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      1 /*
      2  * Copyright (C) 2014 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 #ifndef LATINIME_JNI_DATA_UTILS_H
     18 #define LATINIME_JNI_DATA_UTILS_H
     19 
     20 #include <vector>
     21 
     22 #include "defines.h"
     23 #include "jni.h"
     24 #include "suggest/core/session/prev_words_info.h"
     25 #include "suggest/core/policy/dictionary_header_structure_policy.h"
     26 #include "suggest/policyimpl/dictionary/header/header_read_write_utils.h"
     27 #include "utils/char_utils.h"
     28 
     29 namespace latinime {
     30 
     31 class JniDataUtils {
     32  public:
     33     static void jintarrayToVector(JNIEnv *env, jintArray array, std::vector<int> *const outVector) {
     34         if (!array) {
     35             outVector->clear();
     36             return;
     37         }
     38         const jsize arrayLength = env->GetArrayLength(array);
     39         outVector->resize(arrayLength);
     40         env->GetIntArrayRegion(array, 0 /* start */, arrayLength, outVector->data());
     41     }
     42 
     43     static DictionaryHeaderStructurePolicy::AttributeMap constructAttributeMap(JNIEnv *env,
     44             jobjectArray attributeKeyStringArray, jobjectArray attributeValueStringArray) {
     45         DictionaryHeaderStructurePolicy::AttributeMap attributeMap;
     46         const int keyCount = env->GetArrayLength(attributeKeyStringArray);
     47         for (int i = 0; i < keyCount; i++) {
     48             jstring keyString = static_cast<jstring>(
     49                     env->GetObjectArrayElement(attributeKeyStringArray, i));
     50             const jsize keyUtf8Length = env->GetStringUTFLength(keyString);
     51             char keyChars[keyUtf8Length + 1];
     52             env->GetStringUTFRegion(keyString, 0, env->GetStringLength(keyString), keyChars);
     53             keyChars[keyUtf8Length] = '\0';
     54             DictionaryHeaderStructurePolicy::AttributeMap::key_type key;
     55             HeaderReadWriteUtils::insertCharactersIntoVector(keyChars, &key);
     56 
     57             jstring valueString = static_cast<jstring>(
     58                     env->GetObjectArrayElement(attributeValueStringArray, i));
     59             const jsize valueUtf8Length = env->GetStringUTFLength(valueString);
     60             char valueChars[valueUtf8Length + 1];
     61             env->GetStringUTFRegion(valueString, 0, env->GetStringLength(valueString), valueChars);
     62             valueChars[valueUtf8Length] = '\0';
     63             DictionaryHeaderStructurePolicy::AttributeMap::mapped_type value;
     64             HeaderReadWriteUtils::insertCharactersIntoVector(valueChars, &value);
     65             attributeMap[key] = value;
     66         }
     67         return attributeMap;
     68     }
     69 
     70     static void outputCodePoints(JNIEnv *env, jintArray intArrayToOutputCodePoints, const int start,
     71             const int maxLength, const int *const codePoints, const int codePointCount,
     72             const bool needsNullTermination) {
     73         const int codePointBufSize = std::min(maxLength, codePointCount);
     74         int outputCodePonts[codePointBufSize];
     75         int outputCodePointCount = 0;
     76         for (int i = 0; i < codePointBufSize; ++i) {
     77             const int codePoint = codePoints[i];
     78             int codePointToOutput = codePoint;
     79             if (!CharUtils::isInUnicodeSpace(codePoint)) {
     80                 if (codePoint == CODE_POINT_BEGINNING_OF_SENTENCE) {
     81                     // Just skip Beginning-of-Sentence marker.
     82                     continue;
     83                 }
     84                 codePointToOutput = CODE_POINT_REPLACEMENT_CHARACTER;
     85             } else if (codePoint >= 0x01 && codePoint <= 0x1F) {
     86                 // Control code.
     87                 codePointToOutput = CODE_POINT_REPLACEMENT_CHARACTER;
     88             }
     89             outputCodePonts[outputCodePointCount++] = codePointToOutput;
     90         }
     91         env->SetIntArrayRegion(intArrayToOutputCodePoints, start, outputCodePointCount,
     92                 outputCodePonts);
     93         if (needsNullTermination && outputCodePointCount < maxLength) {
     94             env->SetIntArrayRegion(intArrayToOutputCodePoints, start + outputCodePointCount,
     95                     1 /* len */, &CODE_POINT_NULL);
     96         }
     97     }
     98 
     99     static PrevWordsInfo constructPrevWordsInfo(JNIEnv *env, jobjectArray prevWordCodePointArrays,
    100             jbooleanArray isBeginningOfSentenceArray) {
    101         int prevWordCodePoints[MAX_PREV_WORD_COUNT_FOR_N_GRAM][MAX_WORD_LENGTH];
    102         int prevWordCodePointCount[MAX_PREV_WORD_COUNT_FOR_N_GRAM];
    103         bool isBeginningOfSentence[MAX_PREV_WORD_COUNT_FOR_N_GRAM];
    104         jsize prevWordsCount = env->GetArrayLength(prevWordCodePointArrays);
    105         for (size_t i = 0; i < NELEMS(prevWordCodePoints); ++i) {
    106             prevWordCodePointCount[i] = 0;
    107             isBeginningOfSentence[i] = false;
    108             if (prevWordsCount <= static_cast<int>(i)) {
    109                 continue;
    110             }
    111             jintArray prevWord = (jintArray)env->GetObjectArrayElement(prevWordCodePointArrays, i);
    112             if (!prevWord) {
    113                 continue;
    114             }
    115             jsize prevWordLength = env->GetArrayLength(prevWord);
    116             if (prevWordLength > MAX_WORD_LENGTH) {
    117                 continue;
    118             }
    119             env->GetIntArrayRegion(prevWord, 0, prevWordLength, prevWordCodePoints[i]);
    120             prevWordCodePointCount[i] = prevWordLength;
    121             jboolean isBeginningOfSentenceBoolean = JNI_FALSE;
    122             env->GetBooleanArrayRegion(isBeginningOfSentenceArray, i, 1 /* len */,
    123                     &isBeginningOfSentenceBoolean);
    124             isBeginningOfSentence[i] = isBeginningOfSentenceBoolean == JNI_TRUE;
    125         }
    126         return PrevWordsInfo(prevWordCodePoints, prevWordCodePointCount, isBeginningOfSentence,
    127                 MAX_PREV_WORD_COUNT_FOR_N_GRAM);
    128     }
    129 
    130     static void putBooleanToArray(JNIEnv *env, jbooleanArray array, const int index,
    131             const jboolean value) {
    132         env->SetBooleanArrayRegion(array, index, 1 /* len */, &value);
    133     }
    134 
    135     static void putIntToArray(JNIEnv *env, jintArray array, const int index, const int value) {
    136         env->SetIntArrayRegion(array, index, 1 /* len */, &value);
    137     }
    138 
    139     static void putFloatToArray(JNIEnv *env, jfloatArray array, const int index,
    140             const float value) {
    141         env->SetFloatArrayRegion(array, index, 1 /* len */, &value);
    142     }
    143 
    144  private:
    145     DISALLOW_IMPLICIT_CONSTRUCTORS(JniDataUtils);
    146 
    147     static const int CODE_POINT_REPLACEMENT_CHARACTER;
    148     static const int CODE_POINT_NULL;
    149 };
    150 } // namespace latinime
    151 #endif // LATINIME_JNI_DATA_UTILS_H
    152