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/**
* UGENE - Integrated Bioinformatics Tools.
* Copyright (C) 2008-2011 UniPro <ugene@unipro.ru>
* http://ugene.unipro.ru
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#ifndef _U2_DBI_UTILS_H_
#define _U2_DBI_UTILS_H_
#include <U2Core/U2Dbi.h>
#include <U2Core/Task.h>
namespace U2 {
class U2OpStatus;
/**
Helper class that allocates connection in constructor and automatically releases it in the destructor
It uses app-global connection pool.
Note: DbiHandle caches U2OpStatus and reuses it in destructor on DBI release. Ensure that
U2OpStatus live range contains DbiHandle live range
*/
class U2CORE_EXPORT DbiHandle {
public:
/** Opens connection to existing DBI */
DbiHandle(U2DbiFactoryId id, const QString& url, U2OpStatus& os);
/** Opens connection to existing DBI or create news DBI*/
DbiHandle(U2DbiFactoryId id, const QString& url, bool create, U2OpStatus& os);
DbiHandle(const DbiHandle & dbiHandle_);
~DbiHandle();
U2Dbi* dbi;
U2OpStatus& os;
private: //TODO
DbiHandle & operator=(const DbiHandle & DbiHandle_);
};
/**
Iterator over buffered data set
*/
template<class T> class BufferedDbiIterator : public U2DbiIterator<T> {
public:
BufferedDbiIterator(const QList<T>& _buffer, const T& _errValue = T()) : buffer(_buffer), pos(0), errValue(_errValue) {}
/** returns true if there are more reads to iterate*/
virtual bool hasNext() {
return pos < buffer.size();
}
/** returns next read and shifts one element*/
virtual T next() {
if (!hasNext()) {
return errValue;
}
const T& res = buffer.at(pos);
pos++;
return res;
}
/** returns next read without shifting*/
virtual T peek() {
if (!hasNext()) {
return errValue;
}
return buffer.at(pos);
}
private:
QList<T> buffer;
int pos;
T errValue;
};
class U2CORE_EXPORT U2DbiUtils : public QObject{
Q_OBJECT
public:
/**
Logs that operation called is not supported by DBI
If U2OpStatus has no error set, sets the error message
*/
static void logNotSupported(U2DbiFeature f, U2Dbi* dbi, U2OpStatus& os);
template<class T> static QList<T> toList(U2DbiIterator<T>* it);
};
template<class T> QList<T> U2DbiUtils::toList(U2DbiIterator<T>* it) {
QList<T> result;
while (it->hasNext()) {
result << it->next();
}
return result;
}
}// namespace
#endif
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