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qgsfeature.h
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qgsfeature.h
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/***************************************************************************
qgsfeature.h - Spatial Feature Class
--------------------------------------
Date : 09-Sep-2003
Copyright : (C) 2003 by Gary E.Sherman
email : sherman at mrcc.com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSFEATURE_H
#define QGSFEATURE_H
#include "qgis_core.h"
#include "qgis.h"
#include <QExplicitlySharedDataPointer>
#include <QList>
#include <QMap>
#include <QSet>
#include <QString>
#include <QVariant>
#include <QVector>
#include "qgsattributes.h"
#include "qgsfields.h"
#include "qgsfeatureid.h"
#include <memory>
class QgsFeature;
class QgsFeaturePrivate;
class QgsField;
class QgsGeometry;
class QgsRectangle;
class QgsAbstractGeometry;
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests in testqgsfeature.cpp.
* See details in QEP #17
****************************************************************************/
/**
* \ingroup core
* The feature class encapsulates a single feature including its id,
* geometry and a list of field/values attributes.
* \note QgsFeature objects are implicitly shared.
*/
class CORE_EXPORT QgsFeature
{
#ifdef SIP_RUN
#if (SIP_VERSION >= 0x040900 && SIP_VERSION < 0x040c01)
#define sipType_QVariant ((sipWrapperType *) sipTypeAsPyTypeObject (sipType_QVariant))
#endif
#endif
Q_GADGET
Q_PROPERTY( QgsFeatureId id READ id WRITE setId )
Q_PROPERTY( QgsAttributes attributes READ attributes WRITE setAttributes )
Q_PROPERTY( QgsFields fields READ fields WRITE setFields )
Q_PROPERTY( QgsGeometry geometry READ geometry WRITE setGeometry )
public:
#ifdef SIP_RUN
SIP_PYOBJECT __iter__();
% MethodCode
QgsAttributes attributes = sipCpp->attributes();
PyObject *attrs = sipConvertFromType( &attributes, sipType_QgsAttributes, Py_None );
sipRes = PyObject_GetIter( attrs );
% End
SIP_PYOBJECT __getitem__( int key );
% MethodCode
QgsAttributes attrs = sipCpp->attributes();
if ( a0 < 0 || a0 >= attrs.count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
QVariant *v = new QVariant( attrs.at( a0 ) );
sipRes = sipConvertFromNewType( v, sipType_QVariant, Py_None );
}
% End
SIP_PYOBJECT __getitem__( const QString &name );
% MethodCode
int fieldIdx = sipCpp->fieldNameIndex( *a0 );
if ( fieldIdx == -1 )
{
PyErr_SetString( PyExc_KeyError, a0->toAscii() );
sipIsErr = 1;
}
else
{
QVariant *v = new QVariant( sipCpp->attribute( fieldIdx ) );
sipRes = sipConvertFromNewType( v, sipType_QVariant, Py_None );
}
% End
void __setitem__( int key, QVariant value / GetWrapper / );
% MethodCode
bool rv;
if ( a1Wrapper == Py_None )
{
rv = sipCpp->setAttribute( a0, QVariant( QVariant::Int ) );
}
else
{
rv = sipCpp->setAttribute( a0, *a1 );
}
if ( !rv )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
% End
void __setitem__( const QString &key, QVariant value / GetWrapper / );
% MethodCode
int fieldIdx = sipCpp->fieldNameIndex( *a0 );
if ( fieldIdx == -1 )
{
PyErr_SetString( PyExc_KeyError, a0->toAscii() );
sipIsErr = 1;
}
else
{
if ( a1Wrapper == Py_None )
{
sipCpp->setAttribute( *a0, QVariant( QVariant::Int ) );
}
else
{
sipCpp->setAttribute( fieldIdx, *a1 );
}
}
% End
void __delitem__( int key );
% MethodCode
if ( a0 >= 0 && a0 < sipCpp->attributes().count() )
sipCpp->deleteAttribute( a0 );
else
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
% End
void __delitem__( const QString &name );
% MethodCode
int fieldIdx = sipCpp->fieldNameIndex( *a0 );
if ( fieldIdx == -1 )
{
PyErr_SetString( PyExc_KeyError, a0->toAscii() );
sipIsErr = 1;
}
else
sipCpp->deleteAttribute( fieldIdx );
% End
#endif
/**
* Constructor for QgsFeature
* \param id feature id
*/
#ifndef SIP_RUN
QgsFeature( QgsFeatureId id = QgsFeatureId() );
#else
QgsFeature( qint64 id = 0 );
#endif
/**
* Constructor for QgsFeature
* \param fields feature's fields
* \param id feature id
*/
#ifndef SIP_RUN
QgsFeature( const QgsFields &fields, QgsFeatureId id = QgsFeatureId() );
#else
QgsFeature( const QgsFields &fields, qint64 id = 0 );
#endif
/**
* Copy constructor
*/
QgsFeature( const QgsFeature &rhs );
/**
* Assignment operator
*/
QgsFeature &operator=( const QgsFeature &rhs ) SIP_SKIP;
/**
* Compares two features
*/
bool operator==( const QgsFeature &other ) const SIP_SKIP;
/**
* Compares two features
*/
bool operator!=( const QgsFeature &other ) const SIP_SKIP;
virtual ~QgsFeature();
/**
* Gets the feature ID for this feature.
