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      1 /*
      2  * Copyright (C) 2012, 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 
     17 package com.android.inputmethod.latin;
     18 
     19 import com.android.inputmethod.latin.common.NativeSuggestOptions;
     20 import com.android.inputmethod.latin.define.DecoderSpecificConstants;
     21 import com.android.inputmethod.latin.utils.JniUtils;
     22 
     23 import java.util.Locale;
     24 
     25 public final class DicTraverseSession {
     26     static {
     27         JniUtils.loadNativeLibrary();
     28     }
     29     // Must be equal to MAX_RESULTS in native/jni/src/defines.h
     30     private static final int MAX_RESULTS = 18;
     31     public final int[] mInputCodePoints =
     32             new int[DecoderSpecificConstants.DICTIONARY_MAX_WORD_LENGTH];
     33     public final int[][] mPrevWordCodePointArrays =
     34             new int[DecoderSpecificConstants.MAX_PREV_WORD_COUNT_FOR_N_GRAM][];
     35     public final boolean[] mIsBeginningOfSentenceArray =
     36             new boolean[DecoderSpecificConstants.MAX_PREV_WORD_COUNT_FOR_N_GRAM];
     37     public final int[] mOutputSuggestionCount = new int[1];
     38     public final int[] mOutputCodePoints =
     39             new int[DecoderSpecificConstants.DICTIONARY_MAX_WORD_LENGTH * MAX_RESULTS];
     40     public final int[] mSpaceIndices = new int[MAX_RESULTS];
     41     public final int[] mOutputScores = new int[MAX_RESULTS];
     42     public final int[] mOutputTypes = new int[MAX_RESULTS];
     43     // Only one result is ever used
     44     public final int[] mOutputAutoCommitFirstWordConfidence = new int[1];
     45     public final float[] mInputOutputWeightOfLangModelVsSpatialModel = new float[1];
     46 
     47     public final NativeSuggestOptions mNativeSuggestOptions = new NativeSuggestOptions();
     48 
     49     private static native long setDicTraverseSessionNative(String locale, long dictSize);
     50     private static native void initDicTraverseSessionNative(long nativeDicTraverseSession,
     51             long dictionary, int[] previousWord, int previousWordLength);
     52     private static native void releaseDicTraverseSessionNative(long nativeDicTraverseSession);
     53 
     54     private long mNativeDicTraverseSession;
     55 
     56     public DicTraverseSession(Locale locale, long dictionary, long dictSize) {
     57         mNativeDicTraverseSession = createNativeDicTraverseSession(
     58                 locale != null ? locale.toString() : "", dictSize);
     59         initSession(dictionary);
     60     }
     61 
     62     public long getSession() {
     63         return mNativeDicTraverseSession;
     64     }
     65 
     66     public void initSession(long dictionary) {
     67         initSession(dictionary, null, 0);
     68     }
     69 
     70     public void initSession(long dictionary, int[] previousWord, int previousWordLength) {
     71         initDicTraverseSessionNative(
     72                 mNativeDicTraverseSession, dictionary, previousWord, previousWordLength);
     73     }
     74 
     75     private static long createNativeDicTraverseSession(String locale, long dictSize) {
     76         return setDicTraverseSessionNative(locale, dictSize);
     77     }
     78 
     79     private void closeInternal() {
     80         if (mNativeDicTraverseSession != 0) {
     81             releaseDicTraverseSessionNative(mNativeDicTraverseSession);
     82             mNativeDicTraverseSession = 0;
     83         }
     84     }
     85 
     86     public void close() {
     87         closeInternal();
     88     }
     89 
     90     @Override
     91     protected void finalize() throws Throwable {
     92         try {
     93             closeInternal();
     94         } finally {
     95             super.finalize();
     96         }
     97     }
     98 }
     99