/*
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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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#ifndef LIBTEXTCLASSIFIER_UTILS_JAVA_JNI_BASE_H_
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#define LIBTEXTCLASSIFIER_UTILS_JAVA_JNI_BASE_H_
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#include <jni.h>
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#include <string>
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// When we use a macro as an argument for a macro, an additional level of
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// indirection is needed, if the macro argument is used with # or ##.
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#define TC3_ADD_QUOTES_HELPER(TOKEN) #TOKEN
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#define TC3_ADD_QUOTES(TOKEN) TC3_ADD_QUOTES_HELPER(TOKEN)
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#ifndef TC3_PACKAGE_NAME
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#define TC3_PACKAGE_NAME com_google_android_textclassifier
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#endif
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#ifndef TC3_PACKAGE_PATH
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#define TC3_PACKAGE_PATH \
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"com/google/android/textclassifier/"
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#endif
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#define TC3_JNI_METHOD_NAME_INTERNAL(package_name, class_name, method_name) \
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Java_##package_name##_##class_name##_##method_name
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#define TC3_JNI_METHOD_PRIMITIVE(return_type, package_name, class_name, \
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method_name) \
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JNIEXPORT return_type JNICALL TC3_JNI_METHOD_NAME_INTERNAL( \
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package_name, class_name, method_name)
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// The indirection is needed to correctly expand the TC3_PACKAGE_NAME macro.
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// See the explanation near TC3_ADD_QUOTES macro.
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#define TC3_JNI_METHOD2(return_type, package_name, class_name, method_name) \
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TC3_JNI_METHOD_PRIMITIVE(return_type, package_name, class_name, method_name)
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#define TC3_JNI_METHOD(return_type, class_name, method_name) \
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TC3_JNI_METHOD2(return_type, TC3_PACKAGE_NAME, class_name, method_name)
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#define TC3_JNI_METHOD_NAME2(package_name, class_name, method_name) \
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TC3_JNI_METHOD_NAME_INTERNAL(package_name, class_name, method_name)
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#define TC3_JNI_METHOD_NAME(class_name, method_name) \
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TC3_JNI_METHOD_NAME2(TC3_PACKAGE_NAME, class_name, method_name)
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namespace libtextclassifier3 {
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template <typename T, typename F>
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std::pair<bool, T> CallJniMethod0(JNIEnv* env, jobject object,
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jclass class_object, F function,
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const std::string& method_name,
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const std::string& return_java_type) {
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const jmethodID method = env->GetMethodID(class_object, method_name.c_str(),
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("()" + return_java_type).c_str());
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if (!method) {
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return std::make_pair(false, T());
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}
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return std::make_pair(true, (env->*function)(object, method));
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}
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std::string ToStlString(JNIEnv* env, const jstring& str);
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// Get system-level file descriptor from AssetFileDescriptor.
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jint GetFdFromAssetFileDescriptor(JNIEnv* env, jobject afd);
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// Get system-level file descriptor from FileDescriptor.
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jint GetFdFromFileDescriptor(JNIEnv* env, jobject fd);
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} // namespace libtextclassifier3
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#endif // LIBTEXTCLASSIFIER_UTILS_JAVA_JNI_BASE_H_
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