* \returns feature ID
* \see setId()
*/
QgsFeatureId id() const;
/**
* Sets the feature ID for this feature.
* \param id feature id
* \see id
*/
void setId( QgsFeatureId id );
/**
* Returns the feature's attributes.
* \returns list of feature's attributes
* \see setAttributes
* \note Alternatively in Python: iterate feature, eg. @code [attr for attr in feature] @endcode
* \since QGIS 2.9
*/
QgsAttributes attributes() const;
/**
* Sets the feature's attributes.
* The feature will be valid after.
* \param attrs attribute list
* \see setAttribute
* \see attributes
*/
void setAttributes( const QgsAttributes &attrs );
/**
* Set an attribute's value by field index.
* The feature will be valid if it was successful.
* \param field the index of the field to set
* \param attr the value of the attribute
* \returns false, if the field index does not exist
* \note For Python: raises a KeyError exception instead of returning false
* \note Alternatively in Python: @code feature[field] = attr @endcode
* \see setAttributes
*/
#ifndef SIP_RUN
bool setAttribute( int field, const QVariant &attr );
#else
bool setAttribute( int field, const QVariant &attr / GetWrapper / );
% MethodCode
bool rv;
if ( a1Wrapper == Py_None )
{
rv = sipCpp->setAttribute( a0, QVariant( QVariant::Int ) );
}
else
{
rv = sipCpp->setAttribute( a0, *a1 );
}
if ( !rv )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
sipRes = rv;
% End
#endif
/**
* Initialize this feature with the given number of fields. Discard any previously set attribute data.
* \param fieldCount Number of fields to initialize
*/
void initAttributes( int fieldCount );
/**
* Deletes an attribute and its value.
* \param field the index of the field
* \see setAttribute
* \note For Python: raises a KeyError exception if the field is not found
* \note Alternatively in Python: @code del feature[field] @endcode
*/
void deleteAttribute( int field );
#ifdef SIP_RUN
% MethodCode
if ( a0 >= 0 && a0 < sipCpp->attributes().count() )
sipCpp->deleteAttribute( a0 );
else
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
% End
#endif
/**
* Returns the validity of this feature. This is normally set by
* the provider to indicate some problem that makes the feature
* invalid or to indicate a null feature.
* \see setValid
*/
bool isValid() const;
/**
* Sets the validity of the feature.
* \param validity set to true if feature is valid
* \see isValid
*/
void setValid( bool validity );
/**
* Returns true if the feature has an associated geometry.
* \see geometry()
* \since QGIS 3.0.
*/
bool hasGeometry() const;
/**
* Returns the geometry associated with this feature. If the feature has no geometry,
* an empty QgsGeometry object will be returned.
* \see hasGeometry()
* \see setGeometry()
*/
QgsGeometry geometry() const;
/**
* Set the feature's geometry. The feature will be valid after.
* \param geometry new feature geometry
* \see geometry()
* \see clearGeometry()
*/
void setGeometry( const QgsGeometry &geometry );
/**
* Set the feature's \a geometry. Ownership of the geometry is transferred to the feature.
* The feature will be made valid after calling this method.
* \see geometry()
* \see clearGeometry()
* \since QGIS 3.4.3
*/
#ifndef SIP_RUN
void setGeometry( std::unique_ptr< QgsAbstractGeometry > geometry );
#else
void setGeometry( QgsAbstractGeometry *geometry SIP_TRANSFER );
% MethodCode
sipCpp->setGeometry( std::unique_ptr< QgsAbstractGeometry>( a0 ) );
% End
#endif
/**
* Removes any geometry associated with the feature.
* \see setGeometry()
* \see hasGeometry()
* \since QGIS 3.0
*/
void clearGeometry();
/**
* Assign a field map with the feature to allow attribute access by attribute name.
* \param fields The attribute fields which this feature holds
* \param initAttributes If true, attributes are initialized. Clears any data previously assigned.
* C++: Defaults to false
* Python: Defaults to true
* \see fields
* \since QGIS 2.9
*/
void setFields( const QgsFields &fields, bool initAttributes = false SIP_PYARGDEFAULT( true ) );
/**
* Returns the field map associated with the feature.
* \see setFields
*/
QgsFields fields() const;
/**
* Insert a value into attribute. Returns false if attribute name could not be converted to index.
* Field map must be associated using setFields() before this method can be used.
