BinaryDictionary.java revision 03cb8f751a7f35e9159c724a2d25528b86287b57
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.inputmethod.latin; 18 19import android.text.TextUtils; 20import android.util.SparseArray; 21 22import com.android.inputmethod.annotations.UsedForTesting; 23import com.android.inputmethod.keyboard.ProximityInfo; 24import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo; 25import com.android.inputmethod.latin.settings.NativeSuggestOptions; 26import com.android.inputmethod.latin.utils.CollectionUtils; 27import com.android.inputmethod.latin.utils.JniUtils; 28import com.android.inputmethod.latin.utils.StringUtils; 29 30import java.io.File; 31import java.util.ArrayList; 32import java.util.Arrays; 33import java.util.Locale; 34import java.util.Map; 35 36/** 37 * Implements a static, compacted, binary dictionary of standard words. 38 */ 39// TODO: All methods which should be locked need to have a suffix "Locked". 40public final class BinaryDictionary extends Dictionary { 41 private static final String TAG = BinaryDictionary.class.getSimpleName(); 42 43 // Must be equal to MAX_WORD_LENGTH in native/jni/src/defines.h 44 private static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH; 45 // Must be equal to MAX_RESULTS in native/jni/src/defines.h 46 private static final int MAX_RESULTS = 18; 47 // Required space count for auto commit. 48 // TODO: Remove this heuristic. 49 private static final int SPACE_COUNT_FOR_AUTO_COMMIT = 3; 50 51 @UsedForTesting 52 public static final String UNIGRAM_COUNT_QUERY = "UNIGRAM_COUNT"; 53 @UsedForTesting 54 public static final String BIGRAM_COUNT_QUERY = "BIGRAM_COUNT"; 55 56 private long mNativeDict; 57 private final Locale mLocale; 58 private final long mDictSize; 59 private final String mDictFilePath; 60 private final int[] mInputCodePoints = new int[MAX_WORD_LENGTH]; 61 private final int[] mOutputCodePoints = new int[MAX_WORD_LENGTH * MAX_RESULTS]; 62 private final int[] mSpaceIndices = new int[MAX_RESULTS]; 63 private final int[] mOutputScores = new int[MAX_RESULTS]; 64 private final int[] mOutputTypes = new int[MAX_RESULTS]; 65 private final int[] mOutputAutoCommitFirstWordConfidence = new int[MAX_RESULTS]; 66 67 private final NativeSuggestOptions mNativeSuggestOptions = new NativeSuggestOptions(); 68 69 private final SparseArray<DicTraverseSession> mDicTraverseSessions = 70 CollectionUtils.newSparseArray(); 71 72 // TODO: There should be a way to remove used DicTraverseSession objects from 73 // {@code mDicTraverseSessions}. 74 private DicTraverseSession getTraverseSession(final int traverseSessionId) { 75 synchronized(mDicTraverseSessions) { 76 DicTraverseSession traverseSession = mDicTraverseSessions.get(traverseSessionId); 77 if (traverseSession == null) { 78 traverseSession = mDicTraverseSessions.get(traverseSessionId); 79 if (traverseSession == null) { 80 traverseSession = new DicTraverseSession(mLocale, mNativeDict, mDictSize); 81 mDicTraverseSessions.put(traverseSessionId, traverseSession); 82 } 83 } 84 return traverseSession; 85 } 86 } 87 88 /** 89 * Constructor for the binary dictionary. This is supposed to be called from the 90 * dictionary factory. 91 * @param filename the name of the file to read through native code. 92 * @param offset the offset of the dictionary data within the file. 93 * @param length the length of the binary data. 94 * @param useFullEditDistance whether to use the full edit distance in suggestions 95 * @param dictType the dictionary type, as a human-readable string 96 * @param isUpdatable whether to open the dictionary file in writable mode. 97 */ 98 public BinaryDictionary(final String filename, final long offset, final long length, 99 final boolean useFullEditDistance, final Locale locale, final String dictType, 100 final boolean isUpdatable) { 101 super(dictType); 102 mLocale = locale; 103 mDictSize = length; 104 mDictFilePath = filename; 105 mNativeSuggestOptions.setUseFullEditDistance(useFullEditDistance); 