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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_UnlimitedContainer_H
#define Patternist_UnlimitedContainer_H
#include <QList>
#include "qexpression_p.h"
#include "qgenericsequencetype_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Base class for expressions that has any amount of operands.
*
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class UnlimitedContainer : public Expression
{
public:
/**
* Creates an UnlimitedContainer containing the operands @p operands. @p operands
* may be empty.
*/
UnlimitedContainer(const Expression::List &operands = Expression::List());
virtual void setOperands(const Expression::List &list);
virtual Expression::List operands() const;
/**
* @note This function cannot be called before setOperands is called.
*/
virtual bool compressOperands(const StaticContext::Ptr &);
/**
* Tells how operandsUnionType() should compute the cardinality of
* its children.
*
* This type is public because of a bug in the HP-UX aCC compiler.
*/
enum CardinalityComputation
{
ProductOfCardinality,
UnionOfCardinality
};
protected:
/**
* Computes and returns the union type of all the Expression instances
* in this Expression's operands.
*
* This implementation is placed inside because CardinalityComputation
* can't be referenced from the outside(in conforming compilers).
*/
template<CardinalityComputation suppliedCard>
inline
SequenceType::Ptr operandsUnionType() const
{
Q_ASSERT(suppliedCard == ProductOfCardinality || suppliedCard == UnionOfCardinality);
const Expression::List::const_iterator end(m_operands.constEnd());
Expression::List::const_iterator it(m_operands.constBegin());
/* Load the first one, and jump over it in the loop. */
SequenceType::Ptr t(m_operands.first()->staticType());
ItemType::Ptr type(t->itemType());
Cardinality card(t->cardinality());
++it;
for(; it != end; ++it)
{
t = (*it)->staticType();
type |= t->itemType();
/* Since this function is a template function, it doesn't
* hurt performance that this test is inside the loop. */
if(suppliedCard == ProductOfCardinality)
card += t->cardinality();
else
card |= t->cardinality();
}
return makeGenericSequenceType(type, card);
}
Expression::List m_operands;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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