Unified EL Spec says:
If A is String: return A
Otherwise, if A is null: return ""
...
On 10/24/07, Matthias Wessendorf <matzew_at_apache.org> wrote:
> Hi,
>
> in com.sun.el.lang.ELSupport.coerceToString()
> I noticed that a in case of a null String, the method returns "";
>
>
> The way down.
> In the converter:
> if (patternExpression != null) {
> pattern = (String)
> ELUtils.evaluateValueExpression(patternExpression, elContext);
> }
>
> in
>
> com.sun.faces.el.ELUtils.evaluateValueExpression()
> (expectedType == String... for the pattern)
>
> if (this.expectedType != null) {
> return ELSupport.coerceToType(value, this.expectedType);
> }
>
> coerceToType CALLs the coerceToString()
>
>
> public final static String coerceToString(final Object obj) {
> if (obj == null) {
> return "";
> ...
> }
>
> So, that is the reason why "" is returned.
>
> Stupid question... is that correct ?
>
> thx,
> Matthias
>
>
> On 10/24/07, Matthias Wessendorf <matzew_at_apache.org> wrote:
> > Hi,
> >
> > using JSF RI (1_2_04-p02) + Trinidad 1.2.x
> >
> > I noticed the following, when a "pattern" is null, like
> >
> >
> > <tr:inputText >
> > <tr:convertDateTime pattern="#{null}"/>
> > </tr:inputText>
> >
> > A "default" date is visible.
> >
> > But with f: (using the RI Tag to create the overridden DateTimeConverter)
> > <tr:inputText >
> > <f:convertDateTime pattern="#{null}"/>
> > </tr:inputText>
> >
> > nothing is displayed.
> >
> > The null get's resolved as "" and therefore the DateFormat "parser"
> > returns no date.
> >
> > Someone noticed this too ?
> >
> >
> > --
> > Matthias Wessendorf
> >
> > further stuff:
> > blog: http://matthiaswessendorf.wordpress.com/
> > mail: matzew-at-apache-dot-org
> >
>
>
> --
> Matthias Wessendorf
>
> further stuff:
> blog: http://matthiaswessendorf.wordpress.com/
> mail: matzew-at-apache-dot-org
>
--
Matthias Wessendorf
further stuff:
blog: http://matthiaswessendorf.wordpress.com/
mail: matzew-at-apache-dot-org