106 loadDictionary(filename, offset, length, isUpdatable); 107 } 108 109 static { 110 JniUtils.loadNativeLibrary(); 111 } 112 113 private static native boolean createEmptyDictFileNative(String filePath, long dictVersion, 114 String[] attributeKeyStringArray, String[] attributeValueStringArray); 115 private static native long openNative(String sourceDir, long dictOffset, long dictSize, 116 boolean isUpdatable); 117 private static native void flushNative(long dict, String filePath); 118 private static native boolean needsToRunGCNative(long dict, boolean mindsBlockByGC); 119 private static native void flushWithGCNative(long dict, String filePath); 120 private static native void closeNative(long dict); 121 private static native int getProbabilityNative(long dict, int[] word); 122 private static native int getBigramProbabilityNative(long dict, int[] word0, int[] word1); 123 private static native int getSuggestionsNative(long dict, long proximityInfo, 124 long traverseSession, int[] xCoordinates, int[] yCoordinates, int[] times, 125 int[] pointerIds, int[] inputCodePoints, int inputSize, int commitPoint, 126 int[] suggestOptions, int[] prevWordCodePointArray, 127 int[] outputCodePoints, int[] outputScores, int[] outputIndices, int[] outputTypes, 128 int[] outputAutoCommitFirstWordConfidence); 129 private static native float calcNormalizedScoreNative(int[] before, int[] after, int score); 130 private static native int editDistanceNative(int[] before, int[] after); 131 private static native void addUnigramWordNative(long dict, int[] word, int probability); 132 private static native void addBigramWordsNative(long dict, int[] word0, int[] word1, 133 int probability); 134 private static native void removeBigramWordsNative(long dict, int[] word0, int[] word1); 135 private static native int calculateProbabilityNative(long dict, int unigramProbability, 136 int bigramProbability); 137 private static native String getPropertyNative(long dict, String query); 138 139 @UsedForTesting 140 public static boolean createEmptyDictFile(final String filePath, final long dictVersion, 141 final Map<String, String> attributeMap) { 142 final String[] keyArray = new String[attributeMap.size()]; 143 final String[] valueArray = new String[attributeMap.size()]; 144 int index = 0; 145 for (final String key : attributeMap.keySet()) { 146 keyArray[index] = key; 147 valueArray[index] = attributeMap.get(key); 148 index++; 149 } 150 return createEmptyDictFileNative(filePath, dictVersion, keyArray, valueArray); 151 } 152 153 // TODO: Move native dict into session 154 private final void loadDictionary(final String path, final long startOffset, 155 final long length, final boolean isUpdatable) { 156 mNativeDict = openNative(path, startOffset, length, isUpdatable); 157 } 158 159 @Override 160 public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer, 161 final String prevWord, final ProximityInfo proximityInfo, 162 final boolean blockOffensiveWords, final int[] additionalFeaturesOptions) { 163 return getSuggestionsWithSessionId(composer, prevWord, proximityInfo, blockOffensiveWords, 164 additionalFeaturesOptions, 0 /* sessionId */); 165 } 166 167 @Override 168 public ArrayList<SuggestedWordInfo> getSuggestionsWithSessionId(final WordComposer composer, 169 final String prevWord, final ProximityInfo proximityInfo, 170 final boolean blockOffensiveWords, final int[] additionalFeaturesOptions, 171 final int sessionId) { 172 if (!isValidDictionary()) return null; 173 174 Arrays.fill(mInputCodePoints, Constants.NOT_A_CODE); 175 // TODO: toLowerCase in the native code 176 final int[] prevWordCodePointArray = (null == prevWord) 177 ? null : StringUtils.toCodePointArray(prevWord); 178 final int composerSize = composer.size(); 179 180 final boolean isGesture = composer.isBatchMode(); 181 if (composerSize <= 1 || !isGesture) { 182 if (composerSize > MAX_WORD_LENGTH - 1) return null; 183 for (int i = 0; i < composerSize; i++) { 184 