guava/src/com/google/common/base/Suppliers.java
public static <T> Supplier<T> ofInstance(@Nullable T instance) {
    return new SupplierOfInstance<T>(instance);
  }
public static <T> Supplier<T> ofInstance(@Nullable T instance) {
    return new SupplierOfInstance<T>(instance);
  }
Returns a supplier that always supplies {@code instance}.