bool ossimTilingPoly::next(ossimRefPtr<ossimMapProjection>& resultProjection,
ossimIrect& resultingBounds,
ossimString& resultingName)
{
bool result = true;
if(theTileId < theTotalTiles)
{
ostringstream idString;
ossim_int64 tileId = theTileId + 1;
if (tileId < static_cast<ossim_int64>(m_features.size()))
{
idString << m_features[tileId].m_fid;
resultingName = theTileNameMask;
resultingName = resultingName.substitute("%f%", idString.str().c_str());
}
result = nextFeature();
resultingBounds = m_exteriorCut->getRectangle();
resultProjection = theMapProjection;
++theTileId;
}
else
{
result = false;
}
return result;
}
bool QgsVectorDataProvider::featureAtId( int featureId,
QgsFeature& feature,
bool fetchGeometry,
QgsAttributeList fetchAttributes )
{
select( fetchAttributes, QgsRectangle(), fetchGeometry );
while ( nextFeature( feature ) )
{
if ( feature.id() == featureId )
return true;
}
return false;
}
bool
QgsSqlAnywhereFeatureIterator::nextFeature( QgsFeature& feature )
{
if ( mClosed )
return false;
feature.setValid( false );
if ( !P->isValid() )
{
SaDebugMsg( "Read attempt on an invalid SQL Anywhere data source" );
return false;
}
if ( mStmt == NULL || !mStmt->isValid() )
{
SaDebugMsg( "nextFeature() called with invalid cursor()" );
return false;
}
return nextFeature( feature, mStmt );
}
void QgsVectorDataProvider::uniqueValues( int index, QList<QVariant> &values, int limit )
{
QgsFeature f;
QgsAttributeList keys;
keys.append( index );
select( keys, QgsRectangle(), false );
QSet<QString> set;
values.clear();
while ( nextFeature( f ) )
{
if ( !set.contains( f.attributeMap()[index].toString() ) )
{
values.append( f.attributeMap()[index] );
set.insert( f.attributeMap()[index].toString() );
}
if ( limit >= 0 && values.size() >= limit )
break;
}
}
void QgsAbstractFeatureIterator::setupOrderBy( const QList<QgsFeatureRequest::OrderByClause>& orderBys )
{
// Let the provider try using an efficient order by strategy first
if ( !orderBys.isEmpty() && !prepareOrderBy( orderBys ) )
{
// No success from the provider
// Prepare the expressions
QList<QgsFeatureRequest::OrderByClause> preparedOrderBys( orderBys );
QList<QgsFeatureRequest::OrderByClause>::iterator orderByIt( preparedOrderBys.begin() );
QgsExpressionContext* expressionContext( mRequest.expressionContext() );
do
{
orderByIt->expression().prepare( expressionContext );
}
while ( ++orderByIt != preparedOrderBys.end() );
// Fetch all features
QgsIndexedFeature indexedFeature;
indexedFeature.mIndexes.resize( preparedOrderBys.size() );
while ( nextFeature( indexedFeature.mFeature ) )
{
expressionContext->setFeature( indexedFeature.mFeature );
int i = 0;
Q_FOREACH ( const QgsFeatureRequest::OrderByClause& orderBy, preparedOrderBys )
{
indexedFeature.mIndexes.replace( i++, orderBy.expression().evaluate( expressionContext ) );
}
// We need all features, to ignore the limit for this pre-fetch
// keep the fetched count at 0.
mFetchedCount = 0;
mCachedFeatures.append( indexedFeature );
}
void QgsVectorDataProvider::fillMinMaxCache()
{
if ( !mCacheMinMaxDirty )
return;
const QgsFieldMap& flds = fields();
for ( QgsFieldMap::const_iterator it = flds.begin(); it != flds.end(); ++it )
{
if ( it->type() == QVariant::Int )
{
mCacheMinValues[it.key()] = QVariant( INT_MAX );
mCacheMaxValues[it.key()] = QVariant( INT_MIN );
}
else if ( it->type() == QVariant::Double )
{
mCacheMinValues[it.key()] = QVariant( DBL_MAX );
mCacheMaxValues[it.key()] = QVariant( -DBL_MAX );
}
else
{
mCacheMinValues[it.key()] = QVariant();
mCacheMaxValues[it.key()] = QVariant();
}
}
QgsFeature f;
QgsAttributeList keys = mCacheMinValues.keys();
select( keys, QgsRectangle(), false );
while ( nextFeature( f ) )
{
QgsAttributeMap attrMap = f.attributeMap();
for ( QgsAttributeList::const_iterator it = keys.begin(); it != keys.end(); ++it )
{
const QVariant& varValue = attrMap[*it];
if ( flds[*it].type() == QVariant::Int )
{
int value = varValue.toInt();
if ( value < mCacheMinValues[*it].toInt() )
mCacheMinValues[*it] = value;
if ( value > mCacheMaxValues[*it].toInt() )
mCacheMaxValues[*it] = value;
}
else if ( flds[*it].type() == QVariant::Double )
{
double value = varValue.toDouble();
if ( value < mCacheMinValues[*it].toDouble() )
mCacheMinValues[*it] = value;
if ( value > mCacheMaxValues[*it].toDouble() )
mCacheMaxValues[*it] = value;
}
else
{
QString value = varValue.toString();
if ( mCacheMinValues[*it].isNull() || value < mCacheMinValues[*it].toString() )
{
mCacheMinValues[*it] = value;
}
if ( mCacheMaxValues[*it].isNull() || value > mCacheMaxValues[*it].toString() )
{
mCacheMaxValues[*it] = value;
}
}
}
}
mCacheMinMaxDirty = false;
}
