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qgsfeaturerequest.cpp
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qgsfeaturerequest.cpp
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/***************************************************************************
qgsfeaturerequest.cpp
---------------------
begin : Mai 2012
copyright : (C) 2012 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. *
* *
***************************************************************************/
#include "qgsfeaturerequest.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include <QStringList>
QgsFeatureRequest::QgsFeatureRequest()
: mFilter( FilterNone )
, mFilterExpression( 0 )
, mFlags( 0 )
{
}
QgsFeatureRequest::QgsFeatureRequest( QgsFeatureId fid )
: mFilter( FilterFid )
, mFilterFid( fid )
, mFilterExpression( 0 )
, mFlags( 0 )
{
}
QgsFeatureRequest::QgsFeatureRequest( const QgsRectangle& rect )
: mFilter( FilterRect )
, mFilterRect( rect )
, mFilterExpression( 0 )
, mFlags( 0 )
{
}
QgsFeatureRequest::QgsFeatureRequest( const QgsExpression& expr )
: mFilter( FilterExpression )
, mFilterExpression( new QgsExpression( expr.expression() ) )
, mFlags( 0 )
{
}
QgsFeatureRequest::QgsFeatureRequest( const QgsFeatureRequest &rh )
{
operator=( rh );
}
QgsFeatureRequest& QgsFeatureRequest::operator=( const QgsFeatureRequest & rh )
{
mFlags = rh.mFlags;
mFilter = rh.mFilter;
mFilterRect = rh.mFilterRect;
mFilterFid = rh.mFilterFid;
mFilterFids = rh.mFilterFids;
if ( rh.mFilterExpression )
{
mFilterExpression = new QgsExpression( rh.mFilterExpression->expression() );
}
else
{
mFilterExpression = 0;
}
mAttrs = rh.mAttrs;
mSimplifyMethod = rh.mSimplifyMethod;
return *this;
}
QgsFeatureRequest::~QgsFeatureRequest()
{
delete mFilterExpression;
}
QgsFeatureRequest& QgsFeatureRequest::setFilterRect( const QgsRectangle& rect )
{
mFilter = FilterRect;
mFilterRect = rect;
return *this;
}
QgsFeatureRequest& QgsFeatureRequest::setFilterFid( QgsFeatureId fid )
{
mFilter = FilterFid;
mFilterFid = fid;
return *this;
}
QgsFeatureRequest&QgsFeatureRequest::setFilterFids( QgsFeatureIds fids )
{
mFilter = FilterFids;
mFilterFids = fids;
return *this;
}
QgsFeatureRequest& QgsFeatureRequest::setFilterExpression( const QString& expression )
{
mFilter = FilterExpression;
delete mFilterExpression;
mFilterExpression = new QgsExpression( expression );
return *this;
}
QgsFeatureRequest& QgsFeatureRequest::setFlags( QgsFeatureRequest::Flags flags )
{
mFlags = flags;
return *this;
}
QgsFeatureRequest& QgsFeatureRequest::setSubsetOfAttributes( const QgsAttributeList& attrs )
{
mFlags |= SubsetOfAttributes;
mAttrs = attrs;
return *this;
}
QgsFeatureRequest& QgsFeatureRequest::setSubsetOfAttributes( const QStringList& attrNames, const QgsFields& fields )
{
mFlags |= SubsetOfAttributes;
mAttrs.clear();
for ( int idx = 0; idx < fields.count(); ++idx )
{
if ( attrNames.contains( fields[idx].name() ) )
mAttrs.append( idx );
}
return *this;
}
QgsFeatureRequest& QgsFeatureRequest::setSimplifyMethod( const QgsSimplifyMethod& simplifyMethod )
{
mSimplifyMethod = simplifyMethod;
return *this;
}
bool QgsFeatureRequest::acceptFeature( const QgsFeature& feature )
{
switch ( mFilter )
{
case QgsFeatureRequest::FilterNone:
return true;
break;
case QgsFeatureRequest::FilterRect:
if ( feature.geometry() && feature.geometry()->intersects( mFilterRect ) )
return true;
else
return false;
break;
case QgsFeatureRequest::FilterFid:
if ( feature.id() == mFilterFid )
return true;
else
return false;
break;
case QgsFeatureRequest::FilterExpression:
if ( mFilterExpression->evaluate( feature ).toBool() )
return true;
else
return false;
break;
case QgsFeatureRequest::FilterFids:
if ( mFilterFids.contains( feature.id() ) )
return true;
else
return false;
break;
}
return true;
}