//
// This function is the recursive search of groups for this
// implementation of the Group. The search proceeds building up
// a vector of already seen groups. Only new groups are considered,
// thereby avoiding loops.
//
boolean isMemberRecurse(Principal member, Vector<Group> alreadySeen) {
Enumeration<? extends Principal> e = members();
while (e.hasMoreElements()) {
boolean mem = false;
Principal p = (Principal) e.nextElement();
// if the member is in this collection, return true
if (p.equals(member)) {
return true;
} else if (p instanceof GroupImpl) {
//
// if not recurse if the group has not been checked already.
// Can call method in this package only if the object is an
// instance of this class. Otherwise call the method defined
// in the interface. (This can lead to a loop if a mixture of
// implementations form a loop, but we live with this improbable
// case rather than clutter the interface by forcing the
// implementation of this method.)
//
GroupImpl g = (GroupImpl) p;
alreadySeen.addElement(this);
if (!alreadySeen.contains(g)) mem = g.isMemberRecurse(member, alreadySeen);
} else if (p instanceof Group) {
Group g = (Group) p;
if (!alreadySeen.contains(g)) mem = g.isMember(member);
}
if (mem) return mem;
}
return false;
}
/**
* This function returns true if the group passed matches the group represented in this interface.
*
* @param another The group to compare this group to.
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof Group == false) {
return false;
}
Group another = (Group) obj;
return group.equals(another.toString());
}