Examples with IComponentInheritedModel org.apache.wicket.model.IComponentInheritedModel used on opensource projects

Example 1 with IComponentInheritedModel

use of org.apache.wicket.model.IComponentInheritedModel in project wicket by apache.

the class Component method initModel.

/**
 * Called when a null model is about to be retrieved in order to allow a subclass to provide an
 * initial model.
 * <p>
 * By default this implementation looks components in the parent chain owning a
 * {@link IComponentInheritedModel} to provide a model for this component via
 * {@link IComponentInheritedModel#wrapOnInheritance(Component)}.
 * <p>
 * For example a {@link FormComponent} has the opportunity to instantiate a model on the fly
 * using its {@code id} and the containing {@link Form}'s model, if the form holds a
 * {@link CompoundPropertyModel}.
 *
 * @return The model
 */
protected IModel<?> initModel() {
    IModel<?> foundModel = null;
    // Search parents for IComponentInheritedModel (i.e. CompoundPropertyModel)
    for (Component current = getParent(); current != null; current = current.getParent()) {
        // Get model
        // Don't call the getModel() that could initialize many in between
        // completely useless models.
        // IModel model = current.getDefaultModel();
        IModel<?> model = current.getModelImpl();
        if (model instanceof IWrapModel && !(model instanceof IComponentInheritedModel)) {
            model = ((IWrapModel<?>) model).getWrappedModel();
        }
        if (model instanceof IComponentInheritedModel) {
            // return the shared inherited
            foundModel = ((IComponentInheritedModel<?>) model).wrapOnInheritance(this);
            setFlag(FLAG_INHERITABLE_MODEL, true);
            break;
        }
    }
    // No model for this component!
    return foundModel;
}