diff --git a/app/src/main/java/org/solovyev/android/calculator/ButtonOnClickListener.java b/app/src/main/java/org/solovyev/android/calculator/ButtonOnClickListener.java
index 01f2759e..d5a818c0 100644
--- a/app/src/main/java/org/solovyev/android/calculator/ButtonOnClickListener.java
+++ b/app/src/main/java/org/solovyev/android/calculator/ButtonOnClickListener.java
@@ -76,7 +76,7 @@ final class ButtonOnClickListener implements View.OnClickListener {
     }
 
     private void onClick(@Nonnull View v, @Nonnull CppSpecialButton b) {
-        onClick(v, b.getActionCode());
+        onClick(v, b.action);
     }
 
     private void onClick(@Nonnull View v, @Nonnull String s) {
diff --git a/app/src/main/java/org/solovyev/android/calculator/Keyboard.java b/app/src/main/java/org/solovyev/android/calculator/Keyboard.java
index d890ba3d..a1dd9c0e 100644
--- a/app/src/main/java/org/solovyev/android/calculator/Keyboard.java
+++ b/app/src/main/java/org/solovyev/android/calculator/Keyboard.java
@@ -58,10 +58,7 @@ public class Keyboard {
             return false;
         }
         App.getGa().onButtonPressed(text);
-        // process special buttons
-        boolean processed = processSpecialButtons(text);
-
-        if (!processed) {
+        if (!processSpecialAction(text)) {
             processText(prepareText(text));
         }
         return true;
@@ -104,16 +101,13 @@ public class Keyboard {
         }
     }
 
-    private boolean processSpecialButtons(@Nonnull String text) {
-        boolean result = false;
-
-        final CppSpecialButton button = CppSpecialButton.getByActionCode(text);
-        if (button != null) {
-            button.onClick(this);
-            result = true;
+    private boolean processSpecialAction(@Nonnull String action) {
+        final CppSpecialButton button = CppSpecialButton.getByAction(action);
+        if (button == null) {
+            return false;
         }
-
-        return result;
+        button.onClick(this);
+        return true;
     }
 
     public void roundBracketsButtonPressed() {
diff --git a/app/src/main/java/org/solovyev/android/calculator/buttons/CppButton.java b/app/src/main/java/org/solovyev/android/calculator/buttons/CppButton.java
index 09719f1f..2db37351 100644
--- a/app/src/main/java/org/solovyev/android/calculator/buttons/CppButton.java
+++ b/app/src/main/java/org/solovyev/android/calculator/buttons/CppButton.java
@@ -94,8 +94,8 @@ public enum CppButton {
     @Nullable
     public final String actionLong;
 
-    CppButton(int id, @Nonnull CppSpecialButton onClickButton, @Nullable CppSpecialButton onLongClickButton) {
-        this(id, onClickButton.getActionCode(), onLongClickButton == null ? null : onLongClickButton.getActionCode());
+    CppButton(int id, @Nonnull CppSpecialButton button, @Nullable CppSpecialButton buttonLong) {
+        this(id, button.action, buttonLong == null ? null : buttonLong.getAction());
     }
 
     CppButton(int id, @Nonnull CppSpecialButton onClickButton) {
@@ -121,10 +121,11 @@ public enum CppButton {
 
     private static void initButtonsByIdsMap() {
         Check.isMainThread();
-        if (buttonsByIds.size() == 0) {
-            for (CppButton button : values()) {
-                buttonsByIds.append(button.id, button);
-            }
+        if (buttonsByIds.size() != 0) {
+            return;
+        }
+        for (CppButton button : values()) {
+            buttonsByIds.append(button.id, button);
         }
     }
 }
diff --git a/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java b/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java
index 65bf9bf8..29ba892c 100644
--- a/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java
+++ b/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java
@@ -22,6 +22,7 @@
 
 package org.solovyev.android.calculator.buttons;
 
+import org.solovyev.android.Check;
 import org.solovyev.android.calculator.App;
 import org.solovyev.android.calculator.Calculator;
 import org.solovyev.android.calculator.CalculatorEventType;
@@ -170,39 +171,34 @@ public enum CppSpecialButton {
     };
 
     @Nonnull
-    private static Map<String, CppSpecialButton> buttonsByActionCodes = new HashMap<>();
+    private static Map<String, CppSpecialButton> buttonsByActions = new HashMap<>();
 
     @Nonnull
-    private final String actionCode;
+    public final String action;
 
-    CppSpecialButton(@Nonnull String actionCode) {
-        this.actionCode = actionCode;
+    CppSpecialButton(@Nonnull String action) {
+        this.action = action;
     }
 
     @Nullable
-    public static CppSpecialButton getByActionCode(@Nonnull String actionCode) {
-        initButtonsByActionCodesMap();
-        return buttonsByActionCodes.get(actionCode);
+    public static CppSpecialButton getByAction(@Nonnull String action) {
+        initButtonsByActionsMap();
+        return buttonsByActions.get(action);
     }
 
-    private static void initButtonsByActionCodesMap() {
-        if (buttonsByActionCodes.isEmpty()) {
-            // if not initialized
-
-            final CppSpecialButton[] specialButtons = values();
-
-            final Map<String, CppSpecialButton> localButtonsByActionCodes = new HashMap<String, CppSpecialButton>(specialButtons.length);
-            for (CppSpecialButton specialButton : specialButtons) {
-                localButtonsByActionCodes.put(specialButton.getActionCode(), specialButton);
-            }
-
-            buttonsByActionCodes = localButtonsByActionCodes;
+    private static void initButtonsByActionsMap() {
+        Check.isMainThread();
+        if (!buttonsByActions.isEmpty()) {
+            return;
+        }
+        for (CppSpecialButton specialButton : values()) {
+            buttonsByActions.put(specialButton.action, specialButton);
         }
     }
 
     @Nonnull
-    public String getActionCode() {
-        return actionCode;
+    public String getAction() {
+        return action;
     }
 
     public abstract void onClick(@Nonnull Keyboard keyboard);