//
// URIStreamFactory.h
//
// Library: Foundation
// Package: URI
// Module:  URIStreamFactory
//
// Definition of the URIStreamFactory class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_URIStreamFactory_INCLUDED
#define Foundation_URIStreamFactory_INCLUDED


#include <istream>
#include "Poco/Foundation.h"


namespace Poco
{


class URI;


class Foundation_API URIStreamFactory
/// This class defines the interface that all
/// URI stream factories must implement.
///
/// Subclasses must implement the open() method.
{
public:
    URIStreamFactory();
    /// Creates the URIStreamFactory.

    virtual std::istream * open(const URI & uri) = 0;
    /// Tries to create and open an input stream for the
    /// resource specified by the given URI.
    ///
    /// If the stream cannot be opened for whatever reason,
    /// an appropriate IOException must be thrown.
    ///
    /// If opening the stream results in a redirect, a
    /// URIRedirection exception should be thrown.

protected:
    virtual ~URIStreamFactory();
    /// Destroys the URIStreamFactory.

private:
    URIStreamFactory(const URIStreamFactory &);
    URIStreamFactory & operator=(const URIStreamFactory &);

    friend class URIStreamOpener;
};


class Foundation_API URIRedirection
/// An instance of URIRedirection is thrown by a URIStreamFactory::open()
/// if opening the original URI resulted in a redirection response
/// (such as a MOVED PERMANENTLY in HTTP).
{
public:
    URIRedirection(const std::string & uri);
    URIRedirection(const URIRedirection & redir);

    URIRedirection & operator=(const URIRedirection & redir);
    void swap(URIRedirection & redir);

    const std::string & uri() const;
    /// Returns the new URI.

private:
    URIRedirection();

    std::string _uri;
};


//
// inlines
//
inline const std::string & URIRedirection::uri() const
{
    return _uri;
}


} // namespace Poco


#endif // Foundation_URIStreamFactory_INCLUDED