Remove LatinImeLogger and UsabilityStudyLogUtils

This CL must be checked in together with Ie52007dc5c.

Bug: 15318007
Change-Id: Ie665f296e43b5485ae8ba7e949aa262794ee0dcc

13 files changed, 17 insertions, 761 deletions

diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
index 61d51d1c9..ef5fabb41 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -33,7 +33,6 @@ import com.android.inputmethod.keyboard.internal.KeyboardState;
 import com.android.inputmethod.keyboard.internal.KeyboardTextsSet;
 import com.android.inputmethod.latin.InputView;
 import com.android.inputmethod.latin.LatinIME;
-import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.RichInputMethodManager;
 import com.android.inputmethod.latin.SubtypeSwitcher;
@@ -127,7 +126,6 @@ public final class KeyboardSwitcher implements KeyboardState.SwitchActions {
             mKeyboardTextsSet.setLocale(mSubtypeSwitcher.getCurrentSubtypeLocale(), mThemeContext);
         } catch (KeyboardLayoutSetException e) {
             Log.w(TAG, "loading keyboard failed: " + e.mKeyboardId, e.getCause());
-            LatinImeLogger.logOnException(e.mKeyboardId.toString(), e.getCause());
             return;
         }
     }
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java b/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java
index 1f14aa2e3..60d9a054d 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardTheme.java
@@ -81,20 +81,6 @@ public final class KeyboardTheme {
         return mThemeId;
     }
 
-    // TODO: This method should be removed when {@link LatinImeLogger} is removed.
-    public int getCompatibleThemeIdForLogging() {
-        switch (mThemeId) {
-        case THEME_ID_ICS:
-            return 5;
-        case THEME_ID_KLP:
-            return 9;
-        case THEME_ID_LXX_DARK:
-            return 10;
-        default: // Invalid theme
-            return -1;
-        }
-    }
-
     private static KeyboardTheme searchKeyboardThemeById(final int themeId) {
         // TODO: This search algorithm isn't optimal if there are many themes.
         for (final KeyboardTheme theme : KEYBOARD_THEMES) {
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardView.java b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
index ca7da6eb8..c4ca1c495 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
@@ -35,7 +35,6 @@ import android.view.View;
 import com.android.inputmethod.keyboard.internal.KeyDrawParams;
 import com.android.inputmethod.keyboard.internal.KeyVisualAttributes;
 import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.utils.TypefaceUtils;
 
@@ -185,7 +184,6 @@ public class KeyboardView extends View {
      */
     public void setKeyboard(final Keyboard keyboard) {
         mKeyboard = keyboard;
-        LatinImeLogger.onSetKeyboard(keyboard);
         final int keyHeight = keyboard.mMostCommonKeyHeight - keyboard.mVerticalGap;
         mKeyDrawParams.updateParams(keyHeight, mKeyVisualAttributes);
         mKeyDrawParams.updateParams(keyHeight, keyboard.mKeyVisualAttributes);
@@ -353,9 +351,6 @@ public class KeyboardView extends View {
         }
         canvas.translate(bgX, bgY);
         background.draw(canvas);
-        if (LatinImeLogger.sVISUALDEBUG) {
-            drawRectangle(canvas, 0.0f, 0.0f, bgWidth, bgHeight, 0x80c00000, new Paint());
-        }
         canvas.translate(-bgX, -bgY);
     }
 
@@ -367,10 +362,6 @@ public class KeyboardView extends View {
         final float centerX = keyWidth * 0.5f;
         final float centerY = keyHeight * 0.5f;
 
-        if (LatinImeLogger.sVISUALDEBUG) {
-            drawRectangle(canvas, 0.0f, 0.0f, keyWidth, keyHeight, 0x800000c0, new Paint());
-        }
-
         // Draw key label.
         final Drawable icon = key.getIcon(mKeyboard.mIconsSet, params.mAnimAlpha);
         float positionX = centerX;
@@ -452,12 +443,6 @@ public class KeyboardView extends View {
                     drawIcon(canvas, icon, iconX, iconY, iconWidth, iconHeight);
                 }
             }
-
-            if (LatinImeLogger.sVISUALDEBUG) {
-                final Paint line = new Paint();
-                drawHorizontalLine(canvas, baseline, keyWidth, 0xc0008000, line);
-                drawVerticalLine(canvas, positionX, keyHeight, 0xc0800080, line);
-            }
         }
 
         // Draw hint label.
@@ -497,12 +482,6 @@ public class KeyboardView extends View {
                 paint.setTextAlign(Align.CENTER);
             }
             canvas.drawText(hintLabel, 0, hintLabel.length(), hintX, hintY + adjustmentY, paint);
-
-            if (LatinImeLogger.sVISUALDEBUG) {
-                final Paint line = new Paint();
-                drawHorizontalLine(canvas, (int)hintY, keyWidth, 0xc0808000, line);
-                drawVerticalLine(canvas, (int)hintX, keyHeight, 0xc0808000, line);
-            }
         }
 
