Introduce DynamicDictionaryWriter for dynamic dictionary. (87a72f50) · Commits · e / os / android_packages_inputmethods_LatinIME

java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java

+5 −4

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@ import android.util.Log;
		import com.android.inputmethod.annotations.UsedForTesting;
		import com.android.inputmethod.keyboard.ProximityInfo;
		import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
		import com.android.inputmethod.latin.personalization.DynamicPersonalizationDictionaryWriter;
		import com.android.inputmethod.latin.utils.CollectionUtils;

		import java.io.File;
		@@ -118,10 +119,9 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
		}

		private static AbstractDictionaryWriter getDictionaryWriter(final Context context,
		final String dictType, final boolean isUpdatable) {
		if (isUpdatable) {
		// TODO: Employ dynamically updatable DictionaryWriter.
		return new DictionaryWriter(context, dictType);
		final String dictType, final boolean isDynamicPersonalizationDictionary) {
		if (isDynamicPersonalizationDictionary) {
		return new DynamicPersonalizationDictionaryWriter(context, dictType);
		} else {
		return new DictionaryWriter(context, dictType);
		}
		@@ -145,6 +145,7 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
		mIsUpdatable = isUpdatable;
		mBinaryDictionary = null;
		mSharedDictionaryController = getSharedDictionaryController(filename);
		// Currently, only dynamic personalization dictionary is updatable.
		mDictionaryWriter = getDictionaryWriter(context, dictType, isUpdatable);
		}

java/src/com/android/inputmethod/latin/ExpandableDictionary.java

+3 −3

Original line number	Diff line number	Diff line
		@@ -327,7 +327,7 @@ public class ExpandableDictionary extends Dictionary {
		return (node == null) ? false : !node.mShortcutOnly;
		}

		protected boolean removeBigram(final String word1, final String word2) {
		public boolean removeBigram(final String word1, final String word2) {
		// Refer to addOrSetBigram() about word1.toLowerCase()
		final Node firstWord = searchWord(mRoots, word1.toLowerCase(), 0, null);
		final Node secondWord = searchWord(mRoots, word2, 0, null);
		@@ -359,7 +359,7 @@ public class ExpandableDictionary extends Dictionary {
		return (node == null) ? -1 : node.mFrequency;
		}

		protected NextWord getBigramWord(final String word1, final String word2) {
		public NextWord getBigramWord(final String word1, final String word2) {
		// Refer to addOrSetBigram() about word1.toLowerCase()
		final Node firstWord = searchWord(mRoots, word1.toLowerCase(), 0, null);
		final Node secondWord = searchWord(mRoots, word2, 0, null);
		@@ -700,7 +700,7 @@ public class ExpandableDictionary extends Dictionary {
		return null;
		}

		protected void clearDictionary() {
		public void clearDictionary() {
		mRoots = new NodeArray();
		}

java/src/com/android/inputmethod/latin/personalization/DynamicPersonalizationDictionaryWriter.java

0 → 100644

+159 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2013 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.content.Context;

		import com.android.inputmethod.keyboard.ProximityInfo;
		import com.android.inputmethod.latin.AbstractDictionaryWriter;
		import com.android.inputmethod.latin.ExpandableDictionary;
		import com.android.inputmethod.latin.WordComposer;
		import com.android.inputmethod.latin.ExpandableDictionary.NextWord;
		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.UnsupportedFormatException;
		import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils;
		import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.BigramDictionaryInterface;
		import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils;
		import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils.ForgettingCurveParams;

		import java.io.IOException;
		import java.util.ArrayList;

		// Currently this class is used to implement dynamic prodiction dictionary.
		// TODO: Move to native code.
		public class DynamicPersonalizationDictionaryWriter extends AbstractDictionaryWriter {
		private static final String TAG = DynamicPersonalizationDictionaryWriter.class.getSimpleName();
		/** Maximum number of pairs. Pruning will start when databases goes above this number. */
		public static final int MAX_HISTORY_BIGRAMS = 10000;

