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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 1.1, 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 have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_AggregateFNs_H
#define Patternist_AggregateFNs_H
#include "qaggregator_p.h"
#include "qatomiccomparator_p.h"
#include "qatomicmathematician_p.h"
#include "qcomparisonplatform_p.h"
/**
* @file
* @short Contains classes implementing the functions found in
* <a href="http://www.w3.org/TR/xpath-functions/#aggregate-functions">XQuery 1.0 and
* XPath 2.0 Functions and Operators, 15.4 Aggregate Functions</a>.
*
* @todo document that some functions have both eval funcs implented.
*
* @ingroup Patternist_functions
*/
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements the function <tt>fn:count()</tt>.
*
* @ingroup Patternist_functions
* @author Frans Englich <frans.englich@nokia.com>
*/
class CountFN : public FunctionCall
{
public:
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
/**
* If @p reqType is CommonSequenceTypes::EBV, this function call is rewritten
* into a call to <tt>fn:exists()</tt>. Hence, <tt>if(count(X)) then ...</tt> is
* rewritten into <tt>if(exists(X)) then ...</tt>.
*/
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
/**
* If CountFN's operand has a Cardinality that is exact, as per Cardinality::isExact(),
* it is rewritten to the Cardinality's count.
*/
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
};
/**
* @short Base class for the implementations of the <tt>fn:avg()</tt> and <tt>fn:sum()</tt> function.
*
* @ingroup Patternist_functions
* @author Frans Englich <frans.englich@nokia.com>
*/
class AddingAggregate : public FunctionCall
{
public:
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
protected:
AtomicMathematician::Ptr m_mather;
};
/**
* @short Implements the function <tt>fn:avg()</tt>.
*
* @ingroup Patternist_functions
* @author Frans Englich <frans.englich@nokia.com>
*/
class AvgFN : public AddingAggregate
{
public:
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
virtual SequenceType::Ptr staticType() const;
private:
AtomicMathematician::Ptr m_adder;
AtomicMathematician::Ptr m_divider;
};
/**
* @short Implements the function <tt>fn:sum()</tt>.
*
* @ingroup Patternist_functions
* @author Frans Englich <frans.englich@nokia.com>
*/
class SumFN : public AddingAggregate
{
public:
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
virtual SequenceType::Ptr staticType() const;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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