/// <summary>
/// Add a resolved callback, a rejected callback and a progress callback.
/// The resolved callback chains a value promise (optionally converting to a different value type).
/// </summary>
public IPromise <ConvertedT> Then <ConvertedT>(
Func <IPromise <ConvertedT> > onResolved,
Func <Exception, IPromise <ConvertedT> > onRejected,
Action <float> onProgress)
{
if (CurState == PromiseState.Resolved)
{
try
{
return(onResolved());
}
catch (Exception ex)
{
return(Promise <ConvertedT> .Rejected(ex));
}
}
// This version of the function must supply an onResolved.
// Otherwise there is now way to get the converted value to pass to the resulting promise.
// Argument.NotNull(() => onResolved);
var resultPromise = new Promise <ConvertedT>();
resultPromise.WithName(Name);
Action resolveHandler = () =>
{
onResolved()
.Progress(progress => resultPromise.ReportProgress(progress))
.Then(
// Should not be necessary to specify the arg type on the next line, but Unity (mono) has an internal compiler error otherwise.
chainedValue => resultPromise.Resolve(chainedValue),
ex => resultPromise.Reject(ex)
);
};
Action <Exception> rejectHandler = ex =>
{
if (onRejected == null)
{
resultPromise.Reject(ex);
return;
}
try
{
onRejected(ex)
.Then(
chainedValue => resultPromise.Resolve(chainedValue),
callbackEx => resultPromise.Reject(callbackEx)
);
}
catch (Exception callbackEx)
{
resultPromise.Reject(callbackEx);
}
};
ActionHandlers(resultPromise, resolveHandler, rejectHandler);
if (onProgress != null)
{
ProgressHandlers(this, onProgress);
}
return(resultPromise);
}
/// <summary>
/// Add a resolved callback, a rejected callback and a progress callback.
/// </summary>
public IPromise Then(Action onResolved, Action <Exception> onRejected, Action <float> onProgress)
{
if (CurState == PromiseState.Resolved)
{
try
{
onResolved();
return(this);
}
catch (Exception ex)
{
return(Rejected(ex));
}
}
var resultPromise = new Promise();
resultPromise.WithName(Name);
Action resolveHandler;
if (onResolved != null)
{
resolveHandler = () =>
{
onResolved();
resultPromise.Resolve();
};
}
else
{
resolveHandler = resultPromise.Resolve;
}
Action <Exception> rejectHandler;
if (onRejected != null)
{
rejectHandler = ex =>
{
if (onRejected != null)
{
onRejected(ex);
resultPromise.Resolve();
return;
}
resultPromise.Reject(ex);
};
}
else
{
rejectHandler = resultPromise.Reject;
}
ActionHandlers(resultPromise, resolveHandler, rejectHandler);
if (onProgress != null)
{
ProgressHandlers(this, onProgress);
}
return(resultPromise);
}
/// <summary>
/// Takes a function that yields an enumerable of promises.
/// Converts to a value promise.
/// Returns a promise that resolves when the first of the promises has resolved.
/// </summary>
public IPromise <ConvertedT> ThenRace <ConvertedT>(Func <IEnumerable <IPromise <ConvertedT> > > chain)
{
return(Then(() => Promise <ConvertedT> .Race(chain())));
}
