private final Map activeScopes = new java.util.HashMap();
protected SelectorMatcher getActiveScope( IdentityConstraint c ) {
LightStack s = (LightStack)activeScopes.get(c);
if(s==null) return null;
if(s.size()==0) return null;
return (SelectorMatcher)s.top();
}
protected void pushActiveScope( IdentityConstraint c, SelectorMatcher matcher ) {
LightStack s = (LightStack)activeScopes.get(c);
if(s==null)
activeScopes.put(c,s=new LightStack());