/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "lang_id/lang-id_jni.h"
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#include <jni.h>
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#include <type_traits>
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#include <vector>
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#include "utils/base/logging.h"
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#include "utils/java/scoped_local_ref.h"
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#include "lang_id/fb_model/lang-id-from-fb.h"
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#include "lang_id/lang-id.h"
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using libtextclassifier3::ScopedLocalRef;
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using libtextclassifier3::ToStlString;
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using libtextclassifier3::mobile::lang_id::GetLangIdFromFlatbufferFile;
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using libtextclassifier3::mobile::lang_id::GetLangIdFromFlatbufferFileDescriptor;
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using libtextclassifier3::mobile::lang_id::LangId;
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using libtextclassifier3::mobile::lang_id::LangIdResult;
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namespace {
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jobjectArray LangIdResultToJObjectArray(JNIEnv* env,
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const LangIdResult& lang_id_result) {
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const ScopedLocalRef<jclass> result_class(
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env->FindClass(TC3_PACKAGE_PATH TC3_LANG_ID_CLASS_NAME_STR
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"$LanguageResult"),
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env);
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if (!result_class) {
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TC3_LOG(ERROR) << "Couldn't find LanguageResult class.";
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return nullptr;
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}
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// clang-format off
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const std::vector<std::pair<std::string, float>>& predictions =
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lang_id_result.predictions;
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// clang-format on
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const jmethodID result_class_constructor =
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env->GetMethodID(result_class.get(), "<init>", "(Ljava/lang/String;F)V");
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const jobjectArray results =
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env->NewObjectArray(predictions.size(), result_class.get(), nullptr);
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for (int i = 0; i < predictions.size(); i++) {
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ScopedLocalRef<jobject> result(
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env->NewObject(result_class.get(), result_class_constructor,
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env->NewStringUTF(predictions[i].first.c_str()),
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static_cast<jfloat>(predictions[i].second)));
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env->SetObjectArrayElement(results, i, result.get());
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}
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return results;
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}
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} // namespace
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TC3_JNI_METHOD(jlong, TC3_LANG_ID_CLASS_NAME, nativeNew)
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(JNIEnv* env, jobject thiz, jint fd) {
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std::unique_ptr<LangId> lang_id = GetLangIdFromFlatbufferFileDescriptor(fd);
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if (!lang_id->is_valid()) {
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return reinterpret_cast<jlong>(nullptr);
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}
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return reinterpret_cast<jlong>(lang_id.release());
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}
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TC3_JNI_METHOD(jlong, TC3_LANG_ID_CLASS_NAME, nativeNewFromPath)
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(JNIEnv* env, jobject thiz, jstring path) {
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const std::string path_str = ToStlString(env, path);
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std::unique_ptr<LangId> lang_id = GetLangIdFromFlatbufferFile(path_str);
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if (!lang_id->is_valid()) {
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return reinterpret_cast<jlong>(nullptr);
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}
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return reinterpret_cast<jlong>(lang_id.release());
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}
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TC3_JNI_METHOD(jobjectArray, TC3_LANG_ID_CLASS_NAME, nativeDetectLanguages)
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(JNIEnv* env, jobject clazz, jlong ptr, jstring text) {
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LangId* model = reinterpret_cast<LangId*>(ptr);
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if (!model) {
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return nullptr;
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}
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const std::string text_str = ToStlString(env, text);
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LangIdResult result;
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model->FindLanguages(text_str, &result);
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return LangIdResultToJObjectArray(env, result);
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}
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TC3_JNI_METHOD(void, TC3_LANG_ID_CLASS_NAME, nativeClose)
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(JNIEnv* env, jobject clazz, jlong ptr) {
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if (!ptr) {
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TC3_LOG(ERROR) << "Trying to close null LangId.";
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return;
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}
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LangId* model = reinterpret_cast<LangId*>(ptr);
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delete model;
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}
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TC3_JNI_METHOD(jint, TC3_LANG_ID_CLASS_NAME, nativeGetVersion)
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(JNIEnv* env, jobject clazz, jlong ptr) {
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if (!ptr) {
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return -1;
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}
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LangId* model = reinterpret_cast<LangId*>(ptr);
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return model->GetModelVersion();
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}
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TC3_JNI_METHOD(jint, TC3_LANG_ID_CLASS_NAME, nativeGetVersionFromFd)
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(JNIEnv* env, jobject clazz, jint fd) {
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std::unique_ptr<LangId> lang_id = GetLangIdFromFlatbufferFileDescriptor(fd);
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if (!lang_id->is_valid()) {
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return -1;
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}
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return lang_id->GetModelVersion();
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}
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TC3_JNI_METHOD(jfloat, TC3_LANG_ID_CLASS_NAME, nativeGetLangIdThreshold)
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(JNIEnv* env, jobject thizz, jlong ptr) {
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if (!ptr) {
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return -1.0;
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}
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LangId* model = reinterpret_cast<LangId*>(ptr);
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return model->GetFloatProperty("text_classifier_langid_threshold", -1.0);
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}
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