Separate utility methods from BinaryDictionary.

Bug: 8187060
Change-Id: Ice2984e332b7bd3bb17174aefc80b5635b72fc50

14 files changed, 122 insertions, 80 deletions

diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 851ecc042..05e6ef0d2 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -40,7 +40,6 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Locale;
-import java.util.Map;
 
 /**
  * Implements a static, compacted, binary dictionary of standard words.
@@ -142,8 +141,6 @@ public final class BinaryDictionary extends Dictionary {
         JniUtils.loadNativeLibrary();
     }
 
-    private static native boolean createEmptyDictFileNative(String filePath, long dictVersion,
-            String locale, String[] attributeKeyStringArray, String[] attributeValueStringArray);
     private static native long openNative(String sourceDir, long dictOffset, long dictSize,
             boolean isUpdatable);
     private static native void getHeaderInfoNative(long dict, int[] outHeaderSize,
@@ -167,8 +164,6 @@ public final class BinaryDictionary extends Dictionary {
             int[] suggestOptions, int[] prevWordCodePointArray,
             int[] outputCodePoints, int[] outputScores, int[] outputIndices, int[] outputTypes,
             int[] outputAutoCommitFirstWordConfidence);
-    private static native float calcNormalizedScoreNative(int[] before, int[] after, int score);
-    private static native int editDistanceNative(int[] before, int[] after);
     private static native void addUnigramWordNative(long dict, int[] word, int probability,
             int[] shortcutTarget, int shortcutProbability, boolean isNotAWord,
             boolean isBlacklisted, int timestamp);
@@ -179,24 +174,9 @@ public final class BinaryDictionary extends Dictionary {
             LanguageModelParam[] languageModelParams, int startIndex);
     private static native int calculateProbabilityNative(long dict, int unigramProbability,
             int bigramProbability);
-    private static native int setCurrentTimeForTestNative(int currentTime);
     private static native String getPropertyNative(long dict, String query);
     private static native boolean isCorruptedNative(long dict);
 
-    public static boolean createEmptyDictFile(final String filePath, final long dictVersion,
-            final Locale locale, final Map<String, String> attributeMap) {
-        final String[] keyArray = new String[attributeMap.size()];
-        final String[] valueArray = new String[attributeMap.size()];
-        int index = 0;
-        for (final String key : attributeMap.keySet()) {
-            keyArray[index] = key;
-            valueArray[index] = attributeMap.get(key);
-            index++;
-        }
-        return createEmptyDictFileNative(filePath, dictVersion, locale.toString(), keyArray,
-                valueArray);
-    }
-
     // TODO: Move native dict into session
     private final void loadDictionary(final String path, final long startOffset,
             final long length, final boolean isUpdatable) {
@@ -323,20 +303,6 @@ public final class BinaryDictionary extends Dictionary {
         return getFormatVersionNative(mNativeDict);
     }
 
-    public static float calcNormalizedScore(final String before, final String after,
-            final int score) {
-        return calcNormalizedScoreNative(StringUtils.toCodePointArray(before),
-                StringUtils.toCodePointArray(after), score);
-    }
-
-    public static int editDistance(final String before, final String after) {
-        if (before == null || after == null) {
-            throw new IllegalArgumentException();
-        }
-        return editDistanceNative(StringUtils.toCodePointArray(before),
-                StringUtils.toCodePointArray(after));
-    }
-
     @Override
     public boolean isValidWord(final String word) {
         return getFrequency(word) != NOT_A_PROBABILITY;
@@ -497,22 +463,6 @@ public final class BinaryDictionary extends Dictionary {
         return calculateProbabilityNative(mNativeDict, unigramProbability, bigramProbability);
     }
 
-    /**
-     * Control the current time to be used in the native code. If currentTime >= 0, this method sets
-     * the current time and gets into test mode.
-     * In test mode, set timestamp is used as the current time in the native code.
-     * If currentTime < 0, quit the test mode and returns to using time() to get the current time.
-     *
-     * @param currentTime seconds since the unix epoch
-     * @return current time got in the native code.
-     */
-    @UsedForTesting
-    public static int setCurrentTimeForTest(final int currentTime) {
-        final int currentNativeTimestamp = setCurrentTimeForTestNative(currentTime);
-        PersonalizationHelper.currentTimeChangedForTesting(currentNativeTimestamp);
-        return currentNativeTimestamp;
-    }
-
     @UsedForTesting
     public String getPropertyForTest(final String query) {
         if (!isValidDictionary()) return "";
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index 26545acbd..7847738e0 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -27,6 +27,7 @@ import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
 import com.android.inputmethod.latin.makedict.WordProperty;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.utils.AsyncResultHolder;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.CombinedFormatUtils;
 import com.android.inputmethod.latin.utils.ExecutorUtils;
@@ -228,7 +229,7 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
     }
 
     private void createBinaryDictionaryLocked() {
-        BinaryDictionary.createEmptyDictFile(mDictFile.getAbsolutePath(),
+        BinaryDictionaryUtils.createEmptyDictFile(mDictFile.getAbsolutePath(),
                 DICTIONARY_FORMAT_VERSION, mLocale, getHeaderAttributeMap());
     }
 
