Associate a property with a parse tree node. Useful with parse tree listeners that need to associate values with particular tree nodes, kind of like specifying a return value for the listener event method that visited a particular node. Example:
ParseTreeProperty<Integer> values = new ParseTreeProperty<Integer>(); values.put(tree, 36); int x = values.get(tree); values.removeFrom(tree);
You would make one decl (values here) in the listener and use lots of times in your event methods.
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