/// <summary>
/// Express a local path as a known root and a relative canonicalised path.
/// </summary>
/// <remarks>
/// Finds the storage root closest to the path, ie. smallest enclosing subtree.
/// Returns false if no root can be found, or if the qualified path exists under a graft
/// point and is therefore 'shadowed'.
/// </remarks>
public bool TryResolveQualifiedPath(string absolutePath, out QualifiedPath qualifiedPath)
{
qualifiedPath = default;
var uri = new Uri(absolutePath);
foreach (var root in rootsLongestToShortest)
{
if (!PathUtils.TryGetRelativeSegments(root.RootUri, uri, out var relativePathParts))
{
continue;
}
var canonicalisedPath = fileSystemApi.GetCanonicalRelativePath(root.RootUri.LocalPath, relativePathParts);
// Found a 'best' qualified path.
qualifiedPath = new QualifiedPath(root, canonicalisedPath);
if (!graftsByParent.TryGetValue(root, out var grafts))
{
return(true); // No grafts present to 'shadow' this hierarchy.
}
var comparer = new PathEqualityComparer(root.Casing);
if (grafts.Any(g => g.GraftPoint.RelativePath.Contains(canonicalisedPath, comparer)))
{
// The qualified path is shadowed by a graft point.
return(false);
}
return(true);
}
// No containing root was found.
return(false);
}
public Graft(QualifiedPath graftPoint, LocalRoot childRoot)
{
if (!graftPoint.RelativePath.IsContainer())
{
throw new ArgumentException($"Graft point must be a container: {graftPoint}", nameof(graftPoint));
}
GraftPoint = graftPoint;
ChildRoot = childRoot ?? throw new ArgumentNullException(nameof(childRoot));
}
/// <summary>
/// Resolve the qualified path to an OS path and return a FileInfo wrapper.
/// </summary>
public FileInfo ResolveToFile(QualifiedPath qualifiedPath)
{
AssertLocalRootExistsInModel(qualifiedPath.Root);
if (qualifiedPath.RelativePath.IsContainer())
{
throw new ArgumentException($"Cannot resolve a container path to a file: {qualifiedPath}", nameof(qualifiedPath));
}
var absoluteUri = new Uri(qualifiedPath.Root.RootUri, qualifiedPath.RelativePath.ToString());
return(new FileInfo(absoluteUri.LocalPath));
}
/// <summary>
/// Find the named root which ultimately owns the path.
/// </summary>
public NamedRoot FindNamedRoot(QualifiedPath path)
{
var currentNode = path.Root;
AssertLocalRootExistsInModel(currentNode);
var traversed = new HashSet <LocalRoot> {
currentNode
};
while (graftsByChild.TryGetValue(currentNode, out var graft))
{
currentNode = graft.ChildRoot;
// Sanity check. Should be impossible to configure such a situation.
if (!traversed.Add(currentNode))
{
throw new InvalidOperationException("Cycle detected in graph.");
}
}
return(namedRoots.FirstOrDefault(r => r.LocalRoot == currentNode));
}
public AbstractPath MapToAbstractPath(QualifiedPath qualifiedPath, IDiagnosticsLog log = null)
{
var currentNode = qualifiedPath.Root;
AssertLocalRootExistsInModel(currentNode);
var traversed = new HashSet <LocalRoot> {
currentNode
};
var paths = new Stack <RelativePath>();
paths.Push(qualifiedPath.RelativePath);
if (!PassesFilter(currentNode, paths, log))
{
return(null);
}
while (graftsByChild.TryGetValue(currentNode, out var graft))
{
currentNode = graft.GraftPoint.Root;
paths.Push(graft.GraftPoint.RelativePath);
// Sanity check. Should be impossible to configure such a situation.
if (!traversed.Add(currentNode))
{
throw new InvalidOperationException("Cycle detected in graph.");
}
if (!PassesFilter(currentNode, paths, log))
{
return(null);
}
}
foreach (var namedRoot in namedRoots)
{
if (namedRoot.LocalRoot != currentNode)
{
continue;
}
return(new AbstractPath(namedRoot, RelativePath.Combine(paths)));
}
return(null);
}
