SAX2 RFD: Inheritance vs. Modification vs. Amalgamation

Kay Michael Michael.Kay at
Wed May 19 18:32:21 BST 1999

I'd go for an amalgam of (1) and (3): define a new interface Parser2 that is
forwards-compatible from Parser but *doesn't* extend it. Give the supplier
the choice of implementing either or both interfaces (in the same or
different classes). The user decides which interface he's going to use and
selects a product that supplies it.

This makes it difficult to write a client application that will work
directly with either interface, but the availability of adapters (in both
directions) should mean this isn't a problem. The fact that Parser2 doesn't
extend Parser will ensure that the old Parser interface eventually falls
into disuse.

Mike Kay

> 1. Create a new interface, org.xml.sax.Parser2, that extends
>    org.xml.sax.Parser.
> 3. Create a separate interface org.xml.sax.ParserProps (or something
>    like that), and require SAX2 drivers to implement both interfaces.

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