/// <summary>
/// Opens an archive for file reading.
/// </summary>
/// <remarks>
/// The archives are created using class factories within
/// extension libraries.
/// </remarks>
/// <param name="filename">The filename that will be opened</param>
/// <param name="archiveType">The library that contains the data-handling code</param>
/// <returns>
/// If the function succeeds, a valid pointer to an Archive object is returned.
/// <para/>
/// If the function fails, an exception is thrown.
/// </returns>
public Archive Load(string filename, string archiveType)
{
Archive arch = null;
if (!_archives.TryGetValue(filename, out arch))
{
// Search factories
ArchiveFactory fac = null;
if (!_factories.TryGetValue(archiveType, out fac))
{
throw ExceptionFactory.CreateFatalException("Cannot find an archive factory to deal with archive of type {0}", archiveType);
}
arch = fac.CreateInstance(filename);
arch.Load();
_archives.Add(filename, arch);
}
return(arch);
}