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index f0e7d2f61..df25b0c29 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -22,6 +22,7 @@ import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.define.ProductionFlag;
 import com.android.inputmethod.latin.utils.AutoCorrectionUtils;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.BoundedTreeSet;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.StringUtils;
@@ -308,7 +309,7 @@ public final class Suggest {
         // than i because we added the typed word to mSuggestions without touching mScores.
         for (int i = 0; i < suggestionsSize - 1; ++i) {
             final SuggestedWordInfo cur = suggestions.get(i + 1);
-            final float normalizedScore = BinaryDictionary.calcNormalizedScore(
+            final float normalizedScore = BinaryDictionaryUtils.calcNormalizedScore(
                     typedWord, cur.toString(), cur.mScore);
             final String scoreInfoString;
             if (normalizedScore > 0) {
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
index 1050d1b0e..a50bad90a 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
@@ -22,6 +22,7 @@ import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.LocaleUtils;
 
 import java.io.File;
@@ -54,7 +55,7 @@ public class Ver4DictEncoder implements DictEncoder {
         if (!mDictPlacedDir.isDirectory()) {
             throw new UnsupportedFormatException("Given path is not a directory.");
         }
-        if (!BinaryDictionary.createEmptyDictFile(mDictPlacedDir.getAbsolutePath(),
+        if (!BinaryDictionaryUtils.createEmptyDictFile(mDictPlacedDir.getAbsolutePath(),
                 FormatSpec.VERSION4, LocaleUtils.constructLocaleFromString(
                 dict.mOptions.mAttributes.get(DictionaryHeader.DICTIONARY_LOCALE_KEY)),
                 dict.mOptions.mAttributes)) {
diff --git a/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java b/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
index dae36f7dd..a07e8eb6a 100644
--- a/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
+++ b/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
@@ -37,6 +37,7 @@ import com.android.inputmethod.latin.SynchronouslyLoadedContactsBinaryDictionary
 import com.android.inputmethod.latin.SynchronouslyLoadedUserBinaryDictionary;
 import com.android.inputmethod.latin.UserBinaryDictionary;
 import com.android.inputmethod.latin.utils.AdditionalSubtypeUtils;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.LocaleUtils;
 import com.android.inputmethod.latin.utils.StringUtils;
@@ -320,7 +321,7 @@ public final class AndroidSpellCheckerService extends SpellCheckerService
                     hasRecommendedSuggestions = false;
                 } else {
                     gatheredSuggestions = EMPTY_STRING_ARRAY;
-                    final float normalizedScore = BinaryDictionary.calcNormalizedScore(
+                    final float normalizedScore = BinaryDictionaryUtils.calcNormalizedScore(
                             mOriginalText, mBestSuggestion, mBestScore);
                     hasRecommendedSuggestions = (normalizedScore > mRecommendedThreshold);
                 }
@@ -355,7 +356,7 @@ public final class AndroidSpellCheckerService extends SpellCheckerService
                 final int bestScore = mScores[mLength - 1];
                 final String bestSuggestion = mSuggestions.get(0);
                 final float normalizedScore =
-                        BinaryDictionary.calcNormalizedScore(
+                        BinaryDictionaryUtils.calcNormalizedScore(
                                 mOriginalText, bestSuggestion.toString(), bestScore);
                 hasRecommendedSuggestions = (normalizedScore > mRecommendedThreshold);
                 if (DBG) {
diff --git a/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java b/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java
index 37c173f96..22b9b77d2 100644
--- a/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java
@@ -40,7 +40,7 @@ public final class AutoCorrectionUtils {
             final int autoCorrectionSuggestionScore = suggestion.mScore;
             // TODO: when the normalized score of the first suggestion is nearly equals to
             //       the normalized score of the second suggestion, behave less aggressive.
-            final float normalizedScore = BinaryDictionary.calcNormalizedScore(
+            final float normalizedScore = BinaryDictionaryUtils.calcNormalizedScore(
                     consideredWord, suggestion.mWord, autoCorrectionSuggestionScore);
             if (DBG) {
                 Log.d(TAG, "Normalized " + consideredWord + "," + suggestion + ","
@@ -71,9 +71,8 @@ public final class AutoCorrectionUtils {
         if (typedWordLength < MINIMUM_SAFETY_NET_CHAR_LENGTH) {
             return false;
         }
-        final int maxEditDistanceOfNativeDictionary =
