/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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//+
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//  W A R N I N G+
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//  -------------+
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//+
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// This file is not part of the Qt API.  It exists purely as an+
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// implementation detail.  This header file may change from version to+
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// version without notice, or even be removed.+
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//+
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// We mean it.+
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+
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#ifndef Patternist_TreatAs_H+
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#define Patternist_TreatAs_H+
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+
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#include "qsinglecontainer_p.h"+
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+
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QT_BEGIN_HEADER+
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+
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QT_BEGIN_NAMESPACE+
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+
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namespace QPatternist+
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{+
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    /**+
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     * @short Implements XPath 2.0's <tt>treat as</tt> expression.+
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     *+
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     * TreatAs is always a compile-time class only, and is always deallocated+
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     * by re-writing to CardinalityVerifier or ItemVerifier or both, by calling+
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     * TypeChecker::applyFunctionConversion().+
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     *+
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     *+
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     * One approach could be to skip instantiating TreatAs and simply let the+
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     * return value of TypeChecker::applyFunctionConversion() be inserted into+
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     * the AST, but that wouldn't handle type checking the context item+
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     * properly, which depends on that the StaticContext have been set by the+
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     * parent Expression.+
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     *+
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     * @see <a href="http://www.w3.org/TR/xpath20/#id-treat">XML Path Language+
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     * (XPath) 2.0, 3.10.5 Treat</a>+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     * @ingroup Patternist_expressions+
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     */+
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    class TreatAs : public SingleContainer+
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    {+
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    public:+
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        /**+
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         * Creats a TreatAs where it is checked that the expression @p operand conforms+
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         * to the type @p reqType.+
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         */+
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        TreatAs(const Expression::Ptr &operand,+
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                const SequenceType::Ptr &reqType);+
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+
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        /**+
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         * This function rewrites always. First the type that this TreatAs expression tests for+
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         * is verified. Then, the type the <tt>treat as</tt> expression itself must match, @p reqType,+
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         * is verified.+
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         */+
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        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,+
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                                          const SequenceType::Ptr &reqType);+
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+
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        /**+
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         * @returns always the SequenceType passed in the constructor to this class. That is, the+
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         * SequenceType that the operand must conform to.+
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         */+
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        virtual SequenceType::Ptr staticType() const;+
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+
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        /**+
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         * @returns a list containing one CommonSequenceTypes::ZeroOrMoreItems+
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         */+
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        virtual SequenceType::List expectedOperandTypes() const;+
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+
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        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;+
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+
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    private:+
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        const SequenceType::Ptr m_reqType;+
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    };+
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}+
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+
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QT_END_NAMESPACE+
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+
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QT_END_HEADER+
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+
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#endif+
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