public interface FileConfiguration
{
  [...snip...]

    File configurationDirectory();

    File dataDirectory();

    File temporaryDirectory();

    File cacheDirectory();

    File logDirectory();

}

To use it you simply need to use the FileConfigurationAssembler in your application assembly:

new FileConfigurationAssembler().assemble( module );

These will default to the platform settings, but can be overridden manually, either one-by-one or as a whole.

You can override defaults by adding org.qi4j.library.fileconfig.FileConfiguration_OS.properties files to your classpath where OS is one of win, mac or unix.

You can also override all properties definitions at assembly time by setting a FileConfigurationOverride object as meta info of this service:

FileConfigurationOverride override = new FileConfigurationOverride().
    withConfiguration( confDir ).
    withData( dataDir ).
    withTemporary( tempDir ).
    withCache( cacheDir ).
    withLog( logDir );
new FileConfigurationAssembler().withOverride( override ).assemble( module );

And finally, to get the FileConfiguration Service in your application code, simply use the following:

@Service FileConfiguration fileconfig;