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gdalpythondriverloader.cpp
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/******************************************************************************
*
* Project: GDAL Core
* Purpose: Python plugin loader
* Author: Even Rouault, <even dot rouault at spatialys dot com>
*
******************************************************************************
* Copyright (c) 2017-2019, Even Rouault, <even dot rouault at spatialys dot
*com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "cpl_conv.h"
#include "cpl_string.h"
#include "gdal_priv.h"
#include "ogrsf_frmts.h"
#include "gdalpython.h"
#include <algorithm>
#include <memory>
#include <mutex>
using namespace GDALPy;
#ifdef GDAL_NO_AUTOLOAD
void GDALDriverManager::AutoLoadPythonDrivers()
{
}
void GDALDriverManager::CleanupPythonDrivers()
{
}
#else
static PyObject *layer_featureCount(PyObject *m, PyObject *args,
PyObject *kwargs);
static const PyMethodDef gdal_python_driver_methods[] = {
{"layer_featureCount", layer_featureCount, METH_VARARGS | METH_KEYWORDS,
nullptr},
{nullptr, nullptr, 0, nullptr}};
static PyObject *Py_None = nullptr;
static PyObject *gpoGDALPythonDriverModule = nullptr;
/************************************************************************/
/* IncRefAndReturn() */
/************************************************************************/
static PyObject *IncRefAndReturn(PyObject *obj)
{
Py_IncRef(obj);
return obj;
}
/************************************************************************/
/* CallPython() */
/************************************************************************/
static PyObject *CallPython(PyObject *function)
{
PyObject *pyArgs = PyTuple_New(0);
PyObject *pRet = PyObject_Call(function, pyArgs, nullptr);
Py_DecRef(pyArgs);
return pRet;
}
/************************************************************************/
/* CallPython() */
/************************************************************************/
static PyObject *CallPython(PyObject *function, int nVal)
{
PyObject *pyArgs = PyTuple_New(1);
PyTuple_SetItem(pyArgs, 0, PyLong_FromLong(nVal));
PyObject *pRet = PyObject_Call(function, pyArgs, nullptr);
Py_DecRef(pyArgs);
return pRet;
}
/************************************************************************/
/* InitializePythonAndLoadGDALPythonDriverModule() */
/************************************************************************/
static bool InitializePythonAndLoadGDALPythonDriverModule()
{
if (!GDALPythonInitialize())
return false;
static std::mutex gMutex;
static bool gbAlreadyInitialized = false;
std::lock_guard<std::mutex> guard(gMutex);
if (gbAlreadyInitialized)
return true;
gbAlreadyInitialized = true;
GIL_Holder oHolder(false);
static PyModuleDef gdal_python_driver_moduledef = {
PyModuleDef_HEAD_INIT,
"_gdal_python_driver",
nullptr,
static_cast<Py_ssize_t>(-1), // sizeof(struct module_state),
gdal_python_driver_methods,
nullptr,
nullptr,
nullptr,
nullptr};
PyObject *module =
PyModule_Create2(&gdal_python_driver_moduledef, PYTHON_API_VERSION);
// Add module to importable modules
PyObject *sys = PyImport_ImportModule("sys");
PyObject *sys_modules = PyObject_GetAttrString(sys, "modules");
PyDict_SetItemString(sys_modules, "_gdal_python_driver", module);
Py_DecRef(sys_modules);
Py_DecRef(sys);
Py_DecRef(module);
PyObject *poCompiledString = Py_CompileString(
"import _gdal_python_driver\n"
"import json\n"
"import inspect\n"
"import sys\n"
"class BaseLayer:\n"
" RandomRead='RandomRead'\n"
" FastSpatialFilter='FastSpatialFilter'\n"
" FastFeatureCount='FastFeatureCount'\n"
" FastGetExtent='FastGetExtent'\n"
