mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-24 00:47:57 -05:00
310 lines
9.0 KiB
Plaintext
310 lines
9.0 KiB
Plaintext
/************************************************************************
|
|
* This file has been generated automatically from *
|
|
* *
|
|
* src/core/qgsfeatureiterator.h *
|
|
* *
|
|
* Do not edit manually ! Edit header and run scripts/sipify.py again *
|
|
************************************************************************/
|
|
|
|
|
|
|
|
class QgsAbstractFeatureIterator
|
|
{
|
|
%Docstring(signature="appended")
|
|
Internal feature iterator to be implemented within data providers
|
|
%End
|
|
|
|
%TypeHeaderCode
|
|
#include "qgsfeatureiterator.h"
|
|
%End
|
|
public:
|
|
|
|
enum CompileStatus
|
|
{
|
|
NoCompilation,
|
|
PartiallyCompiled,
|
|
Compiled,
|
|
};
|
|
|
|
QgsAbstractFeatureIterator( const QgsFeatureRequest &request );
|
|
%Docstring
|
|
base class constructor - stores the iteration parameters
|
|
%End
|
|
|
|
virtual ~QgsAbstractFeatureIterator();
|
|
|
|
virtual bool nextFeature( QgsFeature &f );
|
|
%Docstring
|
|
Fetch next feature and stores in ``f``, returns ``True`` on success.
|
|
%End
|
|
|
|
virtual bool rewind() = 0;
|
|
%Docstring
|
|
Resets the iterator to the starting position.
|
|
%End
|
|
|
|
virtual bool close() = 0;
|
|
%Docstring
|
|
Call to end the iteration. This frees any resources used by the iterator.
|
|
%End
|
|
|
|
|
|
CompileStatus compileStatus() const;
|
|
%Docstring
|
|
Returns the status of expression compilation for filter expression requests.
|
|
%End
|
|
|
|
virtual bool isValid() const;
|
|
%Docstring
|
|
Returns if this iterator is valid.
|
|
An invalid feature iterator is not able to provide a reliable source for data.
|
|
If an iterator is invalid, either give up or try to send the request again (preferably
|
|
after a timeout to give the system some time to stay responsive).
|
|
|
|
If you want to check if the iterator successfully completed, better use :py:func:`QgsFeatureIterator.isClosed()`.
|
|
%End
|
|
|
|
bool compileFailed() const;
|
|
%Docstring
|
|
Indicator if there was an error when sending the compiled query to the server.
|
|
This indicates that there is something wrong with the expression compiler.
|
|
|
|
.. versionadded:: 3.2
|
|
%End
|
|
|
|
enum class RequestToSourceCrsResult
|
|
{
|
|
Success,
|
|
DistanceWithinMustBeCheckedManually,
|
|
};
|
|
|
|
protected:
|
|
|
|
virtual bool fetchFeature( QgsFeature &f ) = 0;
|
|
%Docstring
|
|
If you write a feature iterator for your provider, this is the method you
|
|
need to implement!!
|
|
|
|
:param f: The feature to write to
|
|
|
|
:return: ``True`` if a feature was written to f
|
|
%End
|
|
|
|
virtual bool nextFeatureFilterExpression( QgsFeature &f );
|
|
%Docstring
|
|
By default, the iterator will fetch all features and check if the feature
|
|
matches the expression.
|
|
If you have a more sophisticated metodology (SQL request for the features...)
|
|
and you check for the expression in your fetchFeature method, you can just
|
|
redirect this call to fetchFeature so the default check will be omitted.
|
|
|
|
:param f: The feature to write to
|
|
|
|
:return: ``True`` if a feature was written to f
|
|
%End
|
|
|
|
virtual bool nextFeatureFilterFids( QgsFeature &f );
|
|
%Docstring
|
|
By default, the iterator will fetch all features and check if the id
|
|
is in the request.
|
|
If you have a more sophisticated metodology (SQL request for the features...)
|
|
and you are sure, that any feature you return from fetchFeature will match
|
|
if the request was FilterFids you can just redirect this call to fetchFeature
|
|
so the default check will be omitted.
|
|
|
|
:param f: The feature to write to
|
|
|
|
:return: ``True`` if a feature was written to f
|
|
%End
|
|
|
|
void geometryToDestinationCrs( QgsFeature &feature, const QgsCoordinateTransform &transform ) const;
|
|
%Docstring
|
|
Transforms ``feature``'s geometry according to the specified coordinate ``transform``.
|
|
If ``feature`` has no geometry or ``transform`` is invalid then calling this method
|
|
has no effect and will be shortcut.
|
|
Iterators should call this method before returning features to ensure that any
|
|
:py:func:`QgsFeatureRequest.destinationCrs()` set on the request is respected.
|
|
%End
|
|
|
|
|
|
QgsRectangle filterRectToSourceCrs( const QgsCoordinateTransform &transform ) const throw( QgsCsException );
|
|
%Docstring
|
|
Returns a rectangle representing the original request's :py:func:`QgsFeatureRequest.filterRect()`.
|
|
If ``transform`` is a valid coordinate transform, the return rectangle will represent
|
|
the requested :py:func:`~QgsAbstractFeatureIterator.filterRect` transformed to the source's coordinate reference system.
|
|
Iterators should call this method and use the returned rectangle for filtering
|
|
features to ensure that any :py:func:`QgsFeatureRequest.destinationCrs()` set on the request is respected.
|
|
Will throw a :py:class:`QgsCsException` if the rect cannot be transformed from the destination CRS.
|
|
%End
|
|
|
|
RequestToSourceCrsResult updateRequestToSourceCrs( QgsFeatureRequest &request, const QgsCoordinateTransform &transform ) const throw( QgsCsException );
|
|
%Docstring
|
|
Update a :py:class:`QgsFeatureRequest` so that spatial filters are
|
|
transformed to the source's coordinate reference system.
