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