| package freemarker.template; |
| |
| /** |
| * A {@link TemplateModel} that can be unwrapped and then it considers a provided desired (hint) class. This is |
| * useful when multiple languages has to communicate with each other through FreeMarker. For example, if we have a |
| * model that wraps a Jython object, then we have to unwrap that differently when we pass it to plain Java method and |
| * when we pass it to a Jython method. |
| * |
| * <p>This is rarely implemented by applications. It is typically implemented by the model classes belonging to |
| * {@link ObjectWrapper}-s. |
| * |
| * @author Attila Szegedi |
| */ |
| public interface AdapterTemplateModel extends TemplateModel { |
| /** |
| * Retrieves the underlying object, or some other object semantically |
| * equivalent to its value narrowed by the class hint. |
| * @param hint the desired class of the returned value. An implementation |
| * should make reasonable effort to retrieve an object of the requested |
| * class, but if that is impossible, it must at least return the underlying |
| * object as-is. As a minimal requirement, an implementation must always |
| * return the exact underlying object when |
| * <tt>hint.isInstance(underlyingObject)</tt> holds. When called |
| * with <tt>java.lang.Object.class</tt>, it should return a generic Java |
| * object (i.e. if the model is wrapping a scripting language object that is |
| * further wrapping a Java object, the deepest underlying Java object should |
| * be returned). |
| * @return the underlying object, or its value accommodated for the hint |
| * class. |
| */ |
| public Object getAdaptedObject(Class hint); |
| } |