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qgsfeaturerequest.sip.in
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/************************************************************************
* This file has been generated automatically from *
* *
* src/core/qgsfeaturerequest.h *
* *
* Do not edit manually ! Edit header and run scripts/sipify.pl again *
************************************************************************/
class QgsFeatureRequest
{
%Docstring
This class wraps a request for features to a vector layer (or directly its vector data provider).
The request may apply a filter to fetch only a particular subset of features. Currently supported filters:
- no filter - all features are returned
- feature id - only feature that matches given feature id is returned
- feature ids - only features that match any of the given feature ids are returned
- filter expression - only features that match the given filter expression are returned
Additionally a spatial rectangle can be set in combination:
Only features that intersect given rectangle should be fetched. For the sake of speed,
the intersection is often done only using feature's bounding box. There is a flag
ExactIntersect that makes sure that only intersecting features will be returned.
For efficiency, it is also possible to tell provider that some data is not required:
- NoGeometry flag
- SubsetOfAttributes flag
- SimplifyMethod for geometries to fetch
The options may be chained, e.g.:
.. code-block:: python
QgsFeatureRequest().setFilterRect(QgsRectangle(0,0,1,1)).setFlags(QgsFeatureRequest.ExactIntersect)
Examples:
.. code-block:: python
# fetch all features:
QgsFeatureRequest()
# fetch all features, only one attribute
QgsFeatureRequest().setSubsetOfAttributes(['myfield'], layer.fields())
# fetch all features, without geometries
QgsFeatureRequest().setFlags(QgsFeatureRequest.NoGeometry)
# fetch only features from particular extent
QgsFeatureRequest().setFilterRect(QgsRectangle(0,0,1,1))
# fetch only one feature
QgsFeatureRequest().setFilterFid(45)
%End
%TypeHeaderCode
#include "qgsfeaturerequest.h"
%End
public:
enum Flag
{
NoFlags,
NoGeometry,
SubsetOfAttributes,
ExactIntersect,
IgnoreStaticNodesDuringExpressionCompilation,
};
typedef QFlags<QgsFeatureRequest::Flag> Flags;
enum FilterType
{
FilterNone,
FilterFid,
FilterExpression,
FilterFids
};
enum InvalidGeometryCheck
{
GeometryNoCheck,
GeometrySkipInvalid,
GeometryAbortOnInvalid,
};
class OrderByClause
{
%Docstring
The OrderByClause class represents an order by clause for a QgsFeatureRequest.
It can be a simple field or an expression. Multiple order by clauses can be added to
a QgsFeatureRequest to fine tune the behavior if a single field or expression is not
enough to completely specify the required behavior.
If expression compilation is activated in the settings and the expression can be
translated for the provider in question, it will be evaluated on provider side.
If one of these two premises does not apply, the ordering will take place locally
which results in increased memory and CPU usage.
If the ordering is done on strings, the order depends on the system's locale if the
local fallback implementation is used. The order depends on the server system's locale
and implementation if ordering is done on the server.
In case the fallback code needs to be used, a limit set on the request will be respected
for the features returned by the iterator but internally all features will be requested
from the provider.
.. versionadded:: 2.14
%End
%TypeHeaderCode
#include "qgsfeaturerequest.h"
%End
public:
OrderByClause( const QString &expression, bool ascending = true );
%Docstring
Creates a new OrderByClause for a :py:class:`QgsFeatureRequest`
:param expression: The expression to use for ordering
:param ascending: If the order should be ascending (1,2,3) or descending (3,2,1)
If the order is ascending, by default nulls are last
If the order is descending, by default nulls are first
%End
OrderByClause( const QString &expression, bool ascending, bool nullsfirst );
%Docstring
Creates a new OrderByClause for a :py:class:`QgsFeatureRequest`
:param expression: The expression to use for ordering
:param ascending: If the order should be ascending (1,2,3) or descending (3,2,1)
:param nullsfirst: If ``True``, NULLS are at the beginning, if ``False``, NULLS are at the end
%End
OrderByClause( const QgsExpression &expression, bool ascending = true );
%Docstring
Creates a new OrderByClause for a :py:class:`QgsFeatureRequest`
:param expression: The expression to use for ordering
:param ascending: If the order should be ascending (1,2,3) or descending (3,2,1)
If the order is ascending, by default nulls are last
If the order is descending, by default nulls are first
%End
OrderByClause( const QgsExpression &expression, bool ascending, bool nullsfirst );
%Docstring
Creates a new OrderByClause for a :py:class:`QgsFeatureRequest`
:param expression: The expression to use for ordering
:param ascending: If the order should be ascending (1,2,3) or descending (3,2,1)
:param nullsfirst: If ``True``, NULLS are at the beginning, if ``False``, NULLS are at the end
%End
QgsExpression expression() const;
%Docstring
The expression
:return: the expression
%End
bool prepare( QgsExpressionContext *context );
%Docstring
Prepare the expression with the given context.
