Remove flags from Java side.

This simplifies the code quite a bit.
- GERMAN_UMLAUTS are now handled through a key-value attribute.
  The dictionary generator does not need to know about it any more.
- FRENCH_LIGATURES are deprecated as we handle them with shortcuts now.
- CONTAINS_BIGRAMS is deprecated. Bigram processing is always applied
  regardless of this flag.

Bug: 11281748
Change-Id: If567e52e245a9342adc7f3104a0f7d8d782df8c1

14 files changed, 70 insertions, 267 deletions

diff --git a/java/src/com/android/inputmethod/latin/DictionaryWriter.java b/java/src/com/android/inputmethod/latin/DictionaryWriter.java
index f960c5343..89ef96d7f 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryWriter.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryWriter.java
@@ -18,8 +18,6 @@ package com.android.inputmethod.latin;
 
 import android.content.Context;
 
-import com.android.inputmethod.keyboard.ProximityInfo;
-import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
 import com.android.inputmethod.latin.makedict.FusionDictionary;
@@ -52,7 +50,7 @@ public class DictionaryWriter extends AbstractDictionaryWriter {
     public void clear() {
         final HashMap<String, String> attributes = CollectionUtils.newHashMap();
         mFusionDictionary = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(attributes, false, false));
+                new FusionDictionary.DictionaryOptions(attributes));
     }
 
     /**
diff --git a/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
index bbbb8e461..f8fa68f45 100644
--- a/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
@@ -58,12 +58,9 @@ public abstract class AbstractDictDecoder implements DictDecoder {
                 headerSize);
 
         final FileHeader header = new FileHeader(headerSize,
-                new FusionDictionary.DictionaryOptions(attributes,
-                        0 != (optionsFlags & FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG),
-                        0 != (optionsFlags & FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG)),
-                        new FormatOptions(version,
-                                0 != (optionsFlags & FormatSpec.SUPPORTS_DYNAMIC_UPDATE),
-                                0 != (optionsFlags & FormatSpec.CONTAINS_TIMESTAMP_FLAG)));
+                new FusionDictionary.DictionaryOptions(attributes),
+                new FormatOptions(version,
+                        0 != (optionsFlags & FormatSpec.CONTAINS_TIMESTAMP_FLAG)));
         return header;
     }
 
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
index 83ee7d685..7f0aa777f 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
@@ -330,7 +330,7 @@ public final class BinaryDictDecoderUtils {
 
     static int readChildrenAddress(final DictBuffer dictBuffer,
             final int optionFlags, final FormatOptions options) {
-        if (options.mSupportsDynamicUpdate) {
+        if (options.supportsDynamicUpdate()) {
             final int address = dictBuffer.readUnsignedInt24();
             if (address == 0) return FormatSpec.NO_CHILDREN_ADDRESS;
             if ((address & FormatSpec.MSB24) != 0) {
@@ -540,11 +540,11 @@ public final class BinaryDictDecoderUtils {
             }
 
             // reach the end of the array.
-            if (options.mSupportsDynamicUpdate) {
+            if (options.supportsDynamicUpdate()) {
                 final boolean hasValidForwardLink = dictDecoder.readAndFollowForwardLink();
                 if (!hasValidForwardLink) break;
             }
-        } while (options.mSupportsDynamicUpdate && dictDecoder.hasNextPtNodeArray());
+        } while (options.supportsDynamicUpdate() && dictDecoder.hasNextPtNodeArray());
 
         final PtNodeArray nodeArray = new PtNodeArray(nodeArrayContents);
         nodeArray.mCachedAddressBeforeUpdate = nodeArrayOriginPos;
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
index c0dad3db2..8ba0797de 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
@@ -20,7 +20,6 @@ import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncodin
 import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
-import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
 
@@ -161,7 +160,7 @@ public class BinaryDictEncoderUtils {
             node.mCachedSize = nodeSize;
             size += nodeSize;
         }
-        if (options.mSupportsDynamicUpdate) {
+        if (options.supportsDynamicUpdate()) {
             size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
         }
         ptNodeArray.mCachedSize = size;
@@ -398,7 +397,7 @@ public class BinaryDictEncoderUtils {
                     nodeSize += FormatSpec.PTNODE_FREQUENCY_SIZE;
                 }
             }
-            if (formatOptions.mSupportsDynamicUpdate) {
+            if (formatOptions.supportsDynamicUpdate()) {
                 nodeSize += FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
             } else if (null != ptNode.mChildren) {
                 nodeSize += getByteSize(getOffsetToTargetNodeArrayDuringUpdate(ptNodeArray,
@@ -418,7 +417,7 @@ public class BinaryDictEncoderUtils {
             ptNode.mCachedSize = nodeSize;
             size += nodeSize;
         }
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
         }
         if (ptNodeArray.mCachedSize != size) {
@@ -534,7 +533,7 @@ public class BinaryDictEncoderUtils {
             if (passes > MAX_PASSES) throw new RuntimeException("Too many passes - probably a bug");
         } while (changesDone);
 