         // Draw key icon.
@@ -514,26 +493,17 @@ public class KeyboardView extends View {
                 iconWidth = Math.min(icon.getIntrinsicWidth(), keyWidth);
             }
             final int iconHeight = icon.getIntrinsicHeight();
-            final int iconX, alignX;
             final int iconY = key.isAlignButtom() ? keyHeight - iconHeight
                     : (keyHeight - iconHeight) / 2;
+            final int iconX;
             if (key.isAlignLeft()) {
                 iconX = mKeyLabelHorizontalPadding;
-                alignX = iconX;
             } else if (key.isAlignRight()) {
                 iconX = keyWidth - mKeyLabelHorizontalPadding - iconWidth;
-                alignX = iconX + iconWidth;
             } else { // Align center
                 iconX = (keyWidth - iconWidth) / 2;
-                alignX = iconX + iconWidth / 2;
             }
             drawIcon(canvas, icon, iconX, iconY, iconWidth, iconHeight);
-
-            if (LatinImeLogger.sVISUALDEBUG) {
-                final Paint line = new Paint();
-                drawVerticalLine(canvas, alignX, keyHeight, 0xc0800080, line);
-                drawRectangle(canvas, iconX, iconY, iconWidth, iconHeight, 0x80c00000, line);
-            }
         }
 
         if (key.hasPopupHint() && key.getMoreKeys() != null) {
@@ -555,12 +525,6 @@ public class KeyboardView extends View {
                 - TypefaceUtils.getReferenceCharWidth(paint) / 2.0f;
         final float hintY = keyHeight - mKeyPopupHintLetterPadding;
         canvas.drawText(POPUP_HINT_CHAR, hintX, hintY, paint);
-
-        if (LatinImeLogger.sVISUALDEBUG) {
-            final Paint line = new Paint();
-            drawHorizontalLine(canvas, (int)hintY, keyWidth, 0xc0808000, line);
-            drawVerticalLine(canvas, (int)hintX, keyHeight, 0xc0808000, line);
-        }
     }
 
     protected static void drawIcon(final Canvas canvas, final Drawable icon, final int x,
@@ -571,32 +535,6 @@ public class KeyboardView extends View {
         canvas.translate(-x, -y);
     }
 
-    private static void drawHorizontalLine(final Canvas canvas, final float y, final float w,
-            final int color, final Paint paint) {
-        paint.setStyle(Paint.Style.STROKE);
-        paint.setStrokeWidth(1.0f);
-        paint.setColor(color);
-        canvas.drawLine(0.0f, y, w, y, paint);
-    }
-
-    private static void drawVerticalLine(final Canvas canvas, final float x, final float h,
-            final int color, final Paint paint) {
-        paint.setStyle(Paint.Style.STROKE);
-        paint.setStrokeWidth(1.0f);
-        paint.setColor(color);
-        canvas.drawLine(x, 0.0f, x, h, paint);
-    }
-
-    private static void drawRectangle(final Canvas canvas, final float x, final float y,
-            final float w, final float h, final int color, final Paint paint) {
-        paint.setStyle(Paint.Style.STROKE);
-        paint.setStrokeWidth(1.0f);
-        paint.setColor(color);
-        canvas.translate(x, y);
-        canvas.drawRect(0.0f, 0.0f, w, h, paint);
-        canvas.translate(-x, -y);
-    }
-
     public Paint newLabelPaint(final Key key) {
         final Paint paint = new Paint();
         paint.setAntiAlias(true);
diff --git a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
index 4362a242f..95258ccdc 100644
--- a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
@@ -52,14 +52,12 @@ import com.android.inputmethod.keyboard.internal.NonDistinctMultitouchHelper;
 import com.android.inputmethod.keyboard.internal.SlidingKeyInputDrawingPreview;
 import com.android.inputmethod.keyboard.internal.TimerHandler;
 import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.SuggestedWords;
 import com.android.inputmethod.latin.settings.DebugSettings;
 import com.android.inputmethod.latin.utils.CoordinateUtils;
 import com.android.inputmethod.latin.utils.SpacebarLanguageUtils;
 import com.android.inputmethod.latin.utils.TypefaceUtils;
-import com.android.inputmethod.latin.utils.UsabilityStudyLogUtils;
 
 import java.util.WeakHashMap;
 
@@ -699,10 +697,6 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
     }
 
     public boolean processMotionEvent(final MotionEvent me) {
-        if (LatinImeLogger.sUsabilityStudy) {
-            UsabilityStudyLogUtils.writeMotionEvent(me);
-        }
-
         final int index = me.getActionIndex();
         final int id = me.getPointerId(index);
         final PointerTracker tracker = PointerTracker.getPointerTracker(id);
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index a3254161d..d329d2ce6 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -626,8 +626,6 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         unregisterReceiver(mDictionaryPackInstallReceiver);
         unregisterReceiver(mDictionaryDumpBroadcastReceiver);
         PersonalizationDictionarySessionRegistrar.close(this);
-        LatinImeLogger.commit();
-        LatinImeLogger.onDestroy();
         StatsUtils.onDestroy();
         super.onDestroy();
     }
@@ -671,9 +669,6 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         if (hasSuggestionStripView()) {
             mSuggestionStripView.setListener(this, view);
         }
-        if (LatinImeLogger.sVISUALDEBUG) {
-            mKeyPreviewBackingView.setBackgroundColor(0x10FF0000);
-        }
     }
 
     @Override
@@ -755,7 +750,6 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
             Log.w(TAG, "Use EditorInfo.IME_FLAG_FORCE_ASCII flag instead");
         }
 
-        LatinImeLogger.onStartInputView(editorInfo);
         // In landscape mode, this method gets called without the input view being created.
         if (mainKeyboardView == null) {
             return;
@@ -876,7 +870,6 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
     private void onFinishInputInternal() {
         super.onFinishInput();
 
-        LatinImeLogger.commit();
         final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
         if (mainKeyboardView != null) {
             mainKeyboardView.closing();
@@ -963,7 +956,6 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
 
     @Override
     public void hideWindow() {
-        LatinImeLogger.commit();
         mKeyboardSwitcher.onHideWindow();
 
         if (TRACE) Debug.stopMethodTracing();
diff --git a/java/src/com/android/inputmethod/latin/LatinImeLogger.java b/java/src/com/android/inputmethod/latin/LatinImeLogger.java
index 3f2b0a3f4..8fd36b937 100644
--- a/java/src/com/android/inputmethod/latin/LatinImeLogger.java
+++ b/java/src/com/android/inputmethod/latin/LatinImeLogger.java
@@ -16,76 +16,12 @@
 
 package com.android.inputmethod.latin;
 
