Re: [OT] Digester question

[Jim Collins]

I haven't got it to work yet but you confirmed what I thought about not
being able to use nested tags and having to use attributes instead. I am
just checking out now how to use the FactoryCreateRule.

Jim.
- Original Message -
From: "Kris Schneider" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Monday, August 04, 2003 9:06 PM
Subject: Re: [OT] Digester question


> Um, so, that actually worked? ;-)
>
> Quoting Jim Collins <[EMAIL PROTECTED]>:
>
> > Kris,
> >
> > Thanks for the help.
> >
> > Jim.
> > - Original Message -
> > From: "Kris Schneider" <[EMAIL PROTECTED]>
> > To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
> > Sent: Monday, August 04, 2003 8:46 PM
> > Subject: Re: [OT] Digester question
> >
> >
> > > A bit out of my comfort zone on this one, but I think you might have
to
> > change
> > > your XML to something like:
> > >
> > > 
> > >   someText
> > > 
> > >
> > > because the FactoryCreateRule/ObjectCreationFactory stuff seems to
work
> > with an
> > > element's attributes, not its sub-elements. Then it looks like you
need
> > to
> > > subclass AbstractObjectCreationFactory and provode a createObject
method
> > impl
> > > that will extract the appropriate attribute values and construct your
> > > Configuration object. I'm sure other folks on the list (or on
> > commons-user) have
> > > more experience with this though...
> > >
> > > Quoting Jim Collins <[EMAIL PROTECTED]>:
> > >
> > > > Appologies for the off topic question. Does anyone know how I can
> > create
> > an
> > > > object with a constructor that takes agruments specified via XML
> > elements.
> > > >
> > > > I have a Configuration object with a constructor that takes two
String
> > > > parameters. The XML will be something like this:
> > > >
> > > > 
> > > > someText
> > > > someText
> > > > someText
> > > > 
> > > >
> > > > When the digester matches the config pattern it will create the
> > > > Configuration object passing param1 and param2 as parameters to the
> > > > constructor and then when it matches the pattern config/saveAs it
will
> > call
> > > > a method on the Configuration object.
> > > >
> > > > I have looked at the documentation and have seen the
FactoryCreateRule
> > but
> > > > I
> > > > am not sure how to use this and how I can get it to use the param1
and
> > > > param2 elements as the Constructor parameters.
> > > >
> > > > Once again sorry for the off topic post. Any hints would be
> > appreciated.
> > > >
> > > > Thanks
> > > >
> > > > Jim.
> > >
> > > --
> > > Kris Schneider <mailto:[EMAIL PROTECTED]>
> > > D.O.Tech   <http://www.dotech.com/>
>
> --
> Kris Schneider <mailto:[EMAIL PROTECTED]>
> D.O.Tech   <http://www.dotech.com/>
>
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Re: [OT] Digester question

[Kris Schneider]

Um, so, that actually worked? ;-)

Quoting Jim Collins <[EMAIL PROTECTED]>:

> Kris,
> 
> Thanks for the help.
> 
> Jim.
> - Original Message -
> From: "Kris Schneider" <[EMAIL PROTECTED]>
> To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
> Sent: Monday, August 04, 2003 8:46 PM
> Subject: Re: [OT] Digester question
> 
> 
> > A bit out of my comfort zone on this one, but I think you might have to
> change
> > your XML to something like:
> >
> > 
> >   someText
> > 
> >
> > because the FactoryCreateRule/ObjectCreationFactory stuff seems to work
> with an
> > element's attributes, not its sub-elements. Then it looks like you need
> to
> > subclass AbstractObjectCreationFactory and provode a createObject method
> impl
> > that will extract the appropriate attribute values and construct your
> > Configuration object. I'm sure other folks on the list (or on
> commons-user) have
> > more experience with this though...
> >
> > Quoting Jim Collins <[EMAIL PROTECTED]>:
> >
> > > Appologies for the off topic question. Does anyone know how I can
> create
> an
> > > object with a constructor that takes agruments specified via XML
> elements.
> > >
> > > I have a Configuration object with a constructor that takes two String
> > > parameters. The XML will be something like this:
> > >
> > > 
> > > someText
> > > someText
> > > someText
> > > 
> > >
> > > When the digester matches the config pattern it will create the
> > > Configuration object passing param1 and param2 as parameters to the
> > > constructor and then when it matches the pattern config/saveAs it will
> call
> > > a method on the Configuration object.
> > >
> > > I have looked at the documentation and have seen the FactoryCreateRule
> but
> > > I
> > > am not sure how to use this and how I can get it to use the param1 and
> > > param2 elements as the Constructor parameters.
> > >
> > > Once again sorry for the off topic post. Any hints would be
> appreciated.
> > >
> > > Thanks
> > >
> > > Jim.
> >
> > --
> > Kris Schneider <mailto:[EMAIL PROTECTED]>
> > D.O.Tech   <http://www.dotech.com/>