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             computeParentAddresses(flatNodes);
         }
         final PtNodeArray lastPtNodeArray = flatNodes.get(flatNodes.size() - 1);
@@ -643,7 +642,7 @@ public class BinaryDictEncoderUtils {
         byte flags = 0;
         if (hasMultipleChars) flags |= FormatSpec.FLAG_HAS_MULTIPLE_CHARS;
         if (isTerminal) flags |= FormatSpec.FLAG_IS_TERMINAL;
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             flags |= FormatSpec.FLAG_IS_NOT_MOVED;
         } else if (true) {
             switch (childrenAddressSize) {
@@ -755,16 +754,11 @@ public class BinaryDictEncoderUtils {
     }
 
     /**
-     * Makes the 2-byte value for options flags.
+     * Makes the 2-byte value for options flags. Unused at the moment, and always 0.
      */
-    private static final int makeOptionsValue(final FusionDictionary dictionary,
-            final FormatOptions formatOptions) {
-        final DictionaryOptions options = dictionary.mOptions;
-        final boolean hasBigrams = dictionary.hasBigrams();
-        return (options.mFrenchLigatureProcessing ? FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG : 0)
-                + (options.mGermanUmlautProcessing ? FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG : 0)
-                + (hasBigrams ? FormatSpec.CONTAINS_BIGRAMS_FLAG : 0)
-                + (formatOptions.mSupportsDynamicUpdate ? FormatSpec.SUPPORTS_DYNAMIC_UPDATE : 0);
+    private static final int makeOptionsValue(final FormatOptions formatOptions) {
+        // TODO: why doesn't this handle CONTAINS_TIMESTAMP_FLAG?
+        return 0;
     }
 
     /**
@@ -852,7 +846,7 @@ public class BinaryDictEncoderUtils {
             }
             dictEncoder.writePtNode(ptNode, parentPosition, formatOptions, dict);
         }
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             dictEncoder.writeForwardLinkAddress(FormatSpec.NO_FORWARD_LINK_ADDRESS);
         }
         if (dictEncoder.getPosition() != ptNodeArray.mCachedAddressAfterUpdate
@@ -953,7 +947,7 @@ public class BinaryDictEncoderUtils {
         headerBuffer.write((byte) (0xFF & version));
 
         // Options flags
-        final int options = makeOptionsValue(dict, formatOptions);
+        final int options = makeOptionsValue(formatOptions);
         headerBuffer.write((byte) (0xFF & (options >> 8)));
         headerBuffer.write((byte) (0xFF & options));
         final int headerSizeOffset = headerBuffer.size();
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
index 86ebf5844..640d778bb 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
@@ -112,7 +112,7 @@ public final class BinaryDictIOUtils {
             }
 
             if (p.mPosition == p.mNumOfPtNode) {
-                if (formatOptions.mSupportsDynamicUpdate) {
+                if (formatOptions.supportsDynamicUpdate()) {
                     final boolean hasValidForwardLinkAddress =
                             dictDecoder.readAndFollowForwardLink();
                     if (hasValidForwardLinkAddress && dictDecoder.hasNextPtNodeArray()) {
@@ -228,7 +228,7 @@ public final class BinaryDictIOUtils {
                 // a forward link address that we need to consult and possibly resume
                 // search on the next node array in the linked list.
                 if (foundNextPtNode) break;
-                if (!header.mFormatOptions.mSupportsDynamicUpdate) {
+                if (!header.mFormatOptions.supportsDynamicUpdate()) {
                     return FormatSpec.NOT_VALID_WORD;
                 }
 
@@ -507,7 +507,7 @@ public final class BinaryDictIOUtils {
      * Helper method to check whether the node is moved.
      */
     public static boolean isMovedPtNode(final int flags, final FormatOptions options) {
-        return options.mSupportsDynamicUpdate
+        return options.supportsDynamicUpdate()
                 && ((flags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) == FormatSpec.FLAG_IS_MOVED);
     }
 
