/// <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));
}