" StringsAsUTF8='StringsAsUTF8'\n"
"\n"
" def __init__(self):\n"
" pass\n"
"\n"
" def feature_count(self, force):\n"
" assert isinstance(self, BaseLayer), 'self not instance of "
"BaseLayer'\n"
" return _gdal_python_driver.layer_featureCount(self, force)\n"
"\n"
"class BaseDataset:\n"
" def __init__(self):\n"
" pass\n"
"\n"
"class BaseDriver:\n"
" def __init__(self):\n"
" pass\n"
"\n"
"def _gdal_returnNone():\n"
" return None"
"\n"
"def _gdal_json_serialize(d):\n"
" return json.dumps(d)\n"
"\n"
"def _instantiate_plugin(plugin_module):\n"
" candidate = None\n"
" for key in dir(plugin_module):\n"
" elt = getattr(plugin_module, key)\n"
" if inspect.isclass(elt) and sys.modules[elt.__module__] == "
"plugin_module and issubclass(elt, BaseDriver):\n"
" if candidate:\n"
" raise Exception(\"several classes in \" + "
"plugin_module.__name__ + \" deriving from "
"gdal_python_driver.BaseDriver\")\n"
" candidate = elt\n"
" if candidate:\n"
" return candidate()\n"
" raise Exception(\"cannot find class in \" + plugin_module.__name__ "
"+ \" deriving from gdal_python_driver.BaseDriver\")\n",
"gdal_python_driver", Py_file_input);
gpoGDALPythonDriverModule =
PyImport_ExecCodeModule("gdal_python_driver", poCompiledString);
Py_DecRef(poCompiledString);
// Initialize Py_None
PyObject *returnNone =
PyObject_GetAttrString(gpoGDALPythonDriverModule, "_gdal_returnNone");
Py_None = CallPython(returnNone);
Py_DecRef(returnNone);
return true;
}
/************************************************************************/
/* GetIntRes() */
/************************************************************************/
static int GetIntRes(PyObject *poObj, const char *pszFunctionName)
{
PyObject *poMethod = PyObject_GetAttrString(poObj, pszFunctionName);
if (poMethod == nullptr || PyErr_Occurred())
{
CPLError(CE_Failure, CPLE_AppDefined, "%s",
GetPyExceptionString().c_str());
return 0;
}
PyObject *poMethodRes = CallPython(poMethod);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poMethod);
return 0;
}
Py_DecRef(poMethod);
int nRes = static_cast<int>(PyLong_AsLong(poMethodRes));
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poMethodRes);
return 0;
}
Py_DecRef(poMethodRes);
return nRes;
}
/************************************************************************/
/* GetDict() */
/************************************************************************/
static char **GetDict(PyObject *poDict)
{
PyObject *key, *value;
size_t pos = 0;
char **papszRes = nullptr;
while (PyDict_Next(poDict, &pos, &key, &value))
{
if (ErrOccurredEmitCPLError())
{
break;
}
CPLString osKey = GetString(key);
if (ErrOccurredEmitCPLError())
{
break;
}
CPLString osValue = GetString(value);
if (ErrOccurredEmitCPLError())
{
break;
}
papszRes = CSLSetNameValue(papszRes, osKey, osValue);
}
return papszRes;
}
/************************************************************************/
/* GetStringRes() */
/************************************************************************/
static CPLString GetStringRes(PyObject *poObj, const char *pszFunctionName,
bool bOptionalMethod = false)
{
PyObject *poMethod = PyObject_GetAttrString(poObj, pszFunctionName);
if (poMethod == nullptr || PyErr_Occurred())
{
if (bOptionalMethod)
{
PyErr_Clear();
}
else
{
CPLError(CE_Failure, CPLE_AppDefined, "%s",
GetPyExceptionString().c_str());
}
return CPLString();
}
PyObject *poMethodRes = CallPython(poMethod);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poMethod);
return CPLString();
}
Py_DecRef(poMethod);
CPLString osRes = GetString(poMethodRes);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poMethodRes);
return CPLString();
}
Py_DecRef(poMethodRes);
return osRes;