@@ -516,14 +516,14 @@ public final class BinaryDictIOUtils {
      */
     public static boolean supportsDynamicUpdate(final FormatOptions options) {
         return options.mVersion >= FormatSpec.FIRST_VERSION_WITH_DYNAMIC_UPDATE
-                && options.mSupportsDynamicUpdate;
+                && options.supportsDynamicUpdate();
     }
 
     /**
      * Helper method to check whether the node is deleted.
      */
     public static boolean isDeletedPtNode(final int flags, final FormatOptions formatOptions) {
-        return formatOptions.mSupportsDynamicUpdate
+        return formatOptions.supportsDynamicUpdate()
                 && ((flags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) == FormatSpec.FLAG_IS_DELETED);
     }
 
@@ -546,7 +546,7 @@ public final class BinaryDictIOUtils {
 
     static int getChildrenAddressSize(final int optionFlags,
             final FormatOptions formatOptions) {
-        if (formatOptions.mSupportsDynamicUpdate) return FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
+        if (formatOptions.supportsDynamicUpdate()) return FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
         switch (optionFlags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) {
             case FormatSpec.FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE:
                 return 1;
diff --git a/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
index 971b4ff9f..ff03190a3 100644
--- a/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
@@ -61,7 +61,7 @@ public final class DynamicBinaryDictIOUtils {
         final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
         final int originalPosition = dictBuffer.position();
         dictBuffer.position(ptNodeOriginAddress);
-        if (!formatOptions.mSupportsDynamicUpdate) {
+        if (!formatOptions.supportsDynamicUpdate()) {
             throw new RuntimeException("this file format does not support parent addresses");
         }
         final int flags = dictBuffer.readUnsignedByte();
@@ -102,7 +102,7 @@ public final class DynamicBinaryDictIOUtils {
             }
             if (!dictUpdater.readAndFollowForwardLink()) break;
             if (dictUpdater.getPosition() == FormatSpec.NO_FORWARD_LINK_ADDRESS) break;
-        } while (formatOptions.mSupportsDynamicUpdate);
+        } while (formatOptions.supportsDynamicUpdate());
         dictUpdater.setPosition(originalPosition);
     }
 
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index 846aacf11..20ddba836 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -40,12 +40,8 @@ public final class FormatSpec {
      * p | not used                                3 bits
      * t | each unigram and bigram entry has a time stamp?
      * i |                                         1 bit, 1 = yes, 0 = no : CONTAINS_TIMESTAMP_FLAG
-     * o | has bigrams ?                           1 bit, 1 = yes, 0 = no : CONTAINS_BIGRAMS_FLAG
-     * n | FRENCH_LIGATURE_PROCESSING_FLAG
-     * f | supports dynamic updates ?              1 bit, 1 = yes, 0 = no : SUPPORTS_DYNAMIC_UPDATE
-     * l | GERMAN_UMLAUT_PROCESSING_FLAG
-     * a |
-     * gs
+     * o |
+     * nflags
      *
      * h |
      * e | size of the file header, 4bytes
@@ -82,45 +78,36 @@ public final class FormatSpec {
      * s
      *
      * f |
-     * o | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header)
-     * r |     forward link address, 3byte
-     * w | 1 byte = bbbbbbbb match
-     * a |   case 1xxxxxxx => -((xxxxxxx << 16) + (next byte << 8) + next byte)
-     * r |   otherwise => (xxxxxxx << 16) + (next byte << 8) + next byte
-     * d |
-     * linkaddress
+     * o | forward link address, 3byte
+     * r | 1 byte = bbbbbbbb match
+     * w |   case 1xxxxxxx => -((xxxxxxx << 16) + (next byte << 8) + next byte)
+     * a |   otherwise => (xxxxxxx << 16) + (next byte << 8) + next byte
+     * r |
+     * dlinkaddress
      */
 
