Create empty dictionary file in native code.

Bug: 6669677
Change-Id: I46d23deee1fd091678f4593561cb8687eb815212

12 files changed, 133 insertions, 83 deletions

diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index fdde98da1..a463651d5 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -31,6 +31,7 @@ import java.io.File;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Locale;
+import java.util.Map;
 
 /**
  * Implements a static, compacted, binary dictionary of standard words.
@@ -104,6 +105,8 @@ public final class BinaryDictionary extends Dictionary {
         JniUtils.loadNativeLibrary();
     }
 
+    private static native boolean createEmptyDictFileNative(String filePath, long dictVersion,
+            String[] attributeKeyStringArray, String[] attributeValueStringArray);
     private static native long openNative(String sourceDir, long dictOffset, long dictSize,
             boolean isUpdatable);
     private static native void flushNative(long dict, String filePath);
@@ -127,6 +130,20 @@ public final class BinaryDictionary extends Dictionary {
     private static native int calculateProbabilityNative(long dict, int unigramProbability,
             int bigramProbability);
 
+    @UsedForTesting
+    public static boolean createEmptyDictFile(final String filePath, final long dictVersion,
+            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, keyArray, valueArray);
+    }
+
     // TODO: Move native dict into session
     private final void loadDictionary(final String path, final long startOffset,
             final long length, final boolean isUpdatable) {
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index 0774ce203..99859decf 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -22,12 +22,7 @@ import android.util.Log;
 
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
-import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.makedict.FusionDictionary;
-import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
-import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
 import com.android.inputmethod.latin.personalization.DynamicPersonalizationDictionaryWriter;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.utils.AsyncResultHolder;
@@ -35,9 +30,9 @@ import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.PrioritizedSerialExecutor;
 
 import java.io.File;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicReference;
 
@@ -68,8 +63,10 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
      */
     protected static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
 
-    private static final FormatSpec.FormatOptions FORMAT_OPTIONS =
-            new FormatSpec.FormatOptions(3 /* version */, true /* supportsDynamicUpdate */);
+    private static final int DICTIONARY_FORMAT_VERSION = 3;
+
+    private static final String SUPPORTS_DYNAMIC_UPDATE =
+            FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE;
 
     /**
      * A static map of time recorders, each of which records the time of accesses to a single binary
@@ -233,6 +230,13 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
         });
     }
 
