source: trunk/src/xmlpatterns/functions/qdatetimefns_p.h@ 966

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//
//  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_DateTimeFNs_H
#define Patternist_DateTimeFNs_H

#include "qatomiccomparator_p.h"
#include "qcommonvalues_p.h"
#include "qschemadatetime_p.h"
#include "qdaytimeduration_p.h"
#include "qdecimal_p.h"
#include "qinteger_p.h"
#include "qfunctioncall_p.h"

/**
 * @file
 * @short Contains classes implementing the functions found in
 * <a href="http://www.w3.org/TR/xpath-functions/#component-exraction-functions">XQuery 1.0 and
 * XPath 2.0 Functions and Operators, 10.5 Component Extraction Functions on Durations, Dates and Times</a>.
 *
 * @ingroup Patternist_functions
 */

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Helper class for implementing functions extracting components from durations.
     *
     * Each sub-class must implement this function:
     *
     * @code
     * Item extract(const AbstractDuration *const duration) const;
     * @endcode
     *
     * This function performs the actual component extraction from the argument, that
     * is guaranteed to never be @c null.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    template<typename TSubClass>
    class ExtractFromDurationFN : public FunctionCall
    {
    public:
        /**
         * Takes care of the argument handling, and, if applicable,
         * calls extract() with the value of the operand.
         */
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:years-from-duration()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class YearsFromDurationFN : public ExtractFromDurationFN<YearsFromDurationFN>
    {
    public:
        inline Item extract(const AbstractDuration *const duration) const;
    };

    /**
     * @short Implements the function <tt>fn:months-from-duration()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class MonthsFromDurationFN : public ExtractFromDurationFN<MonthsFromDurationFN>
    {
    public:
        inline Item extract(const AbstractDuration *const duration) const;
    };

    /**
     * @short Implements the function <tt>fn:days-from-duration()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class DaysFromDurationFN : public ExtractFromDurationFN<DaysFromDurationFN>
    {
    public:
        inline Item extract(const AbstractDuration *const duration) const;
    };

    /**