mInputCodePoints[i] = composer.getCodeAt(i); 185 } 186 } 187 188 final InputPointers ips = composer.getInputPointers(); 189 final int inputSize = isGesture ? ips.getPointerSize() : composerSize; 190 mNativeSuggestOptions.setIsGesture(isGesture); 191 mNativeSuggestOptions.setAdditionalFeaturesOptions(additionalFeaturesOptions); 192 // proximityInfo and/or prevWordForBigrams may not be null. 193 final int count = getSuggestionsNative(mNativeDict, proximityInfo.getNativeProximityInfo(), 194 getTraverseSession(sessionId).getSession(), ips.getXCoordinates(), 195 ips.getYCoordinates(), ips.getTimes(), ips.getPointerIds(), mInputCodePoints, 196 inputSize, 0 /* commitPoint */, mNativeSuggestOptions.getOptions(), 197 prevWordCodePointArray, mOutputCodePoints, mOutputScores, mSpaceIndices, 198 mOutputTypes, mOutputAutoCommitFirstWordConfidence); 199 final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList(); 200 for (int j = 0; j < count; ++j) { 201 final int start = j * MAX_WORD_LENGTH; 202 int len = 0; 203 while (len < MAX_WORD_LENGTH && mOutputCodePoints[start + len] != 0) { 204 ++len; 205 } 206 if (len > 0) { 207 final int flags = mOutputTypes[j] & SuggestedWordInfo.KIND_MASK_FLAGS; 208 if (blockOffensiveWords 209 && 0 != (flags & SuggestedWordInfo.KIND_FLAG_POSSIBLY_OFFENSIVE) 210 && 0 == (flags & SuggestedWordInfo.KIND_FLAG_EXACT_MATCH)) { 211 // If we block potentially offensive words, and if the word is possibly 212 // offensive, then we don't output it unless it's also an exact match. 213 continue; 214 } 215 final int kind = mOutputTypes[j] & SuggestedWordInfo.KIND_MASK_KIND; 216 final int score = SuggestedWordInfo.KIND_WHITELIST == kind 217 ? SuggestedWordInfo.MAX_SCORE : mOutputScores[j]; 218 // TODO: check that all users of the `kind' parameter are ready to accept 219 // flags too and pass mOutputTypes[j] instead of kind 220 suggestions.add(new SuggestedWordInfo(new String(mOutputCodePoints, start, len), 221 score, kind, this /* sourceDict */, 222 mSpaceIndices[j] /* indexOfTouchPointOfSecondWord */, 223 mOutputAutoCommitFirstWordConfidence[0])); 224 } 225 } 226 return suggestions; 227 } 228 229 public boolean isValidDictionary() { 230 return mNativeDict != 0; 231 } 232 233 public static float calcNormalizedScore(final String before, final String after, 234 final int score) { 235 return calcNormalizedScoreNative(StringUtils.toCodePointArray(before), 236 StringUtils.toCodePointArray(after), score); 237 } 238 239 public static int editDistance(final String before, final String after) { 240 if (before == null || after == null) { 241 throw new IllegalArgumentException(); 242 } 243 return editDistanceNative(StringUtils.toCodePointArray(before), 244 StringUtils.toCodePointArray(after)); 245 } 246 247 @Override 248 public boolean isValidWord(final String word) { 249 return getFrequency(word) != NOT_A_PROBABILITY; 250 } 251 252 @Override 253 public int getFrequency(final String word) { 254 if (word == null) return NOT_A_PROBABILITY; 255 int[] codePoints = StringUtils.toCodePointArray(word); 256 return getProbabilityNative(mNativeDict, codePoints); 257 } 258 259 // TODO: Add a batch process version (isValidBigramMultiple?) to avoid excessive numbers of jni 260 // calls when checking for changes in an entire dictionary. 261 public boolean isValidBigram(final String word0, final String word1) { 262 return getBigramProbability(word0, word1) != NOT_A_PROBABILITY; 263 } 264 265 public int getBigramProbability(final String word0, final String word1) { 266 if (TextUtils.isEmpty(word0) || TextUtils.isEmpty(word1)) return NOT_A_PROBABILITY; 267 final int[] codePoints0 = StringUtils.toCodePointArray(word0); 268 final int[] codePoints1 = StringUtils.toCodePointArray(word1); 269 return getBigramProbabilityNative(mNativeDict, codePoints0, codePoints1); 270 } 271 272 // Add a unigram entry to binary dictionary in native code. 273 public void addUnigramWord(final String word, final int probability) { 274 if (TextUtils.isEmpty(word)) { 