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qgsfields.h
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qgsfields.h
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/***************************************************************************
qgsfields.h - QgsFields
---------------------
begin : 22.9.2016
copyright : (C) 2016 by Matthias Kuhn
email : matthias@opengis.ch
***************************************************************************
* *
* 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 QGSFIELDS_H
#define QGSFIELDS_H
#include "qgis.h"
#include "qgis_core.h"
#include "qgsfield.h"
class QgsFieldsPrivate;
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests in testqgsfields.cpp.
* See details in QEP #17
****************************************************************************/
/**
* \class QgsFields
* \ingroup core
* Container of fields for a vector layer.
*
* In addition to storing a list of QgsField instances, it also:
* - allows quick lookups of field names to index in the list
* - keeps track of where the field definition comes from (vector data provider, joined layer or newly added from an editing operation)
* \note QgsFields objects are implicitly shared.
*/
class CORE_EXPORT QgsFields
{
public:
enum FieldOrigin
{
OriginUnknown, //!< It has not been specified where the field comes from
OriginProvider, //!< Field comes from the underlying data provider of the vector layer (originIndex = index in provider's fields)
OriginJoin, //!< Field comes from a joined layer (originIndex / 1000 = index of the join, originIndex % 1000 = index within the join)
OriginEdit, //!< Field has been temporarily added in editing mode (originIndex = index in the list of added attributes)
OriginExpression //!< Field is calculated from an expression
};
#ifndef SIP_RUN
typedef struct Field
{
Field()
{}
Field( const QgsField &f, FieldOrigin o, int oi )
: field( f )
, origin( o )
, originIndex( oi )
{}
//! \since QGIS 2.6
bool operator==( const Field &other ) const { return field == other.field && origin == other.origin && originIndex == other.originIndex; }
//! \since QGIS 2.6
bool operator!=( const Field &other ) const { return !( *this == other ); }
QgsField field; //!< Field
FieldOrigin origin = OriginUnknown ; //!< Origin of the field
int originIndex = -1 ; //!< Index specific to the origin
} Field;
#endif
/**
* Constructor for an empty field container
*/
QgsFields();
/**
* Copy constructor
*/
QgsFields( const QgsFields &other );
/**
* Assignment operator
*/
QgsFields &operator =( const QgsFields &other ) SIP_SKIP;
virtual ~QgsFields();
//! Removes all fields
void clear();
//! Appends a field. The field must have unique name, otherwise it is rejected (returns false)
bool append( const QgsField &field, FieldOrigin origin = OriginProvider, int originIndex = -1 );
/**
* Renames a name of field. The field must have unique name, otherwise change is rejected (returns false)
* \since QGIS 3.6
*/
bool rename( int fieldIdx, const QString &name );
//! Appends an expression field. The field must have unique name, otherwise it is rejected (returns false)
bool appendExpressionField( const QgsField &field, int originIndex );
//! Removes a field with the given index
void remove( int fieldIdx );
#ifdef SIP_RUN
% MethodCode
if ( a0 < 0 || a0 >= sipCpp->count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
sipCpp->remove( a0 );
}
% End
#endif
//! Extends with fields from another QgsFields container
void extend( const QgsFields &other );
//! Checks whether the container is empty
bool isEmpty() const;
//! Returns number of items
int count() const;
#ifdef SIP_RUN
int __len__() const;
% MethodCode
sipRes = sipCpp->count();
% End
//! Ensures that bool(obj) returns true (otherwise __len__() would be used)
int __bool__() const;
% MethodCode
sipRes = true;
% End
#endif
//! Returns number of items
int size() const;
/**
* Returns a list with field names
* \since QGIS 3.0
*/
QStringList names() const;
/**
* Returns if a field index is valid
* \param i Index of the field which needs to be checked
