toJson method
Returns a JSON presentation of the object.
Implementation
@override
Map<String, Object> toJson() {
var result = <String, Object>{};
result['source'] = source.toJson();
var kind = this.kind;
if (kind != null) {
result['kind'] = kind;
}
var target = this.target;
if (target != null) {
result['target'] = target.toJson();
}
result['fact'] = fact;
var value = this.value;
if (value != null) {
result['value'] = value;
}
return result;
}