/****************************************************************************+
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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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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "qarithmeticexpression_p.h"+
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#include "qcommonvalues_p.h"+
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#include "qliteral_p.h"+
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#include "qschemanumeric_p.h"+
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+
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#include "qunaryexpression_p.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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using namespace QPatternist;+
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+
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UnaryExpression::UnaryExpression(const AtomicMathematician::Operator op,+
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                                 const Expression::Ptr &operand,+
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                                 const StaticContext::Ptr &context) : ArithmeticExpression(wrapLiteral(CommonValues::IntegerZero, context, operand.data()),+
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                                                                                           op,+
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                                                                                           operand)+
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{+
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    Q_ASSERT(op == AtomicMathematician::Substract ||+
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             op == AtomicMathematician::Add);+
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    Q_ASSERT(context);+
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}+
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+
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Item UnaryExpression::evaluateSingleton(const DynamicContext::Ptr &context) const+
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{+
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    if(operatorID() == AtomicMathematician::Substract)+
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    {+
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        const Item item(m_operand2->evaluateSingleton(context));+
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+
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        if(item)+
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            return item.as<Numeric>()->toNegated();+
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        else+
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            return Item();+
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    }+
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    else+
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        return m_operand2->evaluateSingleton(context);+
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}+
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+
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QT_END_NAMESPACE+
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