/****************************************************************************+
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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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**+
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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_GenericPredicate_H+
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#define Patternist_GenericPredicate_H+
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+
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#include "qpaircontainer_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 A predicate that can handle all kinds of predicates and+
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     * is therefore not very efficient, but can cope with all the tricky scenarios.+
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     *+
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     * @see FirstItemPredicate+
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     * @see TruthPredicate+
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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 GenericPredicate : public PairContainer+
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    {+
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    public:+
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+
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        /**+
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         * Creates a predicate expression that filters the items gained+
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         * from evaluating @p sourceExpression through the filter @p predicateExpression.+
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         *+
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         * This function performs type analyzis on the passed expressions, and may+
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         * return more specialized expressions depending on the analyzis.+
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         *+
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         * If @p predicateExpression is an invalid predicate, an error is issued+
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         * via the @p context.+
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         */+
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        static Expression::Ptr create(const Expression::Ptr &sourceExpression,+
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                                      const Expression::Ptr &predicateExpression,+
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                                      const StaticContext::Ptr &context,+
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                                      const QSourceLocation &location);+
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+
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        static Expression::Ptr createFirstItem(const Expression::Ptr &sourceExpression);+
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+
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        /**+
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         * Creates a source iterator which is passed to the ItemMappingIterator+
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         * and the Focus. The ItemMappingIterator modifies it with+
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         * its QAbstractXmlForwardIterator::next() calls, and since the Focus references the same QAbstractXmlForwardIterator,+
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         * the focus is automatically moved.+
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         */+
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        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;+
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+
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        /**+
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         * Doesn't return the first item from calling evaluateSequence(), but does the mapping+
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         * manually. This avoid allocating an ItemMappingIterator.+
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         */+
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        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;+
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+
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        inline Item mapToItem(const Item &subject,+
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                                   const DynamicContext::Ptr &) const;+
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+
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        virtual SequenceType::List expectedOperandTypes() const;+
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        virtual SequenceType::Ptr staticType() const;+
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        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;+
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        virtual ID id() const;+
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+
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        /**+
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         * @returns always CreatesFocusForLast.+
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         */+
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        virtual Properties properties() const;+
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+
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        virtual QString description() const;+
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+
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    protected:+
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+
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        /**+
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         * Creates a GenericPredicate which filters the items from the @p sourceExpression+
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         * through @p predicate.+
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         *+
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         * This constructor is protected. The proper way to create predicates is via the static+
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         * create() function.+
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         */+
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        GenericPredicate(const Expression::Ptr &sourceExpression,+
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                         const Expression::Ptr &predicate);+
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+
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        /**+
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         * @returns the ItemType of the first operand's staticType().+
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         */+
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        virtual ItemType::Ptr newFocusType() const;+
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+
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    private:+
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        typedef QExplicitlySharedDataPointer<const GenericPredicate> ConstPtr;+
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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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