242 lines
10 KiB
Java
242 lines
10 KiB
Java
/*
|
|
* Copyright (C) 2008 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.text.TextUtils;
|
|
import android.util.SparseArray;
|
|
|
|
import com.android.inputmethod.keyboard.ProximityInfo;
|
|
import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.Arrays;
|
|
import java.util.Locale;
|
|
|
|
/**
|
|
* Implements a static, compacted, binary dictionary of standard words.
|
|
*/
|
|
public final class BinaryDictionary extends Dictionary {
|
|
private static final String TAG = BinaryDictionary.class.getSimpleName();
|
|
|
|
// Must be equal to MAX_WORD_LENGTH in native/jni/src/defines.h
|
|
private static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
|
|
// Must be equal to MAX_RESULTS in native/jni/src/defines.h
|
|
private static final int MAX_RESULTS = 18;
|
|
|
|
private long mNativeDict;
|
|
private final Locale mLocale;
|
|
private final int[] mInputCodePoints = new int[MAX_WORD_LENGTH];
|
|
private final int[] mOutputCodePoints = new int[MAX_WORD_LENGTH * MAX_RESULTS];
|
|
private final int[] mSpaceIndices = new int[MAX_RESULTS];
|
|
private final int[] mOutputScores = new int[MAX_RESULTS];
|
|
private final int[] mOutputTypes = new int[MAX_RESULTS];
|
|
|
|
private final boolean mUseFullEditDistance;
|
|
|
|
private final SparseArray<DicTraverseSession> mDicTraverseSessions =
|
|
CollectionUtils.newSparseArray();
|
|
|
|
// TODO: There should be a way to remove used DicTraverseSession objects from
|
|
// {@code mDicTraverseSessions}.
|
|
private DicTraverseSession getTraverseSession(final int traverseSessionId) {
|
|
synchronized(mDicTraverseSessions) {
|
|
DicTraverseSession traverseSession = mDicTraverseSessions.get(traverseSessionId);
|
|
if (traverseSession == null) {
|
|
traverseSession = mDicTraverseSessions.get(traverseSessionId);
|
|
if (traverseSession == null) {
|
|
traverseSession = new DicTraverseSession(mLocale, mNativeDict);
|
|
mDicTraverseSessions.put(traverseSessionId, traverseSession);
|
|
}
|
|
}
|
|
return traverseSession;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Constructor for the binary dictionary. This is supposed to be called from the
|
|
* dictionary factory.
|
|
* @param filename the name of the file to read through native code.
|
|
* @param offset the offset of the dictionary data within the file.
|
|
* @param length the length of the binary data.
|
|
* @param useFullEditDistance whether to use the full edit distance in suggestions
|
|
* @param dictType the dictionary type, as a human-readable string
|
|
*/
|
|
public BinaryDictionary(final String filename, final long offset, final long length,
|
|
final boolean useFullEditDistance, final Locale locale, final String dictType) {
|
|
super(dictType);
|
|
mLocale = locale;
|
|
mUseFullEditDistance = useFullEditDistance;
|
|
loadDictionary(filename, offset, length);
|
|
}
|
|
|
|
static {
|
|
JniUtils.loadNativeLibrary();
|
|
}
|
|
|
|
private static native long openNative(String sourceDir, long dictOffset, long dictSize);
|
|
private static native void closeNative(long dict);
|
|
private static native int getProbabilityNative(long dict, int[] word);
|
|
private static native boolean isValidBigramNative(long dict, int[] word1, int[] word2);
|
|
private static native int getSuggestionsNative(long dict, long proximityInfo,
|
|
long traverseSession, int[] xCoordinates, int[] yCoordinates, int[] times,
|
|
int[] pointerIds, int[] inputCodePoints, int inputSize, int commitPoint,
|
|
boolean isGesture, int[] prevWordCodePointArray, boolean useFullEditDistance,
|
|
int[] outputCodePoints, int[] outputScores, int[] outputIndices, int[] outputTypes);
|
|
private static native float calcNormalizedScoreNative(int[] before, int[] after, int score);
|
|
private static native int editDistanceNative(int[] before, int[] after);
|
|
|
|
// TODO: Move native dict into session
|
|
private final void loadDictionary(final String path, final long startOffset,
|
|
final long length) {
|
|
mNativeDict = openNative(path, startOffset, length);
|
|
}
|
|
|
|
@Override
|
|
public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
|
|
final String prevWord, final ProximityInfo proximityInfo,
|
|
final boolean blockOffensiveWords) {
|
|
return getSuggestionsWithSessionId(composer, prevWord, proximityInfo, blockOffensiveWords,
|
|
0 /* sessionId */);
|
|
}
|
|
|
|
@Override
|
|
public ArrayList<SuggestedWordInfo> getSuggestionsWithSessionId(final WordComposer composer,
|
|
final String prevWord, final ProximityInfo proximityInfo,
|
|
final boolean blockOffensiveWords, final int sessionId) {
|
|
if (!isValidDictionary()) return null;
|
|
|
|
Arrays.fill(mInputCodePoints, Constants.NOT_A_CODE);
|
|
// TODO: toLowerCase in the native code
|
|
final int[] prevWordCodePointArray = (null == prevWord)
|
|
? null : StringUtils.toCodePointArray(prevWord);
|
|
final int composerSize = composer.size();
|
|
|
|
final boolean isGesture = composer.isBatchMode();
|
|
if (composerSize <= 1 || !isGesture) {
|
|
if (composerSize > MAX_WORD_LENGTH - 1) return null;
|
|
for (int i = 0; i < composerSize; i++) {
|
|
mInputCodePoints[i] = composer.getCodeAt(i);
|
|
}
|
|
}
|
|
|
|
final InputPointers ips = composer.getInputPointers();
|
|
final int inputSize = isGesture ? ips.getPointerSize() : composerSize;
|
|
// proximityInfo and/or prevWordForBigrams may not be null.
