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qgsafsshareddata.cpp
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qgsafsshareddata.cpp
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/***************************************************************************
qgsafsshareddata.cpp
---------------------
begin : June 2017
copyright : (C) 2017 by Sandro Mani
email : manisandro 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 "qgsafsshareddata.h"
#include "qgsarcgisrestutils.h"
#include "qgslogger.h"
void QgsAfsSharedData::clearCache()
{
QMutexLocker locker( &mMutex );
mCache.clear();
}
bool QgsAfsSharedData::getFeature( QgsFeatureId id, QgsFeature &f, const QgsRectangle &filterRect, QgsFeedback *feedback )
{
QMutexLocker locker( &mMutex );
// If cached, return cached feature
QMap<QgsFeatureId, QgsFeature>::const_iterator it = mCache.constFind( id );
if ( it != mCache.constEnd() )
{
f = it.value();
return filterRect.isNull() || ( f.hasGeometry() && f.geometry().intersects( filterRect ) );
}
// When fetching from server, fetch all attributes and geometry by default so that we can cache them
QStringList fetchAttribNames;
QList<int> fetchAttribIdx;
fetchAttribIdx.reserve( mFields.size() );
for ( int idx = 0, n = mFields.size(); idx < n; ++idx )
{
fetchAttribNames.append( mFields.at( idx ).name() );
fetchAttribIdx.append( idx );
}
// Fetch 100 features at the time
int startId = ( id / 100 ) * 100;
int stopId = std::min( startId + 100, mObjectIds.length() );
QList<quint32> objectIds;
objectIds.reserve( stopId );
for ( int i = startId; i < stopId; ++i )
{
if ( i >= 0 && i < mObjectIds.count() )
objectIds.append( mObjectIds[i] );
}
if ( objectIds.empty() )
{
QgsDebugMsg( "No valid features IDs to fetch" );
return false;
}
// don't lock while doing the fetch
locker.unlock();
// Query
QString errorTitle, errorMessage;
const QVariantMap queryData = QgsArcGisRestUtils::getObjects(
mDataSource.param( QStringLiteral( "url" ) ), objectIds, mDataSource.param( QStringLiteral( "crs" ) ), true,
fetchAttribNames, QgsWkbTypes::hasM( mGeometryType ), QgsWkbTypes::hasZ( mGeometryType ),
filterRect, errorTitle, errorMessage, feedback );
if ( queryData.isEmpty() )
{
// const_cast<QgsAfsProvider *>( this )->pushError( errorTitle + ": " + errorMessage );
QgsDebugMsg( "Query returned empty result" );
return false;
}
// but re-lock while updating cache
locker.relock();
const QVariantList featuresData = queryData[QStringLiteral( "features" )].toList();
if ( featuresData.isEmpty() )
{
QgsDebugMsgLevel( "Query returned no features", 3 );
return false;
}
for ( int i = 0, n = featuresData.size(); i < n; ++i )
{
const QVariantMap featureData = featuresData[i].toMap();
QgsFeature feature;
int featureId = startId + i;
// Set attributes
if ( !fetchAttribIdx.isEmpty() )
{
const QVariantMap attributesData = featureData[QStringLiteral( "attributes" )].toMap();
feature.setFields( mFields );
QgsAttributes attributes( mFields.size() );
foreach ( int idx, fetchAttribIdx )
{
QVariant attribute = attributesData[mFields.at( idx ).name()];
if ( attribute.isNull() )
{
// ensure that null values are mapped correctly for PyQGIS
attribute = QVariant( QVariant::Int );
}
mFields.at( idx ).convertCompatible( attribute );
attributes[idx] = attribute;
if ( mFields.at( idx ).name() == QStringLiteral( "OBJECTID" ) )
{
featureId = startId + objectIds.indexOf( attributesData[mFields.at( idx ).name()].toInt() );
}
}
feature.setAttributes( attributes );
}
// Set FID
feature.setId( featureId );
// Set geometry
const QVariantMap geometryData = featureData[QStringLiteral( "geometry" )].toMap();
std::unique_ptr< QgsAbstractGeometry > geometry = QgsArcGisRestUtils::parseEsriGeoJSON( geometryData, queryData[QStringLiteral( "geometryType" )].toString(),
QgsWkbTypes::hasM( mGeometryType ), QgsWkbTypes::hasZ( mGeometryType ) );
// Above might return 0, which is OK since in theory empty geometries are allowed
if ( geometry )
feature.setGeometry( QgsGeometry( std::move( geometry ) ) );
feature.setValid( true );
mCache.insert( feature.id(), feature );
}
// If added to cache, return feature
it = mCache.constFind( id );
if ( it != mCache.constEnd() )
{
f = it.value();
return filterRect.isNull() || ( f.hasGeometry() && f.geometry().intersects( filterRect ) );
}
return false;
}
QgsFeatureIds QgsAfsSharedData::getFeatureIdsInExtent( const QgsRectangle &extent, QgsFeedback *feedback )
{
QString errorTitle;
QString errorText;
const QList<quint32> featuresInRect = QgsArcGisRestUtils::getObjectIdsByExtent( mDataSource.param( QStringLiteral( "url" ) ),
mObjectIdFieldName,
extent, errorTitle, errorText, feedback );
QgsFeatureIds ids;
for ( quint32 id : featuresInRect )
{
int featureId = mObjectIds.indexOf( id );
if ( featureId >= 0 )
ids.insert( featureId );
}
return ids;
}