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/******************************************************************************
*
* Project: GDAL
* Purpose: "read" step of "vector pipeline"
* Author: Even Rouault <even dot rouault at spatialys.com>
*
******************************************************************************
* Copyright (c) 2024, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "gdalalg_vector_read.h"
#include "gdal_priv.h"
#include "ogrsf_frmts.h"
//! @cond Doxygen_Suppress
#ifndef _
#define _(x) (x)
#endif
/************************************************************************/
/* GDALVectorReadAlgorithm::GDALVectorReadAlgorithm() */
/************************************************************************/
GDALVectorReadAlgorithm::GDALVectorReadAlgorithm()
: GDALVectorPipelineStepAlgorithm(NAME, DESCRIPTION, HELP_URL,
/* standaloneStep =*/false)
{
AddVectorInputArgs(/* hiddenForCLI = */ false);
}
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset */
/************************************************************************/
/** Class used by vector pipeline steps to create an output on-the-fly
* dataset where they can store on-the-fly layers.
*/
class GDALVectorPipelineReadOutputDataset final : public GDALDataset
{
GDALDataset &m_srcDS;
std::vector<OGRLayer *> m_layers{};
CPL_DISALLOW_COPY_ASSIGN(GDALVectorPipelineReadOutputDataset)
public:
explicit GDALVectorPipelineReadOutputDataset(GDALDataset &oSrcDS);
void AddLayer(OGRLayer &oSrcLayer);
int GetLayerCount() const override;
OGRLayer *GetLayer(int idx) const override;
int TestCapability(const char *pszCap) const override;
void ResetReading() override;
OGRFeature *GetNextFeature(OGRLayer **ppoBelongingLayer,
double *pdfProgressPct,
GDALProgressFunc pfnProgress,
void *pProgressData) override;
};
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset() */
/************************************************************************/
GDALVectorPipelineReadOutputDataset::GDALVectorPipelineReadOutputDataset(
GDALDataset &srcDS)
: m_srcDS(srcDS)
{
SetDescription(m_srcDS.GetDescription());
}
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset::AddLayer() */
/************************************************************************/
void GDALVectorPipelineReadOutputDataset::AddLayer(OGRLayer &oSrcLayer)
{
m_layers.push_back(&oSrcLayer);
}
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset::GetLayerCount() */
/************************************************************************/
int GDALVectorPipelineReadOutputDataset::GetLayerCount() const
{
return static_cast<int>(m_layers.size());
}
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset::GetLayer() */
/************************************************************************/
OGRLayer *GDALVectorPipelineReadOutputDataset::GetLayer(int idx) const
{
return idx >= 0 && idx < GetLayerCount() ? m_layers[idx] : nullptr;
}
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset::TestCapability() */
/************************************************************************/
int GDALVectorPipelineReadOutputDataset::TestCapability(
const char *pszCap) const
{
if (EQUAL(pszCap, ODsCRandomLayerRead))
return m_srcDS.TestCapability(pszCap);
return false;
}
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset::ResetReading() */
/************************************************************************/
void GDALVectorPipelineReadOutputDataset::ResetReading()
{
m_srcDS.ResetReading();
}
/************************************************************************/
/* GDALVectorPipelineReadOutputDataset::GetNextFeature() */
/************************************************************************/
OGRFeature *GDALVectorPipelineReadOutputDataset::GetNextFeature(
OGRLayer **ppoBelongingLayer, double *pdfProgressPct,
GDALProgressFunc pfnProgress, void *pProgressData)
{
while (true)
{
OGRLayer *poBelongingLayer = nullptr;
auto poFeature = std::unique_ptr<OGRFeature>(m_srcDS.GetNextFeature(
&poBelongingLayer, pdfProgressPct, pfnProgress, pProgressData));
if (ppoBelongingLayer)
*ppoBelongingLayer = poBelongingLayer;
if (!poFeature)
break;
if (std::find(m_layers.begin(), m_layers.end(), poBelongingLayer) !=
m_layers.end())
return poFeature.release();
}
return nullptr;
}
/************************************************************************/
/* GDALVectorReadAlgorithm::RunStep() */
/************************************************************************/
bool GDALVectorReadAlgorithm::RunStep(GDALPipelineStepRunContext &)
{
auto poSrcDS = m_inputDataset[0].GetDatasetRef();
CPLAssert(poSrcDS);
CPLAssert(m_outputDataset.GetName().empty());
CPLAssert(!m_outputDataset.GetDatasetRef());
if (m_inputLayerNames.empty())
{
m_outputDataset.Set(poSrcDS);
}
else
{
auto poOutDS =
std::make_unique<GDALVectorPipelineReadOutputDataset>(*poSrcDS);
for (const auto &srcLayerName : m_inputLayerNames)
{
auto poSrcLayer = poSrcDS->GetLayerByName(srcLayerName.c_str());
if (!poSrcLayer)
{
ReportError(CE_Failure, CPLE_AppDefined,
"Cannot find source layer '%s'",
srcLayerName.c_str());
return false;
}
poOutDS->AddLayer(*poSrcLayer);
}
m_outputDataset.Set(std::move(poOutDS));
}
return true;
}
//! @endcond
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