Re: [Springframework-developer] declarative rules-based bean validator w/ attributes in sandbox

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Anna,

There is a indirect relationship between the two.

The BeanValidatorBuilder instantiates PropertyValidators for a bean's
properties and places them in that beans corresponding BeanInfo.  The
DefaultBeanValidationService then looks up those validators by querying the
BeanInfo and subsequently processes them.  So there is a level of
indirection there.

We're basically leveraging the existing javabeans metadata classes as
opposed to rolling our own cache (which simplifies things and seems quite
elegant.)

More specifically, a validated bean will have the following characteristics:

1. The BeanInfo.beanDescriptor has the property
BeanValidatorConstants.VALIDATED set to "true".

2. For each validated property, it's propertyDescriptor also has the
property BeanValidatorConstants.VALIDATED also set to "true".  In addition,
the BeanValidatorConstants.VALIDATOR property stores a reference to the
corresponding PropertyValidator, which encapsulates all the
PropertyValidationRules.

What the defaultBeanValidationService does is query the BeanInfo of the bean
class when it is asked to validate a bean.  If the BeanDescriptor is not
marked as "validateable", the service returns, doing nothing.  Else it runs
over each property doing the same thing recursively down the object graph,
invoking validate() on any found PropertyValidators.

One issue that likely needs to be addressed is a result of BeanInfo caching
differences between JDK 1.3 and 1.4.  I know under JDK 1.4 BeanInfo
instances are shared by the Introspector  (caching is built in.)  I believe
under JDK 1.3, however, that is not the case--new BeanInfo copies are
returned on each call to the Introspector. :-(

Keith

----- Original Message ----- 
From: "Anna Chen" <ac...@er...>
To: <spr...@li...>
Sent: Tuesday, March 16, 2004 3:09 PM
Subject: RE: [Springframework-developer] declarative rules-based bean
validator w/ attributes in sandbox