-import android.content.SharedPreferences;
-import android.view.inputmethod.EditorInfo;
+import android.content.Context;
 
-import com.android.inputmethod.keyboard.Keyboard;
+// TODO: Rename this class name to make it more relevant.
+public final class LatinImeLogger {
+    public static final boolean sDBG = false;
 
-public final class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChangeListener {
-
-    public static boolean sDBG = false;
-    public static boolean sVISUALDEBUG = false;
-    public static boolean sUsabilityStudy = false;
-
-    @Override
-    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
-    }
-
-    public static void init(LatinIME context) {
-    }
-
-    public static void commit() {
-    }
-
-    public static boolean getUsabilityStudyMode(final SharedPreferences prefs) {
-        return false;
-    }
-
-    public static void onDestroy() {
-    }
-
-    public static void logOnManualSuggestion(
-            String before, String after, int position, SuggestedWords suggestedWords) {
-    }
-
-    public static void logOnAutoCorrectionForTyping(
-            String before, String after, int separatorCode) {
-    }
-
-    public static void logOnAutoCorrectionForGeometric(String before, String after,
-            int separatorCode, InputPointers inputPointers) {
-    }
-
-    public static void logOnAutoCorrectionCancelled() {
-    }
-
-    public static void logOnDelete(int x, int y) {
-    }
-
-    public static void logOnInputChar() {
-    }
-
-    public static void logOnInputSeparator() {
-    }
-
-    public static void logOnException(String metaData, Throwable e) {
-    }
-
-    public static void logOnWarning(String warning) {
-    }
-
-    public static void onStartInputView(EditorInfo editorInfo) {
-    }
-
-    public static void onStartSuggestion(CharSequence previousWords) {
-    }
-
-    public static void onAddSuggestedWord(String word, String sourceDictionaryId) {
-    }
-
-    public static void onSetKeyboard(Keyboard kb) {
-    }
-
-    public static void onPrintAllUsabilityStudyLogs() {
+    public static void init(Context context) {
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index 9ec697b5e..9da0f8451 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -18,7 +18,6 @@ package com.android.inputmethod.latin;
 
 import android.text.TextUtils;
 
-import com.android.inputmethod.event.Event;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.define.ProductionFlag;
@@ -77,7 +76,6 @@ public final class Suggest {
             final boolean blockOffensiveWords, final boolean isCorrectionEnabled,
             final int[] additionalFeaturesOptions, final int sessionId, final int sequenceNumber,
             final OnGetSuggestedWordsCallback callback) {
-        LatinImeLogger.onStartSuggestion(prevWordsInfo.mPrevWord);
         if (wordComposer.isBatchMode()) {
             getSuggestedWordsForBatchInput(wordComposer, prevWordsInfo, proximityInfo,
                     blockOffensiveWords, additionalFeaturesOptions, sessionId, sequenceNumber,
@@ -101,7 +99,6 @@ public final class Suggest {
         final String consideredWord = trailingSingleQuotesCount > 0
                 ? typedWord.substring(0, typedWord.length() - trailingSingleQuotesCount)
                 : typedWord;
-        LatinImeLogger.onAddSuggestedWord(typedWord, Dictionary.TYPE_USER_TYPED);
 
         final ArrayList<SuggestedWordInfo> rawSuggestions;
         if (ProductionFlag.INCLUDE_RAW_SUGGESTIONS) {
@@ -186,12 +183,6 @@ public final class Suggest {
             }
         }
 
-        for (int i = 0; i < suggestionsCount; ++i) {
-            final SuggestedWordInfo wordInfo = suggestionsContainer.get(i);
-            LatinImeLogger.onAddSuggestedWord(wordInfo.mWord.toString(),
-                    wordInfo.mSourceDict.mDictType);
-        }
-
         if (!TextUtils.isEmpty(typedWord)) {
             suggestionsContainer.add(0, new SuggestedWordInfo(typedWord,
                     SuggestedWordInfo.MAX_SCORE, SuggestedWordInfo.KIND_TYPED,
@@ -233,10 +224,6 @@ public final class Suggest {
         final SuggestionResults suggestionResults = mDictionaryFacilitator.getSuggestionResults(
                 wordComposer, prevWordsInfo, proximityInfo, blockOffensiveWords,
                 additionalFeaturesOptions, sessionId, rawSuggestions);
-        for (SuggestedWordInfo wordInfo : suggestionResults) {
-            LatinImeLogger.onAddSuggestedWord(wordInfo.mWord, wordInfo.mSourceDict.mDictType);
-        }
-
         final ArrayList<SuggestedWordInfo> suggestionsContainer =
                 new ArrayList<>(suggestionResults);
         final int suggestionsCount = suggestionsContainer.size();
diff --git a/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
index 2530f64f9..dc2e1af22 100644
--- a/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
+++ b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
@@ -49,7 +49,6 @@ import com.android.inputmethod.latin.settings.SpacingAndPunctuations;
 import com.android.inputmethod.latin.suggestions.SuggestionStripViewAccessor;
 import com.android.inputmethod.latin.utils.AsyncResultHolder;
 import com.android.inputmethod.latin.utils.InputTypeUtils;
-import com.android.inputmethod.latin.utils.LatinImeLoggerUtils;
 import com.android.inputmethod.latin.utils.RecapitalizeStatus;
 import com.android.inputmethod.latin.utils.StringUtils;
 import com.android.inputmethod.latin.utils.TextRange;
@@ -230,8 +229,6 @@ public final class InputLogic {
         // If this is a punctuation picked from the suggestion strip, pass it to onCodeInput
         if (suggestion.length() == 1 && suggestedWords.isPunctuationSuggestions()) {
             // Word separators are suggested before the user inputs something.
-            // So, LatinImeLogger logs "" as a user's input.
-            LatinImeLogger.logOnManualSuggestion("", suggestion, index, suggestedWords);
             // Rely on onCodeInput to do the complicated swapping/stripping logic consistently.
             final Event event = Event.createPunctuationSuggestionPickedEvent(suggestionInfo);
             return onCodeInput(settingsValues, event, keyboardShiftState, handler);
@@ -269,7 +266,6 @@ public final class InputLogic {
         // We need to log before we commit, because the word composer will store away the user
         // typed word.
         final String replacedWord = mWordComposer.getTypedWord();
-        LatinImeLogger.logOnManualSuggestion(replacedWord, suggestion, index, suggestedWords);
         commitChosenWord(settingsValues, suggestion,
                 LastComposedWord.COMMIT_TYPE_MANUAL_PICK, LastComposedWord.NOT_A_SEPARATOR);
         mConnection.endBatchEdit();
@@ -286,10 +282,6 @@ public final class InputLogic {
                         || suggestionInfo.isKindOf(SuggestedWordInfo.KIND_OOV_CORRECTION))
                         && !mDictionaryFacilitator.isValidWord(suggestion, true /* ignoreCase */);
 