-                (typedWordLength < 5 ? 2 : typedWordLength / 2) + 1;
-        final int distance = BinaryDictionary.editDistance(typedWord, suggestion);
+        final int maxEditDistanceOfNativeDictionary = (typedWordLength / 2) + 1;
+        final int distance = BinaryDictionaryUtils.editDistance(typedWord, suggestion);
         if (DBG) {
             Log.d(TAG, "Autocorrected edit distance = " + distance
                     + ", " + maxEditDistanceOfNativeDictionary);
diff --git a/java/src/com/android/inputmethod/latin/utils/BinaryDictionaryUtils.java b/java/src/com/android/inputmethod/latin/utils/BinaryDictionaryUtils.java
new file mode 100644
index 000000000..6872285ad
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/utils/BinaryDictionaryUtils.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2014 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 com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.latin.personalization.PersonalizationHelper;
+
+import java.util.Locale;
+import java.util.Map;
+
+public final class BinaryDictionaryUtils {
+    private static final String TAG = BinaryDictionaryUtils.class.getSimpleName();
+
+    private BinaryDictionaryUtils() {
+        // This utility class is not publicly instantiable.
+    }
+
+    static {
+        JniUtils.loadNativeLibrary();
+    }
+
+    private static native boolean createEmptyDictFileNative(String filePath, long dictVersion,
+            String locale, String[] attributeKeyStringArray, String[] attributeValueStringArray);
+    private static native float calcNormalizedScoreNative(int[] before, int[] after, int score);
+    private static native int editDistanceNative(int[] before, int[] after);
+    private static native int setCurrentTimeForTestNative(int currentTime);
+
+    public static boolean createEmptyDictFile(final String filePath, final long dictVersion,
+            final Locale locale, final Map<String, String> attributeMap) {
+        final String[] keyArray = new String[attributeMap.size()];
+        final String[] valueArray = new String[attributeMap.size()];
+        int index = 0;
+        for (final String key : attributeMap.keySet()) {
+            keyArray[index] = key;
+            valueArray[index] = attributeMap.get(key);
+            index++;
+        }
+        return createEmptyDictFileNative(filePath, dictVersion, locale.toString(), keyArray,
+                valueArray);
+    }
+
+    public static float calcNormalizedScore(final String before, final String after,
+            final int score) {
+        return calcNormalizedScoreNative(StringUtils.toCodePointArray(before),
+                StringUtils.toCodePointArray(after), score);
+    }
+
+    public static int editDistance(final String before, final String after) {
+        if (before == null || after == null) {
+            throw new IllegalArgumentException();
+        }
+        return editDistanceNative(StringUtils.toCodePointArray(before),
+                StringUtils.toCodePointArray(after));
+    }
+
+    /**
+     * Control the current time to be used in the native code. If currentTime >= 0, this method sets
+     * the current time and gets into test mode.
+     * In test mode, set timestamp is used as the current time in the native code.
+     * If currentTime < 0, quit the test mode and returns to using time() to get the current time.
+     *
+     * @param currentTime seconds since the unix epoch
+     * @return current time got in the native code.
+     */
+    @UsedForTesting
+    public static int setCurrentTimeForTest(final int currentTime) {
+        final int currentNativeTimestamp = setCurrentTimeForTestNative(currentTime);
+        PersonalizationHelper.currentTimeChangedForTesting(currentNativeTimestamp);
+        return currentNativeTimestamp;
+    }
+}
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionaryUtils.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionaryUtils.cpp
index 64034e78a..f72366481 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionaryUtils.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionaryUtils.cpp
@@ -130,7 +130,7 @@ static const JNINativeMethod sMethods[] = {
 };
 
 int register_BinaryDictionaryUtils(JNIEnv *env) {
-    const char *const kClassPathName = "com/android/inputmethod/latin/BinaryDictionary";
+    const char *const kClassPathName = "com/android/inputmethod/latin/utils/BinaryDictionaryUtils";
     return registerNativeMethods(env, kClassPathName, sMethods, NELEMS(sMethods));
 }
 } // namespace latinime
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
index fa5123665..69420d6ac 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
@@ -27,6 +27,7 @@ import com.android.inputmethod.latin.makedict.FormatSpec;
 import com.android.inputmethod.latin.makedict.FusionDictionary;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.FileUtils;
 import com.android.inputmethod.latin.utils.LocaleUtils;
 