}
/************************************************************************/
/* PythonPluginLayer */
/************************************************************************/
class PythonPluginLayer final : public OGRLayer
{
PyObject *m_poLayer = nullptr;
OGRFeatureDefn *m_poFeatureDefn = nullptr;
CPLString m_osName{};
CPLString m_osFIDColumn{};
bool m_bHasFIDColumn = false;
std::map<CPLString, CPLStringList> m_oMapMD{};
PyObject *m_pyFeatureByIdMethod = nullptr;
bool m_bIteratorHonourSpatialFilter = false;
bool m_bIteratorHonourAttributeFilter = false;
bool m_bFeatureCountHonourSpatialFilter = false;
bool m_bFeatureCountHonourAttributeFilter = false;
PyObject *m_pyIterator = nullptr;
bool m_bStopIteration = false;
void RefreshHonourFlags();
void StoreSpatialFilter();
void GetFields();
void GetGeomFields();
OGRFeature *TranslateToOGRFeature(PyObject *poObj);
PythonPluginLayer(const PythonPluginLayer &) = delete;
PythonPluginLayer &operator=(const PythonPluginLayer &) = delete;
public:
explicit PythonPluginLayer(PyObject *poLayer);
~PythonPluginLayer();
const char *GetName() override;
void ResetReading() override;
OGRFeature *GetNextFeature() override;
OGRFeature *GetFeature(GIntBig nFID) override;
int TestCapability(const char *) override;
OGRFeatureDefn *GetLayerDefn() override;
GIntBig GetFeatureCount(int bForce) override;
const char *GetFIDColumn() override;
OGRErr SetAttributeFilter(const char *) override;
void SetSpatialFilter(OGRGeometry *) override;
void SetSpatialFilter(int iGeomField, OGRGeometry *) override;
OGRErr GetExtent(OGREnvelope *psExtent, int bForce) override;
OGRErr GetExtent(int iGeomField, OGREnvelope *psExtent, int bForce) override
{
return OGRLayer::GetExtent(iGeomField, psExtent, bForce);
}
char **GetMetadata(const char *pszDomain = "") override;
};
/************************************************************************/
/* PythonPluginLayer() */
/************************************************************************/
PythonPluginLayer::PythonPluginLayer(PyObject *poLayer)
: m_poLayer(poLayer), m_poFeatureDefn(nullptr)
{
SetDescription(PythonPluginLayer::GetName());
const char *pszPtr = CPLSPrintf("%p", this);
PyObject *ptr = PyUnicode_FromString(pszPtr);
PyObject_SetAttrString(m_poLayer, "_gdal_pointer", ptr);
Py_DecRef(ptr);
PyObject_SetAttrString(m_poLayer, "spatial_filter_extent", Py_None);
PyObject_SetAttrString(m_poLayer, "spatial_filter", Py_None);
PyObject_SetAttrString(m_poLayer, "attribute_filter", Py_None);
auto poFalse = PyBool_FromLong(false);
if (!PyObject_HasAttrString(m_poLayer, "iterator_honour_attribute_filter"))
{
PyObject_SetAttrString(m_poLayer, "iterator_honour_attribute_filter",
poFalse);
}
if (!PyObject_HasAttrString(m_poLayer, "iterator_honour_spatial_filter"))
{
PyObject_SetAttrString(m_poLayer, "iterator_honour_spatial_filter",
poFalse);
}
if (!PyObject_HasAttrString(m_poLayer,
"feature_count_honour_attribute_filter"))
{
PyObject_SetAttrString(
m_poLayer, "feature_count_honour_attribute_filter", poFalse);
}
if (!PyObject_HasAttrString(m_poLayer,
"feature_count_honour_spatial_filter"))
{
PyObject_SetAttrString(m_poLayer, "feature_count_honour_spatial_filter",
poFalse);
}
Py_DecRef(poFalse);
RefreshHonourFlags();
if (PyObject_HasAttrString(m_poLayer, "feature_by_id"))
{
m_pyFeatureByIdMethod =
PyObject_GetAttrString(m_poLayer, "feature_by_id");
}
}
/************************************************************************/
/* ~PythonPluginLayer() */
/************************************************************************/
PythonPluginLayer::~PythonPluginLayer()
{
GIL_Holder oHolder(false);
if (m_poFeatureDefn)
