227 lines
9.4 KiB
Java
227 lines
9.4 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.latin;
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import android.text.TextUtils;
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import android.util.SparseArray;
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import com.android.inputmethod.keyboard.ProximityInfo;
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import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Locale;
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/**
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* Implements a static, compacted, binary dictionary of standard words.
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*/
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public final class BinaryDictionary extends Dictionary {
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private static final String TAG = BinaryDictionary.class.getSimpleName();
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// Must be equal to MAX_WORD_LENGTH in native/jni/src/defines.h
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private static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
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// Must be equal to MAX_RESULTS in native/jni/src/defines.h
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private static final int MAX_RESULTS = 18;
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private long mNativeDict;
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private final Locale mLocale;
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private final int[] mInputCodePoints = new int[MAX_WORD_LENGTH];
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private final int[] mOutputCodePoints = new int[MAX_WORD_LENGTH * MAX_RESULTS];
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private final int[] mSpaceIndices = new int[MAX_RESULTS];
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private final int[] mOutputScores = new int[MAX_RESULTS];
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private final int[] mOutputTypes = new int[MAX_RESULTS];
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private final boolean mUseFullEditDistance;
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private final SparseArray<DicTraverseSession> mDicTraverseSessions =
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CollectionUtils.newSparseArray();
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// TODO: There should be a way to remove used DicTraverseSession objects from
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// {@code mDicTraverseSessions}.
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private DicTraverseSession getTraverseSession(final int traverseSessionId) {
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synchronized(mDicTraverseSessions) {
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DicTraverseSession traverseSession = mDicTraverseSessions.get(traverseSessionId);
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if (traverseSession == null) {
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traverseSession = mDicTraverseSessions.get(traverseSessionId);
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if (traverseSession == null) {
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traverseSession = new DicTraverseSession(mLocale, mNativeDict);
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mDicTraverseSessions.put(traverseSessionId, traverseSession);
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}
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}
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return traverseSession;
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}
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}
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/**
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* Constructor for the binary dictionary. This is supposed to be called from the
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* dictionary factory.
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* @param filename the name of the file to read through native code.
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* @param offset the offset of the dictionary data within the file.
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* @param length the length of the binary data.
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* @param useFullEditDistance whether to use the full edit distance in suggestions
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* @param dictType the dictionary type, as a human-readable string
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*/
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public BinaryDictionary(final String filename, final long offset, final long length,
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final boolean useFullEditDistance, final Locale locale, final String dictType) {
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super(dictType);
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mLocale = locale;
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mUseFullEditDistance = useFullEditDistance;
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loadDictionary(filename, offset, length);
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}
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static {
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JniUtils.loadNativeLibrary();
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}
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private static native long openNative(String sourceDir, long dictOffset, long dictSize);
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private static native void closeNative(long dict);
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private static native int getProbabilityNative(long dict, int[] word);
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private static native boolean isValidBigramNative(long dict, int[] word1, int[] word2);
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private static native int getSuggestionsNative(long dict, long proximityInfo,
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long traverseSession, int[] xCoordinates, int[] yCoordinates, int[] times,
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int[] pointerIds, int[] inputCodePoints, int inputSize, int commitPoint,
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boolean isGesture, int[] prevWordCodePointArray, boolean useFullEditDistance,
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int[] outputCodePoints, int[] outputScores, int[] outputIndices, int[] outputTypes);
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private static native float calcNormalizedScoreNative(int[] before, int[] after, int score);
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private static native int editDistanceNative(int[] before, int[] after);
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// TODO: Move native dict into session
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private final void loadDictionary(final String path, final long startOffset,
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final long length) {
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mNativeDict = openNative(path, startOffset, length);
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}
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@Override
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public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
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final String prevWord, final ProximityInfo proximityInfo) {
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return getSuggestionsWithSessionId(composer, prevWord, proximityInfo, 0);
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}
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@Override
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public ArrayList<SuggestedWordInfo> getSuggestionsWithSessionId(final WordComposer composer,
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final String prevWord, final ProximityInfo proximityInfo, int sessionId) {
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if (!isValidDictionary()) return null;
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Arrays.fill(mInputCodePoints, Constants.NOT_A_CODE);
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// TODO: toLowerCase in the native code
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final int[] prevWordCodePointArray = (null == prevWord)
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? null : StringUtils.toCodePointArray(prevWord);
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final int composerSize = composer.size();
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final boolean isGesture = composer.isBatchMode();
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if (composerSize <= 1 || !isGesture) {
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if (composerSize > MAX_WORD_LENGTH - 1) return null;
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for (int i = 0; i < composerSize; i++) {
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mInputCodePoints[i] = composer.getCodeAt(i);
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}
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}
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final InputPointers ips = composer.getInputPointers();
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final int inputSize = isGesture ? ips.getPointerSize() : composerSize;
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// proximityInfo and/or prevWordForBigrams may not be null.
