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Move uniqueValues to QgsFeatureSource
Also change signature of QgsVectorLayer/QgsVectorDataProvider uniqueValues method to match (and improve API)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,42 @@ | ||
/*************************************************************************** | ||
qgsfeaturesource.cpp | ||
------------------- | ||
begin : May 2017 | ||
copyright : (C) 2017 by Nyall Dawson | ||
email : nyall dot dawson 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. * | ||
* * | ||
***************************************************************************/ | ||
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#include "qgsfeaturesource.h" | ||
#include "qgsfeaturerequest.h" | ||
#include "qgsfeatureiterator.h" | ||
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QSet<QVariant> QgsFeatureSource::uniqueValues( int fieldIndex, int limit ) const | ||
{ | ||
if ( fieldIndex < 0 || fieldIndex >= fields().count() ) | ||
return QSet<QVariant>(); | ||
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QgsFeatureRequest req; | ||
req.setFlags( QgsFeatureRequest::NoGeometry ); | ||
req.setSubsetOfAttributes( QgsAttributeList() << fieldIndex ); | ||
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QSet<QVariant> values; | ||
QgsFeatureIterator it = getFeatures( req ); | ||
QgsFeature f; | ||
while ( it.nextFeature( f ) ) | ||
{ | ||
values.insert( f.attribute( fieldIndex ) ); | ||
if ( limit > 0 && values.size() >= limit ) | ||
return values; | ||
} | ||
return values; | ||
} | ||
|
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