This local transform adds a logging ability to your program using
Log4j logging. Every method call on a unbound variable named
log
will be mapped to a call to the logger. For this a
log field will be
inserted in the class. If the field already exists the usage of this transform
will cause a compilation error. The method name will be used to determine
what to call on the logger.
log.name(exp)
is mapped to
if (log.isNameEnabled() {
log.name(exp)
}
Here name is a place holder for info, debug, warning, error, etc.
If the expression exp is a constant or only a variable access the method call will
not be transformed. But this will still cause a call on the injected logger.