     /* Node (FusionDictionary.PtNode) layout is as follows:
-     *   | IF !SUPPORTS_DYNAMIC_UPDATE
-     *   |   addressType                    xx               : mask with MASK_CHILDREN_ADDRESS_TYPE
-     *   |                          2 bits, 00 = no children : FLAG_CHILDREN_ADDRESS_TYPE_NOADDRESS
-     * f |                                  01 = 1 byte      : FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE
-     * l |                                  10 = 2 bytes     : FLAG_CHILDREN_ADDRESS_TYPE_TWOBYTES
-     * a |                                  11 = 3 bytes     : FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
-     * g | ELSE
-     * s |   is moved ?             2 bits, 11 = no          : FLAG_IS_NOT_MOVED
-     *   |                            This must be the same as FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
-     *   |                                  01 = yes         : FLAG_IS_MOVED
-     *   |                        the new address is stored in the same place as the parent address
-     *   |   is deleted?                    10 = yes         : FLAG_IS_DELETED
-     *   | has several chars ?         1 bit, 1 = yes, 0 = no   : FLAG_HAS_MULTIPLE_CHARS
-     *   | has a terminal ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_TERMINAL
-     *   | has shortcut targets ?      1 bit, 1 = yes, 0 = no   : FLAG_HAS_SHORTCUT_TARGETS
+     *   | is moved ?             2 bits, 11 = no          : FLAG_IS_NOT_MOVED
+     *   |                          This must be the same as FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
+     *   |                                01 = yes         : FLAG_IS_MOVED
+     * f |                      the new address is stored in the same place as the parent address
+     * l | is deleted?                    10 = yes         : FLAG_IS_DELETED
+     * a | has several chars ?         1 bit, 1 = yes, 0 = no   : FLAG_HAS_MULTIPLE_CHARS
+     * g | has a terminal ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_TERMINAL
+     * s | has shortcut targets ?      1 bit, 1 = yes, 0 = no   : FLAG_HAS_SHORTCUT_TARGETS
      *   | has bigrams ?               1 bit, 1 = yes, 0 = no   : FLAG_HAS_BIGRAMS
      *   | is not a word ?             1 bit, 1 = yes, 0 = no   : FLAG_IS_NOT_A_WORD
      *   | is blacklisted ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_BLACKLISTED
      *
      * p |
-     * a | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header)
-     * r |     parent address, 3byte
-     * e | 1 byte = bbbbbbbb match
-     * n |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
-     * t |   otherwise => (bbbbbbbb << 16) + (next byte << 8) + next byte
-     * a | This address is relative to the head of the PtNode.
-     * d | If the node doesn't have a parent, this field is set to 0.
+     * a | parent address, 3byte
+     * r | 1 byte = bbbbbbbb match
+     * e |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
+     * n |   otherwise => (bbbbbbbb << 16) + (next byte << 8) + next byte
+     * t | This address is relative to the head of the PtNode.
+     * a | If the node doesn't have a parent, this field is set to 0.
      * d |
-     * ress
+     * dress
      *
      * c | IF FLAG_HAS_MULTIPLE_CHARS
      * h |   char, char, char, char    n * (1 or 3 bytes) : use PtNodeInfo for i/o helpers
@@ -134,23 +121,16 @@ public final class FormatSpec {
      * e |   frequency                 1 byte
      * q |
      *
-     * c | IF SUPPORTS_DYNAMIC_UPDATE
-     * h |   children address, 3 bytes
-     * i |   1 byte = bbbbbbbb match
-     * l |     case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
-     * d |     otherwise => (bbbbbbbb<<16) + (next byte << 8) + next byte
-     * r |   if this node doesn't have children, this field is set to 0.
-     * e |     (see BinaryDictEncoderUtils#writeVariableSignedAddress)
-     * n | ELSIF 00 = FLAG_CHILDREN_ADDRESS_TYPE_NOADDRESS == addressType
-     * a |   // nothing
-     * d | ELSIF 01 = FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE == addressType
-     * d |   children address, 1 byte
-     * r | ELSIF 10 = FLAG_CHILDREN_ADDRESS_TYPE_TWOBYTES == addressType
-     * e |   children address, 2 bytes
-     * s | ELSE // 11 = FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES = addressType
-     * s |   children address, 3 bytes
-     *   | END
-     *   | This address is relative to the position of this field.
+     * c |
+     * h | children address, 3 bytes
+     * i | 1 byte = bbbbbbbb match
+     * l |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
+     * d |   otherwise => (bbbbbbbb<<16) + (next byte << 8) + next byte
+     * r | if this node doesn't have children, this field is set to 0.
+     * e |   (see BinaryDictEncoderUtils#writeVariableSignedAddress)
+     * n | This address is relative to the position of this field.
+     * a |
+     * ddress
      *
      *   | IF FLAG_IS_TERMINAL && FLAG_HAS_SHORTCUT_TARGETS
      *   | shortcut string list
@@ -214,11 +194,7 @@ public final class FormatSpec {
     static final int MAXIMUM_SUPPORTED_VERSION = VERSION4;
 
