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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_CardinalityVerifier_H
#define Patternist_CardinalityVerifier_H
#include "qsinglecontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Verifies that the sequence an Expression evaluates to conforms to a Cardinality.
*
* @see <a href="http://www.w3.org/TR/xpath-functions/#cardinality-funcs">XQuery 1.0 and
* XPath 2.0 Functions and Operators, 15.2 Functions That Test the Cardinality of Sequences</a>
* @author Frans Englich <fenglich@trolltech.com>
* @ingroup Patternist_expressions
*/
class CardinalityVerifier : public SingleContainer
{
public:
CardinalityVerifier(const Expression::Ptr &operand,
const Cardinality &card,
const ReportContext::ErrorCode code);
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
virtual SequenceType::List expectedOperandTypes() const;
virtual SequenceType::Ptr staticType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
/**
* If the static cardinality of the operand is within the required cardinality,
* the operand is returned as is, since results will always be valid and hence
* is not a CardinalityVerifier necessary.
*/
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
/**
* A utility function for determining whether the static type of an Expression matches
* a cardinality. More specifically, this function performs the cardinality verification
* part of the Function Conversion Rules.
*
* @todo Mention the rewrite and when exactly an error is issued via @p context
*/
static Expression::Ptr
verifyCardinality(const Expression::Ptr &operand,
const Cardinality &card,
const StaticContext::Ptr &context,
const ReportContext::ErrorCode code = ReportContext::XPTY0004);
virtual const SourceLocationReflection *actualReflection() const;
ID id() const;
private:
/**
* Centralizes a message string in order to increase consistency and
* reduce work for translators.
*/
static inline QString wrongCardinality(const Cardinality &req,
const Cardinality &got = Cardinality::empty());
const Cardinality m_reqCard;
const bool m_allowsMany;
const ReportContext::ErrorCode m_errorCode;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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