expressionFactory.createValueExpression(FacesContext.getApplication().getElContext(),
#{some.expression},
Some.class)
On 1/17/07, Michael Youngstrom <youngm_at_gmail.com> wrote:
> Try looking at:
>
> http://java.sun.com/javaee/javaserverfaces/1.2_MR1/docs/api/javax/faces/application/Application.html#getExpressionFactory()
>
> http://java.sun.com/javaee/javaserverfaces/1.2_MR1/docs/api/javax/faces/application/Application.html#evaluateExpressionGet(javax.faces.context.FacesContext,%20java.lang.String,%20java.lang.Class)
>
> and then look here for info on how the ELExpressionFactory works:
>
> http://java.sun.com/javaee/5/docs/api/
>
> Mike
>
>
>
> On 1/17/07, Todd Patrick <Todd.Patrick_at_dtn.com> wrote:
> > What I am trying to do is the following:
> >
> > In my login method, I create a visit object and set the visit's user
> > property with a User object.
> >
> > Inside the try statement, what I had before was:
> >
> > facesContext.getApplication().createValueBinding("#{" +
> > Constants.VISIT_KEY_SCOPE + Constants.VISIT_KEY +
> > "}").setValue(facesContext, visit);
> >
> > This create an expression with the value of the visit object with it's
> > User object property set.
> >
> > I think I am close with:
> >
> > facesContext.getApplication().getExpressionFactory().createValueExpressi
> > on(elcontext, "#{" + Constants.VISIT_KEY_SCOPE + Constants.VISIT_KEY +
> > "}", Visit.class);
> >
> > But, I still can't get the expression set to the visit object.
> >
> > Currently, I am reading about ELResolver...
> >
> > Thanks again,
> >
> > --Todd
> >
> >
> >
> > public String login() {
> > FacesContext facesContext = getFacesContext();
> > Authenticate auth = new Authenticate();
> > auth.setPassword(this.password);
> >
> > if (auth.authenticateUser(this.username)) {
> > User newUser = new User(this.username);
> > Visit visit = new Visit();
> > visit.setUser(newUser);
> > visit.setAuthenticationBean(this);
> > setVisit(visit);
> >
> > try {
> > //facesContext.getApplication().createValueBinding("#{"
> > + Constants.VISIT_KEY_SCOPE + Constants.VISIT_KEY +
> > "}").setValue(facesContext, visit);
> > ELContext elcontext = facesContext.getELContext();
> >
> > facesContext.getApplication().getExpressionFactory().createValueExpressi
> > on(elcontext, "#{" + Constants.VISIT_KEY_SCOPE + Constants.VISIT_KEY +
> > "}", Visit.class);
> >
> > HttpServletResponse resp = (HttpServletResponse)
> > facesContext.getExternalContext().getResponse();
> > HttpServletRequest req = (HttpServletRequest)
> > facesContext.getExternalContext().getRequest();
> >
> > resp.sendRedirect(req.getContextPath() +
> > Constants.BASE_URL);
> > } catch (IOException e) {
> > logger.warn("Authenticate: Unable to redirect user.",
> > e);
> > } catch (ELException e) {
> > logger.warn("Unable to bind a value.", e);
> > }
> > } else {
> > this.logout();
> > }
> >
> > return SUCCESS_OUTCOME;
> > }
> >
> >
> >
> >
> > -----Original Message-----
> > From: Jason Lee [mailto:lee_at_iecokc.com]
> > Sent: Wednesday, January 17, 2007 2:47 PM
> > To: users_at_javaserverfaces.dev.java.net
> > Subject: RE: I am stumped on how to move from
> > Application.createValueBinding to
> > ExpressionFactory.createValueExpression
> >
> > Are you trying to register a variable that components can then
> > reference, like the var attribute on a dataTable? If so, try this:
> >
> > ELContext ec = FacesContext.getCurrentInstance().getELContext();
> > ELResolver er = ec.getELResolver();
> > er.setValue(ec, null, "foo", valueOfFoo);
> >
> > -----
> > Jason Lee, SCJP
> > Programmer/Analyst
> > http://www.iec-okc.com
> >
> >
> > > -----Original Message-----
> > > From: Todd Patrick [mailto:Todd.Patrick_at_dtn.com]
> > > Sent: Wednesday, January 17, 2007 2:40 PM
> > > To: users_at_javaserverfaces.dev.java.net
> > > Subject: I am stumped on how to move from
> > > Application.createValueBinding to
> > > ExpressionFactory.createValueExpression
> > >
> > > I am looking at two APIs:
> > >
> > > http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/index.
> > > html?javax
> > > /faces/application/Application.html
> > >
> > > http://java.sun.com/javaee/5/docs/api/
> > >
> > >
> > > Looking at the documentation I need to go from:
> > >
> > > Visit visit = new Visit();
> > > facesContext.getApplication().createValueBinding("#{" +
> > > Constants.VISIT_KEY_SCOPE + Constants.VISIT_KEY +
> > > "}").setValue(facesContext, visit);
> > >
> > >
> > > To the JSF 1.2 requirement:
> > >
> > > ELContext elcontext = facesContext.getELContext();
> > > facesContext.getApplication().getExpressionFactory().createMet
> > > hodExpress
> > > ion(elcontext, "#{" + Constants.VISIT_KEY_SCOPE + Constants.VISIT_KEY
> > > + "}", String.class, new Class<?>[0]);
> > >
> > >
> > > The createMethodExpression method has be stumped at the moment.
> > >
> > > How do I get my visit object into the value of the expression (second
> > > parameter in createMethodExpression)?
> > >
> > > Thanks,
> > >
> > > --Todd
> > >
> > >
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