Move "toString" implementations into visitor pattern.
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Key: OGNL-27
URL: https://issues.apache.org/jira/browse/OGNL-27
Project: OGNL
Issue Type: New Feature
Reporter: Daniel Pitts
Using the Visitor pattern allows for a cleaner implementation of toString().
I have a patch which will remove toString() from all AST classes, and replace
it with a single toString() in "SimpleNode" which delegates to a
ToStringVisitor to build the String efficiently.
This patch can also be used as an example of how to move other business logic
out of the AST classes into their own visitor classes.
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