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.
Join the DZone community and get the full member experience.
Join For FreeVerify, standardize, and correct the Big 4 + more– name, email, phone and global addresses – try our Data Quality APIs now at Melissa Developer Portal!
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!
Developers! Quickly and easily gain access to the tools and information you need! Explore, test and combine our data quality APIs at Melissa Developer Portal – home to tools that save time and boost revenue.
Like This Article? Read More From DZone
Published at DZone with permission of Thomas Kratz , DZone MVB. See the original article here.
Opinions expressed by DZone contributors are their own.
{{ parent.title || parent.header.title}}
{{ parent.tldr }}
{{ parent.linkDescription }}
{{ parent.urlSource.name }}