     // These options need to be the same numeric values as the one in the native reading code.
-    static final int GERMAN_UMLAUT_PROCESSING_FLAG = 0x1;
     // TODO: Make the native reading code read this variable.
-    static final int SUPPORTS_DYNAMIC_UPDATE = 0x2;
-    static final int FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
-    static final int CONTAINS_BIGRAMS_FLAG = 0x8;
     static final int CONTAINS_TIMESTAMP_FLAG = 0x10;
 
     // TODO: Make this value adaptative to content data, store it in the header, and
@@ -339,30 +315,23 @@ public final class FormatSpec {
      */
     public static final class FormatOptions {
         public final int mVersion;
-        public final boolean mSupportsDynamicUpdate;
         public final boolean mHasTerminalId;
         public final boolean mHasTimestamp;
-        @UsedForTesting
-        public FormatOptions(final int version) {
-            this(version, false);
-        }
 
         @UsedForTesting
-        public FormatOptions(final int version, final boolean supportsDynamicUpdate) {
-            this(version, supportsDynamicUpdate, false /* hasTimestamp */);
+        public FormatOptions(final int version) {
+            this(version, false /* hasTimestamp */);
         }
 
-        public FormatOptions(final int version, final boolean supportsDynamicUpdate,
-                final boolean hasTimestamp) {
+        public FormatOptions(final int version, final boolean hasTimestamp) {
             mVersion = version;
-            if (version < FIRST_VERSION_WITH_DYNAMIC_UPDATE && supportsDynamicUpdate) {
-                throw new RuntimeException("Dynamic updates are only supported with versions "
-                        + FIRST_VERSION_WITH_DYNAMIC_UPDATE + " and ulterior.");
-            }
-            mSupportsDynamicUpdate = supportsDynamicUpdate;
             mHasTerminalId = (version >= FIRST_VERSION_WITH_TERMINAL_ID);
             mHasTimestamp = hasTimestamp;
         }
+
+        public boolean supportsDynamicUpdate() {
+            return mVersion >= FIRST_VERSION_WITH_DYNAMIC_UPDATE;
+        }
     }
 
     /**
@@ -374,7 +343,6 @@ public final class FormatSpec {
         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 HAS_HISTORICAL_INFO_ATTRIBUTE = "HAS_HISTORICAL_INFO";
         public static final String ATTRIBUTE_VALUE_TRUE = "1";
diff --git a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
index 3bb218bea..fdf2ae7b5 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
@@ -303,14 +303,9 @@ public final class FusionDictionary implements Iterable<Word> {
      * Options global to the dictionary.
      */
     public static final class DictionaryOptions {
-        public final boolean mGermanUmlautProcessing;
-        public final boolean mFrenchLigatureProcessing;
         public final HashMap<String, String> mAttributes;
-        public DictionaryOptions(final HashMap<String, String> attributes,
-                final boolean germanUmlautProcessing, final boolean frenchLigatureProcessing) {
+        public DictionaryOptions(final HashMap<String, String> attributes) {
             mAttributes = attributes;
-            mGermanUmlautProcessing = germanUmlautProcessing;
-            mFrenchLigatureProcessing = frenchLigatureProcessing;
         }
         @Override
         public String toString() { // Convenience method
@@ -339,14 +334,6 @@ public final class FusionDictionary implements Iterable<Word> {
                 }
                 s.append("\n");
             }
-            if (mGermanUmlautProcessing) {
-                s.append(indent);
-                s.append("Needs German umlaut processing\n");
-            }
-            if (mFrenchLigatureProcessing) {
-                s.append(indent);
-                s.append("Needs French ligature processing\n");
-            }
             return s.toString();
         }
     }
@@ -701,138 +688,6 @@ public final class FusionDictionary implements Iterable<Word> {
     }
 