@@ -111,7 +112,7 @@ public class BinaryDictionaryDecayingTests extends AndroidTestCase {
                 DictionaryHeader.ATTRIBUTE_VALUE_TRUE);
         attributeMap.put(DictionaryHeader.HAS_HISTORICAL_INFO_KEY,
                 DictionaryHeader.ATTRIBUTE_VALUE_TRUE);
-        if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(), FormatSpec.VERSION4,
+        if (BinaryDictionaryUtils.createEmptyDictFile(file.getAbsolutePath(), FormatSpec.VERSION4,
                 LocaleUtils.constructLocaleFromString(TEST_LOCALE), attributeMap)) {
             return file;
         } else {
@@ -121,11 +122,11 @@ public class BinaryDictionaryDecayingTests extends AndroidTestCase {
     }
 
     private static int setCurrentTimeForTestMode(final int currentTime) {
-        return BinaryDictionary.setCurrentTimeForTest(currentTime);
+        return BinaryDictionaryUtils.setCurrentTimeForTest(currentTime);
     }
 
     private static int stopTestModeInNativeCode() {
-        return BinaryDictionary.setCurrentTimeForTest(-1);
+        return BinaryDictionaryUtils.setCurrentTimeForTest(-1);
     }
 
     public void testReadDictInJavaSide() {
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
index c1adf6557..4f9245ce0 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
@@ -25,6 +25,7 @@ import com.android.inputmethod.latin.makedict.CodePointUtils;
 import com.android.inputmethod.latin.makedict.FormatSpec;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
 import com.android.inputmethod.latin.makedict.WordProperty;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.FileUtils;
 import com.android.inputmethod.latin.utils.LanguageModelParam;
 
@@ -59,7 +60,7 @@ public class BinaryDictionaryTests extends AndroidTestCase {
         file.delete();
         file.mkdir();
         Map<String, String> attributeMap = new HashMap<String, String>();
-        if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(), FormatSpec.VERSION4,
+        if (BinaryDictionaryUtils.createEmptyDictFile(file.getAbsolutePath(), FormatSpec.VERSION4,
                 Locale.ENGLISH, attributeMap)) {
             return file;
         } else {
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
index 0ee0fb577..80978df97 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
@@ -30,6 +30,7 @@ import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.ByteArrayDictBuffer;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 
@@ -77,7 +78,7 @@ public class BinaryDictDecoderEncoderTests extends AndroidTestCase {
 
     public BinaryDictDecoderEncoderTests(final long seed, final int maxUnigrams) {
         super();
-        BinaryDictionary.setCurrentTimeForTest(0);
+        BinaryDictionaryUtils.setCurrentTimeForTest(0);
         Log.e(TAG, "Testing dictionary: seed is " + seed);
         final Random random = new Random(seed);
         sWords.clear();
@@ -112,13 +113,13 @@ public class BinaryDictDecoderEncoderTests extends AndroidTestCase {
     @Override
     protected void setUp() throws Exception {
         super.setUp();
-        BinaryDictionary.setCurrentTimeForTest(0);
+        BinaryDictionaryUtils.setCurrentTimeForTest(0);
     }
 
     @Override
     protected void tearDown() throws Exception {
         // Quit test mode.
-        BinaryDictionary.setCurrentTimeForTest(-1);
+        BinaryDictionaryUtils.setCurrentTimeForTest(-1);
         super.tearDown();
     }
 
diff --git a/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
index 6ace2de4f..04840d667 100644
--- a/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
@@ -20,8 +20,8 @@ import android.test.AndroidTestCase;
 import android.test.suitebuilder.annotation.LargeTest;
 import android.util.Log;
 
-import com.android.inputmethod.latin.BinaryDictionary;
 import com.android.inputmethod.latin.ExpandableBinaryDictionary;
+import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.FileUtils;
 
@@ -79,11 +79,11 @@ public class UserHistoryDictionaryTests extends AndroidTestCase {
     }
 
     private static int setCurrentTimeForTestMode(final int currentTime) {
-        return BinaryDictionary.setCurrentTimeForTest(currentTime);
+        return BinaryDictionaryUtils.setCurrentTimeForTest(currentTime);
     }
 
     private static int stopTestModeInNativeCode() {
-        return BinaryDictionary.setCurrentTimeForTest(-1);
+        return BinaryDictionaryUtils.setCurrentTimeForTest(-1);
     }
 
