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
17package com.android.inputmethod.latin;
18
19import com.android.inputmethod.latin.common.NativeSuggestOptions;
20import com.android.inputmethod.latin.define.DecoderSpecificConstants;
21import com.android.inputmethod.latin.utils.JniUtils;
22
23import java.util.Locale;
24
25public 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