|
|
Iterators should call this method against the request used for filtering
|
|
features to ensure that any :py:func:`QgsFeatureRequest.destinationCrs()` set on the request is respected.
|
|
|
|
:return: result of operation. See QgsAbstractFeatureIterator.RequestToSourceCrsResult for interpretation.
|
|
|
|
:raises QgsCsException: if the rect cannot be transformed from the destination CRS.
|
|
|
|
.. versionadded:: 3.22
|
|
%End
|
|
|
|
|
|
|
|
|
|
|
|
void ref();
|
|
%Docstring
|
|
Add reference
|
|
%End
|
|
void deref();
|
|
%Docstring
|
|
Remove reference, delete if refs == 0
|
|
%End
|
|
|
|
|
|
|
|
|
|
virtual bool prepareSimplification( const QgsSimplifyMethod &simplifyMethod );
|
|
%Docstring
|
|
Setup the simplification of geometries to fetch using the specified simplify method
|
|
%End
|
|
|
|
|
|
};
|
|
|
|
|
|
template<T>
|
|
class QgsAbstractFeatureIteratorFromSource : QgsAbstractFeatureIterator
|
|
{
|
|
%Docstring(signature="appended")
|
|
Helper template that cares of two things: 1. automatic deletion of source if owned by iterator, 2. notification of open/closed iterator.
|
|
|
|
.. note::
|
|
|
|
not available in Python bindings (although present in SIP file)
|
|
%End
|
|
|
|
%TypeHeaderCode
|
|
#include "qgsfeatureiterator.h"
|
|
%End
|
|
public:
|
|
QgsAbstractFeatureIteratorFromSource( T *source, bool ownSource, const QgsFeatureRequest &request );
|
|
|
|
~QgsAbstractFeatureIteratorFromSource();
|
|
|
|
protected:
|
|
void iteratorClosed();
|
|
%Docstring
|
|
to be called by from subclass in :py:func:`~QgsAbstractFeatureIteratorFromSource.close`
|
|
%End
|
|
|
|
};
|
|
|
|
|
|
class QgsFeatureIterator
|
|
{
|
|
%Docstring(signature="appended")
|
|
Wrapper for iterator of features from vector data provider or vector layer
|
|
%End
|
|
|
|
%TypeHeaderCode
|
|
#include "qgsfeatureiterator.h"
|
|
%End
|
|
public:
|
|
|
|
QgsFeatureIterator *__iter__();
|
|
%MethodCode
|
|
sipRes = sipCpp;
|
|
%End
|
|
|
|
SIP_PYOBJECT __next__() /TypeHint="QgsFeature"/;
|
|
%MethodCode
|
|
std::unique_ptr< QgsFeature > f = std::make_unique< QgsFeature >();
|
|
bool result = false;
|
|
Py_BEGIN_ALLOW_THREADS
|
|
result = ( sipCpp->nextFeature( *f ) );
|
|
Py_END_ALLOW_THREADS
|
|
if ( result )
|
|
sipRes = sipConvertFromType( f.release(), sipType_QgsFeature, Py_None );
|
|
else
|
|
{
|
|
PyErr_SetString( PyExc_StopIteration, "" );
|
|
}
|
|
%End
|
|
|
|
QgsFeatureIterator();
|
|
%Docstring
|
|
Construct invalid iterator
|
|
%End
|
|
QgsFeatureIterator( QgsAbstractFeatureIterator *iter /Transfer/ );
|
|
%Docstring
|
|
Construct a valid iterator
|
|
%End
|
|
QgsFeatureIterator( const QgsFeatureIterator &fi );
|
|
%Docstring
|
|
Copy constructor copies the iterator, increases ref.count
|
|
%End
|
|
~QgsFeatureIterator();
|
|
|
|
|
|
bool nextFeature( QgsFeature &f );
|
|
%Docstring
|
|
Fetch next feature and stores in ``f``, returns ``True`` on success.
|
|
%End
|
|
|
|
bool rewind();
|
|
%Docstring
|
|
Resets the iterator to the starting position.
|
|
%End
|
|
|
|
bool close();
|
|
%Docstring
|
|
Call to end the iteration. This frees any resources used by the iterator.
|
|
%End
|
|
|
|
bool isValid() const;
|
|
%Docstring
|
|
Will return if this iterator is valid.
|
|
An invalid iterator was probably introduced by a failed attempt to acquire a connection
|
|
or is a default constructed iterator.
|
|
|
|
.. seealso:: :py:func:`isClosed` to check if the iterator successfully completed and returned all the features.
|
|
%End
|
|
|
|
bool isClosed() const;
|
|
%Docstring
|
|
find out whether the iterator is still valid or closed already
|
|
%End
|
|
|
|
|
|
QgsAbstractFeatureIterator::CompileStatus compileStatus() const;
|
|
%Docstring
|
|
Returns the status of expression compilation for filter expression requests.
|
|
%End
|
|
|
|
bool compileFailed() const;
|
|
%Docstring
|
|
Indicator if there was an error when sending the compiled query to the server.
|
|
This indicates that there is something wrong with the expression compiler.
|
|
|
|
.. versionadded:: 3.2
|
|
%End
|
|
|
|
|
|
protected:
|
|
|
|
|
|
};
|
|
|
|
|
|
/************************************************************************
|
|
* This file has been generated automatically from *
|
|
* *
|
|
* src/core/qgsfeatureiterator.h *
|
|
* *
|
|
* Do not edit manually ! Edit header and run scripts/sipify.py again *
|
|
************************************************************************/
|