QGIS API Documentation 3.27.0-Master (f261cc1f8b)
qgsfieldconstraints.h
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1/***************************************************************************
2 qgsfieldconstraints.h
3 ---------------------
4 Date : November 2016
5 Copyright : (C) 2016 by Nyall Dawson
6 email : nyall dot dawson at gmail dot com
7 ***************************************************************************
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 ***************************************************************************/
15
16#ifndef QGSFIELDCONSTRAINTS_H
17#define QGSFIELDCONSTRAINTS_H
18
19#include <QString>
20#include <QHash>
21#include <QObject>
22
23#include "qgis_core.h"
24
32class CORE_EXPORT QgsFieldConstraints
33{
34 Q_GADGET
35
36 Q_PROPERTY( Constraints constraints READ constraints )
37
38 public:
39
44 {
45 ConstraintNotNull = 1,
46 ConstraintUnique = 1 << 1,
47 ConstraintExpression = 1 << 2,
48 };
49 Q_DECLARE_FLAGS( Constraints, Constraint )
50
51
55 {
56 ConstraintOriginNotSet = 0,
59 };
60
65 {
66 ConstraintStrengthNotSet = 0,
69 };
70
75
81 Constraints constraints() const { return mConstraints; }
82
88 ConstraintOrigin constraintOrigin( Constraint constraint ) const;
89
96 ConstraintStrength constraintStrength( Constraint constraint ) const;
97
103 void setConstraintStrength( Constraint constraint, ConstraintStrength strength );
104
110 void setConstraint( Constraint constraint, ConstraintOrigin origin = ConstraintOriginLayer );
111
117 void removeConstraint( Constraint constraint ) { mConstraints &= ~constraint; }
118
125 QString constraintExpression() const;
126
133 QString constraintDescription() const { return mExpressionConstraintDescription; }
134
142 void setConstraintExpression( const QString &expression, const QString &description = QString() );
143
150 QString domainName() const { return mDomainName; }
151
158 void setDomainName( const QString &domain ) { mDomainName = domain; }
159
160 // TODO c++20 - replace with = default
161 bool operator==( const QgsFieldConstraints &other ) const;
162
163 private:
164
166 Constraints mConstraints;
167
169 QHash< Constraint, ConstraintOrigin > mConstraintOrigins;
170
172 QHash< Constraint, ConstraintStrength > mConstraintStrengths;
173
175 QString mExpressionConstraint;
176
178 QString mExpressionConstraintDescription;
179
181 QString mDomainName;
182};
183
184Q_DECLARE_OPERATORS_FOR_FLAGS( QgsFieldConstraints::Constraints )
185
186#endif //QGSFIELDCONSTRAINTS_H
Stores information about constraints which may be present on a field.
ConstraintStrength
Strength of constraints.
@ ConstraintStrengthSoft
User is warned if constraint is violated but feature can still be accepted.
@ ConstraintStrengthHard
Constraint must be honored before feature can be accepted.
ConstraintOrigin
Origin of constraints.
@ ConstraintOriginProvider
Constraint was set at data provider.
@ ConstraintOriginLayer
Constraint was set by layer.
void setDomainName(const QString &domain)
Sets the associated field domain name, for providers which support field domains.
QString domainName() const
Returns the associated field domain name, for providers which support field domains.
Constraint
Constraints which may be present on a field.
Constraints constraints() const
Returns any constraints which are present for the field.
void removeConstraint(Constraint constraint)
Removes a constraint from the field.
QString constraintDescription() const
Returns the descriptive name for the constraint expression.
QgsFieldConstraints()
Constructor for QgsFieldConstraints.
bool operator==(const QgsFeatureIterator &fi1, const QgsFeatureIterator &fi2)
Q_DECLARE_OPERATORS_FOR_FLAGS(QgsField::ConfigurationFlags) CORE_EXPORT QDataStream &operator<<(QDataStream &out
Writes the field to stream out. QGIS version compatibility is not guaranteed.