private object CreateInstance(string extension, Type interfaceNeeded, DocumentClasses documentClass)
{
extension = FixExtension(extension);
ImplementationKey key = new ImplementationKey(interfaceNeeded, extension, documentClass);
ConstructorInfo ci = GetImplementation(key);
if (ci == null)
return null;
return CreateObject(ci);
}
private ConstructorInfo GetImplementation(ImplementationKey key)
{
lock (cachedCtors)
{
if (cachedCtors.ContainsKey(key))
return cachedCtors[key];
}
ConstructorInfo ci = FindImplementation(key);
lock (cachedCtors)
{
if (ci != null && !cachedCtors.ContainsKey(key))
cachedCtors.Add(key, ci);
}
return ci;
}
private static ConstructorInfo CheckModuleForImplementation(string sModule, ImplementationKey key)
{
try
{
Assembly newAss = Assembly.LoadFrom(sModule);
if (newAss == null)
return null;
if (!IsAssemblyAnFCSImplementation(newAss))
return null;
Type[] types = newAss.GetTypes();
foreach (Type t in types)
{
if (!key.InterfaceType.IsAssignableFrom(t))
continue;
if (!CanHandle(t, key.Extension))
continue;
if (key.DocumentClass == DocumentClasses.Any || GetDocumentClass(t) == DocumentClasses.Any || GetDocumentClass(t) == key.DocumentClass)
return GetCtor(t);
}
return null;
}
catch (BadImageFormatException)
{
return null;
}
catch (FileLoadException)
{
return null;
}
}
private ConstructorInfo FindImplementation(ImplementationKey key)
{
string[] locations = AssemblyLocation.FindInstalledFileLocations();
foreach (string location in locations)
{
if (string.IsNullOrEmpty(location))
continue;
try
{
string[] files = System.IO.Directory.GetFiles(location, "*FCS*.dll");
foreach (string s in files)
{
string sLower = s.ToLower(CultureInfo.InvariantCulture);
if (sLower.Contains("workshare.fcs.base.dll"))
continue;
if (sLower.IndexOf("fcs.lite") != -1)
continue;
if (sLower.IndexOf("tests.dll") != -1)
continue;
ConstructorInfo ci = CheckModuleForImplementation(s, key);
if (ci != null)
return ci;
}
}
catch (Exception )
{
}
}
if( key.Extension != "*" )
return GetImplementation(new ImplementationKey(key.InterfaceType, "*", key.DocumentClass));
return null;
}
