructs header information using an attribute map.
+    HeaderPolicy(const FormatUtils::FORMAT_VERSION dictFormatVersion,
+            const HeaderReadWriteUtils::AttributeMap *const attributeMap)
+            : mDictFormatVersion(dictFormatVersion),
+              mDictionaryFlags(HeaderReadWriteUtils::createAndGetDictionaryFlagsUsingAttributeMap(
+                      attributeMap)), mSize(0), mAttributeMap(*attributeMap),
+              mMultiWordCostMultiplier(readUsesForgettingCurveFlag()),
+              mUsesForgettingCurve(readUsesForgettingCurveFlag()),
+              mLastUpdatedTime(readLastUpdatedTime()) {}
+
     ~HeaderPolicy() {}
 
     AK_FORCE_INLINE int getSize() const {
@@ -81,10 +90,9 @@ class HeaderPolicy : public DictionaryHeaderStructurePolicy {
     static const char *const MULTIPLE_WORDS_DEMOTION_RATE_KEY;
     static const char *const USES_FORGETTING_CURVE_KEY;
     static const char *const LAST_UPDATED_TIME_KEY;
-    static const float DEFAULT_MULTIPLE_WORD_COST_MULTIPLIER;
+    static const int DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE;
     static const float MULTIPLE_WORD_COST_MULTIPLIER_SCALE;
 
-    const uint8_t *const mDictBuf;
     const FormatUtils::FORMAT_VERSION mDictFormatVersion;
     const HeaderReadWriteUtils::DictionaryFlags mDictionaryFlags;
     const int mSize;
@@ -99,15 +107,8 @@ class HeaderPolicy : public DictionaryHeaderStructurePolicy {
 
     int readLastUpdatedTime() const;
 
-    bool getAttributeValueAsInt(const char *const key, int *const outValue) const;
-
     static HeaderReadWriteUtils::AttributeMap createAttributeMapAndReadAllAttributes(
             const uint8_t *const dictBuf);
-
-    static int parseIntAttributeValue(const std::vector<int> *const attributeValue);
-
-    static void insertCharactersIntoVector(
-            const char *const characters, std::vector<int> *const vector);
 };
 } // namespace latinime
 #endif /* LATINIME_HEADER_POLICY_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp
index 80fe88671..e6547675c 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp
@@ -16,6 +16,8 @@
 
 #include "suggest/policyimpl/dictionary/header/header_read_write_utils.h"
 
+#include <cctype>
+#include <cstdio>
 #include <vector>
 
 #include "defines.h"
@@ -43,6 +45,12 @@ const HeaderReadWriteUtils::DictionaryFlags
 const HeaderReadWriteUtils::DictionaryFlags
         HeaderReadWriteUtils::FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
 
+const char *const HeaderReadWriteUtils::SUPPORTS_DYNAMIC_UPDATE_KEY = "SUPPORTS_DYNAMIC_UPDATE";
+const char *const HeaderReadWriteUtils::REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY =
+        "REQUIRES_GERMAN_UMLAUT_PROCESSING";
+const char *const HeaderReadWriteUtils::REQUIRES_FRENCH_LIGATURE_PROCESSING_KEY =
+        "REQUIRES_FRENCH_LIGATURE_PROCESSING";
+
 /* static */ int HeaderReadWriteUtils::getHeaderSize(const uint8_t *const dictBuf) {
     // See the format of the header in the comment in
     // BinaryDictionaryFormatUtils::detectFormatVersion()
@@ -56,6 +64,28 @@ const HeaderReadWriteUtils::DictionaryFlags
             HEADER_MAGIC_NUMBER_SIZE + HEADER_DICTIONARY_VERSION_SIZE);
 }
 
+/* static */ HeaderReadWriteUtils::DictionaryFlags
+        HeaderReadWriteUtils::createAndGetDictionaryFlagsUsingAttributeMap(
+                const HeaderReadWriteUtils::AttributeMap *const attributeMap) {
+    AttributeMap::key_type key;
+    insertCharactersIntoVector(REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY, &key);
+    const bool requiresGermanUmlautProcessing = readBoolAttributeValue(attributeMap, &key,
+            false /* defaultValue */);
+    key.clear();
+    insertCharactersIntoVector(REQUIRES_FRENCH_LIGATURE_PROCESSING_KEY, &key);
+    const bool requiresFrenchLigatureProcessing = readBoolAttributeValue(attributeMap, &key,
+            false /* defaultValue */);
+    key.clear();
+    insertCharactersIntoVector(SUPPORTS_DYNAMIC_UPDATE_KEY, &key);
+    const bool supportsDynamicUpdate = readBoolAttributeValue(attributeMap, &key,
+            false /* defaultValue */);
+    DictionaryFlags dictflags = NO_FLAGS;
+    dictflags |= requiresGermanUmlautProcessing ? GERMAN_UMLAUT_PROCESSING_FLAG : 0;
+    dictflags |= requiresFrenchLigatureProcessing ? FRENCH_LIGATURE_PROCESSING_FLAG : 0;
+    dictflags |= supportsDynamicUpdate ? SUPPORTS_DYNAMIC_UPDATE_FLAG : 0;
+    return dictflags;
+}
+
 /* static */ void HeaderReadWriteUtils::fetchAllHeaderAttributes(const uint8_t *const dictBuf,
         AttributeMap *const headerAttributes) {
     const int headerSize = getHeaderSize(dictBuf);
@@ -128,4 +158,57 @@ const HeaderReadWriteUtils::DictionaryFlags
     return true;
 }
 
