QGIS » QGIS Application

bool QgsOracleFeatureIterator::prepareSimplification( const QgsSimplifyMethod& simplifyMethod )

{

  // setup simplification of geometries to fetch

  if ( !( mRequest.flags() & QgsFeatureRequest::NoGeometry ) &&

       simplifyMethod.methodType() != QgsSimplifyMethod::NoSimplification &&

       !simplifyMethod.forceLocalOptimization() )

  {

    QgsSimplifyMethod::MethodType methodType = simplifyMethod.methodType();

    if ( methodType == QgsSimplifyMethod::OptimizeForRendering || methodType == QgsSimplifyMethod::PreserveTopology )

    {

      return true;

    }

    else

    {

      QgsDebugMsg( QString( "Simplification method type (%1) is not recognised by OracleFeatureIterator" ).arg( methodType ) );

    }

  }

  return QgsAbstractFeatureIterator::prepareSimplification( simplifyMethod );

}

bool QgsOracleFeatureIterator::providerCanSimplify( QgsSimplifyMethod::MethodType methodType ) const

{

  return methodType == QgsSimplifyMethod::OptimizeForRendering || methodType == QgsSimplifyMethod::PreserveTopology;

}

      QString geom = QgsOracleProvider::quotedIdentifier( mSource->mGeometryColumn );

      if ( !mRequest.simplifyMethod().forceLocalOptimization() &&

           mRequest.simplifyMethod().methodType() != QgsSimplifyMethod::NoSimplification &&

           QGis::flatType( QGis::singleType( mSource->mRequestedGeomType != QGis::WKBUnknown

                                             ? mSource->mRequestedGeomType

                                             : mSource->mDetectedGeomType ) ) != QGis::WKBPoint )

      {

        if ( mRequest.simplifyMethod().methodType() == QgsSimplifyMethod::OptimizeForRendering )

        {

          geom = QString( "%1( %2, %3 )" )

               .arg( "SDO_UTIL.RECTIFY_GEOMETRY" )

               .arg( geom )

               .arg( mRequest.simplifyMethod().tolerance() * 0.8);

        }

        else

        {

          geom = QString( "%1( %2, %3, %4 )" )

               .arg( "SDO_UTIL.SIMPLIFY" )

               .arg( geom )

               .arg( mRequest.simplifyMethod().tolerance() * 0.8 )

               .arg( mRequest.simplifyMethod().tolerance() * 0.8 );

        }

      }

      query += geom;

    //! Setup the simplification of geometries to fetch using the specified simplify method

    virtual bool prepareSimplification( const QgsSimplifyMethod& simplifyMethod ) override;

  private:

    //! returns whether the iterator supports simplify geometries on provider side

    virtual bool providerCanSimplify( QgsSimplifyMethod::MethodType methodType ) const override;

  // supports geometry simplification on provider side

  mEnabledCapabilities |= ( QgsVectorDataProvider::SimplifyGeometries | QgsVectorDataProvider::SimplifyGeometriesWithTopologicalValidation );