qgsrasterlayertemporalproperties.cpp

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/***************************************************************************
                         qgsrasterlayertemporalproperties.cpp
                         ---------------
    begin                : February 2020
    copyright            : (C) 2020 by Samweli Mwakisambwe
    email                : samweli at kartoza 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 "qgsrasterlayertemporalproperties.h"
#include "qgsrasterdataprovidertemporalcapabilities.h"
#include "qgsrasterlayer.h"
 
QgsRasterLayerTemporalProperties::QgsRasterLayerTemporalProperties( QObject *parent, bool enabled )
  :  QgsMapLayerTemporalProperties( parent, enabled )
{
}
 
bool QgsRasterLayerTemporalProperties::isVisibleInTemporalRange( const QgsDateTimeRange &range ) const
{
  if ( !isActive() )
    return true;
 
  switch ( mMode )
  {
    case ModeFixedTemporalRange:
      return range.isInfinite() || mFixedRange.isInfinite() || mFixedRange.overlaps( range );
 
    case ModeTemporalRangeFromDataProvider:
      return true;
  }
  return true;
}
 
QgsDateTimeRange QgsRasterLayerTemporalProperties::calculateTemporalExtent( QgsMapLayer *layer ) const
{
  QgsRasterLayer *rasterLayer = qobject_cast< QgsRasterLayer *>( layer );
  if ( !rasterLayer )
    return QgsDateTimeRange();
 
  switch ( mMode )
  {
    case QgsRasterLayerTemporalProperties::ModeFixedTemporalRange:
      return mFixedRange;
 
    case QgsRasterLayerTemporalProperties::ModeTemporalRangeFromDataProvider:
      return rasterLayer->dataProvider()->temporalCapabilities()->availableTemporalRange();
  }
 
  return QgsDateTimeRange();
}
 
QgsRasterLayerTemporalProperties::TemporalMode QgsRasterLayerTemporalProperties::mode() const
{
  return mMode;
}
 
void QgsRasterLayerTemporalProperties::setMode( QgsRasterLayerTemporalProperties::TemporalMode mode )
{
  if ( mMode == mode )
    return;
  mMode = mode;
}
 
QgsTemporalProperty::Flags QgsRasterLayerTemporalProperties::flags() const
{
  return mode() == ModeFixedTemporalRange ? QgsTemporalProperty::FlagDontInvalidateCachedRendersWhenRangeChanges : QgsTemporalProperty::Flags();
}
 
QgsRasterDataProviderTemporalCapabilities::IntervalHandlingMethod QgsRasterLayerTemporalProperties::intervalHandlingMethod() const
{
  return mIntervalHandlingMethod;
}
 
void QgsRasterLayerTemporalProperties::setIntervalHandlingMethod( QgsRasterDataProviderTemporalCapabilities::IntervalHandlingMethod method )
{
  if ( mIntervalHandlingMethod == method )
    return;
  mIntervalHandlingMethod = method;
}
 
void  QgsRasterLayerTemporalProperties::setFixedTemporalRange( const QgsDateTimeRange &range )
{
  mFixedRange = range;
}
 
const QgsDateTimeRange &QgsRasterLayerTemporalProperties::fixedTemporalRange() const
{
  return mFixedRange;
}
 
bool QgsRasterLayerTemporalProperties::readXml( const QDomElement &element, const QgsReadWriteContext &context )
{
  Q_UNUSED( context )
  // TODO add support for raster layers with multi-temporal properties.
 
  QDomElement temporalNode = element.firstChildElement( QStringLiteral( "temporal" ) );
 
  setIsActive( temporalNode.attribute( QStringLiteral( "enabled" ), QStringLiteral( "0" ) ).toInt() );
 
  mMode = static_cast< TemporalMode >( temporalNode.attribute( QStringLiteral( "mode" ), QStringLiteral( "0" ) ). toInt() );
  mIntervalHandlingMethod = static_cast< QgsRasterDataProviderTemporalCapabilities::IntervalHandlingMethod >( temporalNode.attribute( QStringLiteral( "fetchMode" ), QStringLiteral( "0" ) ). toInt() );
 
  QDomNode rangeElement = temporalNode.namedItem( QStringLiteral( "fixedRange" ) );
 
  QDomNode begin = rangeElement.namedItem( QStringLiteral( "start" ) );
  QDomNode end = rangeElement.namedItem( QStringLiteral( "end" ) );
 
  QDateTime beginDate = QDateTime::fromString( begin.toElement().text(), Qt::ISODate );
  QDateTime endDate = QDateTime::fromString( end.toElement().text(), Qt::ISODate );
 
  QgsDateTimeRange range = QgsDateTimeRange( beginDate, endDate );
  setFixedTemporalRange( range );
 
  return true;
}
 
QDomElement QgsRasterLayerTemporalProperties::writeXml( QDomElement &element, QDomDocument &document, const QgsReadWriteContext &context )
{
  Q_UNUSED( context )
  if ( element.isNull() )
    return QDomElement();
 
  QDomElement temporalElement = document.createElement( QStringLiteral( "temporal" ) );
  temporalElement.setAttribute( QStringLiteral( "enabled" ), isActive() ? QStringLiteral( "1" ) : QStringLiteral( "0" ) );
  temporalElement.setAttribute( QStringLiteral( "mode" ), QString::number( mMode ) );
  temporalElement.setAttribute( QStringLiteral( "fetchMode" ), QString::number( mIntervalHandlingMethod ) );
 
  QDomElement rangeElement = document.createElement( QStringLiteral( "fixedRange" ) );
 
  QDomElement startElement = document.createElement( QStringLiteral( "start" ) );
  QDomElement endElement = document.createElement( QStringLiteral( "end" ) );
 
  QDomText startText = document.createTextNode( mFixedRange.begin().toTimeSpec( Qt::OffsetFromUTC ).toString( Qt::ISODate ) );
  QDomText endText = document.createTextNode( mFixedRange.end().toTimeSpec( Qt::OffsetFromUTC ).toString( Qt::ISODate ) );
  startElement.appendChild( startText );
  endElement.appendChild( endText );
  rangeElement.appendChild( startElement );
  rangeElement.appendChild( endElement );
 
  temporalElement.appendChild( rangeElement );
 
  element.appendChild( temporalElement );
 
  return element;
}
 
void QgsRasterLayerTemporalProperties::setDefaultsFromDataProviderTemporalCapabilities( const QgsDataProviderTemporalCapabilities *capabilities )
{
  if ( const QgsRasterDataProviderTemporalCapabilities *rasterCaps = dynamic_cast< const QgsRasterDataProviderTemporalCapabilities *>( capabilities ) )
  {
    setIsActive( rasterCaps->hasTemporalCapabilities() );
    setFixedTemporalRange( rasterCaps->availableTemporalRange() );
 
    if ( rasterCaps->hasTemporalCapabilities() )
    {
      setMode( ModeTemporalRangeFromDataProvider );
    }
 
    mIntervalHandlingMethod = rasterCaps->intervalHandlingMethod();
  }
}