m_poFeatureDefn->Release();
Py_DecRef(m_pyFeatureByIdMethod);
Py_DecRef(m_poLayer);
Py_DecRef(m_pyIterator);
}
/************************************************************************/
/* RefreshHonourFlags() */
/************************************************************************/
void PythonPluginLayer::RefreshHonourFlags()
{
if (PyObject_HasAttrString(m_poLayer, "iterator_honour_attribute_filter"))
{
auto poObj = PyObject_GetAttrString(m_poLayer,
"iterator_honour_attribute_filter");
m_bIteratorHonourAttributeFilter = PyLong_AsLong(poObj) != 0;
Py_DecRef(poObj);
}
if (PyObject_HasAttrString(m_poLayer, "iterator_honour_spatial_filter"))
{
auto poObj =
PyObject_GetAttrString(m_poLayer, "iterator_honour_spatial_filter");
m_bIteratorHonourSpatialFilter = PyLong_AsLong(poObj) != 0;
Py_DecRef(poObj);
}
if (PyObject_HasAttrString(m_poLayer,
"feature_count_honour_attribute_filter"))
{
auto poObj = PyObject_GetAttrString(
m_poLayer, "feature_count_honour_attribute_filter");
m_bFeatureCountHonourAttributeFilter = PyLong_AsLong(poObj) != 0;
Py_DecRef(poObj);
}
if (PyObject_HasAttrString(m_poLayer,
"feature_count_honour_spatial_filter"))
{
auto poObj = PyObject_GetAttrString(
m_poLayer, "feature_count_honour_spatial_filter");
m_bFeatureCountHonourSpatialFilter = PyLong_AsLong(poObj) != 0;
Py_DecRef(poObj);
}
}
/************************************************************************/
/* SetAttributeFilter() */
/************************************************************************/
OGRErr PythonPluginLayer::SetAttributeFilter(const char *pszFilter)
{
GIL_Holder oHolder(false);
PyObject *str =
pszFilter ? PyUnicode_FromString(pszFilter) : IncRefAndReturn(Py_None);
PyObject_SetAttrString(m_poLayer, "attribute_filter", str);
Py_DecRef(str);
if (PyObject_HasAttrString(m_poLayer, "attribute_filter_changed"))
{
auto poObj =
PyObject_GetAttrString(m_poLayer, "attribute_filter_changed");
Py_DecRef(CallPython(poObj));
Py_DecRef(poObj);
}
return OGRLayer::SetAttributeFilter(pszFilter);
}
/************************************************************************/
/* StoreSpatialFilter() */
/************************************************************************/
void PythonPluginLayer::StoreSpatialFilter()
{
GIL_Holder oHolder(false);
if (m_poFilterGeom && !m_poFilterGeom->IsEmpty())
{
PyObject *list = PyList_New(4);
PyList_SetItem(list, 0, PyFloat_FromDouble(m_sFilterEnvelope.MinX));
PyList_SetItem(list, 1, PyFloat_FromDouble(m_sFilterEnvelope.MinY));
PyList_SetItem(list, 2, PyFloat_FromDouble(m_sFilterEnvelope.MaxX));
PyList_SetItem(list, 3, PyFloat_FromDouble(m_sFilterEnvelope.MaxY));
PyObject_SetAttrString(m_poLayer, "spatial_filter_extent", list);
Py_DecRef(list);
char *pszWKT = nullptr;
m_poFilterGeom->exportToWkt(&pszWKT);
PyObject *str = PyUnicode_FromString(pszWKT);
PyObject_SetAttrString(m_poLayer, "spatial_filter", str);
Py_DecRef(str);
CPLFree(pszWKT);
}
else
{
PyObject_SetAttrString(m_poLayer, "spatial_filter_extent", Py_None);
PyObject_SetAttrString(m_poLayer, "spatial_filter", Py_None);
}
if (PyObject_HasAttrString(m_poLayer, "spatial_filter_changed"))
{
auto poObj =
PyObject_GetAttrString(m_poLayer, "spatial_filter_changed");
Py_DecRef(CallPython(poObj));
Py_DecRef(poObj);
}
}
/************************************************************************/
/* SetSpatialFilter() */
/************************************************************************/
void PythonPluginLayer::SetSpatialFilter(OGRGeometry *poGeom)
{
OGRLayer::SetSpatialFilter(poGeom);
StoreSpatialFilter();
}
void PythonPluginLayer::SetSpatialFilter(int iGeomField, OGRGeometry *poGeom)
{
OGRLayer::SetSpatialFilter(iGeomField, poGeom);