.. seealso:: :py:func:`QgsExpression.prepare`
.. versionadded:: 3.0
%End
bool ascending() const;
%Docstring
Order ascending
:return: If ascending order is requested
%End
void setAscending( bool ascending );
%Docstring
Set if ascending order is requested
%End
bool nullsFirst() const;
%Docstring
Set if NULLS should be returned first
:return: if NULLS should be returned first
%End
void setNullsFirst( bool nullsFirst );
%Docstring
Set if NULLS should be returned first
%End
QString dump() const;
%Docstring
Dumps the content to an SQL equivalent
%End
};
class OrderBy
{
%Docstring
Represents a list of OrderByClauses, with the most important first and the least
important last.
.. versionadded:: 2.14
%End
%TypeHeaderCode
#include "qgsfeaturerequest.h"
%End
public:
OrderBy();
%Docstring
Create a new empty order by
%End
OrderBy( const QList<QgsFeatureRequest::OrderByClause> &other );
%Docstring
Create a new order by from a list of clauses
%End
QList<QgsFeatureRequest::OrderByClause> list() const;
%Docstring
Gets a copy as a list of OrderByClauses
This is only required in Python where the inheritance
is not properly propagated and this makes it usable.
%End
void save( QDomElement &elem ) const;
%Docstring
Serialize to XML
%End
void load( const QDomElement &elem );
%Docstring
Deserialize from XML
%End
QSet<QString> usedAttributes() const;
%Docstring
Returns a set of used attributes
.. note::
The returned attributes names are NOT guaranteed to be valid.
%End
QSet<int> usedAttributeIndices( const QgsFields &fields ) const;
%Docstring
Returns a set of used, validated attribute indices
.. versionadded:: 3.8
%End
QString dump() const;
%Docstring
Dumps the content to an SQL equivalent syntax
%End
};
static const QString ALL_ATTRIBUTES;
QgsFeatureRequest();
%Docstring
construct a default request: for all features get attributes and geometries
%End
explicit QgsFeatureRequest( QgsFeatureId fid );
%Docstring
construct a request with feature ID filter
%End
explicit QgsFeatureRequest( const QgsFeatureIds &fids );
%Docstring
construct a request with feature ID filter
%End
explicit QgsFeatureRequest( const QgsRectangle &rectangle );
%Docstring
Construct a request with ``rectangle`` bounding box filter.
When a destination CRS is set using :py:func:`~QgsFeatureRequest.setDestinationCrs`, ``rectangle``
is expected to be in the same CRS as the :py:func:`~QgsFeatureRequest.destinationCrs`. Otherwise, ``rectangle``
should use the same CRS as the source layer/provider.
%End
explicit QgsFeatureRequest( const QgsExpression &expr, const QgsExpressionContext &context = QgsExpressionContext() );
%Docstring
construct a request with a filter expression
%End
QgsFeatureRequest( const QgsFeatureRequest &rh );
%Docstring
copy constructor
%End
FilterType filterType() const;
%Docstring
Returns the filter type which is currently set on this request
:return: Filter type
%End
QgsFeatureRequest &setFilterRect( const QgsRectangle &rectangle );
%Docstring
Sets the ``rectangle`` from which features will be taken. An empty rectangle removes the filter.
When a destination CRS is set using :py:func:`~QgsFeatureRequest.setDestinationCrs`, ``rectangle``
is expected to be in the same CRS as the :py:func:`~QgsFeatureRequest.destinationCrs`. Otherwise, ``rectangle``
should use the same CRS as the source layer/provider.
.. seealso:: :py:func:`filterRect`
%End
const QgsRectangle &filterRect() const;
%Docstring
Returns the rectangle from which features will be taken. If the returned
rectangle is null, then no filter rectangle is set.
