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qgsfieldvalidator.cpp
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qgsfieldvalidator.cpp
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/***************************************************************************
qgsfieldvalidator.cpp - description
-------------------
begin : March 2011
copyright : (C) 2011 by SunilRajKiran-kCube
email : sunilraj.kiran@kcubeconsulting.com
adapted version of QValidator for QgsField
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "qgsfieldvalidator.h"
#include <QValidator>
#include <QRegExpValidator>
#include <QDate>
#include <QVariant>
#include <QSettings>
#include "qgslogger.h"
#include "qgslonglongvalidator.h"
#include "qgsfield.h"
QgsFieldValidator::QgsFieldValidator( QObject *parent, const QgsField &field, QString defaultValue, QString dateFormat )
: QValidator( parent )
, mField( field )
, mDefaultValue( defaultValue )
, mDateFormat( dateFormat )
{
switch ( mField.type() )
{
case QVariant::Int:
{
if ( mField.length() > 0 )
{
QString re = QString( "-?\\d{0,%1}" ).arg( mField.length() );
mValidator = new QRegExpValidator( QRegExp( re ), parent );
}
else
{
mValidator = new QIntValidator( parent );
}
}
break;
case QVariant::Double:
{
if ( mField.length() > 0 && mField.precision() > 0 )
{
QString re = QString( "-?\\d{0,%1}(\\.\\d{0,%2})?" ).arg( mField.length() - mField.precision() ).arg( mField.precision() );
mValidator = new QRegExpValidator( QRegExp( re ), parent );
}
else if ( mField.length() > 0 && mField.precision() == 0 )
{
QString re = QString( "-?\\d{0,%1}" ).arg( mField.length() );
mValidator = new QRegExpValidator( QRegExp( re ), parent );
}
else if ( mField.precision() > 0 )
{
QString re = QString( "-?\\d*(\\.\\d{0,%1})?" ).arg( mField.precision() );
mValidator = new QRegExpValidator( QRegExp( re ), parent );
}
else
{
mValidator = new QDoubleValidator( parent );
}
}
break;
case QVariant::LongLong :
mValidator = new QgsLongLongValidator( parent );
break;
default:
mValidator = 0;
}
QSettings settings;
mNullValue = settings.value( "qgis/nullValue", "NULL" ).toString();
}
QgsFieldValidator::~QgsFieldValidator()
{
delete mValidator;
}
QValidator::State QgsFieldValidator::validate( QString &s, int &i ) const
{
// empty values are considered NULL for numbers and dates and are acceptable
if ( s.isEmpty() &&
( mField.type() == QVariant::Double
|| mField.type() == QVariant::Int
|| mField.type() == QVariant::LongLong
|| mField.type() == QVariant::Date
)
)
{
return Acceptable;
}
if ( s == mDefaultValue )
return Acceptable;
// delegate to the child validator if any
if ( mValidator )
{
QValidator::State result = mValidator->validate( s, i );
return result;
}
else if ( mField.type() == QVariant::String )
{
// allow to enter the NULL representation, which might be
// longer than the actual field
if ( mNullValue.size() > 0 && s.size() > 0 && s.size() < mNullValue.size() && s == mNullValue.left( s.size() ) )
return Intermediate;
if ( mDefaultValue.size() > 0 && s.size() > 0 && s.size() < mDefaultValue.size() && s == mDefaultValue.left( s.size() ) )
return Intermediate;
if ( s == mNullValue )
return Acceptable;
if ( mField.length() > 0 && s.size() > mField.length() )
return Invalid;
}
else if ( mField.type() == QVariant::Date )
{
return QDate::fromString( s, mDateFormat ).isValid() ? Acceptable : Intermediate;
}
else
{
QgsDebugMsg( QString( "unsupported type %1 for validation" ).arg( mField.type() ) );
return Invalid;
}
return Acceptable;
}
void QgsFieldValidator::fixup( QString &s ) const
{
if ( mValidator )
{
mValidator->fixup( s );
}
else if ( mField.type() == QVariant::String && mField.length() > 0 && s.size() > mField.length() && s != mDefaultValue )
{
// if the value is longer, this must be a partial NULL representation
s = mNullValue;
}
else if ( mField.type() == QVariant::Date )
{
// invalid dates will also translate to NULL
s = "";
}
}