+    protected Map<String, String> getHeaderAttributeMap() {
+        HashMap<String, String> attributeMap = new HashMap<String, String>();
+        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
+                SUPPORTS_DYNAMIC_UPDATE);
+        return attributeMap;
+    }
+
     protected void clear() {
         getExecutor(mFilename).execute(new Runnable() {
             @Override
@@ -240,17 +244,8 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
                 if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE && mDictionaryWriter == null) {
                     mBinaryDictionary.close();
                     final File file = new File(mContext.getFilesDir(), mFilename);
-                    final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                            new FusionDictionary.DictionaryOptions(new HashMap<String,String>(),
-                                    false, false));
-                    final DictEncoder dictEncoder = new Ver3DictEncoder(file);
-                    try {
-                        dictEncoder.writeDictionary(dict, FORMAT_OPTIONS);
-                    } catch (IOException e) {
-                        Log.e(TAG, "Exception in creating new dictionary file.", e);
-                    } catch (UnsupportedFormatException e) {
-                        Log.e(TAG, "Exception in creating new dictionary file.", e);
-                    }
+                    BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
+                            DICTIONARY_FORMAT_VERSION, getHeaderAttributeMap());
                 } else {
                     mDictionaryWriter.clear();
                 }
@@ -498,17 +493,8 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
             if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
                 if (mBinaryDictionary == null || !mBinaryDictionary.isValidDictionary()) {
                     final File file = new File(mContext.getFilesDir(), mFilename);
-                    final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                            new FusionDictionary.DictionaryOptions(new HashMap<String,String>(),
-                                    false, false));
-                    final DictEncoder dictEncoder = new Ver3DictEncoder(file);
-                    try {
-                        dictEncoder.writeDictionary(dict, FORMAT_OPTIONS);
-                    } catch (IOException e) {
-                        Log.e(TAG, "Exception in creating new dictionary file.", e);
-                    } catch (UnsupportedFormatException e) {
-                        Log.e(TAG, "Exception in creating new dictionary file.", e);
-                    }
+                    BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
+                            DICTIONARY_FORMAT_VERSION, getHeaderAttributeMap());
                 } else {
                     if (mBinaryDictionary.needsToRunGC()) {
                         mBinaryDictionary.flushWithGC();
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index aa5129ccb..849bff050 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -325,6 +325,12 @@ public final class FormatSpec {
         public final int mHeaderSize;
         public final DictionaryOptions mDictionaryOptions;
         public final FormatOptions mFormatOptions;
+        // Note that these are corresponding definitions in native code in latinime::HeaderPolicy
+        // and latinime::HeaderReadWriteUtils.
+        public static final String SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE = "SUPPORTS_DYNAMIC_UPDATE";
+        public static final String USES_FORGETTING_CURVE_ATTRIBUTE = "USES_FORGETTING_CURVE";
+        public static final String ATTRIBUTE_VALUE_TRUE = "1";
+
         private static final String DICTIONARY_VERSION_ATTRIBUTE = "version";
         private static final String DICTIONARY_LOCALE_ATTRIBUTE = "locale";
         private static final String DICTIONARY_ID_ATTRIBUTE = "dictionary";
diff --git a/java/src/com/android/inputmethod/latin/personalization/DynamicPredictionDictionaryBase.java b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
index 075d7e3c3..66517a800 100644
--- a/java/src/com/android/inputmethod/latin/personalization/DynamicPredictionDictionaryBase.java
+++ b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
@@ -34,12 +34,15 @@ import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.OnAddWordListe
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
 
 /**
- * This class is a base class of a dictionary for the personalized prediction language model.
+ * This class is a base class of a dictionary that supports decaying for the personalized language
+ * model.
  */
-public abstract class DynamicPredictionDictionaryBase extends ExpandableBinaryDictionary {
-    private static final String TAG = DynamicPredictionDictionaryBase.class.getSimpleName();
+public abstract class DecayingExpandableBinaryDictionaryBase extends ExpandableBinaryDictionary {
+    private static final String TAG = DecayingExpandableBinaryDictionaryBase.class.getSimpleName();
     public static final boolean DBG_SAVE_RESTORE = false;
     private static final boolean DBG_STRESS_TEST = false;
     private static final boolean PROFILE_SAVE_RESTORE = LatinImeLogger.sDBG;
@@ -60,8 +63,9 @@ public abstract class DynamicPredictionDictionaryBase extends ExpandableBinaryDi
     // Should always be false except when we use this class for test
     @UsedForTesting boolean mIsTest = false;
 
-    /* package */ DynamicPredictionDictionaryBase(final Context context, final String locale,
-            final SharedPreferences sp, final String dictionaryType, final String fileName) {
+    /* package */ DecayingExpandableBinaryDictionaryBase(final Context context,
+            final String locale, final SharedPreferences sp, final String dictionaryType,
+            final String fileName) {
         super(context, fileName, dictionaryType, true);
         mLocale = locale;
         mFileName = fileName;
@@ -84,6 +88,16 @@ public abstract class DynamicPredictionDictionaryBase extends ExpandableBinaryDi
     }
 
     @Override
+    protected Map<String, String> getHeaderAttributeMap() {
+        HashMap<String, String> attributeMap = new HashMap<String, String>();
+        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        return attributeMap;
+    }
+
+    @Override
     protected boolean hasContentChanged() {
         return false;
     }
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
index ab3de801c..c616a296c 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
@@ -46,7 +46,7 @@ public abstract class PersonalizationDictionaryUpdateSession {
 
