public interface Node<T extends Node>
The base interface for virtually all graphql language elements
NOTE: This class implements Serializable and hence it can be serialised and placed into a distributed cache. However we
are not aiming to provide long term compatibility and do not intend for you to place this serialised data into permanent storage,
with times frames that cross graphql-java versions. While we don't change things unnecessarily, we may inadvertently break
the serialised compatibility across versions.
Double-dispatch entry point.
A node receives a Visitor instance and then calls a method on a Visitor
that corresponds to a actual type of this Node. This binding however happens
at the compile time and therefore it allows to save on rather expensive
reflection based instanceOf check when decision based on the actual
type of Node is needed, which happens redundantly during traversing AST.
Additional advantage of this pattern is to decouple tree traversal mechanism
from the code that needs to be executed when traversal "visits" a particular Node
in the tree. This leads to a better code re-usability and maintainability.
context - TraverserContext bound to this Node object
visitor - Visitor instance that performs actual processing on the Nodes(s)
Result of Visitor's operation.
Note! Visitor's operation might return special results to control traversal process.