[stringtemplate-interest] StringTemplate + Doclet

[Rafael Chaves]

For any interface based API (which is a common practice), getClass()
is a show stopper. A client of the API does not know the actual
classes involved (they are not API).

I was not suggesting actually using the instanceof operator (I am not
sure you really meant that, as it is not really possible), but
Class.isInstanceOf(object). A similar thing would be
Class.isAssignableFrom(object.getClass()).

Cheers,

Rafael

On Wed, Dec 22, 2010 at 10:06 AM, Terence Parr <parrt at cs.usfca.edu> wrote:
> Seems like I could do instanceof by just walking the Class.superClass/implements chain, right?  I'm not considering generating code; makes it hard to port ;)
> Ter
> On Dec 22, 2010, at 10:01 AM, Brian Clapper wrote:
>
>> On 12/22/10 12:51 PM, Terence Parr wrote:
>>>
>>> On Dec 22, 2010, at 9:38 AM, Brian Clapper wrote:
>>>>> contract), I ended up using ASM to generate interfaces on the fly, which I then
>>>> implement via java.lang.reflect.Proxy.
>>>
>>> BTW, for renderers i did == on obj.getClass() not instanceof (which only works
>>> on class names not Class ptrs).  Is it a serious problem if i don't allow
>>> instanceof?  Maybe if the model object is hidden by interfaces like jdbc.
>>> hmm... i'd rather avoid the java.lang.reflect.Proxy stuff.
>>
>> I don't use instanceof, so it won't affect me.
>>
>> I deliberately chose java.lang.reflect.Proxy, for a couple reasons. First,
>> generating the byte code for an interface, via ASM, is straightforward and
>> simple. Generating a wrapper class, on the other hand, is more complicated and
>> annoying. Second, using Proxy to implement an interface on the fly is also
>> straightforward.
>>
>> This technique allows for more maintainable code, in my opinion. If I'm going
>> to resort to generating byte code on the fly, I'd like that part of the
>> solution to be a dead-simple as possible. Use of Proxy made that possible. If I
>> weren't generating the byte code for the wrapper interface on the fly, I
>> wouldn't be using Proxy at all.
>>
>> If I could get rid of byte code generation entirely, it'd be a real win.
>> --
>> -Brian
>>
>> Brian Clapper, http://www.clapper.org/bmc/
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