code: public void addConverter(Class<?> fromClass, String syntax, Class<?> toClass, Converter converter) {
          converters.put(makeConverterKey(fromClass, syntax, toClass), converter);
      }
docs: Add a {@link Converter} to this <code>ConverterManager</code>.
  
  @param fromClass The class the <code>Converter</code> should be used to convert from.
  @param syntax The LDAP syntax that the <code>Converter</code> should be used for.
  @param toClass The class the <code>Converter</code> should be used to convert to.
  @param converter The <code>Converter</code> to add.