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
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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