qgsstoredexpressionmanager.h

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/***************************************************************************
                          qgsstoredexpressionmanager.h
                             -------------------
    begin                : August 2019
    copyright            : (C) 2019 David Signer
    email                : david at opengis dot ch
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSSTOREDEXPRESSIONMANAGER_H
#define QGSSTOREDEXPRESSIONMANAGER_H
 
#include "qgis_core.h"
#include "qgis_sip.h"
 
#include <QObject>
#include <QString>
#include <QUuid>
 
#ifdef SIP_RUN
% ModuleHeaderCode
#include <qgsstoredexpressionmanager.h>
% End
#endif
 
class QDomNode;
class QDomDocument;

class CORE_EXPORT QgsStoredExpression
{
  public:

    enum Category SIP_ENUM_BASETYPE( IntFlag )
    {
      FilterExpression        = 1 << 0, 
      DefaultValueExpression  = 1 << 1,  
      All                     = FilterExpression | DefaultValueExpression
    };
 
#ifndef SIP_RUN
 
    QgsStoredExpression() = default;

    QgsStoredExpression( const QString &name, const QString &expression, Category tag = Category::FilterExpression )
      : id( QUuid::createUuid().toString() )
      , name( name )
      , expression( expression )
      , tag( tag )
    {}
#endif

    QString id;
    QString name;
    QString expression;
    QgsStoredExpression::Category tag = QgsStoredExpression::Category::FilterExpression;
};

class CORE_EXPORT QgsStoredExpressionManager : public QObject
{
    Q_OBJECT
 
  public:
 
    QgsStoredExpressionManager() = default;

    QString addStoredExpression( const QString &name, const QString &expression, const QgsStoredExpression::Category &tag =  QgsStoredExpression::Category::FilterExpression );

    void removeStoredExpression( const QString &id );

    void updateStoredExpression( const QString &id, const QString &name, const QString &expression, const  QgsStoredExpression::Category &tag );

    void addStoredExpressions( const QList< QgsStoredExpression > &storedExpressions );

    QList< QgsStoredExpression > storedExpressions( const  QgsStoredExpression::Category &tag = QgsStoredExpression::Category::All );
 

    QgsStoredExpression storedExpression( const QString &id ) const;

    QgsStoredExpression findStoredExpressionByExpression( const QString &expression, const  QgsStoredExpression::Category &tag = QgsStoredExpression::Category::All ) const;

    void clearStoredExpressions();

    bool writeXml( QDomNode &layerNode ) const;

    bool readXml( const QDomNode &layerNode );
 
  signals:
 
  public slots:
 
  private:
    QList< QgsStoredExpression > mStoredExpressions;
};
 
#endif // QGSSTOREDEXPRESSIONMANAGER_H