When a destination CRS is set using :py:func:`~QgsFeatureRequest.setDestinationCrs`, the rectangle
will be in the same CRS as the :py:func:`~QgsFeatureRequest.destinationCrs`. Otherwise, the rectangle
will use the same CRS as the source layer/provider.
.. seealso:: :py:func:`setFilterRect`
%End
QgsFeatureRequest &setFilterFid( QgsFeatureId fid );
%Docstring
Sets feature ID that should be fetched.
%End
QgsFeatureId filterFid() const;
%Docstring
Gets the feature ID that should be fetched.
%End
QgsFeatureRequest &setFilterFids( const QgsFeatureIds &fids );
%Docstring
Sets feature IDs that should be fetched.
%End
const QgsFeatureIds &filterFids() const;
%Docstring
Gets feature IDs that should be fetched.
%End
QgsFeatureRequest &setInvalidGeometryCheck( InvalidGeometryCheck check );
%Docstring
Sets invalid geometry checking behavior.
.. note::
Invalid geometry checking is not performed when retrieving features
directly from a :py:class:`QgsVectorDataProvider`.
.. seealso:: :py:func:`invalidGeometryCheck`
.. versionadded:: 3.0
%End
InvalidGeometryCheck invalidGeometryCheck() const;
%Docstring
Returns the invalid geometry checking behavior.
.. seealso:: :py:func:`setInvalidGeometryCheck`
.. versionadded:: 3.0
%End
QgsFeatureRequest &setInvalidGeometryCallback( SIP_PYCALLABLE / AllowNone / );
%Docstring
Sets a callback function to use when encountering an invalid geometry and
:py:func:`~QgsFeatureRequest.invalidGeometryCheck` is set to GeometryAbortOnInvalid or GeometrySkipInvalid. This function will be
called using the feature with invalid geometry as a parameter.
.. seealso:: :py:func:`invalidGeometryCallback`
.. versionadded:: 3.0
%End
%MethodCode
Py_BEGIN_ALLOW_THREADS
sipCpp->setInvalidGeometryCallback( [a0]( const QgsFeature &arg )
{
SIP_BLOCK_THREADS
Py_XDECREF( sipCallMethod( NULL, a0, "D", &arg, sipType_QgsFeature, NULL ) );
SIP_UNBLOCK_THREADS
} );
sipRes = sipCpp;
Py_END_ALLOW_THREADS
%End
QgsFeatureRequest &setFilterExpression( const QString &expression );
%Docstring
Set the filter expression. {:py:class:`QgsExpression`}
:param expression: expression string
.. seealso:: :py:func:`filterExpression`
.. seealso:: :py:func:`setExpressionContext`
%End
QgsExpression *filterExpression() const;
%Docstring
Returns the filter expression if set.
.. seealso:: :py:func:`setFilterExpression`
.. seealso:: :py:func:`expressionContext`
%End
QgsFeatureRequest &combineFilterExpression( const QString &expression );
%Docstring
Modifies the existing filter expression to add an additional expression filter. The
filter expressions are combined using AND, so only features matching both
the existing expression and the additional expression will be returned.
.. versionadded:: 2.14
%End
QgsExpressionContext *expressionContext();
%Docstring
Returns the expression context used to evaluate filter expressions.
.. seealso:: :py:func:`setExpressionContext`
.. seealso:: :py:func:`filterExpression`
.. versionadded:: 2.12
%End
QgsFeatureRequest &setExpressionContext( const QgsExpressionContext &context );
%Docstring
Sets the expression context used to evaluate filter expressions.
.. seealso:: :py:func:`expressionContext`
.. seealso:: :py:func:`setFilterExpression`
.. versionadded:: 2.12
%End
QgsFeatureRequest &disableFilter();
%Docstring
Disables filter conditions.
The spatial filter (filterRect) will be kept in place.
:return: The object the method is called on for chaining
.. versionadded:: 2.12
%End
QgsFeatureRequest &addOrderBy( const QString &expression, bool ascending = true );
%Docstring
Adds a new OrderByClause, appending it as the least important one.
:param expression: The expression to use for ordering
:param ascending: If the order should be ascending (1,2,3) or descending (3,2,1)
If the order is ascending, by default nulls are last
If the order is descending, by default nulls are first
.. versionadded:: 2.14
%End
QgsFeatureRequest &addOrderBy( const QString &expression, bool ascending, bool nullsfirst );
%Docstring
Adds a new OrderByClause, appending it as the least important one.
