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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_FunctionFactory_H
#define Patternist_FunctionFactory_H
#include <QHash>
#include <QSharedData>
#include "qexpression_p.h"
#include "qfunctionsignature_p.h"
#include "qprimitives_p.h"
#include "qxmlname.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short An entry point for looking up and creating FunctionCall instances.
*
* @ingroup Patternist_functions
* @see <a href ="http://www.w3.org/TR/xpath-functions/">XQuery 1.0
* and XPath 2.0 Functions and Operators</a>
* @see <a href="http://www.w3.org/TR/xpath20/#dt-function-signature">XML Path
* Language (XPath) 2.0, Definition: Function signatures</a>
* @author Frans Englich <fenglich@trolltech.com>
*/
class FunctionFactory : public QSharedData
{
public:
typedef QExplicitlySharedDataPointer<FunctionFactory> Ptr;
typedef QList<FunctionFactory::Ptr> List;
virtual ~FunctionFactory();
/**
* Creates a function call implementation.
*
* A FunctionFactory represents a set of functions, which it
* is able to instantiate and to serve FunctionSignatures for. Conventionally,
* a FunctionFactory per namespace exists.
*
* @note This function should not issue any error unless it is absolutely
* confident that the error cannot be fixed in another way. For example, in
* some cases it might be that a function is available in another FunctionFactory
* and it would therefore be wrong to issue an error signalling that no function
* by that @p name exists, but leave that to the callee.
* @param name the name of the function to create. In Clark syntax, this could
* for example be {http://www.w3.org/2005/04/xpath-functions}lower-case
* @param arguments the function's operands
* @param context the usual StaticContext which supplies compile time data
* and reporting functionality.
* @param r the SourceLocationReflection that identifies the callsite.
* @returns an instance of Expression which is the function implementation
* for @p name. Or, a static error was raised.
*/
virtual Expression::Ptr createFunctionCall(const QXmlName name,
const Expression::List &arguments,
const StaticContext::Ptr &context,
const SourceLocationReflection *const r) = 0;
/**
* Determines whether a function with the name @p name and arity @p arity
* is available. The implementation operates on the result of
* retrieveFunctionSignature() to determine the result.
*
* @param np the NamePool.
* @param name the name of the function. For example fn:string-join.
* @param arity the number of arguments the function must have.
*/
virtual bool isAvailable(const NamePool::Ptr &np,
const QXmlName name,
const xsInteger arity);
virtual FunctionSignature::Hash functionSignatures() const = 0;
/**
* Determines whether this FunctionFactory contains the function signature
* @p signature.
*
* The implementation uses functionSignatures().
*/
bool hasSignature(const FunctionSignature::Ptr &signature) const;
protected:
/**
* @short This constructor cannot be removed, because it can't be synthesized, for
* some reason.
*/
inline FunctionFactory()
{
}
/**
* This is a convenience function for sub-classes. It retrieves the
* function signature for function with name @p name.
*
* According to the specifications are function signatures identified by their
* name and arity, but currently is the arity not part of the signature.
*
* If no function could be found for the given name, @c null is returned.
*/
virtual FunctionSignature::Ptr retrieveFunctionSignature(const NamePool::Ptr &np, const QXmlName name) = 0;
private:
Q_DISABLE_COPY(FunctionFactory)
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
