My understanding is that Scala case classes with named parameters do not produce a builder pattern. Yes, they'll make it easy to construct an object within Scala, but this doesn't address the original problem, which is the need for a builder-like API so any JVM language could invoke it as such.
Alexey ________________________________ From: Ricky Clarkson <[email protected]> To: [email protected] Sent: Tue, October 12, 2010 3:46:54 PM Subject: Re: [The Java Posse] Re: Name Value Parameter Pattern Plugin for IDE Scala's case classes plus named arguments really solve this well, particularly if the calling code can be Scala too. case class Node(x: Float, y: Float) On Tue, Oct 12, 2010 at 8:42 PM, B Smith-Mannschott <[email protected]> wrote: > OK, so we've established that neither Eclipse nor Lombok will do what > the OP needs. Are there any other alternatives? > > I found myself needing something very similar only last week. In my > case, it was for a simple immutable value type (using Lombok's > lovely @Data) to which I wanted to add fluent builder style methods, > e.g.: > > @Data > class Node { > private final float x; > private final float y; > // Lombok generates getX(), getY(), but not setX(), setY() > // because x, y are final. > // Lombok generates Node(float x, float y) constructor > // since x and y are final. > Node withX(float x) { > return new Node(x, y); > } > Node withY(float y) { > return new Node(x, y); > } > } > > I ended up firing up emacs and defining a ad-hoc keyboard macro > to grind out the code for me. Yea! More boilerplate for the next > developer to wade through! huzzah! > > How difficult would it be for someone inexperienced with Lombok's > internals to add something like this? > > Stuff like this is why I'm glad there's more than just Java on the > JVM. For example, a Lisp (like Clojure) makes this kind of code > generation drudgery easy via its civilized [1] macro support. > > [1] where uncivilized == the C preprocessor. > > // Ben > > On Tue, Oct 12, 2010 at 18:27, Reinier Zwitserloot <[email protected]> wrote: >> project lombok can do this without cluttering up your code: >> http://projectlombok.org/ (disclaimer: I'm a lombok developer). It >> works in both eclipse and netbeans (and the command line). >> >> Eclipse has built in support to generate these (in the source menu, >> "generate getters/setters"). I'm fairly sure netbeans has something >> similar, no plugins required. They do actually stick text in your >> source files that you then have to maintain, though, unlike Lombok. >> >> As far as I know none of these generate the 'return this' style >> setter, because that style of setter does not adhere to the bean >> standard. >> >> On Oct 12, 5:22 pm, Peter A Pilgrim <[email protected]> wrote: >>> Hi Everyone >>> >>> May be even Tor can help. >>> >>> Has anyone come across a name value pattern plugin for NetBeans or >>> Eclipse IDE? >>> Given a class like this: >>> >>> class Node { >>> private float x; >>> private float y; >>> private float z; >>> >>> } >>> >>> The plugin generates the accessors and builder chain mutators >>> >>> class Node { >>> private float x; >>> private float y; >>> private float z; >>> >>> public float getX() { return x; } >>> public Node setX( float x ) { this.x = x; return this } >>> public float getY() { return x; } >>> public Node setY( float y ) { this.y = y; return this } >>> public float getZ() { return z; } >>> public Node setZ( float z ) { this.z = z; return this } >>> >>> } >>> >>> TIA >> >> -- >> You received this message because you are subscribed to the Google Groups >> "The >>Java Posse" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >>[email protected]. >> For more options, visit this group at >>http://groups.google.com/group/javaposse?hl=en. >> >> > > -- > You received this message because you are subscribed to the Google Groups > "The >Java Posse" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to >[email protected]. > For more options, visit this group at >http://groups.google.com/group/javaposse?hl=en. > > -- You received this message because you are subscribed to the Google Groups "The Java Posse" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/javaposse?hl=en. -- You received this message because you are subscribed to the Google Groups "The Java Posse" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/javaposse?hl=en.
