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From "Jeff Butler (JIRA)" <ibatis-...@incubator.apache.org>
Subject [jira] Commented: (IBATIS-50) Ability to override the default bean creation mechanism
Date Mon, 05 Jun 2006 17:39:37 GMT
    [ http://issues.apache.org/jira/browse/IBATIS-50?page=comments#action_12414801 ] 

Jeff Butler commented on IBATIS-50:
-----------------------------------

Another thought for my proposed solution...

Does anyone see a benefit of knowing the statement for which the object create is being requested?
 For example, would you create an object one way for a certain statement, and another way
for another statement?  

We could pass the statement id as an attribute to the create request if this would be helpful.


> Ability to override the default bean creation mechanism
> -------------------------------------------------------
>
>          Key: IBATIS-50
>          URL: http://issues.apache.org/jira/browse/IBATIS-50
>      Project: iBatis for Java
>         Type: Wish

>   Components: SQL Maps
>     Versions: 2.0.9
>     Reporter: Philippe Laflamme
>     Assignee: Jeff Butler

>
> Currently, iBatis is responsible for creating instances of classes used in result maps.
It relies on the assumption that objects can be obtained using the Class.newInstance() method
(or something equivalent).
> The assumption forces users of the framework to create classes with a no-arg default
constructor. IMHO, this also has the effect of favoring implementation inheritance (extends)
over interface inheritance.
> Although this is not a problem in most cases, the ability to plug in an external instance
factory would provide more flexibility and favor good programming practices. Amongst other
things, it would provide developers the ability write code in terms of interface.
> A simple solution is to provide an extension point where resultMap class instances are
obtained from.
> The simplest form would be:
> public interface InstanceFactory {
>   Object createInstance(Class resultMapClass);
> }
> The default implementation would do something along the lines of:
> [...]
> return resultMapClass.newInstance();
> [...]
> Developers could configure iBatis to either use the default implementation or their own
custom implementation. The setting could be part of the sqlMapConfig file or even per resultMap.

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