internal static Task<PackageFeed> GetPackageFeedFromLocation(string location, bool recursive = false)
{
return Recognizer.Recognize(location, ensureLocal: true).ContinueWithParent(antecedent => {
var info = antecedent.Result;
PackageFeed result = null;
string locationKey = null;
if (info.IsPackageFeed) {
if (info.IsFolder) {
locationKey = Path.Combine(info.FullPath, info.Wildcard ?? "*");
if (AllFeeds.ContainsKey(locationKey)) {
return AllFeeds[locationKey];
}
result = new DirectoryPackageFeed(info.FullPath, info.Wildcard, recursive);
}
else if (info.IsFile) {
if (AllFeeds.ContainsKey(info.FullPath)) {
return AllFeeds[info.FullPath];
}
if (info.IsAtom) {
result = new AtomPackageFeed(info.FullPath);
}
if (info.IsArchive) {
result = new ArchivePackageFeed(info.FullPath);
}
}
// TODO: URL based feeds
else if (info.IsURL) {
if (AllFeeds.ContainsKey(info.FullUrl.AbsoluteUri)) {
return AllFeeds[info.FullUrl.AbsoluteUri];
}
if (info.IsAtom) {
result = new AtomPackageFeed(info.FullUrl);
}
}
}
if (result != null) {
result.RecognitionInfo = info;
lock (AllFeeds) {
if (!AllFeeds.ContainsKey(locationKey ?? result.Location)) {
AllFeeds.Add(locationKey ?? result.Location, result);
}
else
result = AllFeeds[locationKey ?? result.Location];
// GS01: TODO: This is a crappy way of avoiding a deadlock when the same feed has been requested twice by two different threads.
}
}
return result;
});
}
/// <summary>
/// Gets the package feed from the location.
///
/// This will first attempt to look up a matching instance in the AllFeeds collection (so that multiple requests for the same feed return a single object)
///
/// It asks the recognizer to identify the location, and creates a specific subclass instance based on the results.
///
/// If it cannot identify or read the target, the task will return null.
/// </summary>
/// <param name="location">The feed location (url, file, directory).</param>
/// <returns>A Task with a return value of the PackageFeed. May be null if invalid.</returns>
/// <remarks></remarks>
internal static Task<PackageFeed> GetPackageFeedFromLocation(string location)
{
if( InstalledPackageFeed.CanonicalLocation.Equals(location, StringComparison.CurrentCultureIgnoreCase)) {
return Task<PackageFeed>.Factory.StartNew(() => InstalledPackageFeed.Instance).AutoManage();
}
if( SessionPackageFeed.CanonicalLocation.Equals(location, StringComparison.CurrentCultureIgnoreCase)) {
return Task<PackageFeed>.Factory.StartNew(() => SessionPackageFeed.Instance).AutoManage();
}
return Recognizer.Recognize(location).ContinueWith(antecedent => {
var info = antecedent.Result;
PackageFeed result = null;
string locationKey = null;
if (info.IsPackageFeed) {
if (info.IsFolder) {
locationKey = Path.Combine(info.FullPath, info.Filter );
if (_allFeeds.ContainsKey(locationKey)) {
return _allFeeds[locationKey];
}
result = new DirectoryPackageFeed(info.FullPath, info.Filter);
}
else if (info.IsFile) {
if (_allFeeds.ContainsKey(info.FullPath)) {
return _allFeeds[info.FullPath];
}
if (info.IsAtom) {
result = new AtomPackageFeed(info.FullPath);
}
/*
if (info.IsArchive) {
result = new ArchivePackageFeed(info.FullPath);
}
* */
}
// TODO: URL based feeds
else if (info.IsURL) {
if (_allFeeds.ContainsKey(info.FullUrl.AbsoluteUri)) {
return _allFeeds[info.FullUrl.AbsoluteUri];
}
if (info.IsAtom) {
result = new AtomPackageFeed(info.FullUrl);
}
}
} else if(info.IsPackageFile) {
// SessionPackageFeed.Instance.Add(Package.GetPackageFromFilename(info.FullPath));
result = new DirectoryPackageFeed(Path.GetDirectoryName(info.FullPath),Path.GetFileName(info.FullPath));
// Hack of the day:
// Since, I have to look up this file as a feed again later, based on the original path (likely, an http:// location)
// we have to forcably set the location in the feed itself to reflect this.
result.Location = location;
locationKey = location;
}
if (result != null) {
result.RecognitionInfo = info;
lock (_allFeeds) {
if (!_allFeeds.ContainsKey(locationKey ?? result.Location)) {
_allFeeds.Add(locationKey ?? result.Location, result);
}
else {
result = _allFeeds[locationKey ?? result.Location];
}
// GS01: TODO: This is a crappy way of avoiding a deadlock when the same feed has been requested twice by two different threads.
}
}
return result;
}, TaskContinuationOptions.AttachedToParent );
}
