diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index 4dee84a..226c3c8 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -28,6 +28,7 @@
 import com.android.inputmethod.latin.utils.FileUtils;
 import com.android.inputmethod.latin.utils.LanguageModelParam;
 import com.android.inputmethod.latin.utils.PrioritizedSerialExecutor;
+import com.android.inputmethod.latin.utils.WordProperty;
 
 import java.io.File;
 import java.util.ArrayList;
@@ -778,16 +779,24 @@
     }
 
     @UsedForTesting
-    protected void runAfterGcForDebug(final Runnable r) {
-        getExecutor(mDictName).executePrioritized(new Runnable() {
+    public void dumpAllWordsForDebug() {
+        reloadDictionaryIfRequired();
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
-                try {
-                    mBinaryDictionary.flushWithGC();
-                    r.run();
-                } finally {
-                    mDictNameDictionaryUpdateController.mProcessingLargeTask.set(false);
-                }
+                Log.d(TAG, "dictionary=" + mDictName);
+                int token = 0;
+                do {
+                    final BinaryDictionary.GetNextWordPropertyResult result =
+                            mBinaryDictionary.getNextWordProperty(token);
+                    final WordProperty wordProperty = result.mWordProperty;
+                    if (wordProperty == null) {
+                        Log.d(TAG, " dictionary is empty.");
+                        break;
+                    }
+                    Log.d(TAG, wordProperty.toString());
+                    token = result.mNextToken;
+                } while (token != 0);
             }
         });
     }
diff --git a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
index d636a25..cd6a3aa 100644
--- a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
+++ b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
@@ -17,21 +17,15 @@
 package com.android.inputmethod.latin.personalization;
 
 import android.content.Context;
-import android.util.Log;
 
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.ExpandableBinaryDictionary;
-import com.android.inputmethod.latin.makedict.DictDecoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
 import com.android.inputmethod.latin.utils.LanguageModelParam;
-import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils;
-import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.OnAddWordListener;
 
 import java.io.File;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Locale;
@@ -44,7 +38,6 @@
  */
 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_DUMP_ON_CLOSE = false;
 
     /** Any pair being typed or picked */
@@ -53,8 +46,6 @@
     public static final int FREQUENCY_FOR_WORDS_IN_DICTS = FREQUENCY_FOR_TYPED;
     public static final int FREQUENCY_FOR_WORDS_NOT_IN_DICTS = Dictionary.NOT_A_PROBABILITY;
 
-    public static final int REQUIRED_BINARY_DICTIONARY_VERSION = FormatSpec.VERSION4;
-
     /** The locale for this dictionary. */
     public final Locale mLocale;
 
@@ -161,57 +152,6 @@
     }
 
     @UsedForTesting
-    public void dumpAllWordsForDebug() {
-        runAfterGcForDebug(new Runnable() {
-            @Override
-            public void run() {
-                dumpAllWordsForDebugLocked();
-            }
-        });
-    }
-
-    private void dumpAllWordsForDebugLocked() {
-        Log.d(TAG, "dumpAllWordsForDebug started.");
-        final OnAddWordListener listener = new OnAddWordListener() {
-            @Override
-            public void setUnigram(final String word, final String shortcutTarget,
-                    final int frequency, final int shortcutFreq) {
-                Log.d(TAG, "load unigram: " + word + "," + frequency);
-            }
-
-            @Override
-            public void setBigram(final String word0, final String word1, final int frequency) {
-                if (word0.length() < Constants.DICTIONARY_MAX_WORD_LENGTH
-                        && word1.length() < Constants.DICTIONARY_MAX_WORD_LENGTH) {
-                    Log.d(TAG, "load bigram: " + word0 + "," + word1 + "," + frequency);
-                } else {
-                    Log.d(TAG, "Skip inserting a too long bigram: " + word0 + "," + word1 + ","
-                            + frequency);
-                }
-            }
-        };
-
-        // Load the dictionary from binary file
-        final File dictFile = new File(mContext.getFilesDir(), mDictName);
-        final DictDecoder dictDecoder = FormatSpec.getDictDecoder(dictFile,
-                DictDecoder.USE_BYTEARRAY);
-        if (dictDecoder == null) {
-            // This is an expected condition: we don't have a user history dictionary for this
-            // language yet. It will be created sometime later.
