How to use

findDescendant

method

in

org.opensingular.form.SIComposite

/**
 * Find a child by the name ({@link SType#getName()})
 * @param parent the parent instance
 * @param childName the complete name of the child {@link SType#getName()}
 * @return the chield
 */
public static Optional<? extends SInstance> findChildByName(@Nonnull SInstance parent, @Nonnull String childName) {
  if(parent instanceof SIComposite) {
    SType<?> sType = parent.getDictionary().getType(childName);
    return ((SIComposite)parent).findDescendant(sType);
  }
  return Optional.empty();
}

/**
 * property column isolado em outro método para isolar o escopo de
 * serialização do lambda do appendPropertyColumn
 */
private void propertyColumnAppender(BSDataTableBuilder<SInstance, ?, ?> builder,
                  IModel<String> labelModel, IModel<String> sTypeNameModel,
                  IFunction<SInstance, String> displayValueFunction) {
  builder.appendPropertyColumn(labelModel, o -> {
    SIComposite composto = (SIComposite) o;
    SType<?> mtipo = composto.getDictionary().getType(sTypeNameModel.getObject());
    SInstance instancia = composto.findDescendant(mtipo).get();
    return displayValueFunction.apply(instancia);
  });
}

/**
 * property column isolado em outro método para isolar o escopo de
 * serialização do lambda do appendPropertyColumn
 */
private void propertyColumnAppender(BSDataTableBuilder<SInstance, ?, ?> builder,
  IModel<String> labelModel, IModel<String> sTypeNameModel,
  IFunction<SInstance, String> displayValueFunction) {
  builder.appendPropertyColumn(labelModel, o -> {
    SIComposite composite = (SIComposite) o;
    SType<?> type = composite.getDictionary().getType(sTypeNameModel.getObject());
    SInstance instance = composite.findDescendant(type).get();
    return displayValueFunction.apply(instance);
  });
}

  return Optional.of((TI) rootInstance);
} else if (rootInstance instanceof SIComposite) {
  return ((SIComposite) rootInstance).findDescendant(targetType);

  return (SInstance) composto.findDescendant(sType).orElse(null);
};
IFunction<SInstance, Object> propertyFunction = o -> displayValueFunction.apply(toInstance.apply((SIComposite) o));