Re: [Springframework-developer] PropertyPathFactoryBean

[<jue...@we...>]

Well, effectively we already *have* a built-in kind of expression =
language: BeanWrapper's property path evaluation capabilities, roughly =
following JSTL EL syntax. All that PropertyPathFactoryBean does is =
evaluate such BeanWrapper-style property paths on a given target bean.
=20
I guess that's as convenient as you can get without the BeanFactory =
knowing about what's going on here (i.e. without the core factory =
knowing about expressions).
=20
Regarding constants: Since 1.1 RC2, we have a FieldRetrievingFactoryBean =
which can be used to retrieve static fields:

// standard definition for exposing a static field, specifying the =
"staticField" property
<bean id=3D"myField" =
class=3D"org.springframework.beans.factory.config.FieldRetrievingFactoryB=
ean">
   <property =
name=3D"staticField"><value>java.sql.Connection.TRANSACTION_SERIALIZABLE<=
/value></property>
</bean>

// convenience version that specifies a static field pattern as bean =
name (since 1.1.2)
<bean id=3D"java.sql.Connection.TRANSACTION_SERIALIZABLE" =
class=3D"org.springframework.beans.factory.config.FieldRetrievingFactoryB=
ean"/>

If it's just about the odd constant in your XML bean definitions, this =
should be good enough. Of course, full-fledged scripting support *is* =
desirable for needs that go beyond that: for example, to specify entire =
bean definitions in scripts. I see those as two different goals, though.

Juergen


________________________________

Von: spr...@li... im Auftrag =
von Rod Johnson
Gesendet: Mo 04.10.2004 22:51
An: spr...@li...
Betreff: RE: [Springframework-developer] PropertyPathFactoryBean



Have to say that this looks to me like it's making a case for an =
expression
language instead of a FactoryBean.

A similar requirement that would also be well addressed by =
OGNL/whatever:
evaluating a constant. E.g. an AutowireCapableBeanFactory constant, =
which I
recently had to configure via a property. It would be nice to be able to =
do
that easily.

Rgds
Rod

-----Original Message-----
From: spr...@li...
[mailto:spr...@li...] On Behalf =
Of
Colin Sampaleanu
Sent: 04 October 2004 18:32
To: spr...@li...
Subject: Re: [Springframework-developer] PropertyPathFactoryBean

Good stuff. It overlaps of course with the mythical OGNL or expression
support which keeps getting pushed back, but in the meantime provides =
some
of the benefits for pretty little extra code...


j=FCrgen h=F6ller [werk3AT] wrote:

>I've just added a PropertyPathFactoryBean, following this suggestion:
>
>http://opensource.atlassian.com/projects/spring/browse/SPR-343
>
>
>Usage examples:
>
> // target bean to be referenced by name <bean id=3D"tb"
> class=3D"org.springframework.beans.TestBean" singleton=3D"false">
>   <property name=3D"age"><value>10</value></property>
>   <property name=3D"spouse">
>     <bean class=3D"org.springframework.beans.TestBean">
>       <property name=3D"age"><value>11</value></property>
>     </bean>
>   </property>
> </bean>
>
> // will result in 12, which is the value of property 'age' of the
> inner bean <bean id=3D"propertyPath1"
class=3D"org.springframework.beans.factory.config.PropertyPathFactoryBean=
">
>   <property name=3D"targetObject">
>     <bean class=3D"org.springframework.beans.TestBean">
>       <property name=3D"age"><value>12</value></property>
>     </bean>
>   </property>
>   <property name=3D"propertyPath"><value>age</value></property>
> </bean>
>
> // will result in 11, which is the value of property 'spouse.age' of =
bean
'tb'
> <bean id=3D"propertyPath2"
class=3D"org.springframework.beans.factory.config.PropertyPathFactoryBean=
">
>   <property name=3D"targetBeanName"><value>tb</value></property>
>   <property name=3D"propertyPath"><value>spouse.age</value></property>
> </bean>
>
> // will result in 10, which is the value of property 'age' of bean =
'tb'
> <bean id=3D"tb.age"
> =
class=3D"org.springframework.beans.factory.config.PropertyPathFactoryBea
> n"/>
>
>
>The last one, interpreting the bean name as 'beanName.property' =
pattern, is
quite concise...
>=20
>




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