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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 <QVariant>
#include <QByteArray>
#include <functional>
#include <flatbuffers/flatbuffers.h>
/**
* Defines how to convert qt primitives to flatbuffer ones
*/
template <class T>
flatbuffers::uoffset_t variantToProperty(const QVariant &, flatbuffers::FlatBufferBuilder &fbb);
/**
* Defines how to convert flatbuffer primitives to qt ones
*/
template <typename T>
QVariant propertyToVariant(const flatbuffers::String *);
template <typename T>
QVariant propertyToVariant(uint8_t);
/**
* 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.
*/
template<typename BufferType>
class ReadPropertyMapper
{
public:
virtual QVariant getProperty(const QByteArray &key, BufferType const *buffer) const
{
if (mReadAccessors.contains(key)) {
auto accessor = mReadAccessors.value(key);
return accessor(buffer);
}
return QVariant();
}
bool hasMapping(const QByteArray &key) const { return mReadAccessors.contains(key); }
QList<QByteArray> availableProperties() const { return mReadAccessors.keys(); }
void addMapping(const QByteArray &property, const std::function<QVariant(BufferType const *)> &mapping) {
mReadAccessors.insert(property, mapping);
}
template <typename T, typename Buffer>
void addMapping(const QByteArray &name, const flatbuffers::String *(Buffer::*f)() const)
{
addMapping(name, [f](Buffer const *buffer) -> QVariant {
return propertyToVariant<T>((buffer->*f)());
});
}
template <typename T, typename Buffer>
void addMapping(const QByteArray &name, uint8_t (Buffer::*f)() const)
{
addMapping(name, [f](Buffer const *buffer) -> QVariant {
return propertyToVariant<T>((buffer->*f)());
});
}
private:
QHash<QByteArray, std::function<QVariant(BufferType const *)> > mReadAccessors;
};
template<typename BufferBuilder>
class WritePropertyMapper
{
public:
virtual void setProperty(const QByteArray &key, const QVariant &value, QList<std::function<void(BufferBuilder &)> > &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 mWriteAccessors.contains(key); }
void addMapping(const QByteArray &property, const std::function<std::function<void(BufferBuilder &)>(const QVariant &, flatbuffers::FlatBufferBuilder &)> &mapping) {
mWriteAccessors.insert(property, mapping);
}
template <typename T>
void addMapping(const QByteArray &name, void (BufferBuilder::*f)(uint8_t))
{
addMapping(name, [f](const QVariant &value, flatbuffers::FlatBufferBuilder &fbb) -> std::function<void(BufferBuilder &)> {
return [value, f](BufferBuilder &builder) {
(builder.*f)(value.value<T>());
};
});
}
template <typename T>
void addMapping(const QByteArray &name, void (BufferBuilder::*f)(flatbuffers::Offset<flatbuffers::String>))
{
addMapping(name, [f](const QVariant &value, flatbuffers::FlatBufferBuilder &fbb) -> std::function<void(BufferBuilder &)> {
auto offset = variantToProperty<T>(value, fbb);
return [offset, f](BufferBuilder &builder) {
(builder.*f)(offset);
};
});
}
private:
QHash<QByteArray, std::function<std::function<void(BufferBuilder &)>(const QVariant &, flatbuffers::FlatBufferBuilder &)> > mWriteAccessors;
};
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