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URIStreamOpener.cpp

//
// URIStreamOpener.cpp
//
// $Id: //poco/1.2/Foundation/src/URIStreamOpener.cpp#1 $
//
// Library: Foundation
// Package: URI
// Module:  URIStreamOpener
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/URIStreamOpener.h"
#include "Poco/URIStreamFactory.h"
#include "Poco/FileStreamFactory.h"
#include "Poco/URI.h"
#include "Poco/Path.h"
#include "Poco/SingletonHolder.h"
#include "Poco/Exception.h"


namespace Poco {


URIStreamOpener::URIStreamOpener()
{
      registerStreamFactory("file", new FileStreamFactory);
}


00055 URIStreamOpener::~URIStreamOpener()
{
      for (FactoryMap::iterator it = _map.begin(); it != _map.end(); ++it)
            delete it->second;
}


00062 std::istream* URIStreamOpener::open(const URI& uri) const
{
      FastMutex::ScopedLock lock(_mutex);

      std::string scheme;
      if (uri.isRelative())
            scheme = "file";
      else
            scheme = uri.getScheme();
      FactoryMap::const_iterator it = _map.find(scheme);
      if (it != _map.end())
            return it->second->open(uri);
      else
            throw UnknownURISchemeException(scheme);
}


00079 std::istream* URIStreamOpener::open(const std::string& pathOrURI) const
{
      FastMutex::ScopedLock lock(_mutex);

      try
      {
            URI uri(pathOrURI);
            std::string scheme(uri.getScheme());
            FactoryMap::const_iterator it = _map.find(scheme);
            if (it != _map.end())
                  return it->second->open(uri);
      }
      catch (Exception&)
      {
      }
      Path path(pathOrURI, Path::PATH_GUESS);
      return openFile(path);
}


00099 std::istream* URIStreamOpener::open(const std::string& basePathOrURI, const std::string& pathOrURI) const
{
      FastMutex::ScopedLock lock(_mutex);

      try
      {
            URI uri(basePathOrURI);
            std::string scheme(uri.getScheme());
            FactoryMap::const_iterator it = _map.find(scheme);
            if (it != _map.end())
            {
                  uri.resolve(pathOrURI);
                  return it->second->open(uri);
            }
      }
      catch (Exception&)
      {
      }
      Path base(basePathOrURI, Path::PATH_GUESS);
      Path path(pathOrURI, Path::PATH_GUESS);
      base.resolve(path);
      return openFile(base);
}

      
00124 void URIStreamOpener::registerStreamFactory(const std::string& scheme, URIStreamFactory* pFactory)
{
      poco_check_ptr (pFactory);

      FastMutex::ScopedLock lock(_mutex);
      if (_map.find(scheme) == _map.end())
      {
            _map[scheme] = pFactory;
      }
      else throw ExistsException("An URIStreamFactory for the given scheme has already been registered", scheme);
}


00137 void URIStreamOpener::unregisterStreamFactory(const std::string& scheme)
{
      FastMutex::ScopedLock lock(_mutex);
      
      FactoryMap::iterator it = _map.find(scheme);
      if (it != _map.end())
      {
            URIStreamFactory* pFactory = it->second;
            _map.erase(it);
            delete pFactory;
      }
      else throw NotFoundException("No URIStreamFactory has been registered for the given scheme", scheme);
}


00152 bool URIStreamOpener::supportsScheme(const std::string& scheme)
{
      FastMutex::ScopedLock lock(_mutex);
      return _map.find(scheme) != _map.end();
}


00159 URIStreamOpener& URIStreamOpener::defaultOpener()
{
      static SingletonHolder<URIStreamOpener> sh;
      return *sh.get();
}


00166 std::istream* URIStreamOpener::openFile(const Path& path) const
{
      FileStreamFactory factory;
      return factory.open(path);
}



} // namespace Poco

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