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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcommonsequencetypes_p.h"
#include "qexpressionsequence_p.h"
#include "qsorttuple_p.h"
#include "qreturnorderby_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
ReturnOrderBy::ReturnOrderBy(const OrderBy::Stability aStability,
const OrderBy::OrderSpec::Vector &oSpecs,
const Expression::List &ops) : UnlimitedContainer(ops)
, m_stability(aStability)
, m_orderSpecs(oSpecs)
, m_flyAway(true)
{
Q_ASSERT_X(m_operands.size() >= 2, Q_FUNC_INFO,
"ReturnOrderBy must have the return expression, and at least one sort key.");
Q_ASSERT(m_orderSpecs.size() == ops.size() - 1);
}
Item ReturnOrderBy::evaluateSingleton(const DynamicContext::Ptr &context) const
{
Q_ASSERT(m_operands.size() > 1);
const Item::Iterator::Ptr value(makeListIterator(m_operands.first()->evaluateSequence(context)->toList()));
Item::Vector sortKeys;
/* We're skipping the first operand. */
const int len = m_operands.size() - 1;
sortKeys.resize(len);
for(int i = 1; i <= len; ++i)
sortKeys[i - 1] = m_operands.at(i)->evaluateSingleton(context);
return Item(new SortTuple(value, sortKeys));
}
bool ReturnOrderBy::evaluateEBV(const DynamicContext::Ptr &context) const
{
// TODO This is temporary code.
return m_operands.first()->evaluateEBV(context);
}
Expression::Ptr ReturnOrderBy::compress(const StaticContext::Ptr &context)
{
/* We first did this in typeCheck(), but that broke due to that type checks were
* missed, which other pieces relied on. */
if(m_flyAway)
{
/* We only want the return expression, not the sort keys. */
return m_operands.first()->compress(context);
}
else
{
/* We don't need the members, so don't keep a reference to them. */
m_orderSpecs.clear();
return UnlimitedContainer::compress(context);
}
}
Expression::Properties ReturnOrderBy::properties() const
{
/* For some unknown reason this is necessary for XQTS test case orderBy18. */
return DisableElimination;
}
ExpressionVisitorResult::Ptr ReturnOrderBy::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
SequenceType::Ptr ReturnOrderBy::staticType() const
{
return m_operands.first()->staticType();
}
SequenceType::List ReturnOrderBy::expectedOperandTypes() const
{
SequenceType::List result;
result.append(CommonSequenceTypes::ZeroOrMoreItems);
result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
return result;
}
Expression::ID ReturnOrderBy::id() const
{
return IDReturnOrderBy;
}
QT_END_NAMESPACE
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