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final int count = getSuggestionsNative(mNativeDict, proximityInfo.getNativeProximityInfo(),
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getTraverseSession(sessionId).getSession(), ips.getXCoordinates(),
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ips.getYCoordinates(), ips.getTimes(), ips.getPointerIds(), mInputCodePoints,
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inputSize, 0 /* commitPoint */, isGesture, prevWordCodePointArray,
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mUseFullEditDistance, mOutputCodePoints, mOutputScores, mSpaceIndices,
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mOutputTypes);
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final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
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for (int j = 0; j < count; ++j) {
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final int start = j * MAX_WORD_LENGTH;
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int len = 0;
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while (len < MAX_WORD_LENGTH && mOutputCodePoints[start + len] != 0) {
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++len;
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}
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if (len > 0) {
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final int score = SuggestedWordInfo.KIND_WHITELIST == mOutputTypes[j]
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? SuggestedWordInfo.MAX_SCORE : mOutputScores[j];
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suggestions.add(new SuggestedWordInfo(new String(mOutputCodePoints, start, len),
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score, mOutputTypes[j], mDictType));
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}
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}
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return suggestions;
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}
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public boolean isValidDictionary() {
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return mNativeDict != 0;
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}
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public static float calcNormalizedScore(final String before, final String after,
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final int score) {
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return calcNormalizedScoreNative(StringUtils.toCodePointArray(before),
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StringUtils.toCodePointArray(after), score);
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}
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public static int editDistance(final String before, final String after) {
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if (before == null || after == null) {
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throw new IllegalArgumentException();
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}
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return editDistanceNative(StringUtils.toCodePointArray(before),
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StringUtils.toCodePointArray(after));
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}
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@Override
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public boolean isValidWord(final String word) {
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return getFrequency(word) >= 0;
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}
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@Override
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public int getFrequency(final String word) {
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if (word == null) return -1;
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int[] codePoints = StringUtils.toCodePointArray(word);
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return getProbabilityNative(mNativeDict, codePoints);
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}
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// TODO: Add a batch process version (isValidBigramMultiple?) to avoid excessive numbers of jni
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// calls when checking for changes in an entire dictionary.
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public boolean isValidBigram(final String word1, final String word2) {
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if (TextUtils.isEmpty(word1) || TextUtils.isEmpty(word2)) return false;
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final int[] codePoints1 = StringUtils.toCodePointArray(word1);
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final int[] codePoints2 = StringUtils.toCodePointArray(word2);
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return isValidBigramNative(mNativeDict, codePoints1, codePoints2);
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}
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@Override
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public void close() {
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synchronized (mDicTraverseSessions) {
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final int sessionsSize = mDicTraverseSessions.size();
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for (int index = 0; index < sessionsSize; ++index) {
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final DicTraverseSession traverseSession = mDicTraverseSessions.valueAt(index);
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if (traverseSession != null) {
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traverseSession.close();
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}
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}
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}
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closeInternal();
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}
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private synchronized void closeInternal() {
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if (mNativeDict != 0) {
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closeNative(mNativeDict);
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mNativeDict = 0;
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}
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}
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@Override
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protected void finalize() throws Throwable {
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try {
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closeInternal();
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} finally {
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super.finalize();
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}
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}
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}
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