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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 "entity_generated.h"
#include <QVariant>
#include <QByteArray>
#include <functional>
#include "clientapi.h" //for domain parts
#include "event_generated.h"
#include "entity_generated.h"
#include "metadata_generated.h"
#include "entitybuffer.h"
/**
* 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);
}
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);
}
private:
QHash<QByteArray, std::function<std::function<void(BufferBuilder &)>(const QVariant &, flatbuffers::FlatBufferBuilder &)> > mWriteAccessors;
};
/**
* A generic adaptor implementation that uses a property mapper to read/write values.
*
* TODO: this is the read-only part. Create a write only equivalent
*/
template <class LocalBuffer, class ResourceBuffer>
class GenericBufferAdaptor : public Akonadi2::ApplicationDomain::BufferAdaptor
{
public:
GenericBufferAdaptor()
: BufferAdaptor()
{
}
//TODO remove
void setProperty(const QByteArray &key, const QVariant &value)
{
// if (mResourceMapper && mResourceMapper->hasMapping(key)) {
// // mResourceMapper->setProperty(key, value, mResourceBuffer);
// } else {
// // mLocalMapper.;
// }
}
virtual QVariant getProperty(const QByteArray &key) const
{
if (mResourceBuffer && mResourceMapper->hasMapping(key)) {
return mResourceMapper->getProperty(key, mResourceBuffer);
} else if (mLocalBuffer && mLocalMapper->hasMapping(key)) {
return mLocalMapper->getProperty(key, mLocalBuffer);
}
qWarning() << "no mapping available for key " << key;
return QVariant();
}
virtual QList<QByteArray> availableProperties() const
{
QList<QByteArray> props;
props << mResourceMapper->availableProperties();
props << mLocalMapper->availableProperties();
return props;
}
LocalBuffer const *mLocalBuffer;
ResourceBuffer const *mResourceBuffer;
QSharedPointer<ReadPropertyMapper<LocalBuffer> > mLocalMapper;
QSharedPointer<ReadPropertyMapper<ResourceBuffer> > mResourceMapper;
};
/**
* A generic adaptor implementation that uses a property mapper to read/write values.
*/
template <class LocalBuilder, class ResourceBuilder>
class GenericWriteBufferAdaptor : public Akonadi2::ApplicationDomain::BufferAdaptor
{
public:
GenericWriteBufferAdaptor(const BufferAdaptor &buffer)
: BufferAdaptor()
{
for(const auto &property : buffer.availableProperties()) {
setProperty(property, buffer.getProperty(property));
}
}
void setProperty(const QByteArray &key, const QVariant &value)
{
// if (mResourceMapper && mResourceMapper->hasMapping(key)) {
// // mResourceMapper->setProperty(key, value, mResourceBuffer);
// } else {
// // mLocalMapper.;
// }
}
//TODO remove
virtual QVariant getProperty(const QByteArray &key) const
{
Q_ASSERT(false);
}
virtual QList<QByteArray> availableProperties() const
{
Q_ASSERT(false);
QList<QByteArray> props;
return props;
}
// LocalBuffer const *mLocalBuffer;
// ResourceBuffer const *mResourceBuffer;
QSharedPointer<WritePropertyMapper<LocalBuilder> > mLocalMapper;
QSharedPointer<WritePropertyMapper<ResourceBuilder> > mResourceMapper;
};
/**
* Initializes the local property mapper.
*
* Provide an implementation for each application domain type.
*/
template <class T>
QSharedPointer<ReadPropertyMapper<T> > initializeReadPropertyMapper();
/**
* The factory should define how to go from an entitybuffer (local + resource buffer), to a domain type adapter.
* It defines how values are split accross local and resource buffer.
* This is required by the facade the read the value, and by the pipeline preprocessors to access the domain values in a generic way.
*/
template<typename DomainType, typename LocalBuffer, typename ResourceBuffer>
class DomainTypeAdaptorFactory
{
public:
DomainTypeAdaptorFactory() : mLocalMapper(initializeReadPropertyMapper<LocalBuffer>()) {};
virtual ~DomainTypeAdaptorFactory() {};
/**
* Creates an adaptor for the given domain and resource types.
*
* This returns by default a GenericBufferAdaptor initialized with the corresponding property mappers.
*/
virtual QSharedPointer<Akonadi2::ApplicationDomain::BufferAdaptor> createAdaptor(const Akonadi2::Entity &entity)
{
const auto resourceBuffer = Akonadi2::EntityBuffer::readBuffer<ResourceBuffer>(entity.resource());
const auto localBuffer = Akonadi2::EntityBuffer::readBuffer<LocalBuffer>(entity.local());
// const auto metadataBuffer = Akonadi2::EntityBuffer::readBuffer<Akonadi2::Metadata>(entity.metadata());
auto adaptor = QSharedPointer<GenericBufferAdaptor<LocalBuffer, ResourceBuffer> >::create();
adaptor->mLocalBuffer = localBuffer;
adaptor->mLocalMapper = mLocalMapper;
adaptor->mResourceBuffer = resourceBuffer;
adaptor->mResourceMapper = mResourceMapper;
return adaptor;
}
virtual void createBuffer(const Akonadi2::ApplicationDomain::Event &event, flatbuffers::FlatBufferBuilder &fbb) {};
protected:
QSharedPointer<ReadPropertyMapper<LocalBuffer> > mLocalMapper;
QSharedPointer<ReadPropertyMapper<ResourceBuffer> > mResourceMapper;
};
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