ArrayView.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <span>
#include <AUI/Util/ARaiiHelper.h>
#include "Globals.h"
#include "Converter.h"
 
namespace aui::jni {
   namespace detail {
       struct CastHelper {
           jobject value;
 
           template<typename T>
           operator T() const noexcept {
               return static_cast<T>(value);
           }
       };
   }

   template<convertible T>
   class ArrayView: public GlobalRef {
   public:
       using GlobalRef::GlobalRef;
 
       static ArrayView allocate(std::size_t size) {
           return (aui::jni::env()->*TypedMethods<T>::NewArray)(size);
       }
 
       std::size_t size() const noexcept {
           return aui::jni::env()->GetArrayLength((jarray)asObject());
       }
 
       template<aui::invocable<std::span<const T>> Callback>
       void view(Callback&& callback) const {
           //TypedMethods<T>::
           jboolean isCopy;
           auto ptr = (aui::jni::env()->*TypedMethods<T>::GetArrayElements)(detail::CastHelper{asObject()}, &isCopy);
           ARaiiHelper releaser = [&] {
               (aui::jni::env()->*TypedMethods<T>::ReleaseArrayElements)(detail::CastHelper{asObject()}, ptr, JNI_ABORT);
           };
 
           callback(std::span<const T>(ptr, size()));
       }
 
       template<aui::invocable<std::span<T>> Callback>
       void modify(Callback&& callback) const {
           //TypedMethods<T>::
           jboolean isCopy;
           auto ptr = (aui::jni::env()->*TypedMethods<T>::GetArrayElements)(detail::CastHelper{asObject()}, &isCopy);
           ARaiiHelper releaser = [&] {
               (aui::jni::env()->*TypedMethods<T>::ReleaseArrayElements)(detail::CastHelper{asObject()}, ptr, 0);
           };
 
           callback(std::span<T>(ptr, size()));
       }
 
       void set(std::span<const T> data, std::size_t at = 0) {
           (aui::jni::env()->*TypedMethods<T>::SetArrayRegion)(detail::CastHelper{asObject()}, at, data.size(), data.data());
       }
   };
 
   template<convertible T>
   struct Converter<ArrayView<T>>: public Converter<std::string> {
       static constexpr auto signature = "["_asl + ::aui::jni::signature_v<T>;
 
       static ArrayView<T> fromJni(jobject val) {
           return val;
       }
 
       static jobject toJni(const ArrayView<T>& value) {
           return value.asObject();
       }
   };
}

© 2025 AUI Framework Contributors. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. All trademarks are property of their respective owners.