dataretriever.h

/*
    SPDX-FileCopyrightText: 2001, 2002, 2003 Frerich Raabe <[email protected]>
 
    SPDX-License-Identifier: BSD-2-Clause
*/
 
#ifndef SYNDICATION_DATARETRIEVER_H
#define SYNDICATION_DATARETRIEVER_H
 
#include "syndication_export.h"
 
#include <QObject>
 
class QUrl;
 
class QByteArray;
 
namespace Syndication
{
/**
 * Abstract baseclass for all data retriever classes. Subclass this to add
 * a new retrieval algorithm which can then be plugged into the RSS loader.
 * @see Loader, FileRetriever, OutputRetriever
 */
class SYNDICATION_EXPORT DataRetriever : public QObject
{
    Q_OBJECT
public:
    /**
     * Default constructor.
     */
    DataRetriever();
 
    /**
     * Destructor.
     */
    ~DataRetriever() override;
 
    /**
     * Retrieve data from the given URL. This method is supposed to get
     * reimplemented by subclasses. It will be called by the Loader
     * class in case it needs to retrieve the data.
     *
     * @param url the URL to retrieve data from
     *
     * @see Loader::loadFrom()
     */
    virtual void retrieveData(const QUrl &url) = 0;
 
    /**
     * @return An error code which might give a more precise information
     * about what went wrong in case the 'success' flag returned with
     * the dataRetrieved() signal was 'false'. Note that the meaning of
     * the returned integer depends on the actual data retriever.
     */
    virtual int errorCode() const = 0;
 
    /**
     * aborts the retrieval process.
     */
    virtual void abort() = 0;
 
Q_SIGNALS:
    /**
     * Emit this signal to tell the Loader class that the retrieval
     * process was finished.
     * @param data Should contain the retrieved data and will get
     * parsed by the Loader class.
     * @param success Indicates whether there were any problems during
     * the retrieval process. Pass 'true' to indicate that everything
     * went seamlessy, 'false' to tell the Loader that something went
     * wrong and that the data parameter might contain no or invalid
     * data.
     */
 
    void dataRetrieved(const QByteArray &data, bool success);
 
private:
    DataRetriever(const DataRetriever &other);
    DataRetriever &operator=(const DataRetriever &other);
};
 
} // namespace Syndication
 
#endif // SYNDICATION_DATARETRIEVER_H