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// ArduinoJson - https://arduinojson.org
// Copyright Benoit Blanchon 2014-2021
// MIT License
#pragma once
#include "lib/ArduinoJson/Document/JsonDocument.hpp"
namespace ARDUINOJSON_NAMESPACE {
// Helper to implement the "base-from-member" idiom
// (we need to store the allocator before constructing JsonDocument)
template <typename TAllocator>
class AllocatorOwner {
public:
AllocatorOwner() {}
AllocatorOwner(const AllocatorOwner& src) : _allocator(src._allocator) {}
AllocatorOwner(TAllocator a) : _allocator(a) {}
void* allocate(size_t size) {
return _allocator.allocate(size);
}
void deallocate(void* ptr) {
if (ptr)
_allocator.deallocate(ptr);
}
void* reallocate(void* ptr, size_t new_size) {
return _allocator.reallocate(ptr, new_size);
}
TAllocator& allocator() {
return _allocator;
}
private:
TAllocator _allocator;
};
template <typename TAllocator>
class BasicJsonDocument : AllocatorOwner<TAllocator>, public JsonDocument {
public:
explicit BasicJsonDocument(size_t capa, TAllocator alloc = TAllocator())
: AllocatorOwner<TAllocator>(alloc), JsonDocument(allocPool(capa)) {}
// Copy-constructor
BasicJsonDocument(const BasicJsonDocument& src)
: AllocatorOwner<TAllocator>(src), JsonDocument() {
copyAssignFrom(src);
}
// Move-constructor
#if ARDUINOJSON_HAS_RVALUE_REFERENCES
BasicJsonDocument(BasicJsonDocument&& src) : AllocatorOwner<TAllocator>(src) {
moveAssignFrom(src);
}
#endif
BasicJsonDocument(const JsonDocument& src) {
copyAssignFrom(src);
}
// Construct from variant, array, or object
template <typename T>
BasicJsonDocument(
const T& src,
typename enable_if<
is_same<T, VariantRef>::value || is_same<T, VariantConstRef>::value ||
is_same<T, ArrayRef>::value || is_same<T, ArrayConstRef>::value ||
is_same<T, ObjectRef>::value ||
is_same<T, ObjectConstRef>::value>::type* = 0)
: JsonDocument(allocPool(src.memoryUsage())) {
set(src);
}
// disambiguate
BasicJsonDocument(VariantRef src)
: JsonDocument(allocPool(src.memoryUsage())) {
set(src);
}
~BasicJsonDocument() {
freePool();
}
BasicJsonDocument& operator=(const BasicJsonDocument& src) {
copyAssignFrom(src);
return *this;
}
#if ARDUINOJSON_HAS_RVALUE_REFERENCES
BasicJsonDocument& operator=(BasicJsonDocument&& src) {
moveAssignFrom(src);
return *this;
}
#endif
template <typename T>
BasicJsonDocument& operator=(const T& src) {
reallocPoolIfTooSmall(src.memoryUsage());
set(src);
return *this;
}
void shrinkToFit() {
ptrdiff_t bytes_reclaimed = _pool.squash();
if (bytes_reclaimed == 0)
return;
void* old_ptr = _pool.buffer();
void* new_ptr = this->reallocate(old_ptr, _pool.capacity());
ptrdiff_t ptr_offset =
static_cast<char*>(new_ptr) - static_cast<char*>(old_ptr);
_pool.movePointers(ptr_offset);
_data.movePointers(ptr_offset, ptr_offset - bytes_reclaimed);
}
bool garbageCollect() {
// make a temporary clone and move assign
BasicJsonDocument tmp(*this);
if (!tmp.capacity())
return false;
tmp.set(*this);
moveAssignFrom(tmp);
return true;
}
using AllocatorOwner<TAllocator>::allocator;
private:
MemoryPool allocPool(size_t requiredSize) {
size_t capa = addPadding(requiredSize);
return MemoryPool(reinterpret_cast<char*>(this->allocate(capa)), capa);
}
void reallocPoolIfTooSmall(size_t requiredSize) {
if (requiredSize <= capacity())
return;
freePool();
replacePool(allocPool(addPadding(requiredSize)));
}
void freePool() {
this->deallocate(memoryPool().buffer());
}
void copyAssignFrom(const JsonDocument& src) {
reallocPoolIfTooSmall(src.capacity());
set(src);
}
void moveAssignFrom(BasicJsonDocument& src) {
freePool();
_data = src._data;
_pool = src._pool;
src._data.setNull();
src._pool = MemoryPool(0, 0);
}
};
} // namespace ARDUINOJSON_NAMESPACE
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