dev@javaserverfaces.java.net

Re: EL: isReadOnly()

From: Matthias Wessendorf <matzew_at_apache.org>
Date: Thu, 10 Jan 2008 17:07:56 -0800

I meant to say there is no ValueExpression for " ", but for "" there is.

anyway :)
-M

On Jan 10, 2008 4:47 PM, Matthias Wessendorf <matzew_at_apache.org> wrote:
> Just tested<input value=" " />
>
> and saw this is not readOnly...
>
>
>
> On Jan 10, 2008 4:22 PM, Matthias Wessendorf <matzew_at_apache.org> wrote:
> > Ryan/Jacob.
> >
> > is this in the EL-Spec ?
> > that something like
> > <input value="" /> returns a readOnly:true ValueExpression?
> >
> > Thx,
> > Matthias
> >
> >
> > On Jan 7, 2008 11:00 AM, Jacob Hookom <jacob_at_hookom.net> wrote:
> > > Yeah... the work I did on the Apache EL was pre-spec completion and
> > > there's since been other patches submitted through Tomcat by the
> > > IBM/Geronimo folks.
> > >
> > >
> > > Matthias Wessendorf wrote:
> > > > Nope, just that the JSF 1.1 EL was (in MyFaces ;-) ) returning null as well.
> > > >
> > > > -M
> > > >
> > > > On Jan 7, 2008 7:31 PM, Ryan Lubke <Ryan.Lubke_at_sun.com> wrote:
> > > >
> > > >> Matthias Wessendorf wrote:
> > > >>
> > > >>> Hi,
> > > >>>
> > > >>>
> > > >>>
> > > >>>> If it's not a real expression then shouldn't it be read-only? You
> > > >>>> certainly can't call
> > > >>>> setValue() on it and expect it to work. So I think my original quote
> > > >>>> still holds true.
> > > >>>>
> > > >>>>
> > > >>> I wonder why tomcat handle's this as NULL.
> > > >>> In case of an object, the readonly is OK.
> > > >>>
> > > >>>
> > > >> I think it's a bug in Tomcat's EL implementation.
> > > >>
> > > >> See what I've quoted previously. Can you find something in the spec to
> > > >> support
> > > >> your thoughts about the Tomcat behavior being correct?
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>> -Matthias
> > > >>>
> > > >>>
> > > >>>
> > > >>>>
> > > >>>>> What is your take on that ?
> > > >>>>>
> > > >>>>> -Matthias
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> On Dec 20, 2007 11:39 PM, Matthias Wessendorf <matzew_at_apache.org> wrote:
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>>> yah,
> > > >>>>>> tomorrow :-)
> > > >>>>>>
> > > >>>>>>
> > > >>>>>> On Dec 20, 2007 9:09 PM, Jacob Hookom <jacob_at_hookom.net> wrote:
> > > >>>>>>
> > > >>>>>>
> > > >>>>>>
> > > >>>>>>> I agree with Ryan, it should be read-only-- if you get that VE, can you
> > > >>>>>>> do a getClass() on it and let us know the type?
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>> Ryan Lubke wrote:
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>>> Matthias Wessendorf wrote:
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>> ok, this is only in Jetty;
> > > >>>>>>>>> just tested w/ a tomcat 6.x
> > > >>>>>>>>>
> > > >>>>>>>>> and <tr:inputText label="Label a)" value=""/>
> > > >>>>>>>>> renders as a regular inputText field;
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>> I think this may be a bug in Tomcat. The javadocs for ValueExpression
> > > >>>>>>>> states:
> > > >>>>>>>>
> > > >>>>>>>> <quote>
> > > >>>>>>>> In previous incarnations of this API, expressions could only be read.
> > > >>>>>>>> ValueExpression objects can now be
> > > >>>>>>>> used both to retrieve a value and to set a value. Expressions that can
> > > >>>>>>>> have a value set on them are referred to as
> > > >>>>>>>> l-value expressions. Those that cannot are referred to as r-value
> > > >>>>>>>> expressions. Not all r-value expressions can be
> > > >>>>>>>> used as l-value expressions (e.g. "${1+1}" or "${firstName}
> > > >>>>>>>> ${lastName}"). See the EL
> > > >>>>>>>> Speciļ¬cation for details. Expressions that cannot be used as l-values
> > > >>>>>>>> must always return true from
> > > >>>>>>>> isReadOnly().
> > > >>>>>>>> </quote>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>> -M
> > > >>>>>>>>>
