mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-12 09:22:05 +00:00
137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
//
|
|
// URIStreamOpener.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: URI
|
|
// Module: URIStreamOpener
|
|
//
|
|
// Definition of the URIStreamOpener class.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_URIStreamOpener_INCLUDED
|
|
#define Foundation_URIStreamOpener_INCLUDED
|
|
|
|
|
|
#include <istream>
|
|
#include <map>
|
|
#include "Poco/Foundation.h"
|
|
#include "Poco/Mutex.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
class URI;
|
|
class URIStreamFactory;
|
|
class Path;
|
|
|
|
|
|
class Foundation_API URIStreamOpener
|
|
/// The URIStreamOpener class is used to create and open input streams
|
|
/// for resourced identified by Uniform Resource Identifiers.
|
|
///
|
|
/// For every URI scheme used, a URIStreamFactory must be registered.
|
|
/// A FileStreamFactory is automatically registered for file URIs.
|
|
{
|
|
public:
|
|
enum
|
|
{
|
|
MAX_REDIRECTS = 10
|
|
};
|
|
|
|
URIStreamOpener();
|
|
/// Creates the URIStreamOpener and registers a FileStreamFactory
|
|
/// for file URIs.
|
|
|
|
~URIStreamOpener();
|
|
/// Destroys the URIStreamOpener and deletes all registered
|
|
/// URI stream factories.
|
|
|
|
std::istream * open(const URI & uri) const;
|
|
/// Tries to create and open an input stream for the resource specified
|
|
/// by the given uniform resource identifier.
|
|
///
|
|
/// If no URIStreamFactory has been registered for the URI's
|
|
/// scheme, a UnknownURIScheme exception is thrown.
|
|
/// If the stream cannot be opened for any reason, an
|
|
/// IOException is thrown.
|
|
///
|
|
/// The given URI must be a valid one. This excludes file system paths.
|
|
///
|
|
/// Whoever calls the method is responsible for deleting
|
|
/// the returned stream.
|
|
|
|
std::istream * open(const std::string & pathOrURI) const;
|
|
/// Tries to create and open an input stream for the resource specified
|
|
/// by the given path or uniform resource identifier.
|
|
///
|
|
/// If the stream cannot be opened for any reason, an
|
|
/// Exception is thrown.
|
|
///
|
|
/// The method first tries to interpret the given pathOrURI as an URI.
|
|
/// If this fails, the pathOrURI is treated as local filesystem path.
|
|
/// If this also fails, an exception is thrown.
|
|
///
|
|
/// Whoever calls the method is responsible for deleting
|
|
/// the returned stream.
|
|
|
|
std::istream * open(const std::string & basePathOrURI, const std::string & pathOrURI) const;
|
|
/// Tries to create and open an input stream for the resource specified
|
|
/// by the given path or uniform resource identifier.
|
|
///
|
|
/// pathOrURI is resolved against basePathOrURI (see URI::resolve() and
|
|
/// Path::resolve() for more information).
|
|
///
|
|
/// If the stream cannot be opened for any reason, an
|
|
/// Exception is thrown.
|
|
///
|
|
/// Whoever calls the method is responsible for deleting
|
|
/// the returned stream.
|
|
|
|
void registerStreamFactory(const std::string & scheme, URIStreamFactory * pFactory);
|
|
/// Registers a URIStreamFactory for the given scheme. If another factory
|
|
/// has already been registered for the scheme, an ExistsException is thrown.
|
|
///
|
|
/// The URIStreamOpener takes ownership of the factory and deletes it when it is
|
|
/// no longer needed (in other words, when the URIStreamOpener is deleted).
|
|
|
|
void unregisterStreamFactory(const std::string & scheme);
|
|
/// Unregisters and deletes the URIStreamFactory for the given scheme.
|
|
///
|
|
/// Throws a NotFoundException if no URIStreamFactory has been registered
|
|
/// for the given scheme.
|
|
|
|
bool supportsScheme(const std::string & scheme);
|
|
/// Returns true iff a URIStreamFactory for the given scheme
|
|
/// has been registered.
|
|
|
|
static URIStreamOpener & defaultOpener();
|
|
/// Returns a reference to the default URIStreamOpener.
|
|
|
|
protected:
|
|
std::istream * openFile(const Path & path) const;
|
|
std::istream * openURI(const std::string & scheme, const URI & uri) const;
|
|
|
|
private:
|
|
URIStreamOpener(const URIStreamOpener &);
|
|
URIStreamOpener & operator=(const URIStreamOpener &);
|
|
|
|
typedef std::map<std::string, URIStreamFactory *> FactoryMap;
|
|
|
|
FactoryMap _map;
|
|
mutable FastMutex _mutex;
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_URIStreamOpener_INCLUDED
|