| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| #ifndef __CONSTRUCT_HPP__ |
| #define __CONSTRUCT_HPP__ |
| |
| #include <vector> |
| |
| #include <jni.h> |
| |
| bool construct(JNIEnv* env, jboolean jbool); |
| |
| template <typename T> |
| T construct(JNIEnv* env, jobject jobj); |
| |
| template <typename T> |
| std::vector<T> constructFromIterable(JNIEnv* env, jobject jiterable) |
| { |
| std::vector<T> result; |
| |
| jclass clazz = env->GetObjectClass(jiterable); |
| |
| // Iterator iterator = iterable.iterator(); |
| jmethodID iterator = |
| env->GetMethodID(clazz, "iterator", "()Ljava/util/Iterator;"); |
| jobject jiterator = env->CallObjectMethod(jiterable, iterator); |
| |
| jclass iteratorClazz = env->GetObjectClass(jiterator); |
| |
| // while (iterator.hasNext()) { |
| jmethodID hasNext = env->GetMethodID(iteratorClazz, "hasNext", "()Z"); |
| |
| jmethodID next = |
| env->GetMethodID(iteratorClazz, "next", "()Ljava/lang/Object;"); |
| |
| while (env->CallBooleanMethod(jiterator, hasNext)) { |
| // Object item = iterator.next(); |
| jobject jitem = env->CallObjectMethod(jiterator, next); |
| result.emplace_back(construct<T>(env, jitem)); |
| } |
| |
| return result; |
| } |
| |
| #endif // __CONSTRUCT_HPP__ |