[antlr-interest] On trees and JavaBeans, part 2: tree creation

[Micheal J]

Assuming no ones chimes in with performance issues relating to the
TreeModel-style interface.

> 1) Have an ASTModel interface that defines the node 
> navigation and necessary data access against Objects

+1

> 2) Define an ASTFactory interface that creates and 
> manipulates just Objects

I suspect the ASTFactory interface also needs to accommodate the Payload
since this objects originate in (i.e. are created in) the lexer -
Token==Payload==TreeNode right?. The ASTModel only replaces Carriers.

+1

> 3) Define AST interface that represents an ANTLR AST node

Done.

> 4) Define a default implementation of ASTModel that 
> translates model calls into AST node calls

+1

> 5) Define default implementation(s) of AST as needed by ANTLR

Done.

> 6) Define default implementation(s) of ASTFactory as needed by ANTLR

+1

> After that, anyone can use any AST they would like, not just 
> at the node level.
> 
> Nifty, eh?

Barring performance issues, yes.

Cheers,

Micheal