Re: [Springframework-developer] webflow: validators

[Steven D. <ste...@gm...>]

> At the moment SWF does not have any direct binding & validation support of
> its own: it just uses the Spring binding and validation infrastructure
> (DataBinder, Errors, Validator). I don't think binding and validation is
> really a feature that we should build *into* SWF. Instead we need to
> integrate with existing solutions.

I hear you. It's just that I really would like to see declarative
validation rules. Besides, a validator that would support this would
simply be a specialization of the Validator interface.

> 
> Could you elaborate on the "XWork validators" a bit?
> 
This example says it all:

<validators>
    <field name="bar">
        <field-validator type="required">
            <message>You must enter a value for bar.</message>
        </field-validator>
        <field-validator type="int">
            <param name="min">6</param>
            <param name="max">10</param>
            <message>bar must be between ${min} and ${max}, current
value is ${bar}.</message>
        </field-validator>
    </field>
    <field name="date">
        <field-validator type="date">
            <param name="min">12/22/2002</param>
            <param name="max">12/25/2002</param>
            <message>The date must be between 12-22-2002 and
12-25-2002.</message>
        </field-validator>
    </field>
    <field name="foo">
        <field-validator type="int">
            <param name="min">0</param>
            <param name="max">100</param>
            <message key="foo.range">Could not find foo.range!</message>
        </field-validator>
    </field>
    <validator type="expression">
        <param name="expression">foo &gt; bar</param>
        <message>Foo must be greater than Bar. Foo = ${foo}, Bar =
${bar}.</message>
    </validator>
</validators>