-- 
Kris Schneider <mailto:[EMAIL PROTECTED]>
D.O.Tech   <http://www.dotech.com/>

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Re: [OT] Digester question

[Jim Collins]

Kris,

Thanks for the help.

Jim.
- Original Message -
From: "Kris Schneider" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Monday, August 04, 2003 8:46 PM
Subject: Re: [OT] Digester question


> A bit out of my comfort zone on this one, but I think you might have to
change
> your XML to something like:
>
> 
>   someText
> 
>
> because the FactoryCreateRule/ObjectCreationFactory stuff seems to work
with an
> element's attributes, not its sub-elements. Then it looks like you need to
> subclass AbstractObjectCreationFactory and provode a createObject method
impl
> that will extract the appropriate attribute values and construct your
> Configuration object. I'm sure other folks on the list (or on
commons-user) have
> more experience with this though...
>
> Quoting Jim Collins <[EMAIL PROTECTED]>:
>
> > Appologies for the off topic question. Does anyone know how I can create
an
> > object with a constructor that takes agruments specified via XML
elements.
> >
> > I have a Configuration object with a constructor that takes two String
> > parameters. The XML will be something like this:
> >
> > 
> > someText
> > someText
> > someText
> > 
> >
> > When the digester matches the config pattern it will create the
> > Configuration object passing param1 and param2 as parameters to the
> > constructor and then when it matches the pattern config/saveAs it will
call
> > a method on the Configuration object.
> >
> > I have looked at the documentation and have seen the FactoryCreateRule
but
> > I
> > am not sure how to use this and how I can get it to use the param1 and
> > param2 elements as the Constructor parameters.
> >
> > Once again sorry for the off topic post. Any hints would be appreciated.
> >
> > Thanks
> >
> > Jim.
>
> --
> Kris Schneider <mailto:[EMAIL PROTECTED]>
> D.O.Tech   <http://www.dotech.com/>
>
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>


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Re: [OT] Digester question

[Kris Schneider]

A bit out of my comfort zone on this one, but I think you might have to change
your XML to something like:


  someText


because the FactoryCreateRule/ObjectCreationFactory stuff seems to work with an
element's attributes, not its sub-elements. Then it looks like you need to
subclass AbstractObjectCreationFactory and provode a createObject method impl
that will extract the appropriate attribute values and construct your
Configuration object. I'm sure other folks on the list (or on commons-user) have
more experience with this though...

Quoting Jim Collins <[EMAIL PROTECTED]>:

> Appologies for the off topic question. Does anyone know how I can create an
> object with a constructor that takes agruments specified via XML elements.
> 
> I have a Configuration object with a constructor that takes two String
> parameters. The XML will be something like this:
> 
> 
> someText
> someText
> someText
> 
> 
> When the digester matches the config pattern it will create the
> Configuration object passing param1 and param2 as parameters to the
> constructor and then when it matches the pattern config/saveAs it will call
> a method on the Configuration object.
> 
> I have looked at the documentation and have seen the FactoryCreateRule but
> I
> am not sure how to use this and how I can get it to use the param1 and
> param2 elements as the Constructor parameters.
> 
> Once again sorry for the off topic post. Any hints would be appreciated.
> 
> Thanks
> 
> Jim.

-- 
Kris Schneider 
D.O.Tech   

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OT Digester question

[Jim Collins]

Appologies for the off topic question. Does anyone know how I can create an
object with a constructor that takes agruments specified via XML elements.

I have a Configuration object with a constructor that takes two String
parameters. The XML will be something like this:


someText
someText
someText


When the digester matches the config pattern it will create the
Configuration object passing param1 and param2 as parameters to the
constructor and then when it matches the pattern config/saveAs it will call
a method on the Configuration object.

I have looked at the documentation and have seen the FactoryCreateRule but I
am not sure how to use this and how I can get it to use the param1 and
param2 elements as the Constructor parameters.

Once again sorry for the off topic post. Any hints would be appreciated.

Thanks

Jim.


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