org.argeo.api/src/org/argeo/api/MvcProvider.java

   1 package org.argeo.api;
   2
   3 import java.util.function.BiFunction;
   4
   5 /**
   6  * Stateless UI part creator. Takes a parent view (V) and a model context (M) in
   7  * order to create a view part (W) which can then be further configured. Such
   8  * object can be used as services and reference other part of the model which
   9  * are relevant for all created UI part.
  10  */
  11 @FunctionalInterface
  12 public interface MvcProvider<V, M, W> extends BiFunction<V, M, W> {
  13         /**
  14          * Whether this parent view is supported.
  15          *
  16          * @return true by default.
  17          */
  18         default boolean isViewSupported(V parent) {
  19                 return true;
  20         }
  21
  22         /**
  23          * Whether this context is supported.
  24          *
  25          * @return true by default.
  26          */
  27         default boolean isModelSupported(M context) {
  28                 return true;
  29         }
  30
  31         default W createUiPart(V parent, M context) {
  32                 if (!isViewSupported(parent))
  33                         throw new IllegalArgumentException("Parent view " + parent + "is not supported.");
  34                 if (!isModelSupported(context))
  35                         throw new IllegalArgumentException("Model context " + context + "is not supported.");
  36                 return apply(parent, context);
  37         }
  38 }