An object that can render other objects of a particular type into plain-text form. Allows decoupling that is useful for a dependency-injection architecture.

@param <T> the type to render

abstract class Renderer<T> {

 /**
  * Renders {@code object} as plain text. Should never throw any exceptions!
  */
 String render(T object);

 /**
  * Renders {@code object} as plain text, appended directly to {@code
  * appendable}. Should never throw any exceptions except if {@code appendable}
  * throws an {@code IOException}.
  */
 void renderTo(T object, Appendable appendable);
}