* The feature will be valid if it was successful
* \param name The name of the field to set
* \param value The value to set
* \returns false if attribute name could not be converted to index (C++ only)
* \note For Python: raises a KeyError exception instead of returning false
* \note Alternatively in Python: @code feature[name] = attr @endcode
* \see setFields
*/
#ifndef SIP_RUN
bool setAttribute( const QString &name, const QVariant &value );
#else
void setAttribute( const QString &name, const QVariant &value / GetWrapper / );
% MethodCode
int fieldIdx = sipCpp->fieldNameIndex( *a0 );
if ( fieldIdx == -1 )
{
PyErr_SetString( PyExc_KeyError, a0->toAscii() );
sipIsErr = 1;
}
else
{
if ( a1Wrapper == Py_None )
{
sipCpp->setAttribute( *a0, QVariant( QVariant::Int ) );
}
else
{
sipCpp->setAttribute( fieldIdx, *a1 );
}
}
% End
#endif
/**
* Removes an attribute value by field name. Field map must be associated using setFields()
* before this method can be used.
* \param name The name of the field to delete
* \returns false if attribute name could not be converted to index (C++ only)
* \note For Python: raises a KeyError exception instead of returning false
* \note Alternatively in Python: @code del feature[name] @endcode
* \see setFields
*/
bool deleteAttribute( const QString &name );
#ifdef SIP_RUN
% MethodCode
int fieldIdx = sipCpp->fieldNameIndex( *a0 );
if ( fieldIdx == -1 )
{
PyErr_SetString( PyExc_KeyError, a0->toAscii() );
sipIsErr = 1;
sipRes = false;
}
else
{
sipCpp->deleteAttribute( fieldIdx );
sipRes = true;
}
% End
#endif
/**
* Lookup attribute value from attribute name. Field map must be associated using setFields()
* before this method can be used.
* \param name The name of the attribute to get
* \returns The value of the attribute (C++: Invalid variant if no such name exists )
* \note For Python: raises a KeyError exception if the field is not found
* \note Alternatively in Python: @code feature[name] @endcode
* \see setFields
*/
#ifndef SIP_RUN
QVariant attribute( const QString &name ) const;
#else
SIP_PYOBJECT attribute( const QString &name ) const;
% MethodCode
int fieldIdx = sipCpp->fieldNameIndex( *a0 );
if ( fieldIdx == -1 )
{
PyErr_SetString( PyExc_KeyError, a0->toAscii() );
sipIsErr = 1;
}
else
{
QVariant *v = new QVariant( sipCpp->attribute( fieldIdx ) );
sipRes = sipConvertFromNewType( v, sipType_QVariant, Py_None );
}
% End
#endif
/**
* Lookup attribute value from its index. Field map must be associated using setFields()
* before this method can be used.
* \param fieldIdx The index of the attribute to get
* \returns The value of the attribute (C++: Invalid variant if no such index exists )
* \note For Python: raises a KeyError exception if the field is not found
* \note Alternatively in Python: @code feature[fieldIdx] @endcode
* \see setFields
*/
#ifndef SIP_RUN
QVariant attribute( int fieldIdx ) const;
#else
SIP_PYOBJECT attribute( int fieldIdx ) const;
% MethodCode
{
if ( a0 < 0 || a0 >= sipCpp->attributes().count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
QVariant *v = new QVariant( sipCpp->attribute( a0 ) );
sipRes = sipConvertFromNewType( v, sipType_QVariant, Py_None );
}
}
% End
#endif
/**
* Utility method to get attribute index from name. Field map must be associated using setFields()
* before this method can be used.
* \param fieldName name of field to get attribute index of
* \returns -1 if field does not exist or field map is not associated.
* \see setFields
*/
int fieldNameIndex( const QString &fieldName ) const;
//! Allows direct construction of QVariants from features.
operator QVariant() const
{
return QVariant::fromValue( *this );
}
private:
QExplicitlySharedDataPointer<QgsFeaturePrivate> d;
}; // class QgsFeature
//! Writes the feature to stream out. QGIS version compatibility is not guaranteed.
CORE_EXPORT QDataStream &operator<<( QDataStream &out, const QgsFeature &feature ) SIP_SKIP;
//! Reads a feature from stream in into feature. QGIS version compatibility is not guaranteed.
CORE_EXPORT QDataStream &operator>>( QDataStream &in, QgsFeature &feature ) SIP_SKIP;
// key = feature id, value = changed attributes
#ifndef SIP_RUN
typedef QMap<QgsFeatureId, QgsAttributeMap> QgsChangedAttributesMap;
#else
typedef QMap<qint64, QMap<int, QVariant> > QgsChangedAttributesMap;
#endif
#include "qgsgeometry.h"
// key = feature id, value = changed geometry
#ifndef SIP_RUN
typedef QMap<QgsFeatureId, QgsGeometry> QgsGeometryMap;
#else
typedef QMap<qint64, QgsGeometry> QgsGeometryMap;
#endif
typedef QList<QgsFeature> QgsFeatureList;
uint qHash( const QgsFeature &key, uint seed = 0 ) SIP_SKIP;
Q_DECLARE_METATYPE( QgsFeature )
Q_DECLARE_METATYPE( QgsFeatureList )
#endif