Kotlin Properties and the Vaadin 8 Beanbinder [Code Snippet]
Kotlin Properties and the Vaadin 8 Beanbinder [Code Snippet]
The Vaadin 8 beta is taking some lessons from Java 8's implementation of lambda expressions. But whereas Java doesn't recognize properties, Kotlin can help bind beans.
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Vaadin 8 (currently in beta) comes with a whole new DataBinding API that makes heavy use of Java 8 lambda features.
Unfortunately, Java has no concept of a Property, so one of the new ways to bind a Bean Property is writing something like ( taken from the documentation):binder.bind(nameField, Person::getName, Person::setName);Since Kotlin has a concept for a property, you may want to write something like:
binder.forField(nameField)
.bind(Person::name)That's possible with an extension method for the Vaadin Binder that could probably look like this:
fun <BEAN, T> Binder.BindingBuilder<BEAN, T>.bind(prop: KMutableProperty<T>) {
this.bind(
ValueProvider { bean: BEAN -> prop.getter.call(bean) },
Setter { bean: BEAN, v: T -> prop.setter.call(bean, v) })
}Have fun with Kotlin and Vaadin!
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