| /* |
| * Copyright (C) 2018 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 "lang_id/lang-id_jni.h" |
| |
| #include <jni.h> |
| #include <type_traits> |
| #include <vector> |
| |
| #include "utils/base/logging.h" |
| #include "utils/java/scoped_local_ref.h" |
| #include "lang_id/fb_model/lang-id-from-fb.h" |
| #include "lang_id/lang-id.h" |
| |
| using libtextclassifier3::ScopedLocalRef; |
| using libtextclassifier3::ToStlString; |
| using libtextclassifier3::mobile::lang_id::GetLangIdFromFlatbufferFile; |
| using libtextclassifier3::mobile::lang_id::GetLangIdFromFlatbufferFileDescriptor; |
| using libtextclassifier3::mobile::lang_id::LangId; |
| using libtextclassifier3::mobile::lang_id::LangIdResult; |
| |
| namespace { |
| jobjectArray LangIdResultToJObjectArray(JNIEnv* env, |
| const LangIdResult& lang_id_result) { |
| const ScopedLocalRef<jclass> result_class( |
| env->FindClass(TC3_PACKAGE_PATH TC3_LANG_ID_CLASS_NAME_STR |
| "$LanguageResult"), |
| env); |
| if (!result_class) { |
| TC3_LOG(ERROR) << "Couldn't find LanguageResult class."; |
| return nullptr; |
| } |
| |
| // clang-format off |
| const std::vector<std::pair<std::string, float>>& predictions = |
| lang_id_result.predictions; |
| // clang-format on |
| const jmethodID result_class_constructor = |
| env->GetMethodID(result_class.get(), "<init>", "(Ljava/lang/String;F)V"); |
| const jobjectArray results = |
| env->NewObjectArray(predictions.size(), result_class.get(), nullptr); |
| for (int i = 0; i < predictions.size(); i++) { |
| ScopedLocalRef<jobject> result( |
| env->NewObject(result_class.get(), result_class_constructor, |
| env->NewStringUTF(predictions[i].first.c_str()), |
| static_cast<jfloat>(predictions[i].second))); |
| env->SetObjectArrayElement(results, i, result.get()); |
| } |
| return results; |
| } |
| } // namespace |
| |
| TC3_JNI_METHOD(jlong, TC3_LANG_ID_CLASS_NAME, nativeNew) |
| (JNIEnv* env, jobject thiz, jint fd) { |
| std::unique_ptr<LangId> lang_id = GetLangIdFromFlatbufferFileDescriptor(fd); |
| if (!lang_id->is_valid()) { |
| return reinterpret_cast<jlong>(nullptr); |
| } |
| return reinterpret_cast<jlong>(lang_id.release()); |
| } |
| |
| TC3_JNI_METHOD(jlong, TC3_LANG_ID_CLASS_NAME, nativeNewFromPath) |
| (JNIEnv* env, jobject thiz, jstring path) { |
| const std::string path_str = ToStlString(env, path); |
| std::unique_ptr<LangId> lang_id = GetLangIdFromFlatbufferFile(path_str); |
| if (!lang_id->is_valid()) { |
| return reinterpret_cast<jlong>(nullptr); |
| } |
| return reinterpret_cast<jlong>(lang_id.release()); |
| } |
| |
| TC3_JNI_METHOD(jobjectArray, TC3_LANG_ID_CLASS_NAME, nativeDetectLanguages) |
| (JNIEnv* env, jobject clazz, jlong ptr, jstring text) { |
| LangId* model = reinterpret_cast<LangId*>(ptr); |
| if (!model) { |
| return nullptr; |
| } |
| |
| const std::string text_str = ToStlString(env, text); |
| LangIdResult result; |
| model->FindLanguages(text_str, &result); |
| |
| return LangIdResultToJObjectArray(env, result); |
| } |
| |
| TC3_JNI_METHOD(void, TC3_LANG_ID_CLASS_NAME, nativeClose) |
| (JNIEnv* env, jobject clazz, jlong ptr) { |
| if (!ptr) { |
| TC3_LOG(ERROR) << "Trying to close null LangId."; |
| return; |
| } |
| LangId* model = reinterpret_cast<LangId*>(ptr); |
| delete model; |
| } |
| |
| TC3_JNI_METHOD(jint, TC3_LANG_ID_CLASS_NAME, nativeGetVersion) |
| (JNIEnv* env, jobject clazz, jlong ptr) { |
| if (!ptr) { |
| return -1; |
| } |
| LangId* model = reinterpret_cast<LangId*>(ptr); |
| return model->GetModelVersion(); |
| } |
| |
| TC3_JNI_METHOD(jint, TC3_LANG_ID_CLASS_NAME, nativeGetVersionFromFd) |
| (JNIEnv* env, jobject clazz, jint fd) { |
| std::unique_ptr<LangId> lang_id = GetLangIdFromFlatbufferFileDescriptor(fd); |
| if (!lang_id->is_valid()) { |
| return -1; |
| } |
| return lang_id->GetModelVersion(); |
| } |