/// <summary>
/// Invoke the best available match (from a list of methods available) for the supplied parameters.
/// If no method can be called using the supplied parameters, an exception is raised. Any exceptions
/// raised by the called method will be logged and then re-thrown.
/// </summary>
/// <param name="target">The object on which to invoke a method.</param>
/// <param name="parameters">A hashtable of parameter name/value pairs. All parameters given
/// must be used in the method call in order for a method to be considered.</param>
/// <returns>The return value of the invocation.</returns>
public object Invoke(object target, Hashtable parameters)
{
MethodInvokable invokable = DetermineBestMatch(parameters);
if (invokable == null)
{
throw new GDAException("No compatible method found to invoke for the given parameters.");
}
return(invokable.Invoke(target));
}
/// <summary>
/// Invoke the underlying method on the given target object using the supplied parameter values.
/// Any exception raised by performing the method call is logged and then exposed as-is.
/// </summary>
/// <param name="target">The object on which to invoke the method.</param>
/// <param name="parameters">A hashtable of parameter name/value pairs.</param>
/// <returns>The return value of the invocation.</returns>
public object Invoke(object target, Hashtable parameters)
{
MethodInvokable mi = PrepareInvoke(parameters);
if (mi.MatchIndicator >= 0)
{
return(Invoke(target, mi.ParameterValues));
}
else
{
throw new GDAException("Unable to invoke method using given parameters.");
return(null);
}
}
private MethodInvokable DetermineBestMatch(Hashtable parameters)
{
MethodInvokable best = null;
foreach (MethodInvoker invoker in invokers)
{
MethodInvokable invokable = invoker.PrepareInvoke(parameters);
bool isBetter = best == null && invokable != null && invokable.MatchIndicator > 0;
isBetter |= best != null && invokable != null && invokable.MatchIndicator > best.MatchIndicator;
if (isBetter)
{
best = invokable;
}
}
return(best);
}