/****************************************************************************+
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**+
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** Copyright (C) 2009 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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**+
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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 "qbuiltintypes_p.h"+
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#include "qcommonsequencetypes_p.h"+
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#include "qgenericsequencetype_p.h"+
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+
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#include "qcontextitem_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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Item ContextItem::evaluateSingleton(const DynamicContext::Ptr &context) const+
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{+
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    return context->contextItem();+
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}+
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+
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Expression::Ptr ContextItem::compress(const StaticContext::Ptr &context)+
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{+
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    m_itemType = context->contextItemType();+
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    return EmptyContainer::compress(context);+
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}+
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+
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Expression::Ptr ContextItem::typeCheck(const StaticContext::Ptr &context,+
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                                       const SequenceType::Ptr &reqType)+
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{+
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    m_itemType = context->contextItemType();+
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    return EmptyContainer::typeCheck(context, reqType);+
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}+
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+
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SequenceType::Ptr ContextItem::staticType() const+
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{+
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    /* We test m_itemType here because Patternist View calls staticType() before the typeCheck()+
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     * stage. */+
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    if(m_itemType)+
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        return makeGenericSequenceType(m_itemType, Cardinality::exactlyOne());+
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    else+
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        return CommonSequenceTypes::ExactlyOneItem;+
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}+
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+
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Expression::Properties ContextItem::properties() const+
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{+
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    return DisableElimination | RequiresContextItem | EvaluationCacheRedundant;+
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}+
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+
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ExpressionVisitorResult::Ptr ContextItem::accept(const ExpressionVisitor::Ptr &visitor) const+
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{+
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    return visitor->visit(this);+
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}+
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+
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Expression::ID ContextItem::id() const+
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{+
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    return IDContextItem;+
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}+
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+
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ItemType::Ptr ContextItem::expectedContextItemType() const+
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{+
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    return BuiltinTypes::item;+
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}+
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+
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const SourceLocationReflection *ContextItem::actualReflection() const+
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{+
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    if(m_expr)+
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        return m_expr.data();+
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    else+
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        return this;+
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}+
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+
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void ContextItem::announceFocusType(const ItemType::Ptr &type)+
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{+
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    Q_ASSERT(type);+
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    m_itemType = type;+
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}+
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+
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QT_END_NAMESPACE+
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