/**
* Resolve to context named by 'name'. Returns true if at named context (i.e. 'name' is empty
* name). Returns false otherwise, and sets Continuation on parts of 'name' not yet resolved.
*/
protected boolean resolve_to_context(Name name, Continuation cont) throws NamingException {
String target = name.toString();
StringHeadTail ht = c_parseComponent(target, cont);
String tail = ht.getTail();
String head = ht.getHead();
if (debug > 0)
System.out.println("RESOLVE TO CONTEXT(" + target + ") = {" + head + ", " + tail + "}");
if (head == null) {
// something is wrong; no name at all
InvalidNameException e = new InvalidNameException();
throw cont.fillInException(e);
}
if (!isEmpty(head)) {
// if there is head is a non-empty name
// this means more resolution to be done
try {
Object headCtx = a_lookup(head, cont);
// System.out.println("answer " + headCtx);
if (headCtx != null) cont.setContinue(headCtx, head, this, (tail == null ? "" : tail));
else if (cont.isContinue()) cont.appendRemainingComponent(tail);
} catch (NamingException e) {
e.appendRemainingComponent(tail);
throw e;
}
} else {
cont.setSuccess(); // clear
return true;
}
return false;
}
/**
* Resolves to penultimate context named by 'name'. Returns true if penultimate context has been
* reached (i.e. name only has one atomic component left). Returns false otherwise, and sets
* Continuation to parts of name not yet resolved.
*/
protected boolean resolve_to_penultimate_context(Name name, Continuation cont)
throws NamingException {
String target = name.toString();
if (debug > 0) System.out.println("RESOLVE TO PENULTIMATE" + target);
StringHeadTail ht = c_parseComponent(target, cont);
String tail = ht.getTail();
String head = ht.getHead();
if (head == null) {
// something is wrong; no name at all
InvalidNameException e = new InvalidNameException();
throw cont.fillInException(e);
}
if (!isEmpty(tail)) {
// more components; hence not at penultimate context yet
try {
Object headCtx = a_lookup(head, cont);
if (headCtx != null) cont.setContinue(headCtx, head, this, tail);
else if (cont.isContinue()) cont.appendRemainingComponent(tail);
} catch (NamingException e) {
e.appendRemainingComponent(tail);
throw e;
}
} else {
// already at penultimate context
cont.setSuccess(); // clear
return true;
}
return false;
}
/**
* This function is used when implementing a naming system that supports junctions. For example,
* when the a_bind_nns(name, newobj) method is invoked, that means the caller is attempting to
* bind the object 'newobj' to the nns of 'name'. For context that supports junctions, 'name'
* names a junction and is pointing to the root of another naming system, which in turn might have
* an nns. This means that a_bind_nns() should first resolve 'name' and attempt to continue the
* operation in the context named by 'name'. (i.e. bind to the nns of the context named by
* 'name'). If name is already empty, then throw NameNotFoundException because this context by
* default does not have any nns.
*/
protected void a_processJunction_nns(String name, Continuation cont) throws NamingException {
if (name.equals("")) {
NameNotFoundException e = new NameNotFoundException();
cont.setErrorNNS(this, name);
throw cont.fillInException(e);
}
try {
// lookup name to continue operation in nns
Object target = a_lookup(name, cont);
if (cont.isContinue()) cont.appendRemainingComponent(""); // add nns back
else {
cont.setContinueNNS(target, name, this);
}
} catch (NamingException e) {
e.appendRemainingComponent(""); // add nns back
throw e;
}
}
