DefaultValue class

The value a constructor parameter of a @ConfigurationProperties class takes when its property is not set.

It is written as a property value would be, so it is converted the same way: @DefaultValue('10s') for a Duration. Use a String for a single value and a List<String> for a collection. Without an argument it gives an empty collection, or a nested object created with its own defaults rather than null. A Dart default value ({this.port = 8080}) does the same for values that can be const.

@ConfigurationProperties('app')
class AppProperties {
  AppProperties(
    @DefaultValue('8080') this.port,
    @DefaultValue(['a', 'b']) this.hosts,
    @DefaultValue() this.pool,
  );
  final int port;
  final List<String> hosts;
  final Pool pool;
}

Spring (Java):

public record AppProperties(@DefaultValue("8080") int port,
    @DefaultValue({"a", "b"}) List<String> hosts,
    @DefaultValue Pool pool) {}

Constructors

DefaultValue([Object value = const <String>[]])

A default of value: a String, a List<String>, or nothing for an empty collection or a nested object with its own defaults.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

value → Object

The default as written: a String or a List<String>, converted to the parameter's type like a property value.

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited