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/******************************************************************************
*
* Project: GDAL
* Purpose: Class to abstract outputting to a vector layer
* Author: Even Rouault <even dot rouault at spatialys.com>
*
******************************************************************************
* Copyright (c) 2025, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "gdalalg_vector_output_abstract.h"
#include "cpl_vsi.h"
#include "ogrsf_frmts.h"
//! @cond Doxygen_Suppress
#ifndef _
#define _(x) (x)
#endif
GDALVectorOutputAbstractAlgorithm::~GDALVectorOutputAbstractAlgorithm() =
default;
/************************************************************************/
/* GDALVectorOutputAbstractAlgorithm::AddAllOutputArgs() */
/************************************************************************/
void GDALVectorOutputAbstractAlgorithm::AddAllOutputArgs()
{
AddOutputFormatArg(&m_outputFormat)
.AddMetadataItem(GAAMDI_REQUIRED_CAPABILITIES,
{GDAL_DCAP_VECTOR, GDAL_DCAP_CREATE});
AddOutputDatasetArg(&m_outputDataset, GDAL_OF_VECTOR)
.SetDatasetInputFlags(GADV_NAME | GADV_OBJECT);
AddCreationOptionsArg(&m_creationOptions);
AddLayerCreationOptionsArg(&m_layerCreationOptions);
AddOverwriteArg(&m_overwrite).SetMutualExclusionGroup("overwrite-update");
auto &updateArg =
AddUpdateArg(&m_update).SetMutualExclusionGroup("overwrite-update");
AddOverwriteLayerArg(&m_overwriteLayer);
AddArg("append", 0, _("Whether appending to existing layer is allowed"),
&m_appendLayer)
.SetDefault(false)
.AddAction([&updateArg] { updateArg.Set(true); });
{
auto &arg = AddOutputLayerNameArg(&m_outputLayerName)
.AddAlias("nln")
.SetMinCharCount(0);
if (!m_outputLayerName.empty())
arg.SetDefault(m_outputLayerName);
}
}
/************************************************************************/
/* GDALVectorOutputAbstractAlgorithm::SetupOutputDataset() */
/************************************************************************/
GDALVectorOutputAbstractAlgorithm::SetupOutputDatasetRet
GDALVectorOutputAbstractAlgorithm::SetupOutputDataset()
{
SetupOutputDatasetRet ret;
GDALDataset *poDstDS = m_outputDataset.GetDatasetRef();
std::unique_ptr<GDALDataset> poRetDS;
if (!poDstDS)
{
if (m_outputFormat.empty())
{
const auto aosFormats =
CPLStringList(GDALGetOutputDriversForDatasetName(
m_outputDataset.GetName().c_str(), GDAL_OF_VECTOR,
/* bSingleMatch = */ true,
/* bWarn = */ true));
if (aosFormats.size() != 1)
{
ReportError(CE_Failure, CPLE_AppDefined,
"Cannot guess driver for %s",
m_outputDataset.GetName().c_str());
return ret;
}
m_outputFormat = aosFormats[0];
}
auto poDriver =
GetGDALDriverManager()->GetDriverByName(m_outputFormat.c_str());
if (!poDriver)
{
// shouldn't happen given checks done in GDALAlgorithm
ReportError(CE_Failure, CPLE_AppDefined, "Cannot find driver %s",
m_outputFormat.c_str());
return ret;
}
poRetDS.reset(poDriver->Create(
m_outputDataset.GetName().c_str(), 0, 0, 0, GDT_Unknown,
CPLStringList(m_creationOptions).List()));
if (!poRetDS)
return ret;
poDstDS = poRetDS.get();
}
auto poDstDriver = poDstDS->GetDriver();
if (poDstDriver && EQUAL(poDstDriver->GetDescription(), "ESRI Shapefile") &&
EQUAL(CPLGetExtensionSafe(poDstDS->GetDescription()).c_str(), "shp") &&
poDstDS->GetLayerCount() <= 1)
{
m_outputLayerName = CPLGetBasenameSafe(poDstDS->GetDescription());
}
if (m_outputLayerName.empty() && poDstDS->GetLayerCount() == 1)
m_outputLayerName = poDstDS->GetLayer(0)->GetDescription();
auto poDstLayer = m_outputLayerName.empty()
? nullptr
: poDstDS->GetLayerByName(m_outputLayerName.c_str());
if (poDstLayer)
{
if (m_overwriteLayer)
{
int iLayer = -1;
const int nLayerCount = poDstDS->GetLayerCount();
for (iLayer = 0; iLayer < nLayerCount; iLayer++)
{
if (poDstDS->GetLayer(iLayer) == poDstLayer)
break;
}
if (iLayer < nLayerCount)
{
if (poDstDS->DeleteLayer(iLayer) != OGRERR_NONE)
{
ReportError(CE_Failure, CPLE_AppDefined,
"Cannot delete layer '%s'",
m_outputLayerName.c_str());
return ret;
}
}
poDstLayer = nullptr;
}
else if (!m_appendLayer)
{
ReportError(CE_Failure, CPLE_AppDefined,
"Layer '%s' already exists. Specify the "
"--%s option to overwrite it, or --%s "
"to append to it.",
m_outputLayerName.c_str(),
GDAL_ARG_NAME_OVERWRITE_LAYER, GDAL_ARG_NAME_APPEND);
return ret;
}
}
else if (m_appendLayer || m_overwriteLayer)
{
ReportError(CE_Failure, CPLE_AppDefined, "Cannot find layer '%s'",
m_outputLayerName.c_str());
return ret;
}
ret.newDS = std::move(poRetDS);
ret.outDS = poDstDS;
ret.layer = poDstLayer;
return ret;
}
/************************************************************************/
/* GDALVectorOutputAbstractAlgorithm::SetDefaultOutputLayerNameIfNeeded */
/************************************************************************/
bool GDALVectorOutputAbstractAlgorithm::SetDefaultOutputLayerNameIfNeeded(
GDALDataset *poOutDS)
{
if (m_outputLayerName.empty())
{
VSIStatBufL sStat;
auto poDriver = poOutDS->GetDriver();
if (VSIStatL(m_outputDataset.GetName().c_str(), &sStat) == 0 ||
(poDriver && EQUAL(poDriver->GetDescription(), "ESRI Shapefile")))
{
m_outputLayerName =
CPLGetBasenameSafe(m_outputDataset.GetName().c_str());
}
}
if (m_outputLayerName.empty())
{
ReportError(CE_Failure, CPLE_AppDefined,
"Argument 'layer' must be specified");
return false;
}
return true;
}
//! @endcond
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