• From: Manos Batsis <manos_lists@g...>
• To: Michael Kay <mike@s...>, XML Developers List <xml-dev@l...>
• Date: Mon, 22 Sep 2008 10:10:02 +0300

Michael Kay wrote:
> Of course all problems in computing can be solved by adding a layer of
> indirection. You can design a wrapper object that implements the interface
> and delegates all the work to either an ArrayList or a LinkedList. This
> wrapper object is the only object to know about the implementation object so
> only one place has to change when the implementation changes. But it would
> be nice if this were built into the language, not something you have to
> program yourself. Apart from anything else, forwarding all the method
> invocations is expensive.


Just for the discussion (I've seen Saxon's code ;-), a more efficient 
method would be to only use the List interface and eliminate all 
implementation class references, including initial creation, using a 
"dynamic" Factory. That Factrory could offer, besides some initial 
configuration via property file or whatnot, a runtime method to change 
the implementation at runtime through a console etc.

Cheers,

Manos

• References:
  • Discover data patterns or Create data patterns?
    • From: "Costello, Roger L." <costello@m...>
  • RE: Discover data patterns or Create data patterns?
    • From: "Michael Kay" <mike@s...>
  • Re: Discover data patterns or Create data patterns?
    • From: Rick Jelliffe <rjelliffe@a...>
  • RE: Discover data patterns or Create data patterns?
    • From: "Michael Kay" <mike@s...>
  • Re: Discover data patterns or Create data patterns?
    • From: "Mukul Gandhi" <gandhi.mukul@g...>
  • RE: Instances changing their type [was:Discover data patterns or Create data patterns?]
    • From: "Michael Kay" <mike@s...>