ThreadGroupReferenceImpl(VirtualMachine aVm,
    Oop oRef) 
{
        super(aVm, oRef);
}

 protected String description() 
{
        return "ThreadGroupReference " + uniqueID();
}

 public String name() 
{
        return OopUtilities.threadGroupOopGetName(ref());
}

 public ThreadGroupReference parent() 
{
        return (ThreadGroupReferenceImpl)vm.threadGroupMirror(
               (Instance)OopUtilities.threadGroupOopGetParent(ref()));
}

 public  void resume() 
{
        vm.throwNotReadOnlyException("ThreadGroupReference.resume()");
}

 public  void suspend() 
{
        vm.throwNotReadOnlyException("ThreadGroupReference.suspend()");
}

 public List threadGroups() 
{
        Oop[] myGroups = OopUtilities.threadGroupOopGetGroups(ref());
        ArrayList myList = new ArrayList(myGroups.length);
        for (int ii = 0; ii <  myGroups.length; ii++) {
            ThreadGroupReferenceImpl xx = (ThreadGroupReferenceImpl)vm.threadGroupMirror(
                                          (Instance)myGroups[ii]);
            myList.add(xx);
        }
        return myList;
}

 public List threads() 
{
        // Each element of this array is the Oop for a thread;
        // NOTE it is not the JavaThread that we need to create
        // a ThreadReferenceImpl.
        Oop[] myThreads = OopUtilities.threadGroupOopGetThreads(ref());
        ArrayList myList = new ArrayList(myThreads.length);
        for (int ii = 0; ii <  myThreads.length; ii++) {
            JavaThread jt = OopUtilities.threadOopGetJavaThread(myThreads[ii]);
            if (jt != null) {
                ThreadReferenceImpl xx = (ThreadReferenceImpl)vm.threadMirror(jt);
                myList.add(xx);
            }
        }
        return myList;
}

 public String toString() 
{
        return "instance of " + referenceType().name() +
               "(name='" + name() + "', " + "id=" + uniqueID() + ")";
}