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http://issues.apache.org/jira/browse/IBATIS-50?page=comments#action_12415039 ]
Jeff Butler commented on IBATIS-50:
-----------------------------------
I've committed the changes for this. I'd appreciate some of the issue watchers
taking some time to test in addition to the testing I've already completed. To
use the new support:
1. Write a class that implements the new interface
com.ibatis.sqlmap.engine.mapping.result.ResultObjectFactory. Javadocs on that
interface give a lot of information. I'll get the information into the user's
guide too.
2. Declare your factory in SqlMapConfig like this:
<sqlMapConfig>
...
<resultObjectFactory type="test.MyResultObjectFactory">
<property name="myProperty" value="someValue" />
</resultObjectFactory>
...
</sqlMapConfig>
The new <resultObjectFactory> element is after the <settings> element.
> 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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