/****************************************************************************+
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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_AggregateFNs_H+
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#define Patternist_AggregateFNs_H+
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+
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#include "qaggregator_p.h"+
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#include "qatomiccomparator_p.h"+
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#include "qatomicmathematician_p.h"+
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#include "qcomparisonplatform_p.h"+
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+
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/**+
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 * @file+
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 * @short Contains classes implementing the functions found in+
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 * <a href="http://www.w3.org/TR/xpath-functions/#aggregate-functions">XQuery 1.0 and+
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 * XPath 2.0 Functions and Operators, 15.4 Aggregate Functions</a>.+
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 *+
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 * @todo document that some functions have both eval funcs implented.+
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 *+
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 * @ingroup Patternist_functions+
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 */+
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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 the function <tt>fn:count()</tt>.+
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     *+
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     * @ingroup Patternist_functions+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     */+
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    class CountFN : public FunctionCall+
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    {+
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    public:+
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        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;+
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+
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        /**+
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         * If @p reqType is CommonSequenceTypes::EBV, this function call is rewritten+
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         * into a call to <tt>fn:exists()</tt>. Hence, <tt>if(count(X)) then ...</tt> is+
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         * rewritten into <tt>if(exists(X)) then ...</tt>.+
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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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         * If CountFN's operand has a Cardinality that is exact, as per Cardinality::isExact(),+
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         * it is rewritten to the Cardinality's count.+
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         */+
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        virtual Expression::Ptr compress(const StaticContext::Ptr &context);+
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    };+
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+
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    /**+
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     * @short Base class for the implementations of the <tt>fn:avg()</tt> and <tt>fn:sum()</tt> function.+
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     *+
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     * @ingroup Patternist_functions+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     */+
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    class AddingAggregate : public FunctionCall+
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    {+
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    public:+
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        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,+
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                                          const SequenceType::Ptr &reqType);+
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    protected:+
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        AtomicMathematician::Ptr m_mather;+
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    };+
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+
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    /**+
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     * @short Implements the function <tt>fn:avg()</tt>.+
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     *+
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     * @ingroup Patternist_functions+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     */+
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    class AvgFN : public AddingAggregate+
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    {+
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    public:+
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        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;+
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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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        virtual SequenceType::Ptr staticType() const;+
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    private:+
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        AtomicMathematician::Ptr m_adder;+
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        AtomicMathematician::Ptr m_divider;+
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    };+
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+
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    /**+
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     * @short Implements the function <tt>fn:sum()</tt>.+
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     *+
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     * @ingroup Patternist_functions+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     */+
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    class SumFN : public AddingAggregate+
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    {+
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    public:+
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        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;+
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        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,+
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                                          const SequenceType::Ptr &reqType);+
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        virtual SequenceType::Ptr staticType() const;+
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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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