     // TODO: Use a dynamic binary dictionary instead
     public WeakReference<PersonalizationDictionary> mDictionary;
-    public WeakReference<DynamicPredictionDictionaryBase> mPredictionDictionary;
+    public WeakReference<DecayingExpandableBinaryDictionaryBase> mPredictionDictionary;
     public final String mSystemLocale;
     public PersonalizationDictionaryUpdateSession(String locale) {
         mSystemLocale = locale;
@@ -60,15 +60,16 @@ public abstract class PersonalizationDictionaryUpdateSession {
         mDictionary = new WeakReference<PersonalizationDictionary>(dictionary);
     }
 
-    public void setPredictionDictionary(DynamicPredictionDictionaryBase dictionary) {
-        mPredictionDictionary = new WeakReference<DynamicPredictionDictionaryBase>(dictionary);
+    public void setPredictionDictionary(DecayingExpandableBinaryDictionaryBase dictionary) {
+        mPredictionDictionary =
+                new WeakReference<DecayingExpandableBinaryDictionaryBase>(dictionary);
     }
 
     protected PersonalizationDictionary getDictionary() {
         return mDictionary == null ? null : mDictionary.get();
     }
 
-    protected DynamicPredictionDictionaryBase getPredictionDictionary() {
+    protected DecayingExpandableBinaryDictionaryBase getPredictionDictionary() {
         return mPredictionDictionary == null ? null : mPredictionDictionary.get();
     }
 
@@ -81,7 +82,7 @@ public abstract class PersonalizationDictionaryUpdateSession {
     }
 
     private void unsetPredictionDictionary() {
-        final DynamicPredictionDictionaryBase dictionary = getPredictionDictionary();
+        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
         if (dictionary == null) {
             return;
         }
@@ -89,7 +90,7 @@ public abstract class PersonalizationDictionaryUpdateSession {
     }
 
     public void clearAndFlushPredictionDictionary(Context context) {
-        final DynamicPredictionDictionaryBase dictionary = getPredictionDictionary();
+        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
         if (dictionary == null) {
             return;
         }
@@ -105,7 +106,7 @@ public abstract class PersonalizationDictionaryUpdateSession {
     // TODO: Support multi locale to add bigram
     public void addBigramToPersonalizationDictionary(String word0, String word1, boolean isValid,
             int frequency) {
-        final DynamicPredictionDictionaryBase dictionary = getPredictionDictionary();
+        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
         if (dictionary == null) {
             return;
         }
@@ -116,7 +117,7 @@ public abstract class PersonalizationDictionaryUpdateSession {
     // TODO: Support multi locale to add bigram
     public void addBigramsToPersonalizationDictionary(
             final ArrayList<PersonalizationLanguageModelParam> lmParams) {
-        final DynamicPredictionDictionaryBase dictionary = getPredictionDictionary();
+        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
         if (dictionary == null) {
             return;
         }
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDictionary.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDictionary.java
index e80953c05..432954453 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDictionary.java
@@ -22,7 +22,7 @@ import com.android.inputmethod.latin.ExpandableBinaryDictionary;
 import android.content.Context;
 import android.content.SharedPreferences;
 
-public class PersonalizationPredictionDictionary extends DynamicPredictionDictionaryBase {
+public class PersonalizationPredictionDictionary extends DecayingExpandableBinaryDictionaryBase {
     private static final String NAME = PersonalizationPredictionDictionary.class.getSimpleName();
 
     /* package */ PersonalizationPredictionDictionary(final Context context, final String locale,
diff --git a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
index 4c1803bdf..55a90ee51 100644
--- a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
+++ b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
@@ -54,7 +54,7 @@ public final class UserHistoryDictionaryBigramList {
      * Called when loaded from the SQL DB.
      */
     public void addBigram(String word1, String word2, byte fcValue) {
-        if (DynamicPredictionDictionaryBase.DBG_SAVE_RESTORE) {
+        if (DecayingExpandableBinaryDictionaryBase.DBG_SAVE_RESTORE) {
             Log.d(TAG, "--- add bigram: " + word1 + ", " + word2 + ", " + fcValue);
         }
         final HashMap<String, Byte> map;
@@ -74,7 +74,7 @@ public final class UserHistoryDictionaryBigramList {
      * Called when inserted to the SQL DB.
      */
     public void updateBigram(String word1, String word2, byte fcValue) {
-        if (DynamicPredictionDictionaryBase.DBG_SAVE_RESTORE) {
+        if (DecayingExpandableBinaryDictionaryBase.DBG_SAVE_RESTORE) {
             Log.d(TAG, "--- update bigram: " + word1 + ", " + word2 + ", " + fcValue);
         }
         final HashMap<String, Byte> map;
diff --git a/java/src/com/android/inputmethod/latin/personalization/UserHistoryPredictionDictionary.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryPredictionDictionary.java
index b140c919b..38e308a4e 100644
--- a/java/src/com/android/inputmethod/latin/personalization/UserHistoryPredictionDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/UserHistoryPredictionDictionary.java
@@ -26,7 +26,7 @@ import android.content.SharedPreferences;
  * Locally gathers stats about the words user types and various other signals like auto-correction
  * cancellation or manual picks. This allows the keyboard to adapt to the typist over time.
  */
-public class UserHistoryPredictionDictionary extends DynamicPredictionDictionaryBase {
+public class UserHistoryPredictionDictionary extends DecayingExpandableBinaryDictionaryBase {
     /* package for tests */ static final String NAME =
             UserHistoryPredictionDictionary.class.getSimpleName();
     /* package */ UserHistoryPredictionDictionary(final Context context, final String locale,
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 7f47493b2..7761ec4d5 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -26,12 +26,55 @@
 #include "suggest/core/dictionary/dictionary.h"
 #include "suggest/core/suggest_options.h"
 #include "suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.h"
+#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
 #include "utils/autocorrection_threshold_utils.h"
 
 namespace latinime {
 
 class ProximityInfo;
 
+// TODO: Move to makedict.
+static jboolean latinime_BinaryDictionary_createEmptyDictFile(JNIEnv *env, jclass clazz,
+        jstring filePath, jlong dictVersion, jobjectArray attributeKeyStringArray,
+        jobjectArray attributeValueStringArray) {
+    const jsize filePathUtf8Length = env->GetStringUTFLength(filePath);
+    char filePathChars[filePathUtf8Length + 1];
+    env->GetStringUTFRegion(filePath, 0, env->GetStringLength(filePath), filePathChars);
+    filePathChars[filePathUtf8Length] = '\0';
+
+    const int keyCount = env->GetArrayLength(attributeKeyStringArray);
+    const int valueCount = env->GetArrayLength(attributeValueStringArray);
+    if (keyCount != valueCount) {
+        return false;
+    }
+
+    HeaderReadWriteUtils::AttributeMap attributeMap;
+    for (int i = 0; i < keyCount; i++) {
+        jstring keyString = static_cast<jstring>(
+                env->GetObjectArrayElement(attributeKeyStringArray, i));
+        const jsize keyUtf8Length = env->GetStringUTFLength(keyString);
+        char keyChars[keyUtf8Length + 1];
+        env->GetStringUTFRegion(keyString, 0, env->GetStringLength(keyString), keyChars);
+        keyChars[keyUtf8Length] = '\0';
+        HeaderReadWriteUtils::AttributeMap::key_type key;
+        HeaderReadWriteUtils::insertCharactersIntoVector(keyChars, &key);
+
+        jstring valueString = static_cast<jstring>(
+                env->GetObjectArrayElement(attributeValueStringArray, i));
+        const jsize valueUtf8Length = env->GetStringUTFLength(valueString);
+        char valueChars[valueUtf8Length + 1];
+        env->GetStringUTFRegion(valueString, 0, env->GetStringLength(valueString), valueChars);
+        valueChars[valueUtf8Length] = '\0';
+        HeaderReadWriteUtils::AttributeMap::mapped_type value;
+        HeaderReadWriteUtils::insertCharactersIntoVector(valueChars, &value);
+
+        attributeMap[key] = value;
+    }
+
+    return DictFileWritingUtils::createEmptyDictFile(filePathChars, static_cast<int>(dictVersion),
+            &attributeMap);
+}
+
 static jlong latinime_BinaryDictionary_open(JNIEnv *env, jclass clazz, jstring sourceDir,
         jlong dictOffset, jlong dictSize, jboolean isUpdatable) {
     PROF_OPEN;
@@ -282,6 +325,11 @@ static int latinime_BinaryDictionary_calculateProbabilityNative(JNIEnv *env, jcl
 
 static const JNINativeMethod sMethods[] = {
     {
+        const_cast<char *>("createEmptyDictFileNative"),
+        const_cast<char *>("(Ljava/lang/String;J[Ljava/lang/String;[Ljava/lang/String;)Z"),
+        reinterpret_cast<void *>(latinime_BinaryDictionary_createEmptyDictFile)
+    },
+    {
         const_cast<char *>("openNative"),
         const_cast<char *>("(Ljava/lang/String;JJZ)J"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_open)
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 9a32f64d4..7bbeacaa0 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
@@ -22,6 +22,8 @@
 
 namespace latinime {
 
+
+// Note that these are corresponding definitions in Java side in FormatSpec.FileHeader.
 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";
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 e6547675c..3b1c78085 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
@@ -45,6 +45,7 @@ const HeaderReadWriteUtils::DictionaryFlags
 const HeaderReadWriteUtils::DictionaryFlags
         HeaderReadWriteUtils::FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
 
+// Note that these are corresponding definitions in Java side in FormatSpec.FileHeader.
 const char *const HeaderReadWriteUtils::SUPPORTS_DYNAMIC_UPDATE_KEY = "SUPPORTS_DYNAMIC_UPDATE";
 const char *const HeaderReadWriteUtils::REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY =
         "REQUIRES_GERMAN_UMLAUT_PROCESSING";
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
index 96a2217a3..7ed3ee180 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
@@ -21,24 +21,18 @@ import android.test.suitebuilder.annotation.LargeTest;
 import android.util.Pair;
 
 import com.android.inputmethod.latin.makedict.CodePointUtils;
-import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.makedict.FusionDictionary;
-import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
-import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Locale;
+import java.util.Map;
 import java.util.Random;
 
 @LargeTest
 public class BinaryDictionaryTests extends AndroidTestCase {
-    private static final FormatSpec.FormatOptions FORMAT_OPTIONS =
-            new FormatSpec.FormatOptions(3 /* version */, true /* supportsDynamicUpdate */);
     private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
     private static final String TEST_LOCALE = "test";
 
@@ -52,15 +46,18 @@ public class BinaryDictionaryTests extends AndroidTestCase {
         super.tearDown();
     }
 
-    private File createEmptyDictionaryAndGetFile(final String filename) throws IOException,
-            UnsupportedFormatException {
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(new HashMap<String,String>(), false, false));
+    private File createEmptyDictionaryAndGetFile(final String filename) throws IOException {
         final File file = File.createTempFile(filename, TEST_DICT_FILE_EXTENSION,
                 getContext().getCacheDir());
-        final DictEncoder dictEncoder = new Ver3DictEncoder(file);
-        dictEncoder.writeDictionary(dict, FORMAT_OPTIONS);
-        return file;
+        Map<String, String> attributeMap = new HashMap<String, String>();
+        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
+                3 /* dictVersion */, attributeMap)) {
+            return file;
+        } else {
+            throw new IOException("Empty dictionary cannot be created.");
+        }
     }
 
     public void testIsValidDictionary() {
@@ -69,8 +66,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -95,8 +90,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -139,8 +132,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -169,8 +160,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -240,8 +229,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -294,8 +281,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -342,8 +327,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -392,8 +375,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
@@ -445,8 +426,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
 
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
@@ -516,8 +495,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
 
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
@@ -617,8 +594,6 @@ public class BinaryDictionaryTests extends AndroidTestCase {
             dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
         }
 
         final ArrayList<String> words = new ArrayList<String>();