Package org.apache.juneau.commons.settings

Interface FunctionalPropertySource

All Superinterfaces:

PropertySource

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface FunctionalPropertySource
extends PropertySource

A functional interface for creating read-only PropertySource instances from a function.

Method Summary

Modifier and Type	Method	Description
PropertyLookupResult	get(String name)	Returns a property in this property source.
static FunctionalPropertySource	of(UnaryOperator<String> function)	Creates a functional source from a function that returns a string.

Method Details

get

PropertyLookupResult get(String name)

Description copied from interface: PropertySource

Returns a property in this property source.

Specified by:

get in interface PropertySource

Parameters:

name - The property name.

Returns:

The property lookup result:

• PropertyLookupResult.missing() if this source does not define the key.
• PropertyLookupResult.present(Optional) with Optional.empty() if the key exists with a null value.
• PropertyLookupResult.present(Optional) with a value if the key exists with a non-null value.

of

static FunctionalPropertySource of(UnaryOperator<String> function)

Creates a functional source from a function that returns a string.

Parameters:

function - The function to delegate property lookups to. Must not be null.

Returns:

A new functional property source instance.