|
|
final int count = getSuggestionsNative(mNativeDict, proximityInfo.getNativeProximityInfo(),
|
|
getTraverseSession(sessionId).getSession(), ips.getXCoordinates(),
|
|
ips.getYCoordinates(), ips.getTimes(), ips.getPointerIds(), mInputCodePoints,
|
|
inputSize, 0 /* commitPoint */, isGesture, prevWordCodePointArray,
|
|
mUseFullEditDistance, mOutputCodePoints, mOutputScores, mSpaceIndices,
|
|
mOutputTypes);
|
|
final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
|
|
for (int j = 0; j < count; ++j) {
|
|
final int start = j * MAX_WORD_LENGTH;
|
|
int len = 0;
|
|
while (len < MAX_WORD_LENGTH && mOutputCodePoints[start + len] != 0) {
|
|
++len;
|
|
}
|
|
if (len > 0) {
|
|
final int flags = mOutputTypes[j] & SuggestedWordInfo.KIND_MASK_FLAGS;
|
|
if (blockOffensiveWords
|
|
&& 0 != (flags & SuggestedWordInfo.KIND_FLAG_POSSIBLY_OFFENSIVE)
|
|
&& 0 == (flags & SuggestedWordInfo.KIND_FLAG_EXACT_MATCH)) {
|
|
// If we block potentially offensive words, and if the word is possibly
|
|
// offensive, then we don't output it unless it's also an exact match.
|
|
continue;
|
|
}
|
|
final int kind = mOutputTypes[j] & SuggestedWordInfo.KIND_MASK_KIND;
|
|
final int score = SuggestedWordInfo.KIND_WHITELIST == kind
|
|
? SuggestedWordInfo.MAX_SCORE : mOutputScores[j];
|
|
// TODO: check that all users of the `kind' parameter are ready to accept
|
|
// flags too and pass mOutputTypes[j] instead of kind
|
|
suggestions.add(new SuggestedWordInfo(new String(mOutputCodePoints, start, len),
|
|
score, kind, mDictType));
|
|
}
|
|
}
|
|
return suggestions;
|
|
}
|
|
|
|
public boolean isValidDictionary() {
|
|
return mNativeDict != 0;
|
|
}
|
|
|
|
public static float calcNormalizedScore(final String before, final String after,
|
|
final int score) {
|
|
return calcNormalizedScoreNative(StringUtils.toCodePointArray(before),
|
|
StringUtils.toCodePointArray(after), score);
|
|
}
|
|
|
|
public static int editDistance(final String before, final String after) {
|
|
if (before == null || after == null) {
|
|
throw new IllegalArgumentException();
|
|
}
|
|
return editDistanceNative(StringUtils.toCodePointArray(before),
|
|
StringUtils.toCodePointArray(after));
|
|
}
|
|
|
|
@Override
|
|
public boolean isValidWord(final String word) {
|
|
return getFrequency(word) >= 0;
|
|
}
|
|
|
|
@Override
|
|
public int getFrequency(final String word) {
|
|
if (word == null) return -1;
|
|
int[] codePoints = StringUtils.toCodePointArray(word);
|
|
return getProbabilityNative(mNativeDict, codePoints);
|
|
}
|
|
|
|
// TODO: Add a batch process version (isValidBigramMultiple?) to avoid excessive numbers of jni
|
|
// calls when checking for changes in an entire dictionary.
|
|
public boolean isValidBigram(final String word1, final String word2) {
|
|
if (TextUtils.isEmpty(word1) || TextUtils.isEmpty(word2)) return false;
|
|
final int[] codePoints1 = StringUtils.toCodePointArray(word1);
|
|
final int[] codePoints2 = StringUtils.toCodePointArray(word2);
|
|
return isValidBigramNative(mNativeDict, codePoints1, codePoints2);
|
|
}
|
|
|
|
@Override
|
|
public void close() {
|
|
synchronized (mDicTraverseSessions) {
|
|
final int sessionsSize = mDicTraverseSessions.size();
|
|
for (int index = 0; index < sessionsSize; ++index) {
|
|
final DicTraverseSession traverseSession = mDicTraverseSessions.valueAt(index);
|
|
if (traverseSession != null) {
|
|
traverseSession.close();
|
|
}
|
|
}
|
|
}
|
|
closeInternal();
|
|
}
|
|
|
|
private synchronized void closeInternal() {
|
|
if (mNativeDict != 0) {
|
|
closeNative(mNativeDict);
|
|
mNativeDict = 0;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void finalize() throws Throwable {
|
|
try {
|
|
closeInternal();
|
|
} finally {
|
|
super.finalize();
|
|
}
|
|
}
|
|
}
|