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****************************************************************************/

#ifndef PatternistSDK_ErrorHandler_H
#define PatternistSDK_ErrorHandler_H

#include "Global.h"
#include "qabstractmessagehandler.h"


QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

template<typename T> class QList;

namespace QPatternistSDK
{
    /**
     * @short A MessageHandler which
     * accumulates all its received ErrorHandler::Message instances
     * in a list, retrievable via messages().
     *
     * Thus, ErrorHandler does not report errors, but collects them
     * and allows easy access to them.
     *
     * @ingroup PatternistSDK
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class Q_PATTERNISTSDK_EXPORT ErrorHandler : public QAbstractMessageHandler
    {
    public:
        class Message
        {
        public:
            typedef QList<Message> List;

            QString description() const
            {
                return m_description;
            }

            void setDescription(const QString &desc)
            {
                m_description = desc;
            }

            void setIdentifier(const QUrl &newId)
            {
                m_identifier = newId;
            }

            QUrl identifier() const
            {
                return m_identifier;
            }

            QtMsgType type() const
            {
                return m_type;
            }

            void setType(const QtMsgType t)
            {
                m_type = t;
            }

        private:
            QUrl        m_identifier;
            QtMsgType   m_type;
            QString     m_description;
        };

        /**
         * Clears all accumulated errors.
         */
        void reset();

        Message::List messages() const;

        /**
         * Calling this function causes all Qt's internal debug messages to be
         * sent to @p handler. If @p handler is @c null, Qt's default message
         * handler is re-installed. In other words, via an internal proxy function,
         * it installs @p handler as Qt's message handler.
         *
         * If @p handler is heap allocated, it will be leaked.
         *
         * @see qInstallMsgHandler()
         */
        static void installQtMessageHandler(ErrorHandler *const handler);

        static ErrorHandler *handler;

    protected:
        virtual void handleMessage(QtMsgType type,
                                   const QString &description,
                                   const QUrl &identifier = QUrl(),
                                   const QSourceLocation &sourceLocation = QSourceLocation());

    private:
        ErrorHandler::Message::List m_messages;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif
// vim: et:ts=4:sw=4:sts=4