+/* static */ void HeaderReadWriteUtils::setBoolAttribute(AttributeMap *const headerAttributes,
+        const AttributeMap::key_type *const key, const bool value) {
+    setIntAttribute(headerAttributes, key, value ? 1 : 0);
+}
+
+/* static */ void HeaderReadWriteUtils::setIntAttribute(AttributeMap *const headerAttributes,
+        const AttributeMap::key_type *const key, const int value) {
+    AttributeMap::mapped_type valueVector;
+    char charBuf[LARGEST_INT_DIGIT_COUNT + 1];
+    snprintf(charBuf, LARGEST_INT_DIGIT_COUNT + 1, "%d", value);
+    insertCharactersIntoVector(charBuf, &valueVector);
+    (*headerAttributes)[*key] = valueVector;
+}
+
+/* static */ bool HeaderReadWriteUtils::readBoolAttributeValue(
+        const AttributeMap *const headerAttributes, const AttributeMap::key_type *const key,
+        const bool defaultValue) {
+    const int intDefaultValue = defaultValue ? 1 : 0;
+    const int intValue = readIntAttributeValue(headerAttributes, key, intDefaultValue);
+    return intValue != 0;
+}
+
+/* static */ int HeaderReadWriteUtils::readIntAttributeValue(
+        const AttributeMap *const headerAttributes, const AttributeMap::key_type *const key,
+        const int defaultValue) {
+    AttributeMap::const_iterator it = headerAttributes->find(*key);
+    if (it != headerAttributes->end()) {
+        int value = 0;
+        bool isNegative = false;
+        for (size_t i = 0; i < it->second.size(); ++i) {
+            if (i == 0 && it->second.at(i) == '-') {
+                isNegative = true;
+            } else {
+                if (!isdigit(it->second.at(i))) {
+                    // If not a number.
+                    return defaultValue;
+                }
+                value *= 10;
+                value += it->second.at(i) - '0';
+            }
+        }
+        return isNegative ? -value : value;
+    }
+    return defaultValue;
+}
+
+/* static */ void HeaderReadWriteUtils::insertCharactersIntoVector(const char *const characters,
+        std::vector<int> *const vector) {
+    for (int i = 0; characters[i]; ++i) {
+        vector->push_back(characters[i]);
+    }
+}
+
 } // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h
index 6cce73375..caa5097f6 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h
@@ -54,6 +54,9 @@ class HeaderReadWriteUtils {
                 + HEADER_SIZE_FIELD_SIZE;
     }
 
+    static DictionaryFlags createAndGetDictionaryFlagsUsingAttributeMap(
+            const HeaderReadWriteUtils::AttributeMap *const attributeMap);
+
     static void fetchAllHeaderAttributes(const uint8_t *const dictBuf,
             AttributeMap *const headerAttributes);
 
@@ -69,6 +72,24 @@ class HeaderReadWriteUtils {
     static bool writeHeaderAttributes(BufferWithExtendableBuffer *const buffer,
             const AttributeMap *const headerAttributes, int *const writingPos);
 
+    /**
+     * Methods for header attributes.
+     */
+    static void setBoolAttribute(AttributeMap *const headerAttributes,
+            const AttributeMap::key_type *const key, const bool value);
+
+    static void setIntAttribute(AttributeMap *const headerAttributes,
+            const AttributeMap::key_type *const key, const int value);
+
+    static bool readBoolAttributeValue(const AttributeMap *const headerAttributes,
+            const AttributeMap::key_type *const key, const bool defaultValue);
+
+    static int readIntAttributeValue(const AttributeMap *const headerAttributes,
+            const AttributeMap::key_type *const key, const int defaultValue);
+
+    static void insertCharactersIntoVector(const char *const characters,
+            AttributeMap::key_type *const key);
+
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(HeaderReadWriteUtils);
 
@@ -87,7 +108,10 @@ class HeaderReadWriteUtils {
     static const DictionaryFlags GERMAN_UMLAUT_PROCESSING_FLAG;
     static const DictionaryFlags SUPPORTS_DYNAMIC_UPDATE_FLAG;
     static const DictionaryFlags FRENCH_LIGATURE_PROCESSING_FLAG;
-    static const DictionaryFlags CONTAINS_BIGRAMS_FLAG;
+
+    static const char *const SUPPORTS_DYNAMIC_UPDATE_KEY;
+    static const char *const REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY;
+    static const char *const REQUIRES_FRENCH_LIGATURE_PROCESSING_KEY;
 };
 }
 #endif /* LATINIME_HEADER_READ_WRITE_UTILS_H */