StoreSpatialFilter();
}
/************************************************************************/
/* GetName() */
/************************************************************************/
const char *PythonPluginLayer::GetName()
{
if (m_osName.empty())
{
GIL_Holder oHolder(false);
PyObject *poObj = PyObject_GetAttrString(m_poLayer, "name");
if (ErrOccurredEmitCPLError())
return m_osName;
if (PyCallable_Check(poObj))
{
m_osName = GetStringRes(m_poLayer, "name");
}
else
{
m_osName = GetString(poObj);
CPL_IGNORE_RET_VAL(ErrOccurredEmitCPLError());
}
Py_DecRef(poObj);
}
return m_osName;
}
/************************************************************************/
/* TestCapability() */
/************************************************************************/
int PythonPluginLayer::TestCapability(const char *pszCap)
{
GIL_Holder oHolder(false);
if (PyObject_HasAttrString(m_poLayer, "test_capability"))
{
PyObject *poObj = PyObject_GetAttrString(m_poLayer, "test_capability");
if (ErrOccurredEmitCPLError())
return 0;
PyObject *pyArgs = PyTuple_New(1);
PyTuple_SetItem(pyArgs, 0, PyUnicode_FromString(pszCap));
PyObject *pRet = PyObject_Call(poObj, pyArgs, nullptr);
Py_DecRef(pyArgs);
Py_DecRef(poObj);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(pRet);
return 0;
}
int nRes = static_cast<int>(PyLong_AsLong(pRet));
Py_DecRef(pRet);
if (ErrOccurredEmitCPLError())
{
return 0;
}
return nRes;
}
return 0;
}
/************************************************************************/
/* GetFIDColumn() */
/************************************************************************/
const char *PythonPluginLayer::GetFIDColumn()
{
if (!m_bHasFIDColumn)
{
m_bHasFIDColumn = true;
GIL_Holder oHolder(false);
PyObject *poObj = PyObject_GetAttrString(m_poLayer, "fid_name");
if (PyErr_Occurred())
{
PyErr_Clear();
}
else
{
if (PyCallable_Check(poObj))
{
m_osFIDColumn = GetStringRes(m_poLayer, "fid_name", true);
}
else
{
m_osFIDColumn = GetString(poObj);
CPL_IGNORE_RET_VAL(ErrOccurredEmitCPLError());
}
Py_DecRef(poObj);
}
}
return m_osFIDColumn;
}
/************************************************************************/
/* layer_featureCount() */
/************************************************************************/
static PyObject *layer_featureCount(PyObject * /*m*/, PyObject *args,
PyObject * /*kwargs*/)
{
PyObject *poPyLayer = nullptr;
int bForce = 0;
if (PyArg_ParseTuple(args, "O|i", &poPyLayer, &bForce))
{
PyObject *poPointer =
PyObject_GetAttrString(poPyLayer, "_gdal_pointer");
if (poPointer)
{
CPLString osPtr = GetString(poPointer);
Py_DecRef(poPointer);
void *pPtr = nullptr;
sscanf(osPtr, "%p", &pPtr);
PythonPluginLayer *poLayer = static_cast<PythonPluginLayer *>(pPtr);
return PyLong_FromLongLong(
poLayer->OGRLayer::GetFeatureCount(bForce));
}
}
Py_IncRef(Py_None);
return Py_None;
}
/************************************************************************/
/* GetFeatureCount() */
/************************************************************************/
GIntBig PythonPluginLayer::GetFeatureCount(int bForce)
{
GIL_Holder oHolder(false);
if (PyObject_HasAttrString(m_poLayer, "feature_count") &&
(m_bFeatureCountHonourAttributeFilter || m_poAttrQuery == nullptr) &&
(m_bFeatureCountHonourSpatialFilter || m_poFilterGeom == nullptr))
{
auto poMethod = PyObject_GetAttrString(m_poLayer, "feature_count");
PyObject *poRet = CallPython(poMethod, bForce);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poRet);
return OGRLayer::GetFeatureCount(bForce);
}
GIntBig nRet = PyLong_AsLongLong(poRet);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poRet);
return OGRLayer::GetFeatureCount(bForce);