:param expression: The expression to use for ordering
:param ascending: If the order should be ascending (1,2,3) or descending (3,2,1)
:param nullsfirst: If ``True``, NULLS are at the beginning, if ``False``, NULLS are at the end
.. versionadded:: 2.14
%End
OrderBy orderBy() const;
%Docstring
Returns a list of order by clauses specified for this feature request.
.. versionadded:: 2.14
%End
QgsFeatureRequest &setOrderBy( const OrderBy &orderBy );
%Docstring
Set a list of order by clauses.
.. versionadded:: 2.14
%End
QgsFeatureRequest &setLimit( long limit );
%Docstring
Set the maximum number of features to request.
:param limit: maximum number of features, or -1 to request all features.
.. seealso:: :py:func:`limit`
.. versionadded:: 2.14
%End
long limit() const;
%Docstring
Returns the maximum number of features to request, or -1 if no limit set.
.. seealso:: :py:func:`setLimit`
.. versionadded:: 2.14
%End
QgsFeatureRequest &setFlags( QgsFeatureRequest::Flags flags );
%Docstring
Sets flags that affect how features will be fetched
%End
const Flags &flags() const;
QgsFeatureRequest &setSubsetOfAttributes( const QgsAttributeList &attrs );
%Docstring
Set a subset of attributes that will be fetched.
An empty attributes list indicates that no attributes will be fetched.
To revert a call to setSubsetOfAttributes and fetch all available attributes,
the SubsetOfAttributes flag should be removed from the request.
%End
QgsFeatureRequest &setNoAttributes();
%Docstring
Set that no attributes will be fetched.
To revert a call to setNoAttributes and fetch all or some available attributes,
the SubsetOfAttributes flag should be removed from the request.
.. versionadded:: 3.4
%End
QgsAttributeList subsetOfAttributes() const;
%Docstring
Returns the subset of attributes which at least need to be fetched
:return: A list of attributes to be fetched
%End
QgsFeatureRequest &setSubsetOfAttributes( const QStringList &attrNames, const QgsFields &fields );
%Docstring
Sets a subset of attributes by names that will be fetched
%End
QgsFeatureRequest &setSubsetOfAttributes( const QSet<QString> &attrNames, const QgsFields &fields );
%Docstring
Sets a subset of attributes by names that will be fetched
%End
QgsFeatureRequest &setSimplifyMethod( const QgsSimplifyMethod &simplifyMethod );
%Docstring
Set a simplification method for geometries that will be fetched
.. versionadded:: 2.2
%End
const QgsSimplifyMethod &simplifyMethod() const;
%Docstring
Gets simplification method for geometries that will be fetched
.. versionadded:: 2.2
%End
QgsCoordinateReferenceSystem destinationCrs() const;
%Docstring
Returns the destination coordinate reference system for feature's geometries,
or an invalid :py:class:`QgsCoordinateReferenceSystem` if no reprojection will be done
and all features will be left with their original geometry.
.. seealso:: :py:func:`setDestinationCrs`
.. seealso:: :py:func:`transformContext`
.. versionadded:: 3.0
%End
QgsCoordinateTransformContext transformContext() const;
%Docstring
Returns the transform context, for use when a :py:func:`~QgsFeatureRequest.destinationCrs` has been set
and reprojection is required
.. seealso:: :py:func:`setDestinationCrs`
.. seealso:: :py:func:`destinationCrs`
.. versionadded:: 3.0
%End
QgsFeatureRequest &setDestinationCrs( const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &context );
%Docstring
Sets the destination ``crs`` for feature's geometries. If set, all
geometries will be reprojected from their original coordinate reference
system to this desired reference system. If ``crs`` is an invalid
:py:class:`QgsCoordinateReferenceSystem` then no reprojection will be done
and all features will be left with their original geometry.
When a ``crs`` is set using :py:func:`~QgsFeatureRequest.setDestinationCrs`, then any :py:func:`~QgsFeatureRequest.filterRect`
set on the request is expected to be in the same CRS as the destination
CRS.
The feature geometry transformation to the destination CRS is performed
after all filter expressions are tested and any virtual fields are
calculated. Accordingly, any geometric expressions used in
:py:func:`~QgsFeatureRequest.filterExpression` will be performed in the original
source CRS. This ensures consistent results are returned regardless of the
destination CRS. Similarly, virtual field values will be calculated using the
original geometry in the source CRS, so these values are not affected by
any destination CRS transform present in the feature request.
