On Monday, 9 May 2016 16:55:59 UTC+1, Alex Miller wrote: > > Clojure is designed with enough extensibility to modify the printer and > reader to cover this case. > > You can define a custom print strategy for these types by extending the > print-dup multimethod. If you print it as a tagged literal, you can also > define a custom reader that can read it back as the appropriate type. Or > you can just happen to write it as a form that constructs a Java object if > that's possible. (I don't know the Joda classes well.) > > Print methods typically look like this: > > (defmethod print-dup org.joda.time.DateTime > [date-time ^java.io.Writer w] > (.write w (format "#org.joda.time.DateTime[%d]"))) > > That particular format should produce a string like > #org.joda.time.DateTime[1462809085214] which when read will call the > DateTime constructor with the long value. > > Or you could write your own custom tagged literal format and define and > install a reader for that tag that refers to a function that does whatever > you need. > > And I would recommend never using Java serialization in either Clojure or > Java. :) >
Fair enough, thanks. I looked for printer macros in the documentation but didn't find them; I didn't think of multimethods. Thanks again. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
