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qgsvectordataprovider.cpp
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qgsvectordataprovider.cpp
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/***************************************************************************
qgsvectordataprovider.cpp - DataProvider Interface for vector layers
--------------------------------------
Date : 26-Oct-2004
Copyright : (C) 2004 by Marco Hugentobler
email : marco.hugentobler@autoform.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. *
* *
***************************************************************************/
/* $Id$ */
#include "qgsvectordataprovider.h"
#include "qgsfeature.h"
QgsVectorDataProvider::QgsVectorDataProvider(): mEditable(false), mModified(false)
{
}
bool QgsVectorDataProvider::startEditing()
{
//providers supporting editing need to overwrite this method
return false;
}
void QgsVectorDataProvider::stopEditing()
{
mEditable=false;
}
bool QgsVectorDataProvider::commitChanges()
{
if(mEditable)
{
bool returnvalue=true;
for(std::list<QgsFeature*>::iterator it=mAddedFeatures.begin();it!=mAddedFeatures.end();++it)
{
if(!commitFeature(*it))
{
returnvalue=false;
}
delete *it;
}
mAddedFeatures.clear();
mModified=false;
return returnvalue;
}
else
{
return false;
}
}
bool QgsVectorDataProvider::rollBack()
{
if(mEditable)
{
for(std::list<QgsFeature*>::iterator it=mAddedFeatures.begin();it!=mAddedFeatures.end();++it)
{
delete *it;
}
mAddedFeatures.clear();
mModified=false;
return true;
}
else
{
return false;
}
}
bool QgsVectorDataProvider::addFeature(QgsFeature* f)
{
if(mEditable)
{
mAddedFeatures.push_back(f);
mAddedFeaturesIt=mAddedFeatures.begin();
mModified=true;
return true;
}
else
{
return false;
}
}
bool QgsVectorDataProvider::deleteFeature(int id)
{
//not yet implemented
return false;
}
QString QgsVectorDataProvider::getDefaultValue(const QString& attr,
QgsFeature* f) {
return "";
}
bool QgsVectorDataProvider::commitFeature(QgsFeature* f)
{
//needs to be done by subclasses
return false;
}