4 messages in org.apache.commons.userRe: [Digester] Problem using recursio...| From | Sent On | Attachments |
|---|---|---|
| Arshika Mishra | Feb 28, 2007 3:31 am | |
| Craig McClanahan | Feb 28, 2007 3:12 pm | |
| Arshika Mishra | Mar 1, 2007 9:39 pm | |
| Vikram | Mar 14, 2007 4:44 am |
| Subject: | Re: [Digester] Problem using recursion in xml rule file | |
|---|---|---|
| From: | Craig McClanahan (crai...@apache.org) | |
| Date: | Feb 28, 2007 3:12:01 pm | |
| List: | org.apache.commons.user | |
On 2/28/07, Arshika Mishra <Arsh...@lntinfotech.com> wrote:
Hi!
I am trying to parse an XML file using digester but getting a problem. The file has a recursive tag. The format of the file given below:
<dpr-domain name="AircraftPerformances"> <dpr-data-category name="AircraftClass" systemOption="FULLOLDI"> <dpr-attribute name="landingSpeed" systemOption="HALFOLDI"/> <dpr-data-category name="holdingParameters" systemOption="HALFOLDI"> <dpr-attribute name="maximumspeed1" systemOption="FULLOLDI"/> </dpr-data-category> <dpr-data-category name="turnRate" systemOption="FULLOLDI,HALFOLDI"> <dpr-attribute name="maximumspeed2" systemOption="FULLOLDI"/> <dpr-data-category name="accelerateRate" systemOption="HALFOLDI"> <dpr-attribute name="maximumspeed21" systemOption="FULLOLDI"/> <dpr-data-category name="descendRate" systemOption="HALFOLDI"> <dpr-attribute name="maximumspeed211" systemOption="FULLOLDI"/> </dpr-data-category> </dpr-data-category> </dpr-data-category> </dpr-data-category> </dpr-domain>
The rule file I have written for this is: <digester-rules> <pattern value="dpr-domain"> <object-create-rule classname="check.Domain"/> <pattern value="*/dpr-data-category"> <object-create-rule classname="check.DataCategory"/> <set-properties-rule/> <pattern value="dpr-attribute"> <object-create-rule classname="check.Attribute"/> <set-properties-rule/> <set-next-rule methodname="addAttributes" /> </pattern> <set-next-rule methodname="addDataCategory" paramtype="check.DataCategory"/> </pattern> </pattern> </digester-rules>
But this is not working. If the "dpr-domain" tag is removed, then it works. Please help me by giving a solution for this problem.
Arshika,
I never use the XML format for defining rules, so I'm a little fuzzy on how it really works. However, it seems to me that you would *not* want to nest your category pattern inside the domain pattern when you use the "*" prefix for recursion. The problem is that the composite pattern will be trying to match "dpr-domain/*/dpr-data-category" and I do not think Digester knows how to deal with wildcards in the middle like that.
Try something along these lines instead:
<digester-rules>
<pattern value="dpr-domain"> ... rules for a new domain ... </pattern>
<pattern value="*/dpr-data-category"> ... rules for a new category ... <pattern value="dpr-data-attribute"> ... rules for a new attribute ... </pattern> </pattern>
</digester-rules>
Craig
Regards, Arshika Mishra
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