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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_GenericPredicate_H
#define Patternist_GenericPredicate_H
#include "qpaircontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short A predicate that can handle all kinds of predicates and
* is therefore not very efficient, but can cope with all the tricky scenarios.
*
* @see FirstItemPredicate
* @see TruthPredicate
* @author Frans Englich <fenglich@trolltech.com>
* @ingroup Patternist_expressions
*/
class GenericPredicate : public PairContainer
{
public:
/**
* Creates a predicate expression that filters the items gained
* from evaluating @p sourceExpression through the filter @p predicateExpression.
*
* This function performs type analyzis on the passed expressions, and may
* return more specialized expressions depending on the analyzis.
*
* If @p predicateExpression is an invalid predicate, an error is issued
* via the @p context.
*/
static Expression::Ptr create(const Expression::Ptr &sourceExpression,
const Expression::Ptr &predicateExpression,
const StaticContext::Ptr &context,
const QSourceLocation &location);
static Expression::Ptr createFirstItem(const Expression::Ptr &sourceExpression);
/**
* Creates a source iterator which is passed to the ItemMappingIterator
* and the Focus. The ItemMappingIterator modifies it with
* its QAbstractXmlForwardIterator::next() calls, and since the Focus references the same QAbstractXmlForwardIterator,
* the focus is automatically moved.
*/
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
/**
* Doesn't return the first item from calling evaluateSequence(), but does the mapping
* manually. This avoid allocating an ItemMappingIterator.
*/
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
inline Item mapToItem(const Item &subject,
const DynamicContext::Ptr &) const;
virtual SequenceType::List expectedOperandTypes() const;
virtual SequenceType::Ptr staticType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
virtual ID id() const;
/**
* @returns always CreatesFocusForLast.
*/
virtual Properties properties() const;
virtual QString description() const;
protected:
/**
* Creates a GenericPredicate which filters the items from the @p sourceExpression
* through @p predicate.
*
* This constructor is protected. The proper way to create predicates is via the static
* create() function.
*/
GenericPredicate(const Expression::Ptr &sourceExpression,
const Expression::Ptr &predicate);
/**
* @returns the ItemType of the first operand's staticType().
*/
virtual ItemType::Ptr newFocusType() const;
private:
typedef QExplicitlySharedDataPointer<const GenericPredicate> ConstPtr;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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