     /**
-     * Recursively count the number of nodes in a given branch of the trie.
-     *
-     * @param nodeArray the node array to count.
-     * @return the number of nodes in this branch.
-     */
-    public static int countNodeArrays(final PtNodeArray nodeArray) {
-        int size = 1;
-        for (int i = nodeArray.mData.size() - 1; i >= 0; --i) {
-            PtNode ptNode = nodeArray.mData.get(i);
-            if (null != ptNode.mChildren)
-                size += countNodeArrays(ptNode.mChildren);
-        }
-        return size;
-    }
-
-    // Recursively find out whether there are any bigrams.
-    // This can be pretty expensive especially if there aren't any (we return as soon
-    // as we find one, so it's much cheaper if there are bigrams)
-    private static boolean hasBigramsInternal(final PtNodeArray nodeArray) {
-        if (null == nodeArray) return false;
-        for (int i = nodeArray.mData.size() - 1; i >= 0; --i) {
-            PtNode ptNode = nodeArray.mData.get(i);
-            if (null != ptNode.mBigrams) return true;
-            if (hasBigramsInternal(ptNode.mChildren)) return true;
-        }
-        return false;
-    }
-
-    /**
-     * Finds out whether there are any bigrams in this dictionary.
-     *
-     * @return true if there is any bigram, false otherwise.
-     */
-    // TODO: this is expensive especially for large dictionaries without any bigram.
-    // The up side is, this is always accurate and correct and uses no memory. We should
-    // find a more efficient way of doing this, without compromising too much on memory
-    // and ease of use.
-    public boolean hasBigrams() {
-        return hasBigramsInternal(mRootNodeArray);
-    }
-
-    // Historically, the tails of the words were going to be merged to save space.
-    // However, that would prevent the code to search for a specific address in log(n)
-    // time so this was abandoned.
-    // The code is still of interest as it does add some compression to any dictionary
-    // that has no need for attributes. Implementations that does not read attributes should be
-    // able to read a dictionary with merged tails.
-    // Also, the following code does support frequencies, as in, it will only merges
-    // tails that share the same frequency. Though it would result in the above loss of
-    // performance while searching by address, it is still technically possible to merge
-    // tails that contain attributes, but this code does not take that into account - it does
-    // not compare attributes and will merge terminals with different attributes regardless.
-    public void mergeTails() {
-        MakedictLog.i("Do not merge tails");
-        return;
-
-//        MakedictLog.i("Merging PtNodes. Number of PtNodes : " + countPtNodes(root));
-//        MakedictLog.i("Number of PtNodes : " + countPtNodes(root));
-//
-//        final HashMap<String, ArrayList<PtNodeArray>> repository =
-//                  new HashMap<String, ArrayList<PtNodeArray>>();
-//        mergeTailsInner(repository, root);
-//
-//        MakedictLog.i("Number of different pseudohashes : " + repository.size());
-//        int size = 0;
-//        for (ArrayList<PtNodeArray> a : repository.values()) {
-//            size += a.size();
-//        }
-//        MakedictLog.i("Number of nodes after merge : " + (1 + size));
-//        MakedictLog.i("Recursively seen nodes : " + countNodes(root));
-    }
-
-    // The following methods are used by the deactivated mergeTails()
-//   private static boolean isEqual(PtNodeArray a, PtNodeArray b) {
-//       if (null == a && null == b) return true;
-//       if (null == a || null == b) return false;
-//       if (a.data.size() != b.data.size()) return false;
-//       final int size = a.data.size();
-//       for (int i = size - 1; i >= 0; --i) {
-//           PtNode aPtNode = a.data.get(i);
-//           PtNode bPtNode = b.data.get(i);
-//           if (aPtNode.frequency != bPtNode.frequency) return false;
-//           if (aPtNode.alternates == null && bPtNode.alternates != null) return false;
-//           if (aPtNode.alternates != null && !aPtNode.equals(bPtNode.alternates)) return false;
-//           if (!Arrays.equals(aPtNode.chars, bPtNode.chars)) return false;
-//           if (!isEqual(aPtNode.children, bPtNode.children)) return false;
-//       }
-//       return true;
-//   }
-
-//   static private HashMap<String, ArrayList<PtNodeArray>> mergeTailsInner(
-//           final HashMap<String, ArrayList<PtNodeArray>> map, final PtNodeArray nodeArray) {
-//       final ArrayList<PtNode> branches = nodeArray.data;
-//       final int nodeSize = branches.size();
-//       for (int i = 0; i < nodeSize; ++i) {
-//           PtNode ptNode = branches.get(i);
-//           if (null != ptNode.children) {
-//               String pseudoHash = getPseudoHash(ptNode.children);
-//               ArrayList<PtNodeArray> similarList = map.get(pseudoHash);
-//               if (null == similarList) {
-//                   similarList = new ArrayList<PtNodeArray>();
-//                   map.put(pseudoHash, similarList);
-//               }
-//               boolean merged = false;
-//               for (PtNodeArray similar : similarList) {
-//                   if (isEqual(ptNode.children, similar)) {
-//                       ptNode.children = similar;
-//                       merged = true;
-//                       break;
-//                   }
-//               }
-//               if (!merged) {
-//                   similarList.add(ptNode.children);
-//               }
-//               mergeTailsInner(map, ptNode.children);
-//           }
-//       }
-//       return map;
-//   }
-
-//  private static String getPseudoHash(final PtNodeArray nodeArray) {
-//      StringBuilder s = new StringBuilder();
-//      for (PtNode ptNode : nodeArray.data) {
-//          s.append(ptNode.frequency);
-//          for (int ch : ptNode.chars) {
-//              s.append(Character.toChars(ch));
-//          }
-//      }
-//      return s.toString();
-//  }
-
-    /**
      * Iterator to walk through a dictionary.
      *
      * This is purely for convenience.
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
index 5da34534e..92eb861d6 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
@@ -169,7 +169,7 @@ public class Ver3DictEncoder implements DictEncoder {
 
