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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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.
**
** 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_AtomicComparators_H
#define Patternist_AtomicComparators_H
#include "qabstractfloat_p.h"
#include "qatomiccomparator_p.h"
#include "qprimitives_p.h"
/**
* @file
* @short Contains all the classes implementing comparisons between atomic values.
*/
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Performs case @em sensitive string comparison
* between @c xs:anyUri, @c xs:string, and @c xs:untypedAtomic.
*
* @ingroup Patternist_xdm
* @author Frans Englich <frans.englich@nokia.com>
*/
class StringComparator : public AtomicComparator
{
public:
/**
* Compares two strings, and returns the appropriate AtomicComparator::ComparisonResult enum. This
* is a bit simplified version of string comparison as defined in the XPath specifications,
* since this does not take any string collations into account(which an implementation neither
* is required to do).
*
* @see <a href="http://www.w3.org/TR/xpath-functions/#string-compare">XQuery 1.0 and XPath
* 2.0 Functions and Operators, 7.3 ValueComparison::Equality and Comparison of Strings</a>
*/
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
/**
* Compares two strings, and returns @c true if they are considered equal as per
* an ordinary string comparison. In other words, this is an implementation with
* the Unicode code point collation.
*
* @see <a href="http://www.w3.org/TR/xpath-functions/#string-compare">XQuery 1.0 and XPath
* 2.0 Functions and Operators, 7.3 ValueComparison::Equality and Comparison of Strings</a>
*/
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Performs case @em insensitive string comparison
* between @c xs:anyUri, @c xs:string, and @c xs:untypedAtomic.
*
* @ingroup Patternist_xdm
* @author Frans Englich <frans.englich@nokia.com>
*/
class CaseInsensitiveStringComparator : public AtomicComparator
{
public:
/**
* Converts both string values to upper case and afterwards compare them.
*/
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
/**
* Converts both string values case insensitively.
*/
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares @c xs:base64Binary and @c xs:hexBinary values.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class BinaryDataComparator : public AtomicComparator
{
public:
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares @c xs:boolean values.
*
* This is done via the object's Boolean::evaluteEBV() function.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class BooleanComparator : public AtomicComparator
{
public:
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares @c xs:double values.
*
* @todo Add docs about numeric promotion
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class AbstractFloatComparator : public AtomicComparator
{
public:
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares @c xs:double values for the purpose of sorting.
*
* @todo Add docs about numeric promotion
*
* @author Frans Englich <frans.englich@nokia.com>
*/
template<const AtomicComparator::Operator t_op>
class AbstractFloatSortComparator : public AbstractFloatComparator
{
public:
virtual ComparisonResult compare(const Item &o1,
const AtomicComparator::Operator op,
const Item &o2) const
{
Q_ASSERT_X(t_op == OperatorLessThanNaNLeast || t_op == OperatorLessThanNaNGreatest, Q_FUNC_INFO,
"Can only be instantiated with those two.");
Q_ASSERT(op == t_op);
Q_UNUSED(op); /* Needed when building in release mode. */
const xsDouble v1 = o1.template as<Numeric>()->toDouble();
const xsDouble v2 = o2.template as<Numeric>()->toDouble();
if(qIsNaN(v1) && !qIsNaN(v2))
return t_op == OperatorLessThanNaNLeast ? LessThan : GreaterThan;
if(!qIsNaN(v1) && qIsNaN(v2))
return t_op == OperatorLessThanNaNLeast ? GreaterThan : LessThan;
if(Double::isEqual(v1, v2))
return Equal;
else if(v1 < v2)
return LessThan;
else
return GreaterThan;
}
};
/**
* @short Compares @c xs:decimal values.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class DecimalComparator : public AtomicComparator
{
public:
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares @c xs:integer values.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class IntegerComparator : public AtomicComparator
{
public:
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares @c xs:QName values.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class QNameComparator : public AtomicComparator
{
public:
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares sub-classes of AbstractDateTime.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class AbstractDateTimeComparator : public AtomicComparator
{
public:
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
virtual bool equals(const Item &op1,
const Item &op2) const;
};
/**
* @short Compares sub-classes of AbstractDuration.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class AbstractDurationComparator : public AtomicComparator
{
public:
virtual ComparisonResult compare(const Item &op1,
const AtomicComparator::Operator op,
const Item &op2) const;
virtual bool equals(const Item &op1,
const Item &op2) const;
private:
static inline QDateTime addDurationToDateTime(const QDateTime &dateTime,
const AbstractDuration *const duration);
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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