1. There is a design pattern that does what you want it to do. It's called a (I think) facade. The idea is that you have a bunch of layers over an object that will trap calls to a method and validate whatever. Once that actual object's method is called, it can assume the input data is good.
  2. Java implements a concept of interfaces in the language. Perl does not. Perl allows you to implement interfaces yourself. You can do more with interfaces in Perl than Java, but you have to do all the work. (Or, you can delegate the work to a module.)
  3. Perl allows you to create any constructor class you want. And factories and base classes and whatever else you want. You just have to do it (or find a module to do it).
  4. XML is not a schema for storing anything. It is an eXtensible Markup Language. It is not a specification language, a storage language, or anything other than a markup language. Don't use XML for something it is not suited to do.

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We are the carpenters and bricklayers of the Information Age.

Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.

In reply to Re: Filter objects? by dragonchild
in thread Filter objects? by matth

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