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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_CastableAs_H
#define Patternist_CastableAs_H
#include <private/qsinglecontainer_p.h>
#include <private/qcastingplatform_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements XPath 2.0's <tt>castable as</tt> expression.
*
* @see <a href="http://www.w3.org/TR/xpath20/#id-castable">XML Path Language
* (XPath) 2.0, 3.10.3 Castable</a>
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class CastableAs : public SingleContainer,
public CastingPlatform<CastableAs, false>
{
public:
CastableAs(const Expression::Ptr &operand,
const SequenceType::Ptr &targetType);
virtual bool evaluateEBV(const DynamicContext::Ptr &) const;
/**
* Overridden to const fold to @c true when the target type
* is a type which casting to always succeeds. This is
* the type identical to the target type, <tt>xs:string</tt>,
* and <tt>xs:untypedAtomic</tt>.
*/
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
virtual SequenceType::List expectedOperandTypes() const;
virtual SequenceType::Ptr staticType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
inline ItemType::Ptr targetType() const
{
return m_targetType->itemType();
}
private:
const SequenceType::Ptr m_targetType;
};
}
QT_END_NAMESPACE
#endif
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