/**
* Returns the type of an element when that element is viewed as a member of, or otherwise
* directly contained by, a given type. For example, when viewed as a member of the parameterized
* type {@code Set<String>}, the {@code Set.add} method is an {@code ExecutableType} whose
* parameter is of type {@code String}.
*
* @param containing the containing type
* @param element the element
* @return the type of the element as viewed from the containing type
* @throws IllegalArgumentException if the element is not a valid one for the given type
*/
public TypeMirror asMemberOf(DeclaredType containing, Element element) {
Type site = (Type) containing;
Symbol sym = (Symbol) element;
if (types.asSuper(site, sym.getEnclosingElement()) == null)
throw new IllegalArgumentException(sym + "@" + site);
return types.memberType(site, sym);
}