		/** Any pair being typed or picked */
		private static final int FREQUENCY_FOR_TYPED = 2;

		private static final int BINARY_DICT_VERSION = 3;
		private static final FormatSpec.FormatOptions FORMAT_OPTIONS =
		new FormatSpec.FormatOptions(BINARY_DICT_VERSION, true /* supportsDynamicUpdate */);

		private final UserHistoryDictionaryBigramList mBigramList =
		new UserHistoryDictionaryBigramList();
		private final ExpandableDictionary mExpandableDictionary;

		public DynamicPersonalizationDictionaryWriter(final Context context, final String dictType) {
		super(context, dictType);
		mExpandableDictionary = new ExpandableDictionary(context, dictType);
		}

		@Override
		public void clear() {
		mBigramList.evictAll();
		mExpandableDictionary.clearDictionary();
		}

		/**
		* Adds a word unigram to the fusion dictionary. Call updateBinaryDictionary when all changes
		* are done to update the binary dictionary.
		*/
		@Override
		public void addUnigramWord(final String word, final String shortcutTarget, final int frequency,
		final boolean isNotAWord) {
		mExpandableDictionary.addWord(word, shortcutTarget, frequency);
		mBigramList.addBigram(null, word, (byte)frequency);
		}

		@Override
		public void addBigramWords(final String word0, final String word1, final int frequency,
		final boolean isValid, final long lastModifiedTime) {
		if (lastModifiedTime > 0) {
		mExpandableDictionary.setBigramAndGetFrequency(word0, word1,
		new ForgettingCurveParams(frequency, System.currentTimeMillis(),
		lastModifiedTime));
		mBigramList.addBigram(word0, word1, (byte)frequency);
		} else {
		mExpandableDictionary.setBigramAndGetFrequency(word0, word1,
		new ForgettingCurveParams(isValid));
		mBigramList.addBigram(word0, word1, (byte)frequency);
		}
		}

		@Override
		public void removeBigramWords(final String word0, final String word1) {
		if (mBigramList.removeBigram(word0, word1)) {
		mExpandableDictionary.removeBigram(word0, word1);
		}
		}

		@Override
		protected void writeDictionary(final DictEncoder dictEncoder)
		throws IOException, UnsupportedFormatException {
		UserHistoryDictIOUtils.writeDictionary(dictEncoder,
		new FrequencyProvider(mBigramList, mExpandableDictionary), mBigramList,
		FORMAT_OPTIONS);
		}

		private static class FrequencyProvider implements BigramDictionaryInterface {
		final private UserHistoryDictionaryBigramList mBigramList;
		final private ExpandableDictionary mExpandableDictionary;

		public FrequencyProvider(final UserHistoryDictionaryBigramList bigramList,
		final ExpandableDictionary expandableDictionary) {
		mBigramList = bigramList;
		mExpandableDictionary = expandableDictionary;
		}
		@Override
		public int getFrequency(final String word0, final String word1) {
		final int freq;
		if (word0 == null) { // unigram
		freq = FREQUENCY_FOR_TYPED;
		} else { // bigram
		final NextWord nw = mExpandableDictionary.getBigramWord(word0, word1);
		if (nw != null) {
		final ForgettingCurveParams forgettingCurveParams = nw.getFcParams();
		final byte prevFc = mBigramList.getBigrams(word0).get(word1);
		final byte fc = forgettingCurveParams.getFc();
		final boolean isValid = forgettingCurveParams.isValid();
		if (prevFc > 0 && prevFc == fc) {
		freq = fc & 0xFF;
		} else if (UserHistoryForgettingCurveUtils.
		needsToSave(fc, isValid, mBigramList.size() <= MAX_HISTORY_BIGRAMS)) {
		freq = fc & 0xFF;
		} else {
		// Delete this entry
		freq = -1;
		}
		} else {
		// Delete this entry
		freq = -1;
		}
		}
		return freq;
		}
		}

		@Override
		public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
		final String prevWord, final ProximityInfo proximityInfo,
		boolean blockOffensiveWords) {
		return mExpandableDictionary.getSuggestions(composer, prevWord, proximityInfo,
		blockOffensiveWords);
		}

		@Override
		public boolean isValidWord(final String word) {
		return mExpandableDictionary.isValidWord(word);
		}
		}