Support Forums: Message List - Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Sun, 26 May 2013 05:42:53 -0400 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 I think a more elegant solution, than having to define a class for each stage, involves using interfaces.
In essence your builder class should implement various interfaces (one for each stage), and instead of merely returning the builder...]]> Wed, 23 Apr 2008 04:26:10 -0400 Wed, 23 Apr 2008 04:26:10 -0400 Wed, 23 Apr 2008 04:26:10 -0400 Apr 23, 2008 Jevgeni Kabanov 0 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 Wed, 23 Apr 2008 02:35:43 -0400 Wed, 23 Apr 2008 02:35:43 -0400 Wed, 23 Apr 2008 02:35:43 -0400 Apr 23, 2008 Gregory Vandenbroucke 1 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095
closures: same as higher order functions

There's a distinction. Closures refers first of all to scope binding.
...]]> Mon, 21 Apr 2008 18:05:01 -0400 Mon, 21 Apr 2008 18:05:01 -0400 Mon, 21 Apr 2008 18:05:01 -0400 Apr 21, 2008 Jesper Nordenberg 0 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 closures: same as higher order functions...]]> Mon, 21 Apr 2008 11:27:32 -0400 Mon, 21 Apr 2008 11:27:32 -0400 Mon, 21 Apr 2008 11:27:32 -0400 Apr 21, 2008 Jevgeni Kabanov 1 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095
Actually I don't think that in this particular case you can get much more readable in Scala or Haskell. And the things you mentioned are not actually that important, what makes functional DSLs so powerful and what I'm sorely missing is...]]> Mon, 21 Apr 2008 08:04:22 -0400 Mon, 21 Apr 2008 08:04:22 -0400 Mon, 21 Apr 2008 08:04:22 -0400 Apr 21, 2008 Jesper Nordenberg 2 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 Yes, it's as powerful as what you can build in Scala, but until Java gets closures, type inference, case classes, pattern matching, implicits, operator overloading, for comprehensions etc. it's not nearly as readable as it would be in Scala....]]> Mon, 21 Apr 2008 06:01:38 -0400 Mon, 21 Apr 2008 06:01:38 -0400 Mon, 21 Apr 2008 06:01:38 -0400 Apr 21, 2008 Jevgeni Kabanov 3 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 Mon, 21 Apr 2008 03:49:53 -0400 Mon, 21 Apr 2008 03:49:53 -0400 Mon, 21 Apr 2008 03:49:53 -0400 Apr 21, 2008 Jesper Nordenberg 4 Re: Like Linq http://www.theserverside.com/discussions/thread.tss?thread_id=49095 https://bean-properties.dev.java.net/orm.html]]> Sun, 20 Apr 2008 19:43:02 -0400 Sun, 20 Apr 2008 19:43:02 -0400 Sun, 20 Apr 2008 19:43:02 -0400 Apr 20, 2008 Rodolfo de Paula 0 Re: Like Linq http://www.theserverside.com/discussions/thread.tss?thread_id=49095 This example is amazingly like Microsoft's Linq in C# 3.0, which is a very elegant way to incorporate querying capabilities into C#. Is this something that can be done...]]> Sun, 20 Apr 2008 13:36:13 -0400 Sun, 20 Apr 2008 13:36:13 -0400 Sun, 20 Apr 2008 13:36:13 -0400 Apr 20, 2008 Jevgeni Kabanov 1 Like Linq http://www.theserverside.com/discussions/thread.tss?thread_id=49095 Microsoft's Linq in C# 3.0, which is a very elegant way to incorporate querying capabilities into C#....]]> Sun, 20 Apr 2008 10:41:31 -0400 Sun, 20 Apr 2008 10:41:31 -0400 Sun, 20 Apr 2008 10:41:31 -0400 Apr 20, 2008 Andrew Eisenberg 2 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 In theory this is tempting, in practice this is ridiculously tedious, especially with today's tools. The simple example though demonstrates the ability to accomplish that, doesn't expose the difficulties....]]> Sat, 19 Apr 2008 15:01:49 -0400 Sat, 19 Apr 2008 15:01:49 -0400 Sat, 19 Apr 2008 15:01:49 -0400 Apr 19, 2008 Jevgeni Kabanov 0 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 I think a better example would be this:
Person p = new PersonBuilder().setFirstName("Jean-Claude").setHair(Hair.BROWN).setHair(Hair.GREY);
The trick is to stage building
class PersonBuilder {
public PersonHairBuilder...]]> Sat, 19 Apr 2008 13:36:12 -0400 Sat, 19 Apr 2008 13:36:12 -0400 Sat, 19 Apr 2008 13:36:12 -0400 Apr 19, 2008 Ilya Sterin 1 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 It seems to me that the only way to know that setHair() is no longer valid is to run code inside that object, which therefore needs to be compiled....]]> Fri, 18 Apr 2008 18:53:25 -0400 Fri, 18 Apr 2008 18:53:25 -0400 Fri, 18 Apr 2008 18:53:25 -0400 Apr 18, 2008 Jevgeni Kabanov 4 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 p=new Person().setFirstName("Jean-Claude").setHair(Hair.BROWN).setHair(Hair.GREY);In this case, you can see where setting the hair color is done twice, which Jevgeni addresses by saying:
The type you return from your DSL method...]]> Fri, 18 Apr 2008 18:20:02 -0400 Fri, 18 Apr 2008 18:20:02 -0400 Fri, 18 Apr 2008 18:20:02 -0400 Apr 18, 2008 Cedric Beust 5 Re: Typesafe DSLs in Java: Part 1 — Typesafe Bytecode http://www.theserverside.com/discussions/thread.tss?thread_id=49095 Fri, 18 Apr 2008 15:30:21 -0400 Fri, 18 Apr 2008 15:30:21 -0400 Fri, 18 Apr 2008 15:30:21 -0400 Apr 18, 2008 Jevgeni Kabanov 3