     private void writeChildrenPosition(final PtNode ptNode, final FormatOptions formatOptions) {
         final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             mPosition += BinaryDictEncoderUtils.writeSignedChildrenPosition(mBuffer, mPosition,
                     childrenPos);
         } else {
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
index 07522b54b..3be62f066 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
@@ -183,14 +183,11 @@ public class Ver4DictDecoder extends AbstractDictDecoder {
      * An auxiliary class for reading bigrams.
      */
     protected static class BigramContentReader extends SparseTableContentReader {
-        private final boolean mHasTimestamp;
-
         public BigramContentReader(final String name, final File baseDir,
                 final DictionaryBufferFactory factory, final boolean hasTimestamp) {
             super(name + FormatSpec.BIGRAM_FILE_EXTENSION,
                     FormatSpec.BIGRAM_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
                     getContentFilenames(name, hasTimestamp), getContentIds(hasTimestamp), factory);
-            mHasTimestamp = hasTimestamp;
         }
 
         // TODO: Consolidate this method and BigramContentWriter.getContentFilenames.
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
index 1a245b6db..8b80ebe63 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
@@ -365,7 +365,7 @@ public class Ver4DictEncoder implements DictEncoder {
 
     private void writeChildrenPosition(PtNode ptNode, FormatOptions formatOptions) {
         final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             mTriePos += BinaryDictEncoderUtils.writeSignedChildrenPosition(mTrieBuf,
                     mTriePos, childrenPos);
         } else {
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
index 91d9cf345..c46bc36bb 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
@@ -54,8 +54,6 @@ public class Ver4DictUpdater extends Ver4DictDecoder implements DictUpdater {
     }
 
     private static class BigramContentUpdater extends SparseTableContentUpdater {
-        private final boolean mHasTimestamp;
-
         public BigramContentUpdater(final String name, final File baseDir,
                 final boolean hasTimestamp) {
             super(name + FormatSpec.BIGRAM_FILE_EXTENSION,
@@ -63,7 +61,6 @@ public class Ver4DictUpdater extends Ver4DictDecoder implements DictUpdater {
                     BigramContentReader.getContentFilenames(name, hasTimestamp),
                     BigramContentReader.getContentIds(hasTimestamp),
                     new DictionaryBufferFromWritableByteBufferFactory());
-            mHasTimestamp = hasTimestamp;
         }
 
         public void insertBigramEntries(final int terminalId, final int frequency,
diff --git a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
index 296733fad..9b573b4b8 100644
--- a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
+++ b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
@@ -95,8 +95,6 @@ public abstract class DecayingExpandableBinaryDictionaryBase extends ExpandableB
     @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);
         attributeMap.put(FormatSpec.FileHeader.HAS_HISTORICAL_INFO_ATTRIBUTE,
diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
index a2c3ed44d..db628fe18 100644
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
@@ -95,8 +95,7 @@ public final class UserHistoryDictIOUtils {
     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, false,
-                        false));
+                new FusionDictionary.DictionaryOptions(options));
         int profTotal = 0;
         for (final String word1 : bigrams.keySet()) {
             final HashMap<String, Byte> word1Bigrams = bigrams.getBigrams(word1);