-        if (settingsValues.mIsInternal) {
-            LatinImeLoggerUtils.onSeparator((char)Constants.CODE_SPACE,
-                    Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
-        }
         if (showingAddToDictionaryHint && mDictionaryFacilitator.isUserDictionaryEnabled()) {
             mSuggestionStripViewAccessor.showAddToDictionaryHint(suggestion);
         } else {
@@ -405,7 +397,6 @@ public final class InputLogic {
             switch (event.mKeyCode) {
             case Constants.CODE_DELETE:
                 handleBackspace(inputTransaction);
-                LatinImeLogger.logOnDelete(event.mX, event.mY);
                 break;
             case Constants.CODE_SHIFT:
                 performRecapitalization(inputTransaction.mSettingsValues);
@@ -511,12 +502,6 @@ public final class InputLogic {
         ++mAutoCommitSequenceNumber;
         mConnection.beginBatchEdit();
         if (mWordComposer.isComposingWord()) {
-            if (settingsValues.mIsInternal) {
-                if (mWordComposer.isBatchMode()) {
-                    LatinImeLoggerUtils.onAutoCorrection("", mWordComposer.getTypedWord(), " ",
-                            mWordComposer);
-                }
-            }
             if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
                 // If we are in the middle of a recorrection, we need to commit the recorrection
                 // first so that we can insert the batch input at the current cursor position.
@@ -656,19 +641,9 @@ public final class InputLogic {
                 || Character.getType(codePoint) == Character.OTHER_SYMBOL) {
             didAutoCorrect = handleSeparator(inputTransaction,
                     inputTransaction.mEvent.isSuggestionStripPress(), handler);
-            if (inputTransaction.mSettingsValues.mIsInternal) {
-                LatinImeLoggerUtils.onSeparator((char)codePoint,
-                        inputTransaction.mEvent.mX, inputTransaction.mEvent.mY);
-            }
         } else {
             didAutoCorrect = false;
             if (SpaceState.PHANTOM == inputTransaction.mSpaceState) {
-                if (inputTransaction.mSettingsValues.mIsInternal) {
-                    if (mWordComposer.isComposingWord() && mWordComposer.isBatchMode()) {
-                        LatinImeLoggerUtils.onAutoCorrection("", mWordComposer.getTypedWord(), " ",
-                                mWordComposer);
-                    }
-                }
                 if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
                     // If we are in the middle of a recorrection, we need to commit the recorrection
                     // first so that we can insert the character at the current cursor position.
@@ -767,10 +742,6 @@ public final class InputLogic {
             mSuggestionStripViewAccessor.dismissAddToDictionaryHint();
         }
         inputTransaction.setRequiresUpdateSuggestions();
-        if (settingsValues.mIsInternal) {
-            LatinImeLoggerUtils.onNonSeparator((char)codePoint, inputTransaction.mEvent.mX,
-                    inputTransaction.mEvent.mY);
-        }
     }
 
     /**
@@ -921,9 +892,6 @@ public final class InputLogic {
             inputTransaction.setRequiresUpdateSuggestions();
         } else {
             if (mLastComposedWord.canRevertCommit()) {
-                if (inputTransaction.mSettingsValues.mIsInternal) {
-                    LatinImeLoggerUtils.onAutoCorrectionCancellation();
-                }
                 revertCommit(inputTransaction);
                 return;
             }
@@ -1464,10 +1432,6 @@ public final class InputLogic {
                     mLatinIME.getCoordinatesForCurrentKeyboard(codePoints), prevWordsInfo);
             mConnection.setComposingText(textToCommit, 1);
         }
-        if (inputTransaction.mSettingsValues.mIsInternal) {
-            LatinImeLoggerUtils.onSeparator(mLastComposedWord.mSeparatorString,
-                    Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
-        }
         // Don't restart suggestion yet. We'll restart if the user deletes the separator.
         mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
         // We have a separator between the word and the cursor: we should show predictions.
@@ -1869,10 +1833,6 @@ public final class InputLogic {
                 throw new RuntimeException("We have an auto-correction but the typed word "
                         + "is empty? Impossible! I must commit suicide.");
             }
-            if (settingsValues.mIsInternal) {
-                LatinImeLoggerUtils.onAutoCorrection(
-                        typedWord, autoCorrection, separator, mWordComposer);
-            }
             commitChosenWord(settingsValues, autoCorrection,
                     LastComposedWord.COMMIT_TYPE_DECIDED_WORD, separator);
             if (!typedWord.equals(autoCorrection)) {
diff --git a/java/src/com/android/inputmethod/latin/settings/DebugSettings.java b/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
index 5fa15f418..9e7e07e11 100644
--- a/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
+++ b/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
@@ -29,7 +29,6 @@ import android.preference.PreferenceScreen;
 
