/// <summary>Resolve the pathname p relative to root InodeDir</summary>
/// <param name="p">- inout path</param>
/// <param name="resolveLastComponent"></param>
/// <returns>ResolveResult which allows further resolution of the remaining path</returns>
/// <exception cref="System.IO.FileNotFoundException"/>
internal virtual InodeTree.ResolveResult <T> Resolve(string p, bool resolveLastComponent
)
{
// TO DO: - more efficient to not split the path, but simply compare
string[] path = BreakIntoPathComponents(p);
if (path.Length <= 1)
{
// special case for when path is "/"
InodeTree.ResolveResult <T> res = new InodeTree.ResolveResult <T>(InodeTree.ResultKind
.isInternalDir, root.InodeDirFs, root.fullPath, SlashPath);
return(res);
}
InodeTree.INodeDir <T> curInode = root;
int i;
// ignore first slash
for (i = 1; i < path.Length - (resolveLastComponent ? 0 : 1); i++)
{
InodeTree.INode <T> nextInode = curInode.ResolveInternal(path[i]);
if (nextInode == null)
{
StringBuilder failedAt = new StringBuilder(path[0]);
for (int j = 1; j <= i; ++j)
{
failedAt.Append('/').Append(path[j]);
}
throw (new FileNotFoundException(failedAt.ToString()));
}
if (nextInode is InodeTree.INodeLink)
{
InodeTree.INodeLink <T> link = (InodeTree.INodeLink <T>)nextInode;
Path remainingPath;
if (i >= path.Length - 1)
{
remainingPath = SlashPath;
}
else
{
StringBuilder remainingPathStr = new StringBuilder("/" + path[i + 1]);
for (int j = i + 2; j < path.Length; ++j)
{
remainingPathStr.Append('/').Append(path[j]);
}
remainingPath = new Path(remainingPathStr.ToString());
}
InodeTree.ResolveResult <T> res = new InodeTree.ResolveResult <T>(InodeTree.ResultKind
.isExternalDir, link.targetFileSystem, nextInode.fullPath, remainingPath);
return(res);
}
else
{
if (nextInode is InodeTree.INodeDir)
{
curInode = (InodeTree.INodeDir <T>)nextInode;
}
}
}
// We have resolved to an internal dir in mount table.
Path remainingPath_1;
if (resolveLastComponent)
{
remainingPath_1 = SlashPath;
}
else
{
// note we have taken care of when path is "/" above
// for internal dirs rem-path does not start with / since the lookup
// that follows will do a children.get(remaningPath) and will have to
// strip-out the initial /
StringBuilder remainingPathStr = new StringBuilder("/" + path[i]);
for (int j = i + 1; j < path.Length; ++j)
{
remainingPathStr.Append('/').Append(path[j]);
}
remainingPath_1 = new Path(remainingPathStr.ToString());
}
InodeTree.ResolveResult <T> res_1 = new InodeTree.ResolveResult <T>(InodeTree.ResultKind
.isInternalDir, curInode.InodeDirFs, curInode.fullPath, remainingPath_1);
return(res_1);
}
/// <exception cref="URISyntaxException"/>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.Apache.Hadoop.FS.FileAlreadyExistsException"/>
/// <exception cref="Org.Apache.Hadoop.FS.UnsupportedFileSystemException"/>
private void CreateLink(string src, string target, bool isLinkMerge, UserGroupInformation
aUgi)
{
// Validate that src is valid absolute path
Path srcPath = new Path(src);
if (!srcPath.IsAbsoluteAndSchemeAuthorityNull())
{
throw new IOException("ViewFs:Non absolute mount name in config:" + src);
}
string[] srcPaths = BreakIntoPathComponents(src);
InodeTree.INodeDir <T> curInode = root;
int i;
// Ignore first initial slash, process all except last component
for (i = 1; i < srcPaths.Length - 1; i++)
{
string iPath = srcPaths[i];
InodeTree.INode <T> nextInode = curInode.ResolveInternal(iPath);
if (nextInode == null)
{
InodeTree.INodeDir <T> newDir = curInode.AddDir(iPath, aUgi);
newDir.InodeDirFs = GetTargetFileSystem(newDir);
nextInode = newDir;
}
if (nextInode is InodeTree.INodeLink)
{
// Error - expected a dir but got a link
throw new FileAlreadyExistsException("Path " + nextInode.fullPath + " already exists as link"
);
}
else
{
System.Diagnostics.Debug.Assert((nextInode is InodeTree.INodeDir));
curInode = (InodeTree.INodeDir <T>)nextInode;
}
}
// Now process the last component
// Add the link in 2 cases: does not exist or a link exists
string iPath_1 = srcPaths[i];
// last component
if (curInode.ResolveInternal(iPath_1) != null)
{
// directory/link already exists
StringBuilder strB = new StringBuilder(srcPaths[0]);
for (int j = 1; j <= i; ++j)
{
strB.Append('/').Append(srcPaths[j]);
}
throw new FileAlreadyExistsException("Path " + strB + " already exists as dir; cannot create link here"
);
}
InodeTree.INodeLink <T> newLink;
string fullPath = curInode.fullPath + (curInode == root ? string.Empty : "/") + iPath_1;
if (isLinkMerge)
{
// Target is list of URIs
string[] targetsList = StringUtils.GetStrings(target);
URI[] targetsListURI = new URI[targetsList.Length];
int k = 0;
foreach (string itarget in targetsList)
{
targetsListURI[k++] = new URI(itarget);
}
newLink = new InodeTree.INodeLink <T>(fullPath, aUgi, GetTargetFileSystem(targetsListURI
), targetsListURI);
}
else
{
newLink = new InodeTree.INodeLink <T>(fullPath, aUgi, GetTargetFileSystem(new URI(
target)), new URI(target));
}
curInode.AddLink(iPath_1, newLink);
mountPoints.AddItem(new InodeTree.MountPoint <T>(src, newLink));
}
