surveytargetexpressionevaluator.h

/*
    SPDX-FileCopyrightText: 2017 Volker Krause <vkrause@kde.org>
 
    SPDX-License-Identifier: MIT
*/
 
#ifndef KUSERFEEDBACK_SURVEYTARGETEXPRESSIONEVALUATOR_H
#define KUSERFEEDBACK_SURVEYTARGETEXPRESSIONEVALUATOR_H
 
#include <QHash>
 
QT_BEGIN_NAMESPACE
class QString;
class QVariant;
QT_END_NAMESPACE
 
namespace KUserFeedback {
 
class SurveyTargetExpression;
 
class SurveyTargetExpressionDataProvider
{
public:
    SurveyTargetExpressionDataProvider();
    virtual ~SurveyTargetExpressionDataProvider();
    virtual QVariant sourceData(const QString &sourceName) const = 0;
 
private:
    Q_DISABLE_COPY(SurveyTargetExpressionDataProvider)
};
 
class SurveyTargetExpressionEvaluator
{
public:
    SurveyTargetExpressionEvaluator();
    ~SurveyTargetExpressionEvaluator();
 
    void setDataProvider(const SurveyTargetExpressionDataProvider *provider);
 
    bool evaluate(SurveyTargetExpression *expression);
 
private:
    QVariant value(SurveyTargetExpression *expression);
    QVariant value(const QString &source);
 
    const SurveyTargetExpressionDataProvider *m_provider;
    QHash<QString, QVariant> m_dataCache;
};
 
}
 
#endif // KUSERFEEDBACK_SURVEYTARGETEXPRESSIONEVALUATOR_H