* \returns True if the field exists
*/
bool exists( int i ) const;
#ifndef SIP_RUN
//! Gets field at particular index (must be in range 0..N-1)
QgsField operator[]( int i ) const;
#endif
//! Gets field at particular index (must be in range 0..N-1)
QgsField &operator[]( int i ) SIP_FACTORY;
#ifdef SIP_RUN
% MethodCode
SIP_SSIZE_T idx = sipConvertFromSequenceIndex( a0, sipCpp->count() );
if ( idx < 0 )
sipIsErr = 1;
else
sipRes = new QgsField( sipCpp->operator[]( idx ) );
% End
#endif
//! Gets field at particular index (must be in range 0..N-1)
QgsField at( int i ) const SIP_FACTORY;
#ifdef SIP_RUN
% MethodCode
if ( a0 < 0 || a0 >= sipCpp->count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
sipRes = new QgsField( sipCpp->at( a0 ) );
}
% End
#endif
//! Gets field at particular index (must be in range 0..N-1)
QgsField field( int fieldIdx ) const SIP_FACTORY;
#ifdef SIP_RUN
% MethodCode
if ( a0 < 0 || a0 >= sipCpp->count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
sipRes = new QgsField( sipCpp->field( a0 ) );
}
% End
#endif
//! Gets field with matching name
QgsField field( const QString &name ) const SIP_FACTORY;
#ifdef SIP_RUN
% MethodCode
int fieldIdx = sipCpp->indexFromName( *a0 );
if ( fieldIdx == -1 )
{
PyErr_SetString( PyExc_KeyError, a0->toAscii() );
sipIsErr = 1;
}
else
{
sipRes = new QgsField( sipCpp->field( *a0 ) );
}
% End
#endif
//! Gets field's origin (value from an enumeration)
FieldOrigin fieldOrigin( int fieldIdx ) const;
#ifdef SIP_RUN
% MethodCode
if ( a0 < 0 || a0 >= sipCpp->count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
sipRes = sipCpp->fieldOrigin( a0 );
}
% End
#endif
//! Gets field's origin index (its meaning is specific to each type of origin)
int fieldOriginIndex( int fieldIdx ) const;
#ifdef SIP_RUN
% MethodCode
if ( a0 < 0 || a0 >= sipCpp->count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
sipRes = sipCpp->fieldOriginIndex( a0 );
}
% End
#endif
/**
* Gets the field index from the field name.
* This method is case sensitive and only matches the data source
* name of the field.
* Alias for indexOf
*
* \param fieldName The name of the field.
*
* \returns The field index if found or -1 in case it cannot be found.
* \see lookupField For a more tolerant alternative.
*/
int indexFromName( const QString &fieldName ) const;
/**
* Gets the field index from the field name.
* This method is case sensitive and only matches the data source
* name of the field.
*
* \param fieldName The name of the field.
*
* \returns The field index if found or -1 in case it cannot be found.
* \see lookupField For a more tolerant alternative.
* \since QGIS 3.0
*/
int indexOf( const QString &fieldName ) const;
/**
* Looks up field's index from the field name.
* This method matches in the following order:
*
* 1. The exact field name taking case sensitivity into account
* 2. Looks for the field name by case insensitive comparison
* 3. The field alias (case insensitive)
*
* \param fieldName The name to look for.
*
* \returns The field index if found or -1 in case it cannot be found.
* \see indexFromName For a more performant and precise but less tolerant alternative.
* \since QGIS 2.4
*/
int lookupField( const QString &fieldName ) const;
/**
* Utility function to get list of attribute indexes
* \since QGIS 2.4
*/
QgsAttributeList allAttributesList() const;
//! Utility function to return a list of QgsField instances
QList<QgsField> toList() const;
//! \since QGIS 2.6
bool operator==( const QgsFields &other ) const;
//! \since QGIS 2.6
bool operator!=( const QgsFields &other ) const { return !( *this == other ); }
/**
* Returns an icon corresponding to a field index, based on the field's type and source
* \since QGIS 2.14
*/
QIcon iconForField( int fieldIdx ) const SIP_FACTORY;
#ifdef SIP_RUN
% MethodCode
if ( a0 < 0 || a0 >= sipCpp->count() )
{
PyErr_SetString( PyExc_KeyError, QByteArray::number( a0 ) );
sipIsErr = 1;
}
else
{
sipRes = new QIcon( sipCpp->iconForField( a0 ) );
}
% End
#endif
//! Allows direct construction of QVariants from fields.
