/****************************************************************************+
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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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**+
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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 "qitemmappingiterator_p.h"+
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+
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#include "qcopyof_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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CopyOf::CopyOf(const Expression::Ptr &operand,+
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               const bool inheritNSS,+
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               const bool preserveNSS) : SingleContainer(operand)+
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                                       , m_inheritNamespaces(inheritNSS)+
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                                       , m_preserveNamespaces(preserveNSS)+
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                                       , m_settings((m_inheritNamespaces ? QAbstractXmlNodeModel::InheritNamespaces : QAbstractXmlNodeModel::NodeCopySettings()) |+
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                                                    (m_preserveNamespaces ? QAbstractXmlNodeModel::PreserveNamespaces : QAbstractXmlNodeModel::NodeCopySettings()))+
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{+
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}+
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+
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Expression::Ptr CopyOf::compress(const StaticContext::Ptr &context)+
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{+
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    /* We have zero effect if we have these settings. */+
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    if(m_inheritNamespaces && m_preserveNamespaces)+
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        return m_operand->compress(context);+
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    else+
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    {+
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        const ItemType::Ptr t(m_operand->staticType()->itemType());+
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        /* We have no effect on the empty sequence or atomic values. */+
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        if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t)+
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          || *t == *CommonSequenceTypes::Empty)+
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            return m_operand->compress(context);+
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        else+
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            return SingleContainer::compress(context);+
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    }+
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}+
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+
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void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const+
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{+
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    /* Optimization: this completely breaks streaming. We get a call to+
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     * evaluateToSequenceReceiver() but we require heap allocations by calling+
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     * evaluateSequence(). */+
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+
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    const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));+
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    QAbstractXmlReceiver *const receiver = context->outputReceiver();+
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    Item next(it->next());+
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+
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    while(next)+
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    {+
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        if(next.isNode())+
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        {+
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            const QXmlNodeModelIndex &asNode = next.asNode();+
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            asNode.model()->copyNodeTo(asNode, receiver, m_settings);+
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        }+
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        else+
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            receiver->item(next);+
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+
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        next = it->next();+
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    }+
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}+
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+
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ExpressionVisitorResult::Ptr CopyOf::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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SequenceType::Ptr CopyOf::staticType() const+
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{+
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    return m_operand->staticType();+
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}+
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+
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SequenceType::List CopyOf::expectedOperandTypes() const+
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{+
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    SequenceType::List result;+
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    result.append(CommonSequenceTypes::ZeroOrMoreItems);+
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    return result;+
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}+
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+
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Expression::Properties CopyOf::properties() const+
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{+
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    /* We have the content of node constructors as children, but even though+
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     * createCopyOf() typically avoids creating us, we can still end up with an operand+
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     * that allows compression. We must always avoid that, because we don't have+
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     * implementation of evaluateSequence(), and so on. */+
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    return (m_operand->properties() & ~CreatesFocusForLast) | DisableElimination;+
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}+
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+
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ItemType::Ptr CopyOf::expectedContextItemType() const+
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{+
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    return m_operand->expectedContextItemType();+
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}+
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+
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QT_END_NAMESPACE+
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