qgslayermetadataproviderregistry.cpp

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/***************************************************************************
  qgslayermetadataproviderregistry.cpp - QgsLayerMetadataProviderRegistry
 
 ---------------------
 begin                : 17.8.2022
 copyright            : (C) 2022 by Alessandro Pasotti
 email                : elpaso at itopen dot it
 ***************************************************************************
 *                                                                         *
 *   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 "qgslayermetadataproviderregistry.h"
#include "qgsabstractlayermetadataprovider.h"
#include "qgsfeedback.h"
 
QgsLayerMetadataProviderRegistry::QgsLayerMetadataProviderRegistry( QObject *parent )
  : QObject( parent )
{
 
}
 
void QgsLayerMetadataProviderRegistry::registerLayerMetadataProvider( QgsAbstractLayerMetadataProvider *metadataProvider )
{
  mMetadataProviders.insert( metadataProvider->id(), metadataProvider );
}
 
void QgsLayerMetadataProviderRegistry::unregisterLayerMetadataProvider( QgsAbstractLayerMetadataProvider *metadataProvider )
{
  delete mMetadataProviders.take( metadataProvider->id() );
}
 
QList<QgsAbstractLayerMetadataProvider *> QgsLayerMetadataProviderRegistry::layerMetadataProviders() const
{
  return mMetadataProviders.values();
}
 
QgsAbstractLayerMetadataProvider *QgsLayerMetadataProviderRegistry::layerMetadataProviderFromId( const QString &type )
{
  return mMetadataProviders.value( type, nullptr );
}
 
const QgsLayerMetadataSearchResults QgsLayerMetadataProviderRegistry::search( const QgsMetadataSearchContext &searchContext, const QString &searchString, const QgsRectangle &geographicExtent, QgsFeedback *feedback )
{
  QgsLayerMetadataSearchResults results;
  for ( auto it = mMetadataProviders.cbegin(); it != mMetadataProviders.cend(); ++it )
  {
 
    if ( feedback && feedback->isCanceled() )
    {
      break;
    }
 
    const QgsLayerMetadataSearchResults providerResults { it.value()->search( searchContext, searchString, geographicExtent ) };
    const QList<QgsLayerMetadataProviderResult> constMetadata { providerResults.metadata() };
    for ( const QgsLayerMetadataProviderResult &metadata : std::as_const( constMetadata ) )
    {
      results.addMetadata( metadata );
    }
    const QList<QString> constErrors { providerResults.errors() };
    for ( const QString &error : std::as_const( constErrors ) )
    {
      results.addError( error );
    }
  }
  return results;
}