> Keith,
>
> Could you tell me the relationship between DefaultBeanValidationService
and
> beanValidatorBuilder?
>
> I could not find where beanValidatorBuilder get called.
>
> Thanks,
>
> Anna
>
> -----Original Message-----
> From: spr...@li...
> [mailto:spr...@li...]On Behalf
> Of Keith Donald
> Sent: Saturday, March 13, 2004 6:44 PM
> To: spr...@li...
> Subject: Re: [Springframework-developer] declarative rules-based bean
> validator w/ attributes in sandbox
>
>
> Anna,
>
> I've since been updating the unit tests of the declarative validation
stuff,
> so I thought I'd go ahead and attach a working sample that also exists in
> the sandbox/test/org/springframework/validation test area.  As we do more
> testing, we'll get better samples, too.
>
> The sample below shows 3 bean declarations: the beanValidatorService is
the
> main validator interface to the subsystem, and here is using the
> attributesValidatorSource to load on-demand validator information for
beans
> using commons-attributes.  The beanValidatorBuilder is an example of how
to
> configure validation rules for bean properties declaratively using Spring.
> In this example, the builder is configuring rules for the "name.lastName"
> and "favoriteToy" properties of the Pet bean (specifically the key in the
> propertyValidators map is the propertyName, and the value is a set of
> PropertyValidationRule instances.)
>
> --------------
>
>  <bean id="beanValidationService"
>
class="org.springframework.validation.support.DefaultBeanValidationService">
>    <property name="beanValidatorSource"><ref
> bean="attributesValidatorSource"/></property>
>  </bean>
>
>  <bean id="attributesValidatorSource"
> class="org.springframework.validation.support.AttributesValidatorSource"/>
>
>  <bean id="beanValidatorBuilder"
> class="org.springframework.validation.support.BeanValidatorBuilder">
>    <constructor-arg index="0">
>      <description>The validated bean type</description>
>      <value>org.springframework.validation.Pet</value>
>     </constructor-arg>
>     <property name="propertyValidators">
>       <map>
>         <entry key="name.lastName">
>           <bean class="org.springframework.validation.rules.Required"/>
>         </entry>
>         <entry key="favoriteToy">
>           <set>
>             <bean class="org.springframework.validation.rules.Required"/>
>             <bean class="org.springframework.validation.rules.MaxLength">
>               <constructor-arg
index="0"><value>25</value></constructor-arg>
>             </bean>
>           </set>
>         </entry>
>       </map>
>    </property>
> </bean>
>
> Keith
>
> ----- Original Message -----
> From: "Keith Donald" <kd...@cs...>
> To: <spr...@li...>
> Sent: Thursday, March 11, 2004 12:19 AM
> Subject: Re: [Springframework-developer] declarative rules-based bean
> validator w/ attributes in sandbox
>
>
> > Anna,
> >
> > Thanks... yea, I typed that by hand in the email from memory and I see I
> > made at least one mistake with a closing tag in the first bean
> declaration.
> > :-) I'll be sure to correct anything like that when we get some
> samples/docs
> > out.
> >
> > BTW, guys thanks for those commons attributes tips.  I haven't had time
to
> > go through their docs in detail and I really appreciate it.  I agree we
> > should keep the validation rule hierarchy as is.
> >
> > Keith
> >
> > ----- Original Message -----
> > From: "Anna Chen" <ac...@er...>
> > To: <spr...@li...>
> > Sent: Wednesday, March 10, 2004 4:04 PM
> > Subject: RE: [Springframework-developer] declarative rules-based bean
> > validator w/ attributes in sandbox
> >
> >
> > > Keith
> > >
> > > I don't think that the Spring IoC configuration is a valid one
according
> > to
> > > http://www.springframework.org/dtd/spring-beans.dtd
> > >
> > >
> > > Anna
> > >
> > > -----Original Message-----
> > > From: spr...@li...
> > > [mailto:spr...@li...]On
Behalf
> > > Of Keith Donald
> > > Sent: Wednesday, March 10, 2004 8:10 AM
> > > To: spr...@li...
> > > Subject: Re: [Springframework-developer] declarative rules-based bean
> > > validator w/ attributes in sandbox
> > >
> > >
> > > Correct me if I'm wrong, but I don't think there is.  However, I know
if
> > > you're using Eclipse, the sandbox code (including tests) automatically
> > gets
> > > incrementally compiled in target/other-classes, which is automatically
> put
> > > in the classpath.  So I have been basically running everything in the
> > > sandbox from Eclipse directly.
> > >
> > > Keith
> > >
> > > ----- Original Message -----
> > > From: <sam...@ma...>
> > > To: <spr...@li...>
> > > Sent: Wednesday, March 10, 2004 6:42 AM
> > > Subject: RE: [Springframework-developer] declarative rules-based bean
> > > validator w/ attributes in sandbox
> > >
> > >
> > > > Excellent, thanks Keith. On the subject of the sandbox, is there a
> build
> > > > directive to buils the sandbox code, or should I just overwrite the
> src
> > > with the
> > > > sandbox code and rebuild?
> > > >
> > > > sam
> > > >
> > > > Quoting Keith Donald <kd...@cs...>:
> > > >
> > > > > I checked in a "BeanValidatorBuilder" class in the sandbox under
> > > > > validation.support that allows you to declaratively assign
> > > > > PropertyValidationRules to bean properties via Spring-IoC, through
a
> > > > > scripting environment such as Groovy/Beanshell, or programatically
> in
> > =
> > > > > plain
> > > > > java.  This is in addition to support for defining validation
rules
> on
> > =
> > > > > beans
> > > > > via source markup.
> > > > >
> > > > > Here's an example on how to use it:
> > > > >
> > > > > Spring IoC configuration
> > > > >
> > > > > <bean id=3D"validatorBuilder"
> > > > >
class=3D"org.springframework.validation.support.ValidatorBuilder"/>
> > > > > <constructor-arg index=3D"0">
> > > > > <description>The validated bean type (class or
> > > > > interface) aka 'root entity'</description>
> > > > > <value>org.springframework.validation.Pet</value>
> > > > > </constructor-arg>
> > > > > <map>
> > > > > <description>
> > > > > A map of property name keys to one or more
> > > > > governing property validation rules.
> > > > > Nested bean property names from the 'root
> > > > > entity' are supported.
> > > > > Rule instances may be reused across
> > > > > properties if desired.
> > > > > </description>
> > > > > <entry key=3D"name.lastName">
> > > > > <value><bean
> > > > > class=3D"org.springframework.validation.rules.Required"/></value>
> > > > > </entry>
> > > > > <entry key=3D"favoriteToy">
> > > > > <value>
> > > > > <set>
> > > > > <bean
> > > > > class=3D"org.springframework.validation.rules.Required"/>
> > > > > <bean
> > > > > class=3D"org.springframework.validation.rules.MaxLength">
> > > > > =09
> > > > > <constructor-arg>25</constructor-arg>
> > > > >
> > > > > </bean>
> > > > > </set>
> > > > > </value>
> > > > > </entry>
> > > > > </map>
> > > > > </bean>
> > > > >
> > > > > Java
> > > > >
> > > > >         BeanValidatorBuilder builder =3D new =
> > > > > BeanValidatorBuilder(Pet.class);
> > > > >
> > > > >         builder.setPropertyValidator("name.lastName", new
> Required());
> >
> > > > >
> > > > >         Set toyRules =3D new HashSet();
> > > > >         toyRules.add(new Required());
> > > > >         toyRules.add(new MaxLength(255));
> > > > >         builder.setPropertyValidator("favoriteToy", toyRules);
> > > > >
> > > > > Keith
> > > >
> > > > sam
> > > > http://www.magpiebrain.com/
> > > >
> > > >
> > > >
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