-            return;
-        }
-
-        try {
-            dictDecoder.openDictBuffer();
-            UserHistoryDictIOUtils.readDictionaryBinary(dictDecoder, listener);
-        } catch (IOException e) {
-            Log.d(TAG, "IOException on opening a bytebuffer", e);
-        } catch (UnsupportedFormatException e) {
-            Log.d(TAG, "Unsupported format, can't read the dictionary", e);
-        }
-    }
-
-    @UsedForTesting
     public void clearAndFlushDictionary() {
         // Clear the node structure on memory
         clear();
diff --git a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
deleted file mode 100644
index 55a90ee..0000000
--- a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * Copyright (C) 2012 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.personalization;
-
-import android.util.Log;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.utils.CollectionUtils;
-
-import java.util.HashMap;
-import java.util.Set;
-
-/**
- * A store of bigrams which will be updated when the user history dictionary is closed
- * All bigrams including stale ones in SQL DB should be stored in this class to avoid adding stale
- * bigrams when we write to the SQL DB.
- */
-@UsedForTesting
-public final class UserHistoryDictionaryBigramList {
-    public static final byte FORGETTING_CURVE_INITIAL_VALUE = 0;
-    private static final String TAG = UserHistoryDictionaryBigramList.class.getSimpleName();
-    private static final HashMap<String, Byte> EMPTY_BIGRAM_MAP = CollectionUtils.newHashMap();
-    private final HashMap<String, HashMap<String, Byte>> mBigramMap = CollectionUtils.newHashMap();
-    private int mSize = 0;
-
-    public void evictAll() {
-        mSize = 0;
-        mBigramMap.clear();
-    }
-
-    /**
-     * Called when the user typed a word.
-     */
-    @UsedForTesting
-    public void addBigram(String word1, String word2) {
-        addBigram(word1, word2, FORGETTING_CURVE_INITIAL_VALUE);
-    }
-
-    /**
-     * Called when loaded from the SQL DB.
-     */
-    public void addBigram(String word1, String word2, byte fcValue) {
-        if (DecayingExpandableBinaryDictionaryBase.DBG_SAVE_RESTORE) {
-            Log.d(TAG, "--- add bigram: " + word1 + ", " + word2 + ", " + fcValue);
-        }
-        final HashMap<String, Byte> map;
-        if (mBigramMap.containsKey(word1)) {
-            map = mBigramMap.get(word1);
-        } else {
-            map = CollectionUtils.newHashMap();
-            mBigramMap.put(word1, map);
-        }
-        if (!map.containsKey(word2)) {
-            ++mSize;
-            map.put(word2, fcValue);
-        }
-    }
-
-    /**
-     * Called when inserted to the SQL DB.
-     */
-    public void updateBigram(String word1, String word2, byte fcValue) {
-        if (DecayingExpandableBinaryDictionaryBase.DBG_SAVE_RESTORE) {
-            Log.d(TAG, "--- update bigram: " + word1 + ", " + word2 + ", " + fcValue);
-        }
-        final HashMap<String, Byte> map;
-        if (mBigramMap.containsKey(word1)) {
-            map = mBigramMap.get(word1);
-        } else {
-            return;
-        }
-        if (!map.containsKey(word2)) {
-            return;
-        }
-        map.put(word2, fcValue);
-    }
-
-    public int size() {
-        return mSize;
-    }
-
-    public boolean isEmpty() {
-        return mBigramMap.isEmpty();
-    }
-
-    public boolean containsKey(String word) {
-        return mBigramMap.containsKey(word);
-    }
-
-    public Set<String> keySet() {
-        return mBigramMap.keySet();
-    }
-
-    public HashMap<String, Byte> getBigrams(String word1) {
-        if (mBigramMap.containsKey(word1)) return mBigramMap.get(word1);
-        // TODO: lower case according to locale
-        final String lowerWord1 = word1.toLowerCase();
-        if (mBigramMap.containsKey(lowerWord1)) return mBigramMap.get(lowerWord1);
-        return EMPTY_BIGRAM_MAP;
-    }
-
-    public boolean removeBigram(String word1, String word2) {
-        final HashMap<String, Byte> set = getBigrams(word1);
-        if (set.isEmpty()) {
-            return false;
-        }
-        if (set.containsKey(word2)) {
-            set.remove(word2);
-            --mSize;
-            return true;
-        }
-        return false;
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
deleted file mode 100644
index 7af03da..0000000
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * Copyright (C) 2012 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.util.Log;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.makedict.BinaryDictIOUtils;
-import com.android.inputmethod.latin.makedict.DictDecoder;
-import com.android.inputmethod.latin.makedict.DictEncoder;
-import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
-import com.android.inputmethod.latin.makedict.FusionDictionary;
-import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
-import com.android.inputmethod.latin.makedict.PendingAttribute;
-import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.personalization.UserHistoryDictionaryBigramList;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.Map.Entry;
-import java.util.TreeMap;
-import java.util.concurrent.TimeUnit;
-
-/**
- * Reads and writes Binary files for a UserHistoryDictionary.
- *
- * All the methods in this class are static.
- */
-public final class UserHistoryDictIOUtils {
-    private static final String TAG = UserHistoryDictIOUtils.class.getSimpleName();
-    private static final boolean DEBUG = false;
-
-    public interface OnAddWordListener {
-        /**
-         * Callback to be notified when a word is added to the dictionary.
-         * @param word The added word.
-         * @param shortcutTarget A shortcut target for this word, or null if none.
-         * @param frequency The frequency for this word.
-         * @param shortcutFreq The frequency of the shortcut (0~15, with 15 = whitelist).
-         *   Unspecified if shortcutTarget is null - do not rely on its value.
-         */
-        public void setUnigram(final String word, final String shortcutTarget, final int frequency,
-                final int shortcutFreq);
-        public void setBigram(final String word1, final String word2, final int frequency);
-    }
-
-    @UsedForTesting
-    public interface BigramDictionaryInterface {
-        public int getFrequency(final String word1, final String word2);
-    }
-
-    /**
-     * Writes dictionary to file.
-     */
-    @UsedForTesting
-    public static void writeDictionary(final DictEncoder dictEncoder,
-            final BigramDictionaryInterface dict, final UserHistoryDictionaryBigramList bigrams,
-            final FormatOptions formatOptions, final HashMap<String, String> options) {
-        final FusionDictionary fusionDict = constructFusionDictionary(dict, bigrams, options);
-        fusionDict.addOptionAttribute(FormatSpec.FileHeader.USES_FORGETTING_CURVE_KEY,
-            FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
-        fusionDict.addOptionAttribute(FormatSpec.FileHeader.DICTIONARY_DATE_KEY,
-                String.valueOf(TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())));
-        try {
-            dictEncoder.writeDictionary(fusionDict, formatOptions);
-            Log.d(TAG, "end writing");
-        } catch (IOException e) {
-            Log.e(TAG, "IO exception while writing file", e);
-        } catch (UnsupportedFormatException e) {
-            Log.e(TAG, "Unsupported format", e);
-        }
-    }
-
-    /**
-     * Constructs a new FusionDictionary from BigramDictionaryInterface.
-     */
-    @UsedForTesting
-    static FusionDictionary constructFusionDictionary(final BigramDictionaryInterface dict,
-            final UserHistoryDictionaryBigramList bigrams, final HashMap<String, String> options) {
-        final FusionDictionary fusionDict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(options));
-        int profTotal = 0;
-        for (final String word1 : bigrams.keySet()) {
-            final HashMap<String, Byte> word1Bigrams = bigrams.getBigrams(word1);
-            for (final String word2 : word1Bigrams.keySet()) {
-                final int freq = dict.getFrequency(word1, word2);
-                if (freq == -1) {
-                    // don't add this bigram.
-                    continue;
-                }
-                if (DEBUG) {
-                    if (word1 == null) {
-                        Log.d(TAG, "add unigram: " + word2 + "," + Integer.toString(freq));
-                    } else {
-                        Log.d(TAG, "add bigram: " + word1
-                                + "," + word2 + "," + Integer.toString(freq));
-                    }
-                    profTotal++;
-                }
-                if (word1 == null) { // unigram
-                    fusionDict.add(word2, freq, null, false /* isNotAWord */);
-                } else { // bigram
-                    if (FusionDictionary.findWordInTree(fusionDict.mRootNodeArray, word1) == null) {
-                        fusionDict.add(word1, 2, null, false /* isNotAWord */);
-                    }
-                    fusionDict.setBigram(word1, word2, freq);
-                }
-                bigrams.updateBigram(word1, word2, (byte)freq);
-            }
-        }
-        if (DEBUG) {
-            Log.d(TAG, "add " + profTotal + "words");
-        }
-        return fusionDict;
-    }
-
-    /**
-     * Reads dictionary from file.
-     */
-    public static void readDictionaryBinary(final DictDecoder dictDecoder,
-            final OnAddWordListener dict) {
-        final TreeMap<Integer, String> unigrams = CollectionUtils.newTreeMap();
-        final TreeMap<Integer, Integer> frequencies = CollectionUtils.newTreeMap();
-        final TreeMap<Integer, ArrayList<PendingAttribute>> bigrams = CollectionUtils.newTreeMap();
-        try {
-            dictDecoder.readUnigramsAndBigramsBinary(unigrams, frequencies, bigrams);
-        } catch (IOException e) {
-            Log.e(TAG, "IO exception while reading file", e);
-        } catch (UnsupportedFormatException e) {
-            Log.e(TAG, "Unsupported format", e);
-        } catch (ArrayIndexOutOfBoundsException e) {
-            Log.e(TAG, "ArrayIndexOutOfBoundsException while reading file", e);
-        }
-        addWordsFromWordMap(unigrams, frequencies, bigrams, dict);
-    }
-
-    /**
-     * Adds all unigrams and bigrams in maps to OnAddWordListener.
-     */
-    @UsedForTesting
-    static void addWordsFromWordMap(final TreeMap<Integer, String> unigrams,
-            final TreeMap<Integer, Integer> frequencies,
-            final TreeMap<Integer, ArrayList<PendingAttribute>> bigrams,
-            final OnAddWordListener to) {
-        for (Entry<Integer, String> entry : unigrams.entrySet()) {
-            final String word1 = entry.getValue();
-            final int unigramFrequency = frequencies.get(entry.getKey());
-            to.setUnigram(word1, null /* shortcutTarget */, unigramFrequency, 0 /* shortcutFreq */);
-            final ArrayList<PendingAttribute> attrList = bigrams.get(entry.getKey());
-            if (attrList != null) {
-                for (final PendingAttribute attr : attrList) {
-                    final String word2 = unigrams.get(attr.mAddress);
-                    if (word1 == null || word2 == null) {
-                        Log.e(TAG, "Invalid bigram pair detected: " + word1 + ", " + word2);
-                        continue;
-                    }
-                    to.setBigram(word1, word2,
-                            BinaryDictIOUtils.reconstructBigramFrequency(unigramFrequency,
-                                    attr.mFrequency));
-                }
-            }
-        }
-
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/utils/WordProperty.java b/java/src/com/android/inputmethod/latin/utils/WordProperty.java
index ba9b114..fed5d33 100644
--- a/java/src/com/android/inputmethod/latin/utils/WordProperty.java
+++ b/java/src/com/android/inputmethod/latin/utils/WordProperty.java
@@ -41,7 +41,7 @@
     // package.
     public static final class ProbabilityInfo {
         public final int mProbability;
-        // wTimestamp, mLevel and mCount are historical info. These values are depend on the
+        // mTimestamp, mLevel and mCount are historical info. These values are depend on the
         // implementation in native code; thus, we must not use them and have any assumptions about
         // them except for tests.
         public final int mTimestamp;
@@ -54,6 +54,11 @@
             mLevel = probabilityInfo[BinaryDictionary.FORMAT_WORD_PROPERTY_LEVEL_INDEX];
             mCount = probabilityInfo[BinaryDictionary.FORMAT_WORD_PROPERTY_COUNT_INDEX];
         }
+
+        @Override
+        public String toString() {
+            return mTimestamp + ":" + mLevel + ":" + mCount;
+        }
     }
 
     private static int getCodePointCount(final int[] codePoints) {
@@ -105,4 +110,44 @@
     public boolean isValid() {
         return mProbabilityInfo.mProbability != BinaryDictionary.NOT_A_PROBABILITY;
     }
+
+    @Override
+    public String toString() {
+        // TODO: Move this logic to CombinedInputOutput.
+        final StringBuffer builder = new StringBuffer();
+        builder.append(" word=" + mCodePoints);
+        builder.append(",");
+        builder.append("f=" + mProbabilityInfo.mProbability);
+        if (mIsNotAWord) {
+            builder.append(",");
+            builder.append("not_a_word=true");
+        }
+        if (mIsBlacklisted) {
+            builder.append(",");
+            builder.append("blacklisted=true");
+        }
+        if (mProbabilityInfo.mTimestamp != BinaryDictionary.NOT_A_VALID_TIMESTAMP) {
+            builder.append(",");
+            builder.append("historicalInfo=" + mProbabilityInfo);
+        }
+        builder.append("\n");
+        for (int i = 0; i < mBigramTargets.size(); i++) {
+            builder.append("  bigram=" + mBigramTargets.get(i).mWord);
+            builder.append(",");
+            builder.append("f=" + mBigramTargets.get(i).mFrequency);
+            if (mBigramProbabilityInfo.get(i).mTimestamp
+                    != BinaryDictionary.NOT_A_VALID_TIMESTAMP) {
+                builder.append(",");
+                builder.append("historicalInfo=" + mBigramProbabilityInfo.get(i));
+            }
+            builder.append("\n");
+        }
+        for (int i = 0; i < mShortcutTargets.size(); i++) {
+            builder.append("  shortcut=" + mShortcutTargets.get(i).mWord);
+            builder.append(",");
+            builder.append("f=" + mShortcutTargets.get(i).mFrequency);
+            builder.append("\n");
+        }
+        return builder.toString();
+    }
 }
\ No newline at end of file
diff --git a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
deleted file mode 100644
index 93731b3..0000000
--- a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
+++ /dev/null
@@ -1,244 +0,0 @@
-/*
- * Copyright (C) 2012 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.Context;
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.LargeTest;
-import android.util.Log;
-
-import com.android.inputmethod.latin.makedict.DictDecoder;
-import com.android.inputmethod.latin.makedict.DictEncoder;
-import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
-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.makedict.Ver2DictDecoder;
-import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
-import com.android.inputmethod.latin.personalization.UserHistoryDictionaryBigramList;
-import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.BigramDictionaryInterface;
-import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.OnAddWordListener;
-
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-
-/**
- * Unit tests for UserHistoryDictIOUtils
- */
-@LargeTest
-public class UserHistoryDictIOUtilsTests extends AndroidTestCase
-    implements BigramDictionaryInterface {
-
-    private static final String TAG = UserHistoryDictIOUtilsTests.class.getSimpleName();
-    private static final int UNIGRAM_FREQUENCY = 50;
-    private static final int BIGRAM_FREQUENCY = 100;
-    private static final ArrayList<String> NOT_HAVE_BIGRAM = new ArrayList<String>();
-    private static final FormatSpec.FormatOptions FORMAT_OPTIONS = new FormatSpec.FormatOptions(2);
-    private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
-    private static final HashMap<String, String> HEADER_OPTIONS = new HashMap<String, String>();
-    static {
-        HEADER_OPTIONS.put(FileHeader.DICTIONARY_LOCALE_KEY, "en_US");
-        HEADER_OPTIONS.put(FileHeader.DICTIONARY_ID_KEY, "test");
-        HEADER_OPTIONS.put(FileHeader.DICTIONARY_VERSION_KEY, "1000");
-    }
-
-    /**
-     * Return same frequency for all words and bigrams
-     */
-    @Override
-    public int getFrequency(String word1, String word2) {
-        if (word1 == null) return UNIGRAM_FREQUENCY;
-        return BIGRAM_FREQUENCY;
-    }
-
-    // Utilities for Testing
-
-    private void addWord(final String word,
-            final HashMap<String, ArrayList<String> > addedWords) {
-        if (!addedWords.containsKey(word)) {
-            addedWords.put(word, new ArrayList<String>());
-        }
-    }
-
-    private void addBigram(final String word1, final String word2,
-            final HashMap<String, ArrayList<String> > addedWords) {
-        addWord(word1, addedWords);
-        addWord(word2, addedWords);
-        addedWords.get(word1).add(word2);
-    }
-
-    private void addBigramToBigramList(final String word1, final String word2,
-            final HashMap<String, ArrayList<String> > addedWords,
-            final UserHistoryDictionaryBigramList bigramList) {
-        bigramList.addBigram(null, word1);
-        bigramList.addBigram(word1, word2);
-
-        addBigram(word1, word2, addedWords);
-    }
-
-    private void checkWordInFusionDict(final FusionDictionary dict, final String word,
-            final ArrayList<String> expectedBigrams) {
-        final PtNode ptNode = FusionDictionary.findWordInTree(dict.mRootNodeArray, word);
-        assertNotNull(ptNode);
-        assertTrue(ptNode.isTerminal());
-
-        for (final String bigram : expectedBigrams) {
-            assertNotNull(ptNode.getBigram(bigram));
-        }
-    }
-
-    private void checkWordsInFusionDict(final FusionDictionary dict,
-            final HashMap<String, ArrayList<String> > bigrams) {
-        for (final String word : bigrams.keySet()) {
-            if (bigrams.containsKey(word)) {
-                checkWordInFusionDict(dict, word, bigrams.get(word));
-            } else {
-                checkWordInFusionDict(dict, word, NOT_HAVE_BIGRAM);
-            }
-        }
-    }
-
-    private void checkWordInBigramList(
-            final UserHistoryDictionaryBigramList bigramList, final String word,
-            final ArrayList<String> expectedBigrams) {
-        // check unigram
-        final HashMap<String,Byte> unigramMap = bigramList.getBigrams(null);
-        assertTrue(unigramMap.containsKey(word));
-
-        // check bigrams
-        final ArrayList<String> actualBigrams = new ArrayList<String>(
-                bigramList.getBigrams(word).keySet());
-
-        Collections.sort(expectedBigrams);
-        Collections.sort(actualBigrams);
-        assertEquals(expectedBigrams, actualBigrams);
-    }
-
-    private void checkWordsInBigramList(final UserHistoryDictionaryBigramList bigramList,
-            final HashMap<String, ArrayList<String> > addedWords) {
-        for (final String word : addedWords.keySet()) {
-            if (addedWords.containsKey(word)) {
-                checkWordInBigramList(bigramList, word, addedWords.get(word));
-            } else {
-                checkWordInBigramList(bigramList, word, NOT_HAVE_BIGRAM);
-            }
-        }
-    }
-
-    private void writeDictToFile(final File file,
-            final UserHistoryDictionaryBigramList bigramList) {
-        final DictEncoder dictEncoder = new Ver2DictEncoder(file);
-        UserHistoryDictIOUtils.writeDictionary(dictEncoder, this, bigramList, FORMAT_OPTIONS,
-                HEADER_OPTIONS);
-    }
-
-    private void readDictFromFile(final File file, final OnAddWordListener listener)
-            throws IOException, FileNotFoundException, UnsupportedFormatException {
-        final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file, DictDecoder.USE_BYTEARRAY);
-        dictDecoder.openDictBuffer();
-        UserHistoryDictIOUtils.readDictionaryBinary(dictDecoder, listener);
-    }
-
-    public void testGenerateFusionDictionary() {
-        final UserHistoryDictionaryBigramList originalList = new UserHistoryDictionaryBigramList();
-
-        final HashMap<String, ArrayList<String> > addedWords =
-                new HashMap<String, ArrayList<String>>();
-        addBigramToBigramList("this", "is", addedWords, originalList);
-        addBigramToBigramList("this", "was", addedWords, originalList);
-        addBigramToBigramList("hello", "world", addedWords, originalList);
-
-        final FusionDictionary fusionDict = UserHistoryDictIOUtils.constructFusionDictionary(
-                this, originalList, HEADER_OPTIONS);
-
-        checkWordsInFusionDict(fusionDict, addedWords);
-    }
-
-    public void testReadAndWrite() throws IOException, FileNotFoundException,
-            UnsupportedFormatException {
-        final Context context = getContext();
-
-        File file = null;
-        try {
-            file = File.createTempFile("testReadAndWrite", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-            Log.d(TAG, "IOException while creating a temporary file", e);
-        }
-        assertNotNull(file);
-
-        // make original dictionary
-        final UserHistoryDictionaryBigramList originalList = new UserHistoryDictionaryBigramList();
-        final HashMap<String, ArrayList<String>> addedWords = CollectionUtils.newHashMap();
-        addBigramToBigramList("this" , "is"   , addedWords, originalList);
-        addBigramToBigramList("this" , "was"  , addedWords, originalList);
-        addBigramToBigramList("is"   , "not"  , addedWords, originalList);
-        addBigramToBigramList("hello", "world", addedWords, originalList);
-
-        // write to file
-        writeDictToFile(file, originalList);
-
-        // make result dict.
-        final UserHistoryDictionaryBigramList resultList = new UserHistoryDictionaryBigramList();
-        final OnAddWordListener listener = new OnAddWordListener() {
-            @Override
-            public void setUnigram(final String word, final String shortcutTarget,
-                    final int frequency, final int shortcutFreq) {
-                Log.d(TAG, "in: setUnigram: " + word + "," + frequency);
-                resultList.addBigram(null, word, (byte)frequency);
-            }
-            @Override
-            public void setBigram(final String word1, final String word2, final int frequency) {
-                Log.d(TAG, "in: setBigram: " + word1 + "," + word2 + "," + frequency);
-                resultList.addBigram(word1, word2, (byte)frequency);
-            }
-        };
-
-        // load from file
-        readDictFromFile(file, listener);
-        checkWordsInBigramList(resultList, addedWords);
-
-        // add new bigram
-        addBigramToBigramList("hello", "java", addedWords, resultList);
-
-        // rewrite
-        writeDictToFile(file, resultList);
-        final UserHistoryDictionaryBigramList resultList2 = new UserHistoryDictionaryBigramList();
-        final OnAddWordListener listener2 = new OnAddWordListener() {
-            @Override
-            public void setUnigram(final String word, final String shortcutTarget,
-                    final int frequency, final int shortcutFreq) {
-                Log.d(TAG, "in: setUnigram: " + word + "," + frequency);
-                resultList2.addBigram(null, word, (byte)frequency);
-            }
-            @Override
-            public void setBigram(final String word1, final String word2, final int frequency) {
-                Log.d(TAG, "in: setBigram: " + word1 + "," + word2 + "," + frequency);
-                resultList2.addBigram(word1, word2, (byte)frequency);
-            }
-        };
-
-        // load from file
-        readDictFromFile(file, listener2);
-        checkWordsInBigramList(resultList2, addedWords);
-    }
-}