/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtAddOn.JsonStream module of the Qt.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
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** General Public License version 2.1 as published by the Free Software
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
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****************************************************************************/

#ifndef PRELAUNCHPROCESSBACKEND_H
#define PRELAUNCHPROCESSBACKEND_H

#include "qunixprocessbackend.h"
#include "qprocessmanager-global.h"

QT_BEGIN_NAMESPACE_PROCESSMANAGER

class QueuedSignal
{
public:
    enum SignalName { StateChanged, Started, Error, Finished };

    SignalName name;
    union {
        QProcess::ProcessError error;
        struct {
            int                   exitCode;
            QProcess::ExitStatus  exitStatus;
        } f;
        QProcess::ProcessState state;
    } n;
};

class Q_ADDON_PROCESSMANAGER_EXPORT QPrelaunchProcessBackend : public QUnixProcessBackend
{
    Q_OBJECT

public:
    QPrelaunchProcessBackend(const QProcessInfo& info, QObject *parent);
    virtual ~QPrelaunchProcessBackend();

    void prestart();
    void setInfo(const QProcessInfo& info);
    bool isReady() const;

    virtual void start();
    virtual QProcess::ProcessState state() const;

private slots:
    void handleProcessStarted();
    void handleProcessError(QProcess::ProcessError error);
    void handleProcessFinished(int exitCode, QProcess::ExitStatus exitStatus);
    void handleProcessStateChanged(QProcess::ProcessState state);

private:
    QList<QueuedSignal> m_queue;
    bool                m_started;
};

QT_END_NAMESPACE_PROCESSMANAGER

#endif // PRELAUNCHPROCESSBACKEND_H