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Re: Annotations processing + type introspection + code generation

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On Sep 12, 10:21 pm, Robert Klemme <shortcut...@googlemail.com> wrote:
> On 12.09.2011 20:00, Alex J wrote:
>
> > On Sep 12, 8:56 pm, Robert Klemme<shortcut...@googlemail.com>  wrote:
> >> [snip]
> >> Why do you want to generate code?  I mean, you could process annotations
> >> at runtime.  Create appropriate classes for the handling and configure
> >> appropriate graphs of objects which do the work (or even use reflection).
>
> > I need to generate *source* code, the boilerplate code is complex
> > enough, unfortunately bytecode is not an option.
>
> > One of the reason why I need generated code is that the boilerplate
> > code is quite sofisticated, learning generated docs and debugging the
> > generated code most likely will be required.
>
> > There are other reasons, but I think that this one would be
> > sufficient.
>
> Hm...  If you need to generate a lot identical code there is something
> wrong: that identical code could be better implemented directly and
> used.  So that leaves adapters and stuff Mark mentioned for generation.
>   I am not convinced yet that it is a good idea to generate loads of
> complex code.
>
> Can you shed some more light on the nature of the application you are
> going to implement?

Yes, that's a prototype of tool that helps to implement a part of code
for you.

You (as a user) define interface, the tool tries to guess what you
want based on the name patterns, references to domain objects, etc.

Say you have the following:

@Specification // tells tool "this interface is a subject to be
processed"
interface PersonDao {
 long savePerson(String name, int age);
 Person getPerson(long id);
 List<Long> getPersons();
}

interface Person {
  String getName();
  int getAge();
}

Then tool defines final class PersonDaoImpl and PersonImpl:

final class PersonDaoImpl implements PersonDao {
 private static final class PersonImpl extends JdbcDaoSupport
implements Person {
  private final String name;
  private final int age;

  PersonImpl(String name, int age) { this.name = name; this.age =
age; }

  @Override public String getName() { return name; }
  @Override public int getAge() { return age; }
 }

 @Override public long savePerson(String name, int age) {
   getJdbcTemplate().update("INSERT INTO person (name, age) VALUES
(?, ?)", name, age);
   return getJdbcTemplate.queryForInt("CALL identity()");
 }
 //.. etc.
}


This is not that simple as I gave above (as much more complex human-
friendly definitions might be involved), but this clearly describes
the idea.
I'm implementing this out of pure interest, as my hobby project :)

>
> Kind regards
>
>         robert
>
> --
> remember.guy do |as, often| as.you_can - without endhttp://blog.rubybestpractices.com/

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Thread

Annotations processing + type introspection + code generation Alex J <vstrength@gmail.com> - 2011-09-12 06:21 -0700
  Re: Annotations processing + type introspection + code generation Robert Klemme <shortcutter@googlemail.com> - 2011-09-12 18:56 +0200
    Re: Annotations processing + type introspection + code generation markspace <-@.> - 2011-09-12 10:04 -0700
      Re: Annotations processing + type introspection + code generation Robert Klemme <shortcutter@googlemail.com> - 2011-09-12 19:22 +0200
        Re: Annotations processing + type introspection + code generation Alex J <vstrength@gmail.com> - 2011-09-12 11:08 -0700
    Re: Annotations processing + type introspection + code generation Alex J <vstrength@gmail.com> - 2011-09-12 11:00 -0700
      Re: Annotations processing + type introspection + code generation Robert Klemme <shortcutter@googlemail.com> - 2011-09-12 20:21 +0200
        Re: Annotations processing + type introspection + code generation Alex J <vstrength@gmail.com> - 2011-09-12 15:06 -0700

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