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RE: String interning (WAS: SAX2/Java: Towards a final form)

  • From: "Clark C. Evans" <clark.evans@m...>
  • To: Tim Bray <tbray@t...>
  • Date: Thu, 13 Jan 2000 15:26:39 -0500 (EST)

java .intern
On Thu, 13 Jan 2000, Tim Bray wrote:
> Yes.   Given that *every* credible parser does this, and that it's
> a major convenience for programmers using the API to be able to compare
> strings with ==, there is at some level an argument that we ought to
> expose this fact.

There are going to be lots of server side filter
architectures using the SAX interface which may
not do this.  Indeed, I'd say that the "parser" 
interface is mis-named.  It's really an "emitter".
And I'd go so far to say that in a few years, 
99% of the "emitters" out there won't be parsers!

So, requiring the authors of those emitters
to be aware of Java "intern" is streaching it.
I think this is really a compiler optimization
issue and should not be part of the interface.
A java compiler could, for instance, take:

  lhs.equals(rhs)

and compile it as

  ( lhs == rhs | lhs.equals(rhs) )


Best,

Clark


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