275 return; 276 } 277 final int[] codePoints = StringUtils.toCodePointArray(word); 278 addUnigramWordNative(mNativeDict, codePoints, probability); 279 } 280 281 // Add a bigram entry to binary dictionary in native code. 282 public void addBigramWords(final String word0, final String word1, final int probability) { 283 if (TextUtils.isEmpty(word0) || TextUtils.isEmpty(word1)) { 284 return; 285 } 286 final int[] codePoints0 = StringUtils.toCodePointArray(word0); 287 final int[] codePoints1 = StringUtils.toCodePointArray(word1); 288 addBigramWordsNative(mNativeDict, codePoints0, codePoints1, probability); 289 } 290 291 // Remove a bigram entry form binary dictionary in native code. 292 public void removeBigramWords(final String word0, final String word1) { 293 if (TextUtils.isEmpty(word0) || TextUtils.isEmpty(word1)) { 294 return; 295 } 296 final int[] codePoints0 = StringUtils.toCodePointArray(word0); 297 final int[] codePoints1 = StringUtils.toCodePointArray(word1); 298 removeBigramWordsNative(mNativeDict, codePoints0, codePoints1); 299 } 300 301 private void reopen() { 302 close(); 303 final File dictFile = new File(mDictFilePath); 304 mNativeDict = openNative(dictFile.getAbsolutePath(), 0 /* startOffset */, 305 dictFile.length(), true /* isUpdatable */); 306 } 307 308 public void flush() { 309 if (!isValidDictionary()) return; 310 flushNative(mNativeDict, mDictFilePath); 311 reopen(); 312 } 313 314 public void flushWithGC() { 315 if (!isValidDictionary()) return; 316 flushWithGCNative(mNativeDict, mDictFilePath); 317 reopen(); 318 } 319 320 /** 321 * Checks whether GC is needed to run or not. 322 * @param mindsBlockByGC Whether to mind operations blocked by GC. We don't need to care about 323 * the blocking in some situations such as in idle time or just before closing. 324 * @return whether GC is needed to run or not. 325 */ 326 public boolean needsToRunGC(final boolean mindsBlockByGC) { 327 if (!isValidDictionary()) return false; 328 return needsToRunGCNative(mNativeDict, mindsBlockByGC); 329 } 330 331 @UsedForTesting 332 public int calculateProbability(final int unigramProbability, final int bigramProbability) { 333 if (!isValidDictionary()) return NOT_A_PROBABILITY; 334 return calculateProbabilityNative(mNativeDict, unigramProbability, bigramProbability); 335 } 336 337 @UsedForTesting 338 public String getPropertyForTests(String query) { 339 if (!isValidDictionary()) return ""; 340 return getPropertyNative(mNativeDict, query); 341 } 342 343 @Override 344 public boolean shouldAutoCommit(final SuggestedWordInfo candidate) { 345 // TODO: actually use the confidence rather than use this completely broken heuristic 346 final String word = candidate.mWord; 347 final int length = word.length(); 348 int remainingSpaces = SPACE_COUNT_FOR_AUTO_COMMIT; 349 for (int i = 0; i < length; ++i) { 350 // This is okay because no low-surrogate and no high-surrogate can ever match the 351 // space character, so we don't need to take care of iterating on code points. 352 if (Constants.CODE_SPACE == word.charAt(i)) { 353 if (0 >= --remainingSpaces) return true; 354 } 355 } 356 return false; 357 } 358 359 @Override 360 public void close() { 361 synchronized (mDicTraverseSessions) { 362 final int sessionsSize = mDicTraverseSessions.size(); 363 for (int index = 0; index < sessionsSize; ++index) { 364 final DicTraverseSession traverseSession = mDicTraverseSessions.valueAt(index); 365 if (traverseSession != null) { 366 traverseSession.close(); 367 } 368 } 369 mDicTraverseSessions.clear(); 370 } 371 closeInternalLocked(); 372 } 373 374 private synchronized void closeInternalLocked() { 375 if (mNativeDict != 0) { 376 closeNative(mNativeDict); 377 mNativeDict = 0; 378 } 379 } 380 381 // TODO: Manage BinaryDictionary instances without using WeakReference or something. 382 @Override 383 protected void finalize() throws Throwable { 384 try { 385 closeInternalLocked(); 386 } finally { 387 super.finalize(); 388 } 389 } 390} 391