private static bool OpenWithFailover(ILoader loader, IGeoModel model, bool finished, bool showTryOthers)
{
// TODO: Maybe we can use the finished parameter to determine whether
// we need to present the 'Try Others' option. Maybe the finished
// arg should be renamed to hideTryOthers...
bool tryAgain = false;
do
{
try
{
loader.Open(model);
finished = true;
break;
}
catch (OpenException openException)
{
// TODO: Notify the user of the open failure
// "Failed to open URI because ...
Console.WriteLine(openException.Message);
// Do you want to Try again? Abort? Try other loaders?
List <Pair <object, string> > choices = new List <Pair <object, string> >(3);
choices.Add(new Pair <object, string>(OpenChoice.TryAgain, "Try Again"));
choices.Add(new Pair <object, string>(OpenChoice.TryOthers, "Try Other Formats"));
choices.Add(new Pair <object, string>(OpenChoice.Abort, "Cancel"));
IChoiceList choiceList = Factory <IChoiceList> .Instance.CreateDefault(choices);
OpenChoice decision = (OpenChoice)choiceList.Show();
switch (decision)
{
case OpenChoice.TryAgain:
tryAgain = true;
finished = false;
break;
case OpenChoice.TryOthers:
tryAgain = false;
finished = false;
break;
case OpenChoice.Abort:
tryAgain = false;
finished = true;
break;
}
}
}while (tryAgain);
return(finished);
}
public void Open(Uri uri, IGeoModel model)
{
string localPath = uri.LocalPath;
string uriBasename = Path.GetFileName(localPath);
// TODO: Some basic checks such as existence of the file
// should be done here.
List <object> rankedKeys = new List <object>();
foreach (object key in loaderFactory.Keys)
{
ILoader loader = loaderFactory.Create(key);
loader.Location = uri;
bool matched = false;
foreach (Regex pattern in loader.UriPatterns)
{
if (pattern.IsMatch(uriBasename))
{
matched = true;
break;
}
}
if (matched)
{
rankedKeys.Insert(0, key);
}
else
{
rankedKeys.Add(key);
}
}
bool finished = false;
List <object> maybeKeys = new List <object>();
foreach (string key in rankedKeys)
{
ILoader loader = loaderFactory.Create(key);
loader.Location = uri;
// TODO: Wrap this is a try..catch and deal with failures such
// as file not found.
Recognition recognition = loader.Recognize();
if (recognition == Recognition.Yes)
{
finished = OpenWithFailover(loader, model, finished, true);
if (finished)
{
break;
}
maybeKeys.Add(key);
}
else if (recognition == Recognition.Maybe)
{
maybeKeys.Add(key);
}
}
if (!finished)
{
if (maybeKeys.Count == 1)
{
ILoader loader = loaderFactory.Create(maybeKeys[0]);
loader.Location = uri;
finished = OpenWithFailover(loader, model, finished, false);
}
else
{
do
{
// Present the user with a choice
List <Pair <object, string> > choices = new List <Pair <object, string> >();
foreach (object key in maybeKeys)
{
ILoader loader = loaderFactory.Create(key);
loader.Location = uri;
choices.Add(new Pair <object, string>(key, loader.Description));
}
IChoiceList choiceList = Factory <IChoiceList> .Instance.CreateDefault(choices);
object chosenKey = choiceList.Show();
if (chosenKey != null)
{
ILoader loader = loaderFactory.Create(chosenKey);
loader.Location = uri;
finished = OpenWithFailover(loader, model, finished, true);
}
else
{
finished = true;
}
}while (!finished);
}
}
}