/// <summary>
/// Factory method to construct a typed activity based on its typename
/// </summary>
/// <param name="typeName">Type name to instantiate</param>
/// <returns>typed activity</returns>
public static WorkflowActivity CreateActivity(string typeName)
{
if (typeName == null)
{
return(null);
}
// ensure that the activity is in the fully-qualified form
// this assumes the WorkflowActivity class is in the same namespace as the one we are about to load
string fullName = typeof(WorkflowActivity).FullName;
if (typeName.StartsWith(fullName) == false)
{
fullName = fullName.Replace(typeof(WorkflowActivity).Name, "");
typeName = fullName + typeName;
}
Type activityType = Type.GetType(typeName);
if (activityType == null)
{
TraceLog.TraceError("Could not find type name " + typeName);
return(null);
}
WorkflowActivity activity = Activator.CreateInstance(activityType) as WorkflowActivity;
return(activity);
}
/// <summary>
/// Factory method to construct a typed activity based on its definition
/// </summary>
/// <param name="definition">Json value corresponding to activity definition</param>
/// <param name="instance">Workflow instance</param>
/// <returns>typed activity</returns>
public static WorkflowActivity CreateActivity(JObject definition, WorkflowInstance instance)
{
string typeName = (string)definition["Name"];
WorkflowActivity activity = CreateActivity(typeName);
if (activity == null)
{
return(null);
}
foreach (var prop in definition)
{
switch (prop.Value.Type)
{
case JTokenType.Object: // a sub-object (typically a nested activity) - store as a string
activity.InputParameters[prop.Key] = prop.Value.ToString();
break;
case JTokenType.Array: // treat as a string template and format appropriately
activity.InputParameters[prop.Key] = FormatStringTemplate(instance, prop.Value.ToString());
break;
default: // treat as a string and expand any variables
activity.InputParameters[prop.Key] = ExpandVariables(instance, (string)prop.Value.ToString());
break;
}
}
return(activity);
}