Original FQDN of anonymous class

I want to store properties in a Map by their class, i.e. the map should contain only one object of any runtime type. There already is a current implementation (it is an existing project), and the mechanism is implemented with a Map<String, Object>.

Current implementation:

import com.foo.IConfiguration;
public class ClientCode {
    private Options options = new Options();
    public void putMethod() {
        options.subOptions(new IConfiguration() {
            public void configure() {}
        });
    }

    public Object getMethod() {
        return options.getSubOption(IConfiguration.class);
    }
}
public class Options {
    private Map<String, Object> map = new HashMap<>();

    public void subOptions(Object subOptionsValue) {
        if (subOptionsValue != null) {
            map.put(subOptionsValue.getClass().getName(), subOptionsValue);
        }
    }
    public Object getSubOption(Class<?> subOptionsClass) {
        return subOptionsClass == null ? null : map.get(subOptionsClass.getName());
    }
}

However, this does not work as I want to for anonymous classes. In this case, getName() and related methods will put Options$1 or something similar, while I need it to put com.foo.IConfiguration so that I can use it reliably in my getMethod().

I have looked through the API for java.lang.Class, but I can't find anything that will point me back to the definition of com.foo.IConfiguration. Well, I can, but it's not foolproof: clazz.getInterfaces() gives an array of interfaces, which is good here, but I can also create a new Object() {} or a local class, or a regular public class.

So is there a decent way to retrieve unambiguously the FQDN of the interface or superclass of an anonymous class ?