private static object[] CreateArgs(XmlNode configuration)
{
List <object> argList = new List <object>();
// see if we can find "args" children that specify arguments to pass in.
if (configuration != null && configuration.HasChildNodes)
{
XmlNodeList argNodes = configuration.SelectNodes("args/arg");
if (argNodes.Count > 0)
{
Dictionary <string, string> argDict = new Dictionary <string, string>();
foreach (XmlNode argNode in argNodes)
{
string argName = XmlUtils.GetMandatoryAttributeValue(argNode, "name");
string argVal = XmlUtils.GetMandatoryAttributeValue(argNode, "value");
argDict.Add(argName, argVal);
}
string argValue;
if (argDict.TryGetValue("xpathToConfigurationNode", out argValue))
{
// "xpathToConfigurationNode" is a special argument for passing the nodes
// that the object we're creating knows how to process.
// NOTE: assume the xpath is with respect to the dynamicloaderinfo "configuration" node
XmlNode configNodeForObject = configuration.SelectSingleNode(argValue);
if (configNodeForObject != null)
{
argList.Add(configNodeForObject);
}
}
}
}
return(argList.Count > 0 ? argList.ToArray() : null);
}
/// <summary>
/// Dynamically find an assembly and create an object of the name to class.
/// configuration has assemblyPath and class (fully qualified) as in other overloads.
/// The constructor arguments are supplied explicitly.
/// </summary>
/// <returns></returns>
static public Object CreateObject(XmlNode configuration, params object[] args)
{
string assemblyPath = XmlUtils.GetMandatoryAttributeValue(configuration, "assemblyPath");
// JohnT: see AddAssemblyPathInfo. We use this when the object we're trying to persist
// as a child of another object is null.
if (assemblyPath == "null")
{
return(null);
}
string className = XmlUtils.GetMandatoryAttributeValue(configuration, "class");
return(CreateObject(assemblyPath, className, args));
}
// Return the class of object that will be created if CreateObjectUsingLoaderNode is called with this argument.
// Return null if dynamic loader node not found or if it doesn't specify a valid class.
static public Type TypeForLoaderNode(XmlNode parentConfigNode)
{
XmlNode configuration = parentConfigNode.SelectSingleNode("dynamicloaderinfo");
if (configuration == null)
{
return(null);
}
string assemblyPath = XmlUtils.GetMandatoryAttributeValue(configuration, "assemblyPath");
if (assemblyPath == "null")
{
return(null);
}
string className = XmlUtils.GetMandatoryAttributeValue(configuration, "class");
Assembly assembly;
GetAssembly(assemblyPath, out assembly);
return(assembly.GetType(className.Trim()));
}
