1 /* 2 * Copyright (C) 2018 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 #include "utils/java/string_utils.h" 18 19 #include "utils/base/logging.h" 20 21 namespace libtextclassifier3 { 22 23 bool JByteArrayToString(JNIEnv* env, const jbyteArray& array, 24 std::string* result) { 25 jbyte* const array_bytes = env->GetByteArrayElements(array, JNI_FALSE); 26 if (array_bytes == nullptr) { 27 return false; 28 } 29 30 const int array_length = env->GetArrayLength(array); 31 *result = std::string(reinterpret_cast<char*>(array_bytes), array_length); 32 33 env->ReleaseByteArrayElements(array, array_bytes, JNI_ABORT); 34 35 return true; 36 } 37 38 bool JStringToUtf8String(JNIEnv* env, const jstring& jstr, 39 std::string* result) { 40 if (jstr == nullptr) { 41 *result = std::string(); 42 return false; 43 } 44 45 jclass string_class = env->FindClass("java/lang/String"); 46 if (!string_class) { 47 TC3_LOG(ERROR) << "Can't find String class"; 48 return false; 49 } 50 51 jmethodID get_bytes_id = 52 env->GetMethodID(string_class, "getBytes", "(Ljava/lang/String;)[B"); 53 54 jstring encoding = env->NewStringUTF("UTF-8"); 55 56 jbyteArray array = reinterpret_cast<jbyteArray>( 57 env->CallObjectMethod(jstr, get_bytes_id, encoding)); 58 59 JByteArrayToString(env, array, result); 60 61 // Release the array. 62 env->DeleteLocalRef(array); 63 env->DeleteLocalRef(string_class); 64 env->DeleteLocalRef(encoding); 65 66 return true; 67 } 68 69 ScopedStringChars GetScopedStringChars(JNIEnv* env, jstring string, 70 jboolean* is_copy) { 71 return ScopedStringChars(env->GetStringUTFChars(string, is_copy), 72 StringCharsReleaser(env, string)); 73 } 74 75 } // namespace libtextclassifier3 76
