add UserHistoryDictIOUtils.

Change-Id: I8a70e43b23f65b5fd5f0ee0b30a94ad8f5ef8a8a

2 files changed, 195 insertions, 11 deletions

diff --git a/java/src/com/android/inputmethod/latin/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/UserHistoryDictIOUtils.java
new file mode 100644
index 000000000..2963e3771
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/UserHistoryDictIOUtils.java
@@ -0,0 +1,193 @@
+/*
+ * 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;
+
+import android.util.Log;
+
+import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
+import com.android.inputmethod.latin.makedict.BinaryDictInputOutput.FusionDictionaryBufferInterface;
+import com.android.inputmethod.latin.makedict.FusionDictionary;
+import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
+import com.android.inputmethod.latin.makedict.PendingAttribute;
+import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Reads and writes Binary files for a UserHistoryDictionary.
+ *
+ * All the methods in this class are static.
+ */
+public class UserHistoryDictIOUtils {
+    private static final String TAG = UserHistoryDictIOUtils.class.getSimpleName();
+    private static final boolean DEBUG = false;
+
+    public interface OnAddWordListener {
+        public void setUnigram(final String word, final String shortcutTarget, final int frequency);
+        public void setBigram(final String word1, final String word2, final int frequency);
+    }
+
+    public interface BigramDictionaryInterface {
+        public int getFrequency(final String word1, final String word2);
+    }
+
+    public static final class ByteArrayWrapper implements FusionDictionaryBufferInterface {
+        private byte[] mBuffer;
+        private int mPosition;
+
+        ByteArrayWrapper(final byte[] buffer) {
+            mBuffer = buffer;
+            mPosition = 0;
+        }
+
+        @Override
+        public int readUnsignedByte() {
+            return ((int)mBuffer[mPosition++]) & 0xFF;
+        }
+
+        @Override
+        public int readUnsignedShort() {
+            final int retval = readUnsignedByte();
+            return (retval << 8) + readUnsignedByte();
+        }
+
+        @Override
+        public int readUnsignedInt24() {
+            final int retval = readUnsignedShort();
+            return (retval << 8) + readUnsignedByte();
+        }
+
+        @Override
+        public int readInt() {
+            final int retval = readUnsignedShort();
+            return (retval << 16) + readUnsignedShort();
+        }
+
+        @Override
+        public int position() {
+            return mPosition;
+        }
+
+        @Override
+        public void position(int position) {
+            mPosition = position;
+        }
+    }
+
+    /**
+     * Writes dictionary to file.
+     */
+    public static void writeDictionaryBinary(final OutputStream destination,
+            final BigramDictionaryInterface dict, final UserHistoryDictionaryBigramList bigrams,
+            final int version) {
+
+        final FusionDictionary fusionDict = constructFusionDictionary(dict, bigrams);
+
+        try {
+            BinaryDictInputOutput.writeDictionaryBinary(destination, fusionDict, version);
+        } catch (IOException e) {
+            Log.e(TAG, "IO exception while writing file: " + e);
+        } catch (UnsupportedFormatException e) {
+            Log.e(TAG, "Unsupported fomat: " + e);
+        }
+    }
+
+    /**
+     * Constructs a new FusionDictionary from BigramDictionaryInterface.
+     */
+    /* packages for test */ static FusionDictionary constructFusionDictionary(
+            final BigramDictionaryInterface dict, final UserHistoryDictionaryBigramList bigrams) {
+
+        final FusionDictionary fusionDict = new FusionDictionary(new Node(),
+                new FusionDictionary.DictionaryOptions(
+                        new HashMap<String,String>(), false, false));
+
+        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 (DEBUG) {
+                    if (word1 == null) {
+                        Log.d(TAG, "add unigram: " + word2 + "," + Integer.toString(freq));
+                    } else {
+                        Log.d(TAG, "add bigram: " + word1
+                                + "," + word2 + "," + Integer.toString(freq));
+                    }
+                }
+
+                if (word1 == null) { // unigram
+                    fusionDict.add(word2, freq, null);
+                } else { // bigram
+                    fusionDict.setBigram(word1, word2, freq);
+                }
+                bigrams.updateBigram(word1, word2, (byte)freq);
+            }
+        }
+
+        return fusionDict;
+    }
+
+    /**
+     * Reads dictionary from file.
+     */
+    public static void readDictionaryBinary(final FusionDictionaryBufferInterface buffer,
+            final OnAddWordListener dict) {
+        final Map<Integer, String> unigrams = CollectionUtils.newTreeMap();
+        final Map<Integer, Integer> frequencies = CollectionUtils.newTreeMap();
+        final Map<Integer, ArrayList<PendingAttribute>> bigrams = CollectionUtils.newTreeMap();
+
+        try {
+            BinaryDictInputOutput.readUnigramsAndBigramsBinary(buffer, unigrams, frequencies,
+                    bigrams);
+            addWordsFromWordMap(unigrams, frequencies, bigrams, dict);
+        } catch (IOException e) {
+            Log.e(TAG, "IO exception while reading file: " + e);
+        } catch (UnsupportedFormatException e) {
+            Log.e(TAG, "Unsupported format: " + e);
+        }
+    }
+
+    /**
+     * Adds all unigrams and bigrams in maps to OnAddWordListener.
+     */
+    /* package for test */ static void addWordsFromWordMap(final Map<Integer, String> unigrams,
+            final Map<Integer, Integer> frequencies,
+            final Map<Integer, ArrayList<PendingAttribute>> bigrams, final OnAddWordListener to) {
+
+        for (Map.Entry<Integer, String> entry : unigrams.entrySet()) {
+            final String word1 = entry.getValue();
+            final int unigramFrequency = frequencies.get(entry.getKey());
+            to.setUnigram(word1, null, unigramFrequency);
+
+            final ArrayList<PendingAttribute> attrList = bigrams.get(entry.getKey());
+
+            if (attrList != null) {
+                for (final PendingAttribute attr : attrList) {
+                    to.setBigram(word1, unigrams.get(attr.mAddress),
+                            BinaryDictInputOutput.reconstructBigramFrequency(unigramFrequency,
+                                    attr.mFrequency));
+                }
+            }
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
index 9f7f41331..bb7d1b2d2 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictInputOutput.java
@@ -189,7 +189,7 @@ public class BinaryDictInputOutput {
     // suspicion that a bug might be causing an infinite loop.
     private static final int MAX_PASSES = 24;
 
