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/*
* Copyright (C) 2014 Christian Mollekopf <chrigi_1@fastmail.fm>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include "sink_export.h"
#include <QVariant>
#include <QByteArray>
#include <functional>
#include <flatbuffers/flatbuffers.h>
namespace Sink {
namespace ApplicationDomain {
namespace Buffer {
struct MailContact;
struct ContactEmail;
}
}
}
/**
* Defines how to convert qt primitives to flatbuffer ones
*/
template <class T>
flatbuffers::uoffset_t SINK_EXPORT variantToProperty(const QVariant &, flatbuffers::FlatBufferBuilder &fbb);
/**
* Defines how to convert flatbuffer primitives to qt ones
*/
template <typename T>
QVariant SINK_EXPORT propertyToVariant(const flatbuffers::String *);
template <typename T>
QVariant SINK_EXPORT propertyToVariant(uint8_t);
template <typename T>
QVariant SINK_EXPORT propertyToVariant(int);
template <typename T>
QVariant SINK_EXPORT propertyToVariant(const flatbuffers::Vector<uint8_t> *);
template <typename T>
QVariant SINK_EXPORT propertyToVariant(const flatbuffers::Vector<flatbuffers::Offset<flatbuffers::String>> *);
template <typename T>
QVariant SINK_EXPORT propertyToVariant(const Sink::ApplicationDomain::Buffer::MailContact *);
template <typename T>
QVariant SINK_EXPORT propertyToVariant(const flatbuffers::Vector<flatbuffers::Offset<Sink::ApplicationDomain::Buffer::MailContact>> *);
template <typename T>
QVariant SINK_EXPORT propertyToVariant(const flatbuffers::Vector<flatbuffers::Offset<Sink::ApplicationDomain::Buffer::ContactEmail>> *);
/**
* The property mapper is a non-typesafe virtual dispatch.
*
* Instead of using an interface and requring each implementation to override
* a virtual method per property, the property mapper can be filled with accessors
* that extract the properties from resource types.
*/
class PropertyMapper
{
public:
virtual ~PropertyMapper(){};
template <typename T, typename Buffer, typename BufferBuilder, typename FunctionReturnValue, typename Arg>
void addMapping(FunctionReturnValue (Buffer::*f)() const, void (BufferBuilder::*f2)(Arg))
{
addReadMapping<T, Buffer, FunctionReturnValue>(f);
addWriteMapping<T, BufferBuilder>(f2);
}
virtual QVariant getProperty(const QByteArray &key, void const *buffer) const
{
if (mReadAccessors.contains(key)) {
auto accessor = mReadAccessors.value(key);
return accessor(buffer);
}
return QVariant();
}
virtual void setProperty(const QByteArray &key, const QVariant &value, QList<std::function<void(void *builder)>> &builderCalls, flatbuffers::FlatBufferBuilder &fbb) const
{
if (mWriteAccessors.contains(key)) {
auto accessor = mWriteAccessors.value(key);
builderCalls << accessor(value, fbb);
}
}
bool hasMapping(const QByteArray &key) const
{
return mReadAccessors.contains(key);
}
QList<QByteArray> availableProperties() const
{
return mReadAccessors.keys();
}
private:
void addReadMapping(const QByteArray &property, const std::function<QVariant(void const *)> &mapping)
{
mReadAccessors.insert(property, mapping);
}
template <typename T, typename Buffer, typename FunctionReturnValue>
void addReadMapping(FunctionReturnValue (Buffer::*f)() const)
{
addReadMapping(T::name, [f](void const *buffer) -> QVariant { return propertyToVariant<typename T::Type>((static_cast<const Buffer*>(buffer)->*f)()); });
}
void addWriteMapping(const QByteArray &property, const std::function<std::function<void(void *builder)>(const QVariant &, flatbuffers::FlatBufferBuilder &)> &mapping)
{
mWriteAccessors.insert(property, mapping);
}
template <typename T, typename BufferBuilder>
void addWriteMapping(void (BufferBuilder::*f)(uint8_t))
{
addWriteMapping(T::name, [f](const QVariant &value, flatbuffers::FlatBufferBuilder &fbb) -> std::function<void(void *builder)> {
return [value, f](void *builder) { (static_cast<BufferBuilder*>(builder)->*f)(value.value<typename T::Type>()); };
});
}
template <typename T, typename BufferBuilder>
void addWriteMapping(void (BufferBuilder::*f)(int))
{
addWriteMapping(T::name, [f](const QVariant &value, flatbuffers::FlatBufferBuilder &fbb) -> std::function<void(void *builder)> {
return [value, f](void *builder) { (static_cast<BufferBuilder*>(builder)->*f)(value.value<typename T::Type>()); };
});
}
template <typename T, typename BufferBuilder>
void addWriteMapping(void (BufferBuilder::*f)(bool))
{
addWriteMapping(T::name, [f](const QVariant &value, flatbuffers::FlatBufferBuilder &fbb) -> std::function<void(void *builder)> {
return [value, f](void *builder) { (static_cast<BufferBuilder*>(builder)->*f)(value.value<typename T::Type>()); };
});
}
template <typename T, typename BufferBuilder, typename Arg>
void addWriteMapping(void (BufferBuilder::*f)(flatbuffers::Offset<Arg>))
{
addWriteMapping(T::name, [f](const QVariant &value, flatbuffers::FlatBufferBuilder &fbb) -> std::function<void(void *builder)> {
auto offset = variantToProperty<typename T::Type>(value, fbb);
return [offset, f](void *builder) { (static_cast<BufferBuilder*>(builder)->*f)(offset); };
});
}
QHash<QByteArray, std::function<QVariant(void const *)>> mReadAccessors;
QHash<QByteArray, std::function<std::function<void(void *builder)>(const QVariant &, flatbuffers::FlatBufferBuilder &)>> mWriteAccessors;
};
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