object GetThing(Variable variable)
{
// Any values the user specifies have priority. This allows you to override
// what the USER variable means for example.
object thing = "";
if (VariableValues != null &&
!String.IsNullOrEmpty(variable.Name) &&
VariableValues.TryGetValue(variable.Name, out thing))
{
log.DebugFormat(CultureInfo.InvariantCulture, "GetThing for variable {0}, found entry in VariableValues of {1}", variable.Name, thing);
return(thing);
}
// Given the user an opportunity to replace via an event.
// If this is a built in variable try use it to initialise the Thing.
var e = OnVariableReplacement;
if (e != null)
{
object variableVal = null;
try
{
variableVal = AutoZillaVariables.GetByName(variable.Name);
}
catch
{
}
var args = new VariableReplacementEventArgs(variable.Name, variableVal);
e(this, args);
if (args.Thing != null)
{
log.DebugFormat(CultureInfo.InvariantCulture, "GetThing for variable {0}, event handler supplied the value {1}", variable.Name, args.Thing);
return(args.Thing);
}
}
// Deal with all built in variables. This will throw if the
// variable is not found.
thing = AutoZillaVariables.GetByName(variable.Name);
log.DebugFormat(CultureInfo.InvariantCulture, "GetThing for variable {0}, used built-in value of {1}", variable.Name, thing);
return(thing);
}
void NoOpVariableReplacementViaEventsWorks_OnVariableReplacement(object sender, VariableReplacementEventArgs e)
{
}
void VariableReplacementViaEventsWorks_OnVariableReplacement(object sender, VariableReplacementEventArgs e)
{
e.Thing = DUMMY_VALUE;
}