operator QVariant() const
{
return QVariant::fromValue( *this );
}
#ifdef SIP_RUN
void __setitem__( int key, const QgsField &field );
% MethodCode
int idx = ( int )sipConvertFromSequenceIndex( a0, sipCpp->count() );
if ( idx < 0 )
sipIsErr = 1;
else
( *sipCpp )[idx] = *a1;
% End
#endif
#ifndef SIP_RUN
///@cond PRIVATE
class const_iterator;
class iterator
{
public:
QgsFields::Field *d = nullptr;
typedef std::random_access_iterator_tag iterator_category;
typedef qptrdiff difference_type;
inline iterator()
{}
inline iterator( QgsFields::Field *n )
: d( n )
{}
inline QgsField &operator*() const { return d->field; }
inline QgsField *operator->() const { return &d->field; }
inline QgsField &operator[]( difference_type j ) const { return d[j].field; }
inline bool operator==( const iterator &o ) const noexcept { return d == o.d; } // clazy:exclude=function-args-by-value
inline bool operator!=( const iterator &o ) const noexcept { return d != o.d; } // clazy:exclude=function-args-by-value
inline bool operator<( const iterator &other ) const noexcept { return d < other.d; } // clazy:exclude=function-args-by-value
inline bool operator<=( const iterator &other ) const noexcept { return d <= other.d; } // clazy:exclude=function-args-by-value
inline bool operator>( const iterator &other ) const noexcept { return d > other.d; } // clazy:exclude=function-args-by-value
inline bool operator>=( const iterator &other ) const noexcept { return d >= other.d; } // clazy:exclude=function-args-by-value
inline iterator &operator++() { ++d; return *this; }
inline iterator operator++( int ) { QgsFields::Field *n = d; ++d; return n; }
inline iterator &operator--() { d--; return *this; }
inline iterator operator--( int ) { QgsFields::Field *n = d; d--; return n; }
inline iterator &operator+=( difference_type j ) { d += j; return *this; }
inline iterator &operator-=( difference_type j ) { d -= j; return *this; }
inline iterator operator+( difference_type j ) const { return iterator( d + j ); }
inline iterator operator-( difference_type j ) const { return iterator( d - j ); }
inline int operator-( iterator j ) const { return int( d - j.d ); }
};
friend class iterator;
class const_iterator // clazy:exclude=rule-of-three
{
public:
const QgsFields::Field *d = nullptr;
typedef std::random_access_iterator_tag iterator_category;
typedef qptrdiff difference_type;
inline const_iterator()
{}
inline const_iterator( const QgsFields::Field *f )
: d( f ) {}
inline const_iterator( const const_iterator &o )
: d( o.d ) {}
inline explicit const_iterator( const iterator &o ) // clazy:exclude=function-args-by-value
: d( o.d ) {}
inline const QgsField &operator*() const { return d->field; }
inline const QgsField *operator->() const { return &d->field; }
inline const QgsField &operator[]( difference_type j ) const noexcept { return d[j].field; }
inline bool operator==( const const_iterator &o ) const noexcept { return d == o.d; }
inline bool operator!=( const const_iterator &o ) const noexcept { return d != o.d; }
inline bool operator<( const const_iterator &other ) const noexcept { return d < other.d; }
inline bool operator<=( const const_iterator &other ) const noexcept { return d <= other.d; }
inline bool operator>( const const_iterator &other ) const noexcept { return d > other.d; }
inline bool operator>=( const const_iterator &other ) const noexcept { return d >= other.d; }
inline const_iterator &operator++() { ++d; return *this; }
inline const_iterator operator++( int ) { const QgsFields::Field *n = d; ++d; return n; }
inline const_iterator &operator--() { d--; return *this; }
inline const_iterator operator--( int ) { const QgsFields::Field *n = d; --d; return n; }
inline const_iterator &operator+=( difference_type j ) { d += j; return *this; }
inline const_iterator &operator-=( difference_type j ) { d -= j; return *this; }
inline const_iterator operator+( difference_type j ) const { return const_iterator( d + j ); }
inline const_iterator operator-( difference_type j ) const { return const_iterator( d - j ); }
inline int operator-( const_iterator j ) const { return int( d - j.d ); } // clazy:exclude=function-args-by-ref
};
friend class const_iterator;
///@endcond
/**
* Returns a const STL-style iterator pointing to the first item in the list.
*
* \note not available in Python bindings
* \since QGIS 2.16
*/
const_iterator constBegin() const noexcept;
/**
* Returns a const STL-style iterator pointing to the imaginary item after the last item in the list.
*
* \note not available in Python bindings
* \since QGIS 2.16
*/
const_iterator constEnd() const noexcept;
/**
* Returns a const STL-style iterator pointing to the first item in the list.
*
* \note not available in Python bindings
* \since QGIS 2.16
*/
const_iterator begin() const noexcept;
/**
* Returns a const STL-style iterator pointing to the imaginary item after the last item in the list.
*
* \note not available in Python bindings
* \since QGIS 2.16
*/
const_iterator end() const noexcept;
/**
* Returns an STL-style iterator pointing to the first item in the list.
*
* \note not available in Python bindings
* \since QGIS 2.16
*/
iterator begin();
/**
* Returns an STL-style iterator pointing to the imaginary item after the last item in the list.
*
* \note not available in Python bindings
* \since QGIS 2.16
*/
iterator end();
#endif
private:
QSharedDataPointer<QgsFieldsPrivate> d;
};
Q_DECLARE_METATYPE( QgsFields )
//! Writes the fields to stream out. QGIS version compatibility is not guaranteed.
CORE_EXPORT QDataStream &operator<<( QDataStream &out, const QgsFields &fields );
//! Reads fields from stream in into fields. QGIS version compatibility is not guaranteed.
CORE_EXPORT QDataStream &operator>>( QDataStream &in, QgsFields &fields );
#endif // QGSFIELDS_H