pagingmodel.h

#ifndef QTRESTCLIENT_PAGINGMODEL_H
#define QTRESTCLIENT_PAGINGMODEL_H
 
#include "QtRestClient/qtrestclient_global.h"
#include "QtRestClient/ipaging.h"
#include "QtRestClient/restreply.h"
#include "QtRestClient/restclass.h"
 
#ifndef Q_RESTCLIENT_NO_JSON_SERIALIZER
#include "QtRestClient/paging_fwd.h"
#include "QtRestClient/genericrestreply.h"
#endif
 
#include <QtCore/qabstractitemmodel.h>
#include <QtCore/qscopedpointer.h>
#include <QtCore/qpointer.h>
 
namespace QtRestClient {
 
class Q_RESTCLIENT_EXPORT IPagingModelFetcher
{
    Q_DISABLE_COPY(IPagingModelFetcher)
public:
    IPagingModelFetcher();
    virtual ~IPagingModelFetcher();
    virtual RestClient *client() const = 0;
    virtual RestReply *fetch(const QUrl &url) const = 0;
};
 
class PagingModelPrivate;
class Q_RESTCLIENT_EXPORT PagingModel : public QAbstractTableModel
{
    Q_OBJECT
 
    Q_PROPERTY(int typeId READ typeId NOTIFY typeIdChanged)
 
public:
    static constexpr int ModelDataRole = Qt::UserRole;
 
    explicit PagingModel(QObject *parent = nullptr);
 
    Q_INVOKABLE void initialize(const QUrl &initialUrl, QtRestClient::IPagingModelFetcher *fetcher, int typeId = QMetaType::UnknownType);
    Q_INVOKABLE void initialize(const QUrl &initialUrl, QtRestClient::RestClass *restClass, int typeId = QMetaType::UnknownType);
    Q_INVOKABLE void initialize(QtRestClient::RestReply *reply, QtRestClient::IPagingModelFetcher *fetcher, int typeId = QMetaType::UnknownType);
    Q_INVOKABLE void initialize(QtRestClient::RestReply *reply, QtRestClient::RestClass *restClass, int typeId = QMetaType::UnknownType);
    Q_INVOKABLE void initialize(QtRestClient::IPaging *paging, QtRestClient::IPagingModelFetcher *fetcher, int typeId = QMetaType::UnknownType);
    Q_INVOKABLE void initialize(QtRestClient::IPaging *paging, QtRestClient::RestClass *restClass, int typeId = QMetaType::UnknownType);
#ifndef Q_RESTCLIENT_NO_JSON_SERIALIZER
    template <typename T>
    inline void initialize(const QUrl &initialUrl, IPagingModelFetcher *fetcher);
    template <typename T>
    inline void initialize(const QUrl &initialUrl, RestClass *restClass);
    template <typename T>
    inline void initialize(const Paging<T> &paging, IPagingModelFetcher *fetcher);
    template <typename T>
    inline void initialize(const Paging<T> &paging, RestClass *restClass);
    template <typename DataClassType, typename ErrorClassType = QObject*>
    inline void initialize(GenericRestReply<Paging<DataClassType>, ErrorClassType> *reply, IPagingModelFetcher *fetcher);
    template <typename DataClassType, typename ErrorClassType = QObject*>
    inline void initialize(GenericRestReply<Paging<DataClassType>, ErrorClassType> *reply, RestClass *restClass);
#endif
 
    int typeId() const;
 
    QVariant headerData(int section, Qt::Orientation orientation = Qt::Horizontal, int role = Qt::DisplayRole) const override;
    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
    bool canFetchMore(const QModelIndex &parent) const override;
    void fetchMore(const QModelIndex &parent) override;
 
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
 
    Q_INVOKABLE QVariant object(const QModelIndex &index) const;
    template <typename T>
    inline T object(const QModelIndex &index) const;
 
    Qt::ItemFlags flags(const QModelIndex &index) const override;
    QHash<int, QByteArray> roleNames() const override;
 
    int addColumn(const QString &text);
    int addColumn(const QString &text, const char *propertyName);
    void addRole(int column, int role, const char *propertyName);
    void clearColumns();
 
Q_SIGNALS:
    void fetchError(QPrivateSignal);
 
    void typeIdChanged(int typeId, QPrivateSignal);
 
protected:
    explicit PagingModel(PagingModelPrivate &dd, QObject *parent = nullptr);
 
private:
    Q_DECLARE_PRIVATE(PagingModel)
};
 
class Q_RESTCLIENT_EXPORT RestClassFetcher : public IPagingModelFetcher
{
public:
    RestClassFetcher(RestClass *restClass);
    RestClient *client() const override;
    RestReply *fetch(const QUrl &url) const override;
 
private:
    QPointer<RestClass> _restClass;
};
 
// ------------- Generic implementation -------------
 
#ifndef Q_RESTCLIENT_NO_JSON_SERIALIZER
template<typename T>
inline void PagingModel::initialize(const QUrl &initialUrl, IPagingModelFetcher *fetcher)
{
    initialize(initialUrl, fetcher, qMetaTypeId<T>());
}
 
template<typename T>
inline void PagingModel::initialize(const QUrl &initialUrl, RestClass *restClass)
{
    initialize(initialUrl, restClass, qMetaTypeId<T>());
}
 
template<typename T>
inline void PagingModel::initialize(const Paging<T> &paging, IPagingModelFetcher *fetcher)
{
    initialize(paging.iPaging(), fetcher, qMetaTypeId<T>());
}
 
template<typename T>
inline void PagingModel::initialize(const Paging<T> &paging, RestClass *restClass)
{
    initialize(paging.iPaging(), restClass, qMetaTypeId<T>());
}
 
template<typename DataClassType, typename ErrorClassType>
inline void PagingModel::initialize(GenericRestReply<Paging<DataClassType>, ErrorClassType> *reply, IPagingModelFetcher *fetcher)
{
    initialize(reply, fetcher, qMetaTypeId<DataClassType>());
}
 
template<typename DataClassType, typename ErrorClassType>
inline void PagingModel::initialize(GenericRestReply<Paging<DataClassType>, ErrorClassType> *reply, RestClass *restClass)
{
    initialize(reply, restClass, qMetaTypeId<DataClassType>());
}
#endif
 
template <typename T>
inline T PagingModel::object(const QModelIndex &index) const
{
    Q_ASSERT_X(typeId() == QMetaType::UnknownType || qMetaTypeId<T>() == typeId(), Q_FUNC_INFO, "object must be used with the stores typeId");
    return object(index).value<T>();
}
 
}
 
Q_DECLARE_METATYPE(QtRestClient::IPagingModelFetcher*)
 
#endif // QTRESTCLIENT_PAGINGMODEL_H