A new implementation aproach for luxor

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Hello all.
The last 3 days I'm working on a new approach for the implementation of luxor.

Currently for each xml element a *Def objects is created and for most elements a 
*Peer object as well. I was thinking for a way to avoid this, since all this 
objects require memory and cup. During the design and implementation of the 
approach, it easy made obvious that more advantages exist then just reduction of 
cup and memory usage. I'd like to present the design of the approach hopping to 
get feedback from the luxor team.

The design utilizes code generation techniques as well as inheritance and 
polymorphisms.
 From a configuration file (see the attachment) the code generation system 
retrieves information about the supported tags and the properties and css 
attributes each tag supports. Based on this information an abstract class is 
generated which handles the tree walking of the XML document, and creates the 
appropriate components for each tag and reports errors if something goes wrong 
during the walk. The developer has to extend the class and implement the 
abstract methods declared in the generated class and override few methods if 
necessary. One obvious disadvantage of this approach is the fact that differs 
aloat from the current implementation. For this reason, the advantages should be 
very significant in order to adopt the new implementation model. I'll try to 
display the advantages of the approach and I hope in your feedback in order to 
decide if is worth it to adopt the new design. Let's mention that the existing 
code base will not be thrown away. The functionality provided by the existing 
classes should exist in the class which extends the generated class. The 
existing code will be moved (with some modifications if needed) in the code of 
the descendant class.

Advantages:
1)Less memory used. No intermediate objects are created during the component 
construction and initialization. No references are kept to the Element object 
from where the *Def object is created. The GC can free the memory the Element 
objects occupy.
2)Less cup used. The cup time spent on the *Def and *Peer objects initialization 
is saved. Also no runtime configuration is needed (in regard to the *Def object).
3)Reduction of code base. I executed the commands displayed  bellow and found 
that 82 *Def classes and 25 *Peer classes exist. The commands are:
locate -r .*Def.*.java | rep luxor | wc -l
     83
One of the *Def is LuxorDefaultVelocityContext.java and for this reason the sum 
is 82.
locate -r .*Peer.*.java | rep luxor | wc -l
     25
Also interfaces like *Resolver are most likely unneeded. More interfaces and 
classes like the NComponent various Factory classes and the Tag, 
AbstractComponent, AbstractContainer .. will not be needed any more. So the code 
base will be reduced by more then 107 classes. This
I believe will make it easier to mentain the code base.
4)Easier implementation. If you check the implementation of SwingXulManagerImpl 
you'll notice that the methods are generally short and simple. Of course not all 
the functionality required is provided since this is only a proof of concept. 
The great gain I believe is that a new developer should not have to learn a 
pretty complex and large object model in order to write code for further luxor 
improvement.
5)Easier porting to other toolkits. This I count as the greatest benefit. 
Recently I was looking to the java binding of wxWidgets toolkit (a cross 
platform toolkit implemented in C++). In order to implement a port to an other 
toolkit is not needed to duplicate the classes hierarchy which exist for the 
swing, but simply implement the abstract methods of the generated class. I 
estimate that the effort is far smaller.
6)Porting for other devices. This is a pure speculation because I have no 
experience with small devices like cellular phones and the like. However, if 
such a device can not support an XML parser due to the memory used by the object 
model it generates, by modifying the template used for the code generation 
system, a new implementation can be achieved which does not use xml for the gui 
description, but a less memory demanding way. I recall there are other ways to 
describe the GUI already (this was a post I red once but can't recall more 
details). I didn't look at the implementation of those alternative ways of  GUI 
description but I speculate that a Document object was created from that 
description and fed to luxor. Anyway, if the new approach achieves high 
reduction of memory usage, we could hope to see luxor on those devices as well.
7)This is not really an advantage, but in order to add a new tag to luxor is 
needed to modify the config.xml file (this should be easy), regenerate the base 
class and if needed add some methods in the class which extends the generated 
one. The effort needed should be equivalent (if not less) to the effort required 
for the same task in the existing design.
8)Some tasks which could be achieved using Aspect programming or other 
techniques can now be achieved by modifying the template the code generation 
system uses. For example, if we wanted a LOG message whenever a new Element is 
inspected we could modify the template.
9)The code generation system could be used for other tasks, like automatic dtd 
generation.

Well this is all the advantages I  could think of. Please have a look at the 
config.xml file and the SwingXulManager* files.

One last comment. The code generation system produces methods like 
setHeight(JComponent comp, int value) and the like. If the setHeight method 
should be implemented differently for descendants of JComponent, you could 
provide a method setHeight(JComponentDecendant comp, int value) and this method 
will be called if the argument to the setHeight method is a JComponentDecendant 
due to polymorphisms.


I'm looking forward for your comments.

Anakreon.

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