Discussion: Unified Expression Language Functions

[Adrian Crum-2]

That's my work address and it has all non-USA IP addresses blocked. You can use this one for personal emails.

-Adrian


--- On Fri, 12/19/08, Jacques Le Roux <[hidden email]> wrote:

> From: Jacques Le Roux <[hidden email]>
> Subject: Re: Discussion: Unified Expression Language Functions
> To: [hidden email]
> Date: Friday, December 19, 2008, 11:49 PM
> Thanks Adrian,
>
> I tried to send you a msg directly but got
> This is an automatically generated Delivery Status
> Notification.      Delivery to the following recipients is
> still underway after 20.3 hour(s):
>  * [hidden email]
> Will keep trying and contact you if the message can't
> be delivered permanently.
>
> I suppose it's a one way address
>
> Jacques
>
> From: "Adrian Crum" <[hidden email]>
> >
> http://jcp.org/aboutJava/communityprocess/final/jsr245/
> >
> > Click on one of the Download links, accept the terms,
> then download the file marked:
> >
> > JavaServer Pages 2.1 Expression Language Specification
> (pdf)
> >
> > -Adrian
> >
> > Jacques Le Roux wrote:
> >> Thanks for clarification Adrian,
> >>
> >> I must admit the information in
> http://java.sun.com/products/jsp/reference/techart/unifiedEL.html
> are not quite clear :/
> >> I think I got most it though, is there a better
> reference ?
> >>
> >> I did a bunch of change. I guess now that most of
> them were correct, but as I had a doubt I reverted them all
> but the one I was sure. Anyway I will re-do some
> >>
> >> Jacques
> >>
> >> From: "Adrian Crum"
> <[hidden email]>
> >>> Jacques,
> >>>
> >>> UEL supports ternary operations. So,
> >>>
> >>> <set
> field="parameters.debitTotal"
> value="${bsh:(showDebit? (debitTotal
> >>> + absolutePostedBalance): (debitTotal))}"
> type="BigDecimal"/>
> >>>
> >>> becomes
> >>>
> >>> <set
> field="parameters.debitTotal"
> value="${showDebit ? (debitTotal +
> >>> absolutePostedBalance) : debitTotal}"
> type="BigDecimal"/>
> >>>
> >>> Also, the reason for the UEL function name
> prefix (math: str: util:) is
> >>> the same reason we have Java package names and
> XML namespaces - to avoid
> >>> function name clash.
> >>>
> >>> -Adrian
> >>>
> >>>
> >>> Jacques Le Roux wrote:
> >>>> Hi Adrian,
> >>>>
> >>>> Is {util: syntax also dealing with ternary
> operator (did not look into
> >>>> details, doing some {bsh: to {util:
> changes while changing(/adding) type
> >>>> from "Double" to
> "BigDecimal" as David suggested recently
> >>>>
> >>>> Thanks
> >>>>
> >>>> Jacques
> >>>>
> >>>> From: "Adrian Crum"
> <[hidden email]>
> >>>>> Now that we have the Unified
> Expression Language implemented in
> >>>>> FlexibleStringExpander, we gain the
> ability to use UEL functions.
> >>>>>
> >>>>> On the plus side, UEL functions can
> make screen widget and
> >>>>> mini-language code more flexible and
> more powerful. On the minus side,
> >>>>> you have to know the functions and
> what they do (in other words, no
> >>>>> auto-completion when working in XML).
> >>>>>
> >>>>> As an example, I frequently need to
> know the size of a List, Map, or
> >>>>> String. With current code, I have to
> use the bsh: prefix and a short
> >>>>> script:
> >>>>>
> >>>>> <set field="mapSize"
> value="${bsh:uiLabelMap.size();}"
> type="Integer"/>.
> >>>>>
> >>>>> Using a UEL function:
> >>>>>
> >>>>> <set field="mapSize"
> value="${util:size(uiLabelMap)}"
> type="Integer"/>
> >>>>>
> >>>>> or to get the length of a String:
> >>>>>
> >>>>> <set field="stringSize"
> value="${util:size(uiLabelMap.CommonParty)}"
> >>>>> type="Integer"/>.
> >>>>>
> >>>>> I don't know if this would be of
> any use, or if it is desirable. I'm
> >>>>> just tossing the idea out there for
> discussion.
> >>>>>
> >>>>> -Adrian
> >>>>>
> >>>>
> >>>>
> >>>
> >>
> >>
> >