1 files changed, 14 insertions, 18 deletions

diff --git a/native/jni/src/additional_proximity_chars.h b/native/jni/src/additional_proximity_chars.h
index e0ecc0e1d..d420c4664 100644
--- a/native/jni/src/additional_proximity_chars.h
+++ b/native/jni/src/additional_proximity_chars.h
@@ -17,8 +17,8 @@
 #ifndef LATINIME_ADDITIONAL_PROXIMITY_CHARS_H
 #define LATINIME_ADDITIONAL_PROXIMITY_CHARS_H
 
+#include <cstring>
 #include <stdint.h>
-#include <string>
 
 #include "defines.h"
 
@@ -26,7 +26,8 @@ namespace latinime {
 
 class AdditionalProximityChars {
  private:
-    static const std::string LOCALE_EN_US;
+    DISALLOW_IMPLICIT_CONSTRUCTORS(AdditionalProximityChars);
+    static const char *LOCALE_EN_US;
     static const int EN_US_ADDITIONAL_A_SIZE = 4;
     static const int32_t EN_US_ADDITIONAL_A[];
     static const int EN_US_ADDITIONAL_E_SIZE = 4;
@@ -38,17 +39,18 @@ class AdditionalProximityChars {
     static const int EN_US_ADDITIONAL_U_SIZE = 4;
     static const int32_t EN_US_ADDITIONAL_U[];
 
-    static bool isEnLocale(const std::string *locale_str) {
-        return locale_str && locale_str->size() >= LOCALE_EN_US.size()
-                && LOCALE_EN_US.compare(0, LOCALE_EN_US.size(), *locale_str);
+    static bool isEnLocale(const char *localeStr) {
+        const size_t LOCALE_EN_US_SIZE = strlen(LOCALE_EN_US);
+        return localeStr && strlen(localeStr) >= LOCALE_EN_US_SIZE
+                && strncmp(localeStr, LOCALE_EN_US, LOCALE_EN_US_SIZE) == 0;
     }
 
  public:
-    static int getAdditionalCharsSize(const std::string* locale_str, const int32_t c) {
-        if (!isEnLocale(locale_str)) {
+    static int getAdditionalCharsSize(const char *localeStr, const int32_t c) {
+        if (!isEnLocale(localeStr)) {
             return 0;
         }
-        switch(c) {
+        switch (c) {
         case 'a':
             return EN_US_ADDITIONAL_A_SIZE;
         case 'e':
@@ -64,11 +66,11 @@ class AdditionalProximityChars {
         }
     }
 
-    static const int32_t* getAdditionalChars(const std::string *locale_str, const int32_t c) {
-        if (!isEnLocale(locale_str)) {
+    static const int32_t *getAdditionalChars(const char *localeStr, const int32_t c) {
+        if (!isEnLocale(localeStr)) {
             return 0;
         }
-        switch(c) {
+        switch (c) {
         case 'a':
             return EN_US_ADDITIONAL_A;
         case 'e':
@@ -83,12 +85,6 @@ class AdditionalProximityChars {
             return 0;
         }
     }
-
-    static bool hasAdditionalChars(const std::string *locale_str, const int32_t c) {
-        return getAdditionalCharsSize(locale_str, c) > 0;
-    }
 };
-
-}
-
+} // namespace latinime
 #endif // LATINIME_ADDITIONAL_PROXIMITY_CHARS_H