@Override
public void copy(URI fromURI, URI toURI) {
// TODO - Determine how copy should work. Currently copy and move are
// different. Copy works like an OS where "if destination exists, put
// it underneath. else name if for destination. IE cp a/b n would create
// just n... or if n already exists, then it would create n/b.
// I don't think FS2 needs this level of complexity. Move is implemented
// more simply, fast fail if destination exists.
// DEEP copy
boolean toRootPreExists = exists(toURI);
URI newRootURI = CoreFS2Utils.createCopiedURI(toRootPreExists, fromURI, toURI, fromURI);
// copy root
copySingleNode(fromURI, newRootURI);
// copy descendants (tree-walking order does not matter for memory
// implementation)
Set<URI> descendants = listDescendants(fromURI);
for (URI descendant : descendants) {
// there is some complexity determining the new location, based around
// whether the target pre-exists
URI descendantToURI =
CoreFS2Utils.createCopiedURI(toRootPreExists, fromURI, toURI, descendant);
copySingleNode(descendant, descendantToURI);
}
}
@Override
public FS2MetaSnapshot createObjectEntry(URI uri, String jsonMeta, InputStream payload) {
try {
FS2MetaSnapshot m = CoreFS2Utils.fromJSON(jsonMeta, FS2MetaSnapshotImpl.class);
MemoryMetadataImpl mem = new MemoryMetadataImpl(m);
FS2InMemoryObjectContainer c = new FS2InMemoryObjectContainer();
c.metadata = mem;
if (null != payload) {
c.payload = CoreFS2Utils.streamToBytes(payload);
}
objectResolver.put(uri, c);
return c.metadata;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public URI listParent(URI uri) {
URI parent = CoreFS2Utils.parseParentURI(uri);
// rather than simply parse, check for existence
try {
return objectResolver.get(parent).metadata.getURI();
} catch (Exception e) {
throw new RuntimeException("Unable to find parent.", e);
}
}
@Override
public Set<URI> listChilden(URI uri) {
// the length of this uri
int ulen = CoreFS2Utils.getPathAsArray(uri).length;
// remove descendants
Set<URI> children = new HashSet<URI>();
for (URI candidate : objectResolver.keySet()) {
if (!candidate.equals(uri) && candidate.toString().startsWith(uri.toString())) {
// also needs to be direct child
int clen = CoreFS2Utils.getPathAsArray(candidate).length;
if (clen == ulen + 1) {
children.add(candidate);
}
}
}
return children;
}