 import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.DictionaryDumpBroadcastReceiver;
-import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.debug.ExternalDictionaryGetterForDebug;
 import com.android.inputmethod.latin.utils.ApplicationUtils;
@@ -40,8 +39,6 @@ public final class DebugSettings extends PreferenceFragment
 
     public static final String PREF_DEBUG_MODE = "debug_mode";
     public static final String PREF_FORCE_NON_DISTINCT_MULTITOUCH = "force_non_distinct_multitouch";
-    public static final String PREF_USABILITY_STUDY_MODE = "usability_study_mode";
-    public static final String PREF_STATISTICS_LOGGING = "enable_logging";
     public static final String PREF_KEY_PREVIEW_SHOW_UP_START_SCALE =
             "pref_key_preview_show_up_start_scale";
     public static final String PREF_KEY_PREVIEW_DISMISS_END_SCALE =
@@ -58,11 +55,8 @@ public final class DebugSettings extends PreferenceFragment
     public static final String PREF_SLIDING_KEY_INPUT_PREVIEW = "pref_sliding_key_input_preview";
     public static final String PREF_KEY_LONGPRESS_TIMEOUT = "pref_key_longpress_timeout";
 
-    private static final boolean SHOW_STATISTICS_LOGGING = false;
-
     private boolean mServiceNeedsRestart = false;
     private CheckBoxPreference mDebugMode;
-    private CheckBoxPreference mStatisticsLoggingPref;
 
     @Override
     public void onCreate(Bundle icicle) {
@@ -71,20 +65,6 @@ public final class DebugSettings extends PreferenceFragment
         SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
         prefs.registerOnSharedPreferenceChangeListener(this);
 
-        final Preference usabilityStudyPref = findPreference(PREF_USABILITY_STUDY_MODE);
-        if (usabilityStudyPref instanceof CheckBoxPreference) {
-            final CheckBoxPreference checkbox = (CheckBoxPreference)usabilityStudyPref;
-            checkbox.setChecked(prefs.getBoolean(PREF_USABILITY_STUDY_MODE,
-                    LatinImeLogger.getUsabilityStudyMode(prefs)));
-        }
-        final Preference statisticsLoggingPref = findPreference(PREF_STATISTICS_LOGGING);
-        if (statisticsLoggingPref instanceof CheckBoxPreference) {
-            mStatisticsLoggingPref = (CheckBoxPreference) statisticsLoggingPref;
-            if (!SHOW_STATISTICS_LOGGING) {
-                getPreferenceScreen().removePreference(statisticsLoggingPref);
-            }
-        }
-
         final PreferenceScreen readExternalDictionary =
                 (PreferenceScreen) findPreference(PREF_READ_EXTERNAL_DICTIONARY);
         if (null != readExternalDictionary) {
@@ -162,27 +142,22 @@ public final class DebugSettings extends PreferenceFragment
     @Override
     public void onStop() {
         super.onStop();
-        if (mServiceNeedsRestart) Process.killProcess(Process.myPid());
+        if (mServiceNeedsRestart) {
+            Process.killProcess(Process.myPid());
+        }
     }
 
     @Override
     public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
-        if (key.equals(PREF_DEBUG_MODE)) {
-            if (mDebugMode != null) {
-                mDebugMode.setChecked(prefs.getBoolean(PREF_DEBUG_MODE, false));
-                final boolean checked = mDebugMode.isChecked();
-                if (mStatisticsLoggingPref != null) {
-                    if (checked) {
-                        getPreferenceScreen().addPreference(mStatisticsLoggingPref);
-                    } else {
-                        getPreferenceScreen().removePreference(mStatisticsLoggingPref);
-                    }
-                }
-                updateDebugMode();
-                mServiceNeedsRestart = true;
-            }
-        } else if (key.equals(PREF_FORCE_NON_DISTINCT_MULTITOUCH)) {
+        if (key.equals(PREF_DEBUG_MODE) && mDebugMode != null) {
+            mDebugMode.setChecked(prefs.getBoolean(PREF_DEBUG_MODE, false));
+            updateDebugMode();
+            mServiceNeedsRestart = true;
+            return;
+        }
+        if (key.equals(PREF_FORCE_NON_DISTINCT_MULTITOUCH)) {
             mServiceNeedsRestart = true;
+            return;
         }
     }
 
diff --git a/java/src/com/android/inputmethod/latin/settings/Settings.java b/java/src/com/android/inputmethod/latin/settings/Settings.java
index 48219f60a..235847799 100644
--- a/java/src/com/android/inputmethod/latin/settings/Settings.java
+++ b/java/src/com/android/inputmethod/latin/settings/Settings.java
@@ -332,10 +332,6 @@ public final class Settings implements SharedPreferences.OnSharedPreferenceChang
                 R.array.keypress_vibration_durations, DEFAULT_KEYPRESS_VIBRATION_DURATION));
     }
 
