/****************************************************************************

**

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtXmlPatterns module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** 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.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

/**

 * @file

 * @short This file is included by qcomparisonplatform_p.h.

 * If you need includes in this file, put them in qcomparisonplatform_p.h, outside of the namespace.

 */

template <typename TSubClass, bool issueError,

          AtomicComparator::ComparisonType comparisonType, ReportContext::ErrorCode errorCode>

bool ComparisonPlatform<TSubClass, issueError, comparisonType, errorCode>::

flexibleCompare(const Item &it1,

                const Item &it2,

                const DynamicContext::Ptr &context) const

{

    if(m_comparator)

        /* The comparator was located at compile time. */

        return compare(it1, it2, m_comparator, operatorID());

    else

    {

        const AtomicComparator::Ptr cp(fetchComparator(it1.type(),

                                                       it2.type(),

                                                       context));

        return cp ? compare(it1, it2, cp, operatorID()) : false;

    }

}

template <typename TSubClass, bool issueError,

          AtomicComparator::ComparisonType comparisonType, ReportContext::ErrorCode errorCode>

AtomicComparator::ComparisonResult

ComparisonPlatform<TSubClass, issueError, comparisonType, errorCode>::

detailedFlexibleCompare(const Item &it1,

                        const Item &it2,

                        const DynamicContext::Ptr &context) const

{

    AtomicComparator::Ptr comp;

    if(m_comparator)

        comp = m_comparator;

    else

    {

        comp = fetchComparator(it1.type(),

                               it2.type(),

                               context);

    }

    Q_ASSERT_X(operatorID() == AtomicComparator::OperatorLessThanNaNLeast || operatorID() == AtomicComparator::OperatorLessThanNaNGreatest,

               Q_FUNC_INFO, "Only OperatorLessThan is currently supported for this function.");

    return comp->compare(it1, operatorID(), it2);

}

template <typename TSubClass, bool issueError,

          AtomicComparator::ComparisonType comparisonType, ReportContext::ErrorCode errorCode>

bool ComparisonPlatform<TSubClass, issueError, comparisonType, errorCode>::

compare(const Item &oand1,

        const Item &oand2,

        const AtomicComparator::Ptr &comp,

        const AtomicComparator::Operator op) const

{

    Q_ASSERT(oand1);

    Q_ASSERT(oand2);

    Q_ASSERT(comp);

    switch(op)

    {

        case AtomicComparator::OperatorEqual:

            return comp->equals(oand1, oand2);

        case AtomicComparator::OperatorNotEqual:

            return !comp->equals(oand1, oand2);

        case AtomicComparator::OperatorLessThanNaNLeast:

        case AtomicComparator::OperatorLessThanNaNGreatest:

        /* Fallthrough. */

        case AtomicComparator::OperatorLessThan:

            return comp->compare(oand1, op, oand2) == AtomicComparator::LessThan;

        case AtomicComparator::OperatorGreaterThan:

            return comp->compare(oand1, op, oand2) == AtomicComparator::GreaterThan;

        case AtomicComparator::OperatorLessOrEqual:

        {

            const AtomicComparator::ComparisonResult ret = comp->compare(oand1, op, oand2);

            return ret == AtomicComparator::LessThan || ret == AtomicComparator::Equal;

        }

        case(AtomicComparator::OperatorGreaterOrEqual):

        {

            const AtomicComparator::ComparisonResult ret = comp->compare(oand1, op, oand2);

            return ret == AtomicComparator::GreaterThan || ret == AtomicComparator::Equal;

        }

    }

    /* GCC unbarfer, this line should never be reached. */

    Q_ASSERT(false);

    return false;

}

template <typename TSubClass, bool issueError,

          AtomicComparator::ComparisonType comparisonType, ReportContext::ErrorCode errorCode>

AtomicComparator::Ptr ComparisonPlatform<TSubClass, issueError, comparisonType, errorCode>::

fetchComparator(const ItemType::Ptr &t1,

                const ItemType::Ptr &t2,

                const ReportContext::Ptr &context) const

{

    Q_ASSERT(t1);

    Q_ASSERT(t2);

    if(*BuiltinTypes::xsAnyAtomicType == *t1    ||

       *BuiltinTypes::xsAnyAtomicType == *t2    ||

       *BuiltinTypes::item == *t1               ||

       *BuiltinTypes::item == *t2               ||

       *BuiltinTypes::numeric == *t1            ||

       *BuiltinTypes::numeric == *t2            ||

       *CommonSequenceTypes::Empty == *t1       ||

       *CommonSequenceTypes::Empty == *t2)

    {

        /* The static type of(at least) one of the operands could not

         * be narrowed further, so we do the operator

         * lookup at runtime.

         */

        return AtomicComparator::Ptr();

    }

    const AtomicComparatorLocator::Ptr locator

        (static_cast<const AtomicType *>(t1.data())->comparatorLocator());

    if(!locator)

    {

        if(issueError)

        {

            context->error(QtXmlPatterns::tr("No comparisons can be done involving the type %1.")

                                            .arg(formatType(context->namePool(), t1)),

                                       errorCode, static_cast<const TSubClass *>(this)->actualReflection());

        }

        return AtomicComparator::Ptr();

    }

    const AtomicComparator::Ptr comp(static_cast<const AtomicType *>(t2.data())->accept(locator, operatorID(),

                                                                                       static_cast<const TSubClass *>(this)->actualReflection()));

    if(comp)

        return comp;

    else if(issueError)

    {

        context->error(QtXmlPatterns::tr("Operator %1 is not available between atomic values of type %2 and %3.")

                                        .arg(formatKeyword(AtomicComparator::displayName(operatorID(),

                                                                                         comparisonType)),

                                             formatType(context->namePool(), t1),

                                             formatType(context->namePool(), t2)),

                                   errorCode, static_cast<const TSubClass *>(this)->actualReflection());

    }

    return AtomicComparator::Ptr();

}

template <typename TSubClass, bool issueError,

          AtomicComparator::ComparisonType comparisonType, ReportContext::ErrorCode errorCode>

void ComparisonPlatform<TSubClass, issueError, comparisonType, errorCode>::

prepareComparison(const AtomicComparator::Ptr &c)

{

    m_comparator = c;

}