     /**
diff --git a/tests/src/com/android/inputmethod/latin/EditDistanceTests.java b/tests/src/com/android/inputmethod/latin/utils/EditDistanceTests.java
index ffec20ab2..58312264b 100644
--- a/tests/src/com/android/inputmethod/latin/EditDistanceTests.java
+++ b/tests/src/com/android/inputmethod/latin/utils/EditDistanceTests.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.inputmethod.latin;
+package com.android.inputmethod.latin.utils;
 
 import android.test.AndroidTestCase;
 import android.test.suitebuilder.annotation.SmallTest;
@@ -29,7 +29,7 @@ public class EditDistanceTests extends AndroidTestCase {
      * sitting
      */
     public void testExample1() {
-        final int dist = BinaryDictionary.editDistance("kitten", "sitting");
+        final int dist = BinaryDictionaryUtils.editDistance("kitten", "sitting");
         assertEquals("edit distance between 'kitten' and 'sitting' is 3",
                 3, dist);
     }
@@ -42,26 +42,26 @@ public class EditDistanceTests extends AndroidTestCase {
      * S--unday
      */
     public void testExample2() {
-        final int dist = BinaryDictionary.editDistance("Saturday", "Sunday");
+        final int dist = BinaryDictionaryUtils.editDistance("Saturday", "Sunday");
         assertEquals("edit distance between 'Saturday' and 'Sunday' is 3",
                 3, dist);
     }
 
     public void testBothEmpty() {
-        final int dist = BinaryDictionary.editDistance("", "");
+        final int dist = BinaryDictionaryUtils.editDistance("", "");
         assertEquals("when both string are empty, no edits are needed",
                 0, dist);
     }
 
     public void testFirstArgIsEmpty() {
-        final int dist = BinaryDictionary.editDistance("", "aaaa");
+        final int dist = BinaryDictionaryUtils.editDistance("", "aaaa");
         assertEquals("when only one string of the arguments is empty,"
                  + " the edit distance is the length of the other.",
                  4, dist);
     }
 
     public void testSecoondArgIsEmpty() {
-        final int dist = BinaryDictionary.editDistance("aaaa", "");
+        final int dist = BinaryDictionaryUtils.editDistance("aaaa", "");
         assertEquals("when only one string of the arguments is empty,"
                  + " the edit distance is the length of the other.",
                  4, dist);
@@ -70,27 +70,27 @@ public class EditDistanceTests extends AndroidTestCase {
     public void testSameStrings() {
         final String arg1 = "The quick brown fox jumps over the lazy dog.";
         final String arg2 = "The quick brown fox jumps over the lazy dog.";
-        final int dist = BinaryDictionary.editDistance(arg1, arg2);
+        final int dist = BinaryDictionaryUtils.editDistance(arg1, arg2);
         assertEquals("when same strings are passed, distance equals 0.",
                 0, dist);
     }
 
     public void testSameReference() {
         final String arg = "The quick brown fox jumps over the lazy dog.";
-        final int dist = BinaryDictionary.editDistance(arg, arg);
+        final int dist = BinaryDictionaryUtils.editDistance(arg, arg);
         assertEquals("when same string references are passed, the distance equals 0.",
                 0, dist);
     }
 
     public void testNullArg() {
         try {
-            BinaryDictionary.editDistance(null, "aaa");
+            BinaryDictionaryUtils.editDistance(null, "aaa");
             fail("IllegalArgumentException should be thrown.");
         } catch (Exception e) {
             assertTrue(e instanceof IllegalArgumentException);
         }
         try {
-            BinaryDictionary.editDistance("aaa", null);
+            BinaryDictionaryUtils.editDistance("aaa", null);
             fail("IllegalArgumentException should be thrown.");
         } catch (Exception e) {
             assertTrue(e instanceof IllegalArgumentException);
diff --git a/tools/dicttool/Android.mk b/tools/dicttool/Android.mk
index b83ce57e3..b1dd7f653 100644
--- a/tools/dicttool/Android.mk
+++ b/tools/dicttool/Android.mk
@@ -41,6 +41,7 @@ USED_TARGETTED_UTILS := \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/SuggestedWords.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/WordComposer.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/settings/NativeSuggestOptions.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/BinaryDictionaryUtils.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/ByteArrayDictBuffer.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/CollectionUtils.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/CombinedFormatUtils.java \