| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "util/java/string_utils.h" |
| |
| #include "util/base/logging.h" |
| |
| namespace libtextclassifier2 { |
| |
| bool JStringToUtf8String(JNIEnv* env, const jstring& jstr, |
| std::string* result) { |
| if (jstr == nullptr) { |
| *result = std::string(); |
| return false; |
| } |
| |
| jclass string_class = env->FindClass("java/lang/String"); |
| if (!string_class) { |
| TC_LOG(ERROR) << "Can't find String class"; |
| return false; |
| } |
| |
| jmethodID get_bytes_id = |
| env->GetMethodID(string_class, "getBytes", "(Ljava/lang/String;)[B"); |
| |
| jstring encoding = env->NewStringUTF("UTF-8"); |
| jbyteArray array = reinterpret_cast<jbyteArray>( |
| env->CallObjectMethod(jstr, get_bytes_id, encoding)); |
| |
| jbyte* const array_bytes = env->GetByteArrayElements(array, JNI_FALSE); |
| int length = env->GetArrayLength(array); |
| |
| *result = std::string(reinterpret_cast<char*>(array_bytes), length); |
| |
| // Release the array. |
| env->ReleaseByteArrayElements(array, array_bytes, JNI_ABORT); |
| env->DeleteLocalRef(array); |
| env->DeleteLocalRef(string_class); |
| env->DeleteLocalRef(encoding); |
| |
| return true; |
| } |
| |
| } // namespace libtextclassifier2 |