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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
//
// 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 <private/qexpression_p.h>
#include <private/qfunctionsignature_p.h>
#include <private/qprimitives_p.h>
#include <QXmlName>
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 <frans.englich@nokia.com>
*/
class Q_AUTOTEST_EXPORT 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
#endif
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