> > > >>>>>>>>> On Dec 20, 2007 5:43 PM, Matthias Wessendorf <matzew_at_apache.org> wrote:
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>> Hi,
> > > >>>>>>>>>>
> > > >>>>>>>>>> I have a <tr:inputText value="">
> > > >>>>>>>>>> The underlying API, says this ValueExpression is readOnly.
> > > >>>>>>>>>>
> > > >>>>>>>>>> A simple JSPX makes that clear
> > > >>>>>>>>>> (I am on JETTY jetty-6.1.2rc2 and the RI )
> > > >>>>>>>>>> I think, they (re) use the glassfish shipped javax.el
> > > >>>>>>>>>>
> > > >>>>>>>>>>
> > > >>>>>>>>>> <?xml version='1.0' encoding='utf-8'?>
> > > >>>>>>>>>> <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2">
> > > >>>>>>>>>>
> > > >>>>>>>>>> <jsp:directive.page contentType="text/plain"/>
> > > >>>>>>>>>> <jsp:directive.page import="javax.servlet.jsp.*"/>
> > > >>>>>>>>>> <jsp:directive.page import="javax.el.*"/>
> > > >>>>>>>>>> <jsp:directive.page import="javax.faces.context.*"/>
> > > >>>>>>>>>> <jsp:scriptlet>
> > > >>>>>>>>>> JspApplicationContext jac =
> > > >>>>>>>>>> JspFactory.getDefaultFactory().getJspApplicationContext(application);
> > > >>>>>>>>>> ExpressionFactory ef = jac.getExpressionFactory();
> > > >>>>>>>>>> ValueExpression ve = ef.createValueExpression("", Object.class);
> > > >>>>>>>>>> out.println(ve.isLiteralText());
> > > >>>>>>>>>>
> > > >>>>>>>>>> out.println(ve.isReadOnly(FacesContext.getCurrentInstance().getELContext()));
> > > >>>>>>>>>>
> > > >>>>>>>>>>
> > > >>>>>>>>>> </jsp:scriptlet>
> > > >>>>>>>>>> </jsp:root>
> > > >>>>>>>>>>
> > > >>>>>>>>>> --
> > > >>>>>>>>>> Matthias Wessendorf
> > > >>>>>>>>>>
> > > >>>>>>>>>> further stuff:
> > > >>>>>>>>>> blog: http://matthiaswessendorf.wordpress.com/
> > > >>>>>>>>>> sessions: http://www.slideshare.net/mwessendorf
> > > >>>>>>>>>> mail: matzew-at-apache-dot-org
> > > >>>>>>>>>>
> > > >>>>>>>>>>
> > > >>>>>>>>>>
> > > >>>>>>>>>>
> > > >>>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>> ---------------------------------------------------------------------
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> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>>>
> > > >>>>>>> ---------------------------------------------------------------------
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> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>> --
> > > >>>>>> Matthias Wessendorf
> > > >>>>>>
> > > >>>>>> further stuff:
> > > >>>>>> blog: http://matthiaswessendorf.wordpress.com/
> > > >>>>>> sessions: http://www.slideshare.net/mwessendorf
> > > >>>>>> mail: matzew-at-apache-dot-org
> > > >>>>>>
> > > >>>>>>
> > > >>>>>>
> > > >>>>>>
> > > >>>>>
> > > >>>>>
> > > >>>> ---------------------------------------------------------------------
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> > > >>>>
> > > >>>>
> > > >>>>
> > > >>>>
> > > >>>
> > > >>>
> > > >>>
> > > >> ---------------------------------------------------------------------
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> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > > ------------------------------------------------------------------------
> > > >
> > > > No virus found in this incoming message.
> > > > Checked by AVG Free Edition.
> > > > Version: 7.5.516 / Virus Database: 269.17.13/1213 - Release Date: 1/7/2008 9:14 AM
> > >
> > > >
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> > >
> >
> >
> >
> > --
> >
> > Matthias Wessendorf
> >
> > further stuff:
> > blog: http://matthiaswessendorf.wordpress.com/
> > sessions: http://www.slideshare.net/mwessendorf
> > mail: matzew-at-apache-dot-org
> >
>
>
>
> --
>
> Matthias Wessendorf
>
> further stuff:
> blog: http://matthiaswessendorf.wordpress.com/
> sessions: http://www.slideshare.net/mwessendorf
> mail: matzew-at-apache-dot-org
>



-- 
Matthias Wessendorf
further stuff:
blog: http://matthiaswessendorf.wordpress.com/
sessions: http://www.slideshare.net/mwessendorf
mail: matzew-at-apache-dot-org