-    private interface FusionDictionaryBufferInterface {
+    public interface FusionDictionaryBufferInterface {
         public int readUnsignedByte();
         public int readUnsignedShort();
         public int readUnsignedInt24();
@@ -234,7 +234,6 @@ public class BinaryDictInputOutput {
         @Override
         public void position(int newPos) {
             mBuffer.position(newPos);
-            return;
         }
     }
 
@@ -1393,7 +1392,6 @@ public class BinaryDictInputOutput {
             final FusionDictionaryBufferInterface buffer, final int headerSize,
             final Map<Integer, String> words, final Map<Integer, Integer> frequencies,
             final Map<Integer, ArrayList<PendingAttribute>> bigrams) {
-
         int[] pushedChars = new int[MAX_WORD_LENGTH + 1];
 
         Stack<Position> stack = new Stack<Position>();
@@ -1443,8 +1441,6 @@ public class BinaryDictInputOutput {
                 stack.push(childrenPos);
             }
         }
-
-        return;
     }
 
     /**
@@ -1462,7 +1458,6 @@ public class BinaryDictInputOutput {
             final Map<Integer, String> words, final Map<Integer, Integer> frequencies,
             final Map<Integer, ArrayList<PendingAttribute>> bigrams) throws IOException,
             UnsupportedFormatException {
-
         // Read header
         final int version = checkFormatVersion(buffer);
         final int optionsFlags = buffer.readUnsignedShort();
@@ -1507,10 +1502,8 @@ public class BinaryDictInputOutput {
      * @throws UnsupportedFormatException
      */
     private static int readHeader(final FusionDictionaryBufferInterface buffer,
-            final HashMap<String, String> options,
-            final int version)
+            final HashMap<String, String> options, final int version)
             throws IOException, UnsupportedFormatException {
-
         final int headerSize;
         if (version < FIRST_VERSION_WITH_HEADER_SIZE) {
             headerSize = buffer.position();
@@ -1523,7 +1516,6 @@ public class BinaryDictInputOutput {
         if (headerSize < 0) {
             throw new UnsupportedFormatException("header size can't be negative.");
         }
-
         return headerSize;
     }
 
@@ -1561,7 +1553,6 @@ public class BinaryDictInputOutput {
     public static FusionDictionary readDictionaryBinary(
             final FusionDictionaryBufferInterface buffer, final FusionDictionary dict)
                     throws IOException, UnsupportedFormatException {
-
         // clear cache
         wordCache.clear();