Java Preferences

[jaj_developer]

All,

Currently I am using Java Preferences to store preferences to the
default location (on windows the registry).

The issue is that some users will move from machine to machine and in
some cases the registry is locked down.

So the question is : Is there any easy way of altering the way Java
Preferences are stored (e.g. xml flat file, csv etc..) or do you have
to cut some code (e.g. impliment your own PreferencesFactory)??

Ta

Jaj

 

[Roedy Green]

So the question is : Is there any easy way of altering the way Java
Preferences are stored (e.g. xml flat file, csv etc..) or do you have
to cut some code (e.g. impliment your own PreferencesFactory)??

What you might do is suck the preferences out for backup and dump them
in a platform independent format. XML should do, or perhaps a
serialised tree.

I don't think you have any control how the system preferences are
implemented.

 

[jaj_developer]

Roedy,

Yeah that's what I thought. I think that I will have to implement my
own version of the PreferenceFactory and the AbstractPreferences.

*sigh*

Jaj

 

[jaj_developer]

Does anyone know of a good tutorial (or any tutorial) or any GPL code
that I can look at to show me how to do my own Factory ???

Ta

Jaj

 

[Roedy Green]

Yeah that's what I thought. I think that I will have to implement my
own version of the PreferenceFactory and the AbstractPreferences.

Since you are tossing Sun's preference mechanism aside, you could just
do this with a class with a static get and save method where you
specify the full node name on each get/save.

Another thought is JDK 1.5 Preferences has an xml import/export built
in.

If you want to replace the official preferences here is what to do:

Write yourself a JAIPreferences class that extends the abstract
Preferences class.

Then write a class that implements the PreferencesFactory interface.
basically all it does is return new JAIPreferences().

If the system property java.util.prefs.PreferencesFactory is defined,
then it is taken to be the fully-qualified name of a class
implementing the PreferencesFactory interface.

there is another method of registering your factory with a magic jar
entry described under Preferences.

 

[jaj_developer]

Roedy,

Thanks for your wise words....

Have implemented a system based upon the info above

Ta

Jaj