/// <summary> Get the item html head writer indicated by the assembly and class </summary>
/// <param name="Assembly"> Name of the assembly within which this class resides, unless this
/// is one of the default class/assembly included in the core code </param>
/// <param name="Class"> Fully qualified (including namespace) name of the class used
/// for this class/assembly information </param>
/// <returns> Fully built item html head writer object, or NULL </returns>
public static iItemHtmlHeadWriter Get_ItemHtmlHeadWriter(string Assembly, string Class)
{
// Must have a class value
if (String.IsNullOrEmpty(Class))
{
return(null);
}
// Determine the key
string key = Class;
if (!String.IsNullOrEmpty(Assembly))
{
key = Assembly + ":" + Class;
}
// Always lock here, since we may need to create one
lock (lockObj)
{
// If it is contained in the dictionary already, just return it
if (headWriters.ContainsKey(key))
{
return(headWriters[key]);
}
// Try to create this then
iItemHtmlHeadWriter returnObj = createWriter(Assembly, Class);
// Save in the dictionary
headWriters[key] = returnObj;
// Return it
return(returnObj);
}
}
private static iItemHtmlHeadWriter createWriter(string assembly, string className)
{
// If this is just a standard object, try to create it here
if (String.IsNullOrEmpty(assembly))
{
switch (className)
{
case "SobekCM.Library.ItemViewer.HtmlHeadWriters.DublinCore_ItemHtmlHeadWriter":
return(new DublinCore_ItemHtmlHeadWriter());
case "SobekCM.Library.ItemViewer.HtmlHeadWriters.MODS_ItemHtmlHeadWriter":
return(new MODS_ItemHtmlHeadWriter());
case "SobekCM.Library.ItemViewer.HtmlHeadWriters.OpenGraph_ItemHtmlHeadWriter":
return(new OpenGraph_ItemHtmlHeadWriter());
}
// If it made it here, there is no assembly, but it is an unexpected type.
// Just create it from the same assembly then
try
{
Assembly dllAssembly = System.Reflection.Assembly.GetCallingAssembly();
Type prototyperType = dllAssembly.GetType(className);
iItemHtmlHeadWriter returnObj = (iItemHtmlHeadWriter)Activator.CreateInstance(prototyperType);
return(returnObj);
}
catch (Exception)
{
// Not sure exactly what to do here, honestly
return(null);
}
}
// An assembly was indicated
try
{
// Try to find the file/path for this assembly then
Assembly dllAssembly = null;
string assemblyFilePath = Engine_ApplicationCache_Gateway.Configuration.Extensions.Get_Assembly(assembly);
if (assemblyFilePath != null)
{
dllAssembly = Assembly.LoadFrom(assemblyFilePath);
}
Type prototyperType = dllAssembly.GetType(className);
iItemHtmlHeadWriter returnObj = (iItemHtmlHeadWriter)Activator.CreateInstance(prototyperType);
return(returnObj);
}
catch (Exception ee)
{
// Not sure exactly what to do here, honestly
if (ee.Message.Length > 0)
{
return(null);
}
return(null);
}
}
