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All the Perl that's Practical to Extract and Report

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  • Style 3 is Java interfaces. I loved the concept when I first heard about them, but apparently most older books don't focus on them. (Apparently Java, like Perl, has a huge backlog of obsolete information, advice, and books floating around out there.) I guess interfaces made it into SAX via Java.

    Basically, an interface is like a virtual class, except there's no inheritance involved. Interfaces can be used to give you the benefits of multiple inheritance without actually allowing such. For example, to

    --
    J. David works really hard, has a passion for writing good software, and knows many of the world's best Perl programmers
    • Yes, that's very close to the idea. And in fact, there's a growing number of classes that implement the SAX interface while not having SAX as their central focus. They just want to be usable as SAX handlers to build their internal structure.

      The way we did it is however slightly different as you are not forced to implement anything of the interface. In fact, you could provide any object as a SAX handler and it will still work, even if it implements none of the interface (quite simply, nothing will happen). This is quite useful because most of the time you don't care about the entire set of events that can occur in an XML document.

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      -- Robin Berjon [berjon.com]