RdfMapKey class

Designates a property as the key in a mapped Map<K,V> collection.

This annotation must be used together with @RdfMapEntry when mapping to a Dart Map. Within the item class specified by @RdfMapEntry, the property annotated with @RdfMapKey will be used as the key in the resulting Map. Unlike @RdfMapValue, this annotation must always be applied to a property, not a class.

This annotation is an essential part of the RDF Map mapping system, enabling the mapper to correctly serialize and deserialize complex data structures like Maps. Each map entry is serialized as a distinct resource in the RDF graph, with the annotated property serving as the key. This establishes the necessary key-value relationships between Dart Map types and their RDF graph representation.

Example:

@RdfProperty(VocabTerm.vectorClock)
@RdfMapEntry(VectorClockEntry) // Item class with key and value annotations
late Map<String, int> vectorClock;

// The item class that defines the structure of map entries:
@RdfLocalResource(IriTerm('http://example.org/vocab/VectorClockEntry'))
class VectorClockEntry {
  @RdfProperty(IriTerm('http://example.org/vocab/clientId'))
  @RdfMapKey() // This property becomes the map key
  final String clientId;

  @RdfProperty(IriTerm('http://example.org/vocab/clockValue'))
  @RdfMapValue() // This property becomes the map value
  final int clockValue;

  VectorClockEntry(this.clientId, this.clockValue);
}

Inheritance

• Object
• RdfAnnotation
• RdfMapKey

Constructors

RdfMapKey()

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

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