qgsxmlutils.h

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/***************************************************************************
    qgsxmlutils.h
    ---------------------
    begin                : December 2013
    copyright            : (C) 2013 by Martin Dobias
    email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   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 QGSXMLUTILS_H
#define QGSXMLUTILS_H
 
class QDomDocument;
 
class QgsRectangle;
class QgsBox3D;
 
#include "qgis.h"
#include "qgis_core.h"
#include "qgis_sip.h"
 
#include <QDomElement>
#include <QMetaEnum>

class CORE_EXPORT QgsXmlUtils
{
  public:
 
    /* reading */

    static Qgis::DistanceUnit readMapUnits( const QDomElement &element );
 
    static QgsRectangle readRectangle( const QDomElement &element );

    static QgsBox3D readBox3D( const QDomElement &element );
 
    /* writing */

    static QDomElement writeMapUnits( Qgis::DistanceUnit units, QDomDocument &doc );

    static QDomElement writeBox3D( const QgsBox3D &box, QDomDocument &doc, const QString &elementName = QStringLiteral( "extent3D" ) );

    static QDomElement writeRectangle( const QgsRectangle &rect, QDomDocument &doc, const QString &elementName = QStringLiteral( "extent" ) );

    static QDomElement writeVariant( const QVariant &value, QDomDocument &doc );

    static QVariant readVariant( const QDomElement &element );

    template<class T> static T readFlagAttribute( const QDomElement &element, const QString &attributeName, T defaultValue ) SIP_SKIP
    {
      T value = defaultValue;
      // Get source categories
      const QMetaEnum metaEnum = QMetaEnum::fromType<T>();
      const QString sourceCategoriesStr( element.attribute( attributeName, metaEnum.valueToKeys( static_cast<int>( defaultValue ) ) ) );
      if ( metaEnum.isValid() )
      {
        bool ok = false;
        const int newValue = metaEnum.keysToValue( sourceCategoriesStr.toUtf8().constData(), &ok );
        if ( ok )
          value = static_cast<T>( newValue );
      }
      return value;
    }
};
 
 
#endif // QGSXMLUTILS_H