qgsfield.h

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/***************************************************************************
               qgsfield.h - Describes a field in a layer or table
                     --------------------------------------
               Date                 : 01-Jan-2004
               Copyright            : (C) 2004 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 QGSFIELD_H
#define QGSFIELD_H
 
#include <QString>
#include <QVariant>
#include <QVector>
#include <QSharedDataPointer>
#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgis.h"
 
typedef QList<int> QgsAttributeList SIP_SKIP;
 
/***************************************************************************
 * This class is considered CRITICAL and any change MUST be accompanied with
 * full unit tests in testqgsfield.cpp.
 * See details in QEP #17
 ****************************************************************************/
 
#include "qgseditorwidgetsetup.h"
#include "qgsfieldconstraints.h"
#include "qgsdefaultvalue.h"
#include "qgis.h"
 
class QgsFieldPrivate;
 
class CORE_EXPORT QgsField
{
    Q_GADGET
 
    Q_PROPERTY( bool isNumeric READ isNumeric )
    Q_PROPERTY( bool isDateOrTime READ isDateOrTime )
    Q_PROPERTY( int length READ length WRITE setLength )
    Q_PROPERTY( int precision READ precision WRITE setPrecision )
    Q_PROPERTY( QVariant::Type type READ type WRITE setType )
    Q_PROPERTY( QString comment READ comment WRITE setComment )
    Q_PROPERTY( QString name READ name WRITE setName )
    Q_PROPERTY( QString alias READ alias WRITE setAlias )
    Q_PROPERTY( QgsDefaultValue defaultValueDefinition READ defaultValueDefinition WRITE setDefaultValueDefinition )
    Q_PROPERTY( QgsFieldConstraints constraints READ constraints WRITE setConstraints )
    Q_PROPERTY( Qgis::FieldConfigurationFlags configurationFlags READ configurationFlags WRITE setConfigurationFlags )
    Q_PROPERTY( bool isReadOnly READ isReadOnly WRITE setReadOnly )
 
  public:
 
    QgsField( const QString &name = QString(),
              QVariant::Type type = QVariant::Invalid,
              const QString &typeName = QString(),
              int len = 0,
              int prec = 0,
              const QString &comment = QString(),
              QVariant::Type subType = QVariant::Invalid );
 
    QgsField( const QgsField &other );
 
    QgsField &operator =( const QgsField &other ) SIP_SKIP;
 
    virtual ~QgsField();
 
    bool operator==( const QgsField &other ) const;
    bool operator!=( const QgsField &other ) const;
 
    QString name() const;
 
    QString displayName() const;
 
    QString displayNameWithAlias() const;
 
    QString displayType( bool showConstraints = false ) const;
 
    QString friendlyTypeString() const;
 
    QVariant::Type type() const;
 
    QVariant::Type subType() const;
 
    QString typeName() const;
 
    int length() const;
 
    int precision() const;
 
    QString comment() const;
 
    QMap< int, QVariant > metadata() const;
 
    QVariant metadata( Qgis::FieldMetadataProperty property ) const SIP_SKIP;
 
    QVariant metadata( int property ) const;
 
    void setMetadata( const QMap< int, QVariant > metadata );
 
    void setMetadata( Qgis::FieldMetadataProperty property, const QVariant &value ) SIP_SKIP;
 
    void setMetadata( int property, const QVariant &value );
 
    bool isNumeric() const;
 
    bool isDateOrTime() const;
 
    void setName( const QString &name );
 
    void setType( QVariant::Type type );
 
    void setSubType( QVariant::Type subType );
 
    void setTypeName( const QString &typeName );
 
    void setLength( int len );
 
    void setPrecision( int precision );
 
    void setComment( const QString &comment );
 
    QgsDefaultValue defaultValueDefinition() const;
 
    void setDefaultValueDefinition( const QgsDefaultValue &defaultValueDefinition );
 
    const QgsFieldConstraints &constraints() const;
 
    void setConstraints( const QgsFieldConstraints &constraints );
 
    QString alias() const;
 
    void setAlias( const QString &alias );
 
    Qgis::FieldConfigurationFlags configurationFlags() const;
 
    void setConfigurationFlags( Qgis::FieldConfigurationFlags flags );
 
    QString displayString( const QVariant &v ) const;
 
    static QString readableConfigurationFlag( Qgis::FieldConfigurationFlag flag );
 
#ifndef SIP_RUN
 
    bool convertCompatible( QVariant &v, QString *errorMessage = nullptr ) const;
#else
 
    bool convertCompatible( QVariant &v ) const;
    % MethodCode
    PyObject *sipParseErr = NULL;
 
    {
      QVariant *a0;
      int a0State = 0;
      const QgsField *sipCpp;
 
      if ( sipParseArgs( &sipParseErr, sipArgs, "BJ1", &sipSelf, sipType_QgsField, &sipCpp, sipType_QVariant, &a0, &a0State ) )
      {
        bool sipRes;
        QString errorMessage;
 
        Py_BEGIN_ALLOW_THREADS
        try
        {
          sipRes = sipCpp->convertCompatible( *a0, &errorMessage );
        }
        catch ( ... )
        {
          Py_BLOCK_THREADS
 
          sipReleaseType( a0, sipType_QVariant, a0State );
          sipRaiseUnknownException();
          return NULL;
        }
 
        Py_END_ALLOW_THREADS
 
        if ( !sipRes )
        {
          PyErr_SetString( PyExc_ValueError,
                           QString( "Value could not be converted to field type %1: %2" ).arg( QMetaType::typeName( sipCpp->type() ), errorMessage ).toUtf8().constData() );
          sipIsErr = 1;
        }
        else
        {
          PyObject *res = sipConvertFromType( a0, sipType_QVariant, NULL );
          sipReleaseType( a0, sipType_QVariant, a0State );
          return res;
        }
      }
      else
      {
        // Raise an exception if the arguments couldn't be parsed.
        sipNoMethod( sipParseErr, sipName_QgsField, sipName_convertCompatible, doc_QgsField_convertCompatible );
 
        return nullptr;
      }
    }
 
    % End
#endif
 
    operator QVariant() const
    {
      return QVariant::fromValue( *this );
    }
 
    void setEditorWidgetSetup( const QgsEditorWidgetSetup &v );
 
    QgsEditorWidgetSetup editorWidgetSetup() const;
 
    void setReadOnly( bool readOnly );
 
    bool isReadOnly() const;
 
    Qgis::FieldDomainSplitPolicy splitPolicy() const;
 
    void setSplitPolicy( Qgis::FieldDomainSplitPolicy policy );
 
#ifdef SIP_RUN
    SIP_PYOBJECT __repr__();
    % MethodCode
    QString str = QStringLiteral( "<QgsField: %1 (%2)>" ).arg( sipCpp->name() ).arg( sipCpp->typeName() );
    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
    % End
#endif
 
#ifndef SIP_RUN
    static constexpr int MAX_WKT_LENGTH = 999;
#endif
 
  private:
 
    QSharedDataPointer<QgsFieldPrivate> d;
 
 
}; // class QgsField
 
Q_DECLARE_METATYPE( QgsField )
 
 
CORE_EXPORT QDataStream &operator<<( QDataStream &out, const QgsField &field );
CORE_EXPORT QDataStream &operator>>( QDataStream &in, QgsField &field );
 
 
#endif