public bool TryChainUp(IFileSystemResourceAccessor potentialBaseResourceAccessor, string path, out IFileSystemResourceAccessor resultResourceAccessor)
{
resultResourceAccessor = null;
string resourcePathName = potentialBaseResourceAccessor.ResourcePathName;
if (string.IsNullOrEmpty(resourcePathName) || !potentialBaseResourceAccessor.IsFile ||
!".iso".Equals(DosPathHelper.GetExtension(resourcePathName), StringComparison.OrdinalIgnoreCase))
{
return(false);
}
lock (_syncObj)
{
string key = potentialBaseResourceAccessor.CanonicalLocalResourcePath.Serialize();
try
{
IsoResourceProxy proxy;
if (!_isoUsages.TryGetValue(key, out proxy))
{
_isoUsages.Add(key, proxy = CreateIsoResourceProxy(key, potentialBaseResourceAccessor));
}
resultResourceAccessor = new IsoResourceAccessor(this, proxy, path);
}
catch (Exception e)
{
ServiceRegistration.Get <ILogger>().Warn("IsoResourceProvider: Error chaining up to '{0}'", e, potentialBaseResourceAccessor.CanonicalLocalResourcePath);
return(false);
}
return(true);
}
}
public bool IsResource(IFileSystemResourceAccessor baseResourceAccessor, string path)
{
string resourceName = baseResourceAccessor.ResourceName;
if (string.IsNullOrEmpty(resourceName) || !baseResourceAccessor.IsFile)
{
return(false);
}
// Test if we have already an ISO proxy for that ISO file...
lock (_syncObj)
{
string key = baseResourceAccessor.CanonicalLocalResourcePath.Serialize();
try
{
IsoResourceProxy proxy;
if (_isoUsages.TryGetValue(key, out proxy))
{
lock (proxy.SyncObj)
return(IsoResourceAccessor.IsResource(proxy.DiskFileSystem, path));
}
}
catch (Exception)
{
return(false);
}
}
// ... if not, test the resource in a new disk file system instance
using (Stream underlayingStream = baseResourceAccessor.OpenRead())
{
try
{
IFileSystem diskFileSystem = IsoResourceProxy.GetFileSystem(underlayingStream);
using (diskFileSystem as IDisposable)
return(IsoResourceAccessor.IsResource(diskFileSystem, path));
}
catch
{
return(false);
}
}
}
public bool TryChainUp(IResourceAccessor potentialBaseResourceAccessor, string path, out IResourceAccessor resultResourceAccessor)
{
resultResourceAccessor = null;
string resourcePathName = potentialBaseResourceAccessor.ResourcePathName;
if (string.IsNullOrEmpty(resourcePathName) || !potentialBaseResourceAccessor.IsFile ||
!".iso".Equals(DosPathHelper.GetExtension(resourcePathName), StringComparison.OrdinalIgnoreCase))
return false;
lock (_syncObj)
{
string key = potentialBaseResourceAccessor.CanonicalLocalResourcePath.Serialize();
try
{
IsoResourceProxy proxy;
if (!_isoUsages.TryGetValue(key, out proxy))
_isoUsages.Add(key, proxy = CreateIsoResourceProxy(key, potentialBaseResourceAccessor));
resultResourceAccessor = new IsoResourceAccessor(this, proxy, path);
}
catch (Exception e)
{
ServiceRegistration.Get<ILogger>().Warn("IsoResourceProvider: Error chaining up to '{0}'", e, potentialBaseResourceAccessor.CanonicalLocalResourcePath);
return false;
}
return true;
}
}