-    public static boolean readUsabilityStudyMode(final SharedPreferences prefs) {
-        return prefs.getBoolean(DebugSettings.PREF_USABILITY_STUDY_MODE, true);
-    }
-
     public static float readKeyPreviewAnimationScale(final SharedPreferences prefs,
             final String prefKey, final float defaultValue) {
         final float fraction = prefs.getFloat(prefKey, UNDEFINED_PREFERENCE_VALUE_FLOAT);
diff --git a/java/src/com/android/inputmethod/latin/utils/LatinImeLoggerUtils.java b/java/src/com/android/inputmethod/latin/utils/LatinImeLoggerUtils.java
deleted file mode 100644
index d14ba508b..000000000
--- a/java/src/com/android/inputmethod/latin/utils/LatinImeLoggerUtils.java
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * 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.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import android.text.TextUtils;
-
-import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.LatinImeLogger;
-import com.android.inputmethod.latin.WordComposer;
-
-public final class LatinImeLoggerUtils {
-    private LatinImeLoggerUtils() {
-        // This utility class is not publicly instantiable.
-    }
-
-    public static void onNonSeparator(final char code, final int x, final int y) {
-        UserLogRingCharBuffer.getInstance().push(code, x, y);
-        LatinImeLogger.logOnInputChar();
-    }
-
-    public static void onSeparator(final int code, final int x, final int y) {
-        // Helper method to log a single code point separator
-        // TODO: cache this mapping of a code point to a string in a sparse array in StringUtils
-        onSeparator(StringUtils.newSingleCodePointString(code), x, y);
-    }
-
-    public static void onSeparator(final String separator, final int x, final int y) {
-        final int length = separator.length();
-        for (int i = 0; i < length; i = Character.offsetByCodePoints(separator, i, 1)) {
-            int codePoint = Character.codePointAt(separator, i);
-            // TODO: accept code points
-            UserLogRingCharBuffer.getInstance().push((char)codePoint, x, y);
-        }
-        LatinImeLogger.logOnInputSeparator();
-    }
-
-    public static void onAutoCorrection(final String typedWord, final String correctedWord,
-            final String separatorString, final WordComposer wordComposer) {
-        final boolean isBatchMode = wordComposer.isBatchMode();
-        if (!isBatchMode && TextUtils.isEmpty(typedWord)) {
-            return;
-        }
-        // TODO: this fails when the separator is more than 1 code point long, but
-        // the backend can't handle it yet. The only case when this happens is with
-        // smileys and other multi-character keys.
-        final int codePoint = TextUtils.isEmpty(separatorString) ? Constants.NOT_A_CODE
-                : separatorString.codePointAt(0);
-        if (!isBatchMode) {
-            LatinImeLogger.logOnAutoCorrectionForTyping(typedWord, correctedWord, codePoint);
-        } else {
-            if (!TextUtils.isEmpty(correctedWord)) {
-                // We must make sure that InputPointer contains only the relative timestamps,
-                // not actual timestamps.
-                LatinImeLogger.logOnAutoCorrectionForGeometric(
-                        "", correctedWord, codePoint, wordComposer.getInputPointers());
-            }
-        }
-    }
-
-    public static void onAutoCorrectionCancellation() {
-        LatinImeLogger.logOnAutoCorrectionCancelled();
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/utils/UsabilityStudyLogUtils.java b/java/src/com/android/inputmethod/latin/utils/UsabilityStudyLogUtils.java
deleted file mode 100644
index fac932dba..000000000
--- a/java/src/com/android/inputmethod/latin/utils/UsabilityStudyLogUtils.java
+++ /dev/null
@@ -1,292 +0,0 @@
-/*
- * Copyright (C) 2016 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.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import android.content.Intent;
-import android.content.pm.PackageManager;
-import android.inputmethodservice.InputMethodService;
-import android.net.Uri;
-import android.os.Environment;
-import android.os.Handler;
-import android.os.HandlerThread;
-import android.os.Process;
-import android.util.Log;
-import android.view.MotionEvent;
-
-import com.android.inputmethod.latin.LatinImeLogger;
-
-import java.io.BufferedReader;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.FileReader;
-import java.io.IOException;
-import java.io.PrintWriter;
-import java.nio.channels.FileChannel;
-import java.text.SimpleDateFormat;
-import java.util.Date;
-import java.util.Locale;
-
-public final class UsabilityStudyLogUtils {
-    private static final String USABILITY_TAG = UsabilityStudyLogUtils.class.getSimpleName();
-    private static final String FILENAME = "log.txt";
-    private final Handler mLoggingHandler;
-    private File mFile;
-    private File mDirectory;
-    private InputMethodService mIms;
-    private PrintWriter mWriter;
-    private final Date mDate;
-    private final SimpleDateFormat mDateFormat;
-
-    private UsabilityStudyLogUtils() {
-        mDate = new Date();
-        mDateFormat = new SimpleDateFormat("yyyyMMdd-HHmmss.SSSZ", Locale.US);
-
-        HandlerThread handlerThread = new HandlerThread("UsabilityStudyLogUtils logging task",
-                Process.THREAD_PRIORITY_BACKGROUND);
-        handlerThread.start();
-        mLoggingHandler = new Handler(handlerThread.getLooper());
-    }
-
-    // Initialization-on-demand holder
-    private static final class OnDemandInitializationHolder {
-        public static final UsabilityStudyLogUtils sInstance = new UsabilityStudyLogUtils();
-    }
-
-    public static UsabilityStudyLogUtils getInstance() {
-        return OnDemandInitializationHolder.sInstance;
-    }
-
-    public void init(final InputMethodService ims) {
-        mIms = ims;
-        mDirectory = ims.getFilesDir();
-    }
-
-    private void createLogFileIfNotExist() {
-        if ((mFile == null || !mFile.exists())
-                && (mDirectory != null && mDirectory.exists())) {
-            try {