.. seealso:: :py:func:`destinationCrs`
.. versionadded:: 3.0
%End
QgsFeatureRequest &setTransformErrorCallback( SIP_PYCALLABLE / AllowNone / );
%Docstring
Sets a callback function to use when encountering a transform error when iterating
features and a :py:func:`~QgsFeatureRequest.destinationCrs` is set. This function will be
called using the feature which encountered the transform error as a parameter.
.. seealso:: :py:func:`transformErrorCallback`
.. seealso:: :py:func:`setDestinationCrs`
.. versionadded:: 3.0
%End
%MethodCode
Py_BEGIN_ALLOW_THREADS
sipCpp->setTransformErrorCallback( [a0]( const QgsFeature &arg )
{
SIP_BLOCK_THREADS
Py_XDECREF( sipCallMethod( NULL, a0, "D", &arg, sipType_QgsFeature, NULL ) );
SIP_UNBLOCK_THREADS
} );
sipRes = sipCpp;
Py_END_ALLOW_THREADS
%End
bool acceptFeature( const QgsFeature &feature );
%Docstring
Check if a feature is accepted by this requests filter
:param feature: The feature which will be tested
:return: ``True``, if the filter accepts the feature
.. versionadded:: 2.1
%End
int connectionTimeout() const /Deprecated/;
%Docstring
Returns the timeout (in milliseconds) for how long we should wait for a connection if none is available from the pool
at this moment. A negative value (which is set by default) will wait forever.
.. note::
Only works if the provider supports this option.
.. deprecated::
Use :py:func:`~QgsFeatureRequest.timeout` instead.
.. versionadded:: 3.0
%End
QgsFeatureRequest &setConnectionTimeout( int connectionTimeout ) /Deprecated/;
%Docstring
Sets the timeout (in milliseconds) for how long we should wait for a connection if none is available from the pool
at this moment. A negative value (which is set by default) will wait forever.
.. note::
Only works if the provider supports this option.
.. deprecated::
Use :py:func:`~QgsFeatureRequest.setTimeout` instead.
.. versionadded:: 3.0
%End
int timeout() const;
%Docstring
Returns the timeout (in milliseconds) for the maximum time we should wait during feature requests before a
feature is returned. A negative value (which is set by default) will wait forever.
.. note::
Only works if the provider supports this option.
.. versionadded:: 3.4
%End
QgsFeatureRequest &setTimeout( int timeout );
%Docstring
Sets the ``timeout`` (in milliseconds) for the maximum time we should wait during feature requests before a
feature is returned. A negative value (which is set by default) will wait forever.
.. note::
Only works if the provider supports this option.
.. versionadded:: 3.4
%End
bool requestMayBeNested() const;
%Docstring
In case this request may be run nested within another already running
iteration on the same connection, set this to ``True``.
If this flag is ``True``, this request will be able to make use of "spare"
connections to avoid deadlocks.
For example, this should be set on requests that are issued from an
expression function.
.. versionadded:: 3.4
%End
QgsFeatureRequest &setRequestMayBeNested( bool requestMayBeNested );
%Docstring
In case this request may be run nested within another already running
iteration on the same connection, set this to ``True``.
If this flag is ``True``, this request will be able to make use of "spare"
connections to avoid deadlocks.
For example, this should be set on requests that are issued from an
expression function.
.. versionadded:: 3.4
%End
protected:
};
QFlags<QgsFeatureRequest::Flag> operator|(QgsFeatureRequest::Flag f1, QFlags<QgsFeatureRequest::Flag> f2);
class QgsAbstractFeatureSource
{
%Docstring
Base class that can be used for any class that is capable of returning features
.. versionadded:: 2.4
%End
%TypeHeaderCode
#include "qgsfeaturerequest.h"
%End
public:
virtual ~QgsAbstractFeatureSource();
virtual QgsFeatureIterator getFeatures( const QgsFeatureRequest &request = QgsFeatureRequest() ) = 0 /TransferBack/;
%Docstring
Gets an iterator for features matching the specified request
:param request: The request
:return: A feature iterator
%End
protected:
void iteratorOpened( QgsAbstractFeatureIterator *it );
void iteratorClosed( QgsAbstractFeatureIterator *it );
};
/************************************************************************
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* src/core/qgsfeaturerequest.h *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
************************************************************************/