constructReference method
Creates a new DataRefererence
that indexes even deeper than this one.
For example, suppose a widget's arguments consisted of a map with one key,
"a", whose value was a DataRefererence
referencing "data.foo.bar". Now
suppose that the widget itself has an ArgsReference that references
"args.a.baz". The "args.a" part identifies the aforementioned
DataReference, and so the resulting reference is actually to
"data.foo.bar.baz".
In this example, the DataReference to "data.foo.bar" would have its
constructReference method invoked by the runtime, with ["baz"]
as the
moreParts
argument, so that the resulting DataReference's parts is a
combination of the original's (["foo", "bar"]
) and the additional parts
provided to the method.
Implementation
DataReference constructReference(List<Object> moreParts) {
return DataReference(parts + moreParts);
}