-                mWriter = getPrintWriter(mDirectory, FILENAME, false);
-            } catch (final IOException e) {
-                Log.e(USABILITY_TAG, "Can't create log file.");
-            }
-        }
-    }
-
-    public static void writeBackSpace(final int x, final int y) {
-        UsabilityStudyLogUtils.getInstance().write("<backspace>\t" + x + "\t" + y);
-    }
-
-    public static void writeChar(final char c, final int x, final int y) {
-        String inputChar = String.valueOf(c);
-        switch (c) {
-            case '\n':
-                inputChar = "<enter>";
-                break;
-            case '\t':
-                inputChar = "<tab>";
-                break;
-            case ' ':
-                inputChar = "<space>";
-                break;
-        }
-        UsabilityStudyLogUtils.getInstance().write(inputChar + "\t" + x + "\t" + y);
-        LatinImeLogger.onPrintAllUsabilityStudyLogs();
-    }
-
-    public static void writeMotionEvent(final MotionEvent me) {
-        final int action = me.getActionMasked();
-        final long eventTime = me.getEventTime();
-        final int pointerCount = me.getPointerCount();
-        for (int index = 0; index < pointerCount; index++) {
-            final int id = me.getPointerId(index);
-            final int x = (int)me.getX(index);
-            final int y = (int)me.getY(index);
-            final float size = me.getSize(index);
-            final float pressure = me.getPressure(index);
-
-            final String eventTag;
-            switch (action) {
-            case MotionEvent.ACTION_UP:
-                eventTag = "[Up]";
-                break;
-            case MotionEvent.ACTION_DOWN:
-                eventTag = "[Down]";
-                break;
-            case MotionEvent.ACTION_POINTER_UP:
-                eventTag = "[PointerUp]";
-                break;
-            case MotionEvent.ACTION_POINTER_DOWN:
-                eventTag = "[PointerDown]";
-                break;
-            case MotionEvent.ACTION_MOVE:
-                eventTag = "[Move]";
-                break;
-            default:
-                eventTag = "[Action" + action + "]";
-                break;
-            }
-            getInstance().write(eventTag + eventTime + "," + id + "," + x + "," + y + "," + size
-                    + "," + pressure);
-        }
-    }
-
-    public void write(final String log) {
-        mLoggingHandler.post(new Runnable() {
-            @Override
-            public void run() {
-                createLogFileIfNotExist();
-                final long currentTime = System.currentTimeMillis();
-                mDate.setTime(currentTime);
-
-                final String printString = String.format(Locale.US, "%s\t%d\t%s\n",
-                        mDateFormat.format(mDate), currentTime, log);
-                if (LatinImeLogger.sDBG) {
-                    Log.d(USABILITY_TAG, "Write: " + log);
-                }
-                mWriter.print(printString);
-            }
-        });
-    }
-
-    private synchronized String getBufferedLogs() {
-        mWriter.flush();
-        final StringBuilder sb = new StringBuilder();
-        final BufferedReader br = getBufferedReader();
-        String line;
-        try {
-            while ((line = br.readLine()) != null) {
-                sb.append('\n');
-                sb.append(line);
-            }
-        } catch (final IOException e) {
-            Log.e(USABILITY_TAG, "Can't read log file.");
-        } finally {
-            if (LatinImeLogger.sDBG) {
-                Log.d(USABILITY_TAG, "Got all buffered logs\n" + sb.toString());
-            }
-            try {
-                br.close();
-            } catch (final IOException e) {
-                // ignore.
-            }
-        }
-        return sb.toString();
-    }
-
-    public void emailUsabilityStudyLogsAll() {
-        mLoggingHandler.post(new Runnable() {
-            @Override
-            public void run() {
-                final Date date = new Date();
-                date.setTime(System.currentTimeMillis());
-                final String currentDateTimeString =
-                        new SimpleDateFormat("yyyyMMdd-HHmmssZ", Locale.US).format(date);
-                if (mFile == null) {
-                    Log.w(USABILITY_TAG, "No internal log file found.");
-                    return;
-                }
-                if (mIms.checkCallingOrSelfPermission(
-                            android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
-                                    != PackageManager.PERMISSION_GRANTED) {
-                    Log.w(USABILITY_TAG, "Doesn't have the permission WRITE_EXTERNAL_STORAGE");
-                    return;
-                }
-                mWriter.flush();
-                final String destPath = Environment.getExternalStorageDirectory()
-                        + "/usability-" + currentDateTimeString + ".log";
-                final File destFile = new File(destPath);
-                try {
-                    final FileInputStream srcStream = new FileInputStream(mFile);
-                    final FileOutputStream destStream = new FileOutputStream(destFile);
-                    final FileChannel src = srcStream.getChannel();
-                    final FileChannel dest = destStream.getChannel();
-                    src.transferTo(0, src.size(), dest);
-                    src.close();
-                    srcStream.close();
-                    dest.close();
-                    destStream.close();
-                } catch (final FileNotFoundException e1) {
-                    Log.w(USABILITY_TAG, e1);
-                    return;
-                } catch (final IOException e2) {
-                    Log.w(USABILITY_TAG, e2);
-                    return;
-                }
-                if (!destFile.exists()) {
-                    Log.w(USABILITY_TAG, "Dest file doesn't exist.");
-                    return;
-                }
-                final Intent intent = new Intent(Intent.ACTION_SEND);
-                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-                if (LatinImeLogger.sDBG) {
-                    Log.d(USABILITY_TAG, "Destination file URI is " + destFile.toURI());
-                }
-                intent.setType("text/plain");
-                intent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://" + destPath));
-                intent.putExtra(Intent.EXTRA_SUBJECT,
-                        "[Usability Study Logs] " + currentDateTimeString);
-                mIms.startActivity(intent);
-            }
-        });
-    }
-
-    public void printAll() {
-        mLoggingHandler.post(new Runnable() {
-            @Override
-            public void run() {
-                mIms.getCurrentInputConnection().commitText(getBufferedLogs(), 0);
-            }
-        });
-    }
-
-    public void clearAll() {
-        mLoggingHandler.post(new Runnable() {
-            @Override
-            public void run() {
-                if (mFile != null && mFile.exists()) {
-                    if (LatinImeLogger.sDBG) {
-                        Log.d(USABILITY_TAG, "Delete log file.");
-                    }
-                    mFile.delete();
-                    mWriter.close();
-                }
-            }
-        });
-    }
-
-    private BufferedReader getBufferedReader() {
-        createLogFileIfNotExist();
-        try {
-            return new BufferedReader(new FileReader(mFile));
-        } catch (final FileNotFoundException e) {
-            return null;
-        }
-    }
-
-    private PrintWriter getPrintWriter(final File dir, final String filename,
-            final boolean renew) throws IOException {
-        mFile = new File(dir, filename);
-        if (mFile.exists()) {
-            if (renew) {
-                mFile.delete();
-            }
-        }
-        return new PrintWriter(new FileOutputStream(mFile), true /* autoFlush */);
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/utils/UserLogRingCharBuffer.java b/java/src/com/android/inputmethod/latin/utils/UserLogRingCharBuffer.java
deleted file mode 100644
index cf0ce0d2f..000000000
--- a/java/src/com/android/inputmethod/latin/utils/UserLogRingCharBuffer.java
+++ /dev/null
@@ -1,137 +0,0 @@
-/*
- * 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.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import android.inputmethodservice.InputMethodService;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.LatinImeLogger;
-import com.android.inputmethod.latin.settings.Settings;
-
-public final class UserLogRingCharBuffer {
-    public /* for test */ static final int BUFSIZE = 20;
-    public /* for test */ int mLength = 0;
-
-    private static UserLogRingCharBuffer sUserLogRingCharBuffer = new UserLogRingCharBuffer();
-    private static final char PLACEHOLDER_DELIMITER_CHAR = '\uFFFC';
-    private static final int INVALID_COORDINATE = -2;
-    private boolean mEnabled = false;
-    private int mEnd = 0;
-    private char[] mCharBuf = new char[BUFSIZE];
-    private int[] mXBuf = new int[BUFSIZE];
-    private int[] mYBuf = new int[BUFSIZE];
-
-    private UserLogRingCharBuffer() {
-        // Intentional empty constructor for singleton.
-    }
-
-    @UsedForTesting
-    public static UserLogRingCharBuffer getInstance() {
-        return sUserLogRingCharBuffer;
-    }
-
-    public static UserLogRingCharBuffer init(final InputMethodService context,
-            final boolean enabled, final boolean usabilityStudy) {
-        if (!(enabled || usabilityStudy)) {
-            return null;
-        }
-        sUserLogRingCharBuffer.mEnabled = true;
-        UsabilityStudyLogUtils.getInstance().init(context);
-        return sUserLogRingCharBuffer;
-    }
-
-    private static int normalize(final int in) {
-        int ret = in % BUFSIZE;
-        return ret < 0 ? ret + BUFSIZE : ret;
-    }
-
-    // TODO: accept code points
-    @UsedForTesting
-    public void push(final char c, final int x, final int y) {
-        if (!mEnabled) {
-            return;
-        }
-        if (LatinImeLogger.sUsabilityStudy) {
-            UsabilityStudyLogUtils.writeChar(c, x, y);
-        }
-        mCharBuf[mEnd] = c;
-        mXBuf[mEnd] = x;
-        mYBuf[mEnd] = y;
-        mEnd = normalize(mEnd + 1);
-        if (mLength < BUFSIZE) {
-            ++mLength;
-        }
-    }
-
-    public char pop() {
-        if (mLength < 1) {
-            return PLACEHOLDER_DELIMITER_CHAR;
-        }
-        mEnd = normalize(mEnd - 1);
-        --mLength;
-        return mCharBuf[mEnd];
-    }
-
-    public char getBackwardNthChar(final int n) {
-        if (mLength <= n || n < 0) {
-            return PLACEHOLDER_DELIMITER_CHAR;
-        }
-        return mCharBuf[normalize(mEnd - n - 1)];
-    }
-
-    public int getPreviousX(final char c, final int back) {
-        final int index = normalize(mEnd - 2 - back);
-        if (mLength <= back
-                || Character.toLowerCase(c) != Character.toLowerCase(mCharBuf[index])) {
-            return INVALID_COORDINATE;
-        }
-        return mXBuf[index];
-    }
-
-    public int getPreviousY(final char c, final int back) {
-        int index = normalize(mEnd - 2 - back);
-        if (mLength <= back
-                || Character.toLowerCase(c) != Character.toLowerCase(mCharBuf[index])) {
-            return INVALID_COORDINATE;
-        }
-        return mYBuf[index];
-    }
-
-    public String getLastWord(final int ignoreCharCount) {
-        final StringBuilder sb = new StringBuilder();
-        int i = ignoreCharCount;
-        for (; i < mLength; ++i) {
-            final char c = mCharBuf[normalize(mEnd - 1 - i)];
-            if (!Settings.getInstance().isWordSeparator(c)) {
-                break;
-            }
-        }
-        for (; i < mLength; ++i) {
-            char c = mCharBuf[normalize(mEnd - 1 - i)];
-            if (!Settings.getInstance().isWordSeparator(c)) {
-                sb.append(c);
-            } else {
-                break;
-            }
-        }
-        return sb.reverse().toString();
-    }
-
-    public void reset() {
-        mLength = 0;
-    }
-}