15f6d4ae34
Bug: 7268357 Change-Id: I0b7e0c19f04af9ae30874d0a4c26ad81bc80be8c
241 lines
10 KiB
Java
241 lines
10 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"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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import android.content.Context;
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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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public static final String DICTIONARY_PACK_AUTHORITY =
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"com.android.inputmethod.latin.dictionarypack";
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/**
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* There is a difference between what java and native code can handle.
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* This value should only be used in BinaryDictionary.java
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* It is necessary to keep it at this value because some languages e.g. German have
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* really long words.
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*/
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public static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
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public static final int MAX_WORDS = 18;
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public static final int MAX_SPACES = 16;
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private static final int MAX_PREDICTIONS = 60;
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private static final int MAX_RESULTS = Math.max(MAX_PREDICTIONS, MAX_WORDS);
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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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// TODO: The below should be int[] mOutputCodePoints
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private final char[] mOutputChars = new char[MAX_WORD_LENGTH * MAX_RESULTS];
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private final int[] mSpaceIndices = new int[MAX_SPACES];
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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(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 context the context to access the environment from.
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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 Context context,
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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 native long openNative(String sourceDir, long dictOffset, long dictSize,
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int fullWordMultiplier, int maxWordLength, int maxWords, int maxPredictions);
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private native void closeNative(long dict);
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private native int getFrequencyNative(long dict, int[] word);
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private native boolean isValidBigramNative(long dict, int[] word1, int[] word2);
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private native int getSuggestionsNative(long dict, long proximityInfo, long traverseSession,
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int[] xCoordinates, int[] yCoordinates, int[] times, int[] pointerIds,
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int[] inputCodePoints, int codesSize, int commitPoint, boolean isGesture,
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int[] prevWordCodePointArray, boolean useFullEditDistance, char[] outputChars,
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int[] outputScores, int[] outputIndices, int[] outputTypes);
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private static native float calcNormalizedScoreNative(char[] before, char[] after, int score);
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private static native int editDistanceNative(char[] before, char[] after);
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// TODO: Move native dict into session
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private final void loadDictionary(String path, long startOffset, long length) {
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mNativeDict = openNative(path, startOffset, length, FULL_WORD_SCORE_MULTIPLIER,
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MAX_WORD_LENGTH, MAX_WORDS, MAX_PREDICTIONS);
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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 CharSequence 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 CharSequence 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.toString());
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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 codesSize = isGesture ? ips.getPointerSize() : composerSize;
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// proximityInfo and/or prevWordForBigrams may not be null.
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final int tmpCount = getSuggestionsNative(mNativeDict,
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proximityInfo.getNativeProximityInfo(), getTraverseSession(sessionId).getSession(),
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ips.getXCoordinates(), ips.getYCoordinates(), ips.getTimes(), ips.getPointerIds(),
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mInputCodePoints, codesSize, 0 /* commitPoint */, isGesture, prevWordCodePointArray,
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mUseFullEditDistance, mOutputChars, mOutputScores, mSpaceIndices, mOutputTypes);
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final int count = Math.min(tmpCount, MAX_PREDICTIONS);
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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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if (composerSize > 0 && mOutputScores[j] < 1) break;
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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 && mOutputChars[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(
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new String(mOutputChars, start, len), 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(String before, String after, int score) {
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return calcNormalizedScoreNative(before.toCharArray(), after.toCharArray(), score);
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}
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public static int editDistance(String before, 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(before.toCharArray(), after.toCharArray());
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}
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@Override
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public boolean isValidWord(CharSequence 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(CharSequence word) {
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if (word == null) return -1;
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int[] codePoints = StringUtils.toCodePointArray(word.toString());
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return getFrequencyNative(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(CharSequence word1, CharSequence word2) {
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if (TextUtils.isEmpty(word1) || TextUtils.isEmpty(word2)) return false;
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int[] chars1 = StringUtils.toCodePointArray(word1.toString());
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int[] chars2 = StringUtils.toCodePointArray(word2.toString());
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return isValidBigramNative(mNativeDict, chars1, chars2);
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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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