}
Py_DecRef(poRet);
return nRet;
}
return OGRLayer::GetFeatureCount(bForce);
}
/************************************************************************/
/* GetExtent() */
/************************************************************************/
OGRErr PythonPluginLayer::GetExtent(OGREnvelope *psExtent, int bForce)
{
GIL_Holder oHolder(false);
if (PyObject_HasAttrString(m_poLayer, "extent"))
{
PyObject *poMethod = PyObject_GetAttrString(m_poLayer, "extent");
if (poMethod != nullptr)
{
PyObject *poRet = CallPython(poMethod, bForce);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poRet);
return OGRLayer::GetExtent(psExtent, bForce);
}
if (poRet == Py_None)
{
Py_DecRef(poRet);
return OGRERR_FAILURE;
}
if (PySequence_Size(poRet) == 4)
{
PyObject *poMinX = PySequence_GetItem(poRet, 0);
PyObject *poMinY = PySequence_GetItem(poRet, 1);
PyObject *poMaxX = PySequence_GetItem(poRet, 2);
PyObject *poMaxY = PySequence_GetItem(poRet, 3);
double dfMinX = PyFloat_AsDouble(poMinX);
double dfMinY = PyFloat_AsDouble(poMinY);
double dfMaxX = PyFloat_AsDouble(poMaxX);
double dfMaxY = PyFloat_AsDouble(poMaxY);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(poRet);
return OGRLayer::GetExtent(psExtent, bForce);
}
Py_DecRef(poRet);
psExtent->MinX = dfMinX;
psExtent->MinY = dfMinY;
psExtent->MaxX = dfMaxX;
psExtent->MaxY = dfMaxY;
return OGRERR_NONE;
}
else
{
CPLError(CE_Failure, CPLE_AppDefined,
"List should have 4 values");
}
Py_DecRef(poRet);
}
}
return OGRLayer::GetExtent(psExtent, bForce);
}
/************************************************************************/
/* TranslateToOGRFeature() */
/************************************************************************/
OGRFeature *PythonPluginLayer::TranslateToOGRFeature(PyObject *poObj)
{
if (poObj == Py_None)
return nullptr;
OGRFeature *poFeature = new OGRFeature(GetLayerDefn());
PyObject *myBool = PyBool_FromLong(1);
PyObject *myBoolType = PyObject_Type(myBool);
PyObject *myInt = PyLong_FromLong(1);
PyObject *myIntType = PyObject_Type(myInt);
PyObject *myLong = PyLong_FromLongLong(1);
PyObject *myLongType = PyObject_Type(myLong);
PyObject *myFloat = PyFloat_FromDouble(1.0);
PyObject *myFloatType = PyObject_Type(myFloat);
PyObject *myStr = PyUnicode_FromString("");
PyObject *myStrType = PyObject_Type(myStr);
auto poFields = PyDict_GetItemString(poObj, "fields");
auto poGeometryFields = PyDict_GetItemString(poObj, "geometry_fields");
auto poId = PyDict_GetItemString(poObj, "id");
auto poStyleString = PyDict_GetItemString(poObj, "style");
PyErr_Clear();
if (poId && PyObject_IsInstance(poId, myLongType))
{
poFeature->SetFID(static_cast<GIntBig>(PyLong_AsLongLong(poId)));
}
else if (poId && PyObject_IsInstance(poId, myIntType))
{
poFeature->SetFID(static_cast<GIntBig>(PyLong_AsLong(poId)));
}
if (poStyleString && poStyleString != Py_None)
{
CPLString osValue = GetString(poStyleString);
if (!ErrOccurredEmitCPLError())
{
poFeature->SetStyleString(osValue);
}
}
if (poGeometryFields && poGeometryFields != Py_None)
{
PyObject *key = nullptr;
PyObject *value = nullptr;
size_t pos = 0;
while (PyDict_Next(poGeometryFields, &pos, &key, &value))
{
CPLString osKey = GetString(key);
if (ErrOccurredEmitCPLError())
{
break;
}
if (value != Py_None)
{
const int idx = m_poFeatureDefn->GetGeomFieldIndex(osKey);
if (idx >= 0)
{
OGRGeometry *poGeom = nullptr;
if (PyObject_IsInstance(value, myStrType))
{
// WKT
CPLString osValue = GetString(value);
if (ErrOccurredEmitCPLError())
{
break;
}
OGRGeometryFactory::createFromWkt(osValue.c_str(),
nullptr, &poGeom);
}
else
{
// WKB (from bytes, bytearray, memoryview)
PyObject *poBytes = PyBytes_FromObject(value);
if (ErrOccurredEmitCPLError())
{
break;
}
char *buffer = nullptr;
size_t length = 0;
PyBytes_AsStringAndSize(poBytes, &buffer, &length);
if (ErrOccurredEmitCPLError())
{
break;
}
OGRGeometryFactory::createFromWkb(
buffer, nullptr, &poGeom, length, wkbVariantIso);
}
if (poGeom)
{
const auto poGeomFieldDefn =
m_poFeatureDefn->GetGeomFieldDefn(idx);
if (poGeomFieldDefn)
poGeom->assignSpatialReference(
poGeomFieldDefn->GetSpatialRef());
}
poFeature->SetGeomFieldDirectly(idx, poGeom);
}
}
}
}
PyObject *key = nullptr;
PyObject *value = nullptr;
size_t pos = 0;
while (poFields && poFields != Py_None &&
PyDict_Next(poFields, &pos, &key, &value))
{
CPLString osKey = GetString(key);
if (ErrOccurredEmitCPLError())
{
break;
}
if (value == Py_None)
{
int idx = m_poFeatureDefn->GetFieldIndex(osKey);
if (idx >= 0)
{
poFeature->SetFieldNull(idx);
}
}
else if (PyObject_IsInstance(value, myLongType))
{
int idx = m_poFeatureDefn->GetFieldIndex(osKey);
if (idx >= 0)
{
poFeature->SetField(
idx, static_cast<GIntBig>(PyLong_AsLongLong(value)));
}
}
else if (PyObject_IsInstance(value, myBoolType) ||
PyObject_IsInstance(value, myIntType))
{
int idx = m_poFeatureDefn->GetFieldIndex(osKey);
if (idx >= 0)
{
poFeature->SetField(idx,
static_cast<GIntBig>(PyLong_AsLong(value)));
}
}
else if (PyObject_IsInstance(value, myFloatType))
{
int idx = m_poFeatureDefn->GetFieldIndex(osKey);
if (idx >= 0)
{
poFeature->SetField(idx, PyFloat_AsDouble(value));
}
}
else
{
int idx = m_poFeatureDefn->GetFieldIndex(osKey);
if (idx >= 0 &&
m_poFeatureDefn->GetFieldDefn(idx)->GetType() == OFTBinary)
{
Py_ssize_t nSize = PyBytes_Size(value);
const char *pszBytes = PyBytes_AsString(value);
poFeature->SetField(
idx, static_cast<int>(nSize),
const_cast<GByte *>(
reinterpret_cast<const GByte *>(pszBytes)));
continue;
}
CPLString osValue = GetString(value);
if (ErrOccurredEmitCPLError())
{
break;
}
if (idx >= 0)
{
poFeature->SetField(idx, osValue);
}
}
}
Py_DecRef(myBoolType);
Py_DecRef(myBool);
Py_DecRef(myIntType);
Py_DecRef(myInt);
Py_DecRef(myLongType);
Py_DecRef(myLong);
Py_DecRef(myFloatType);
Py_DecRef(myFloat);
Py_DecRef(myStr);
Py_DecRef(myStrType);
return poFeature;
}
/************************************************************************/
/* GetFeature() */
/************************************************************************/
OGRFeature *PythonPluginLayer::GetFeature(GIntBig nFID)
{
GIL_Holder oHolder(false);
if (m_pyFeatureByIdMethod)
{
PyObject *pyArgs = PyTuple_New(1);
PyTuple_SetItem(pyArgs, 0, PyLong_FromLongLong(nFID));
PyObject *pRet = PyObject_Call(m_pyFeatureByIdMethod, pyArgs, nullptr);
Py_DecRef(pyArgs);
if (ErrOccurredEmitCPLError())
{
Py_DecRef(pRet);
return nullptr;
}
auto poFeature = TranslateToOGRFeature(pRet);
Py_DecRef(pRet);
if (ErrOccurredEmitCPLError())
{
return nullptr;
}
return poFeature;
}
return OGRLayer::GetFeature(nFID);
}
/************************************************************************/
/* ResetReading() */
/************************************************************************/
void PythonPluginLayer::ResetReading()
{
m_bStopIteration = false;
GIL_Holder oHolder(false);
Py_DecRef(m_pyIterator);
m_pyIterator = PyObject_GetIter(m_poLayer);
CPL_IGNORE_RET_VAL(ErrOccurredEmitCPLError());
}
/************************************************************************/
/* GetNextFeature() */
/************************************************************************/
OGRFeature *PythonPluginLayer::GetNextFeature()
{
GIL_Holder oHolder(false);
if (m_bStopIteration)
return nullptr;
if (m_pyIterator == nullptr)
{
ResetReading();
if (m_pyIterator == nullptr)
{
return nullptr;