public AllorsDirectoryInfo(DirectoryInfo directoryInfo)
{
this.directoryInfo = directoryInfo;
if (directoryInfo.Parent != null)
{
this.parent = new AllorsDirectoryInfo(directoryInfo.Parent);
}
}
private AllorsDirectoryInfo GetCommonAncestor(AllorsDirectoryInfo destination)
{
if (destination.IsAncestor(this))
{
return(this);
}
return(this.parent.GetCommonAncestor(destination));
}
private void BuildAncestors(AllorsDirectoryInfo root, List <AllorsDirectoryInfo> ancestors)
{
if (!this.directoryInfo.FullName.Equals(this.directoryInfo.Root.FullName))
{
if (!this.directoryInfo.FullName.Equals(root.directoryInfo.FullName))
{
ancestors.Add(this);
this.parent.BuildAncestors(root, ancestors);
}
}
}
private bool IsAncestor(AllorsDirectoryInfo ancestor)
{
if (this.directoryInfo.FullName.Equals(ancestor.directoryInfo.FullName))
{
return(true);
}
if (this.parent != null)
{
return(this.parent.IsAncestor(ancestor));
}
return(false);
}
public string GetRelativeName(DirectoryInfo baseDirectoryInfo)
{
var baseDirectory = new AllorsDirectoryInfo(baseDirectoryInfo);
var directory = new AllorsDirectoryInfo(fileInfo.Directory);
string relativePath = directory.GetRelativeName(baseDirectory);
if (relativePath == null)
{
return(null);
}
return(Path.Combine(relativePath, this.fileInfo.Name));
}
internal string GetRelativeName(AllorsDirectoryInfo baseDirectory)
{
if (this.directoryInfo.Root.FullName.Equals(baseDirectory.directoryInfo.Root.FullName))
{
AllorsDirectoryInfo commonAncestor = this.GetCommonAncestor(baseDirectory);
var ancestors = new List <AllorsDirectoryInfo>();
this.BuildAncestors(commonAncestor, ancestors);
var baseAncestors = new List <AllorsDirectoryInfo>();
baseDirectory.BuildAncestors(commonAncestor, baseAncestors);
var relativePath = new StringBuilder();
foreach (AllorsDirectoryInfo baseAncestor in baseAncestors)
{
if (relativePath.Length > 0)
{
relativePath.Append(Path.DirectorySeparatorChar);
}
relativePath.Append("..");
}
for (int i = ancestors.Count - 1; i >= 0; --i)
{
AllorsDirectoryInfo ancestor = ancestors[i];
if (relativePath.Length > 0)
{
relativePath.Append(Path.DirectorySeparatorChar);
}
relativePath.Append(ancestor.directoryInfo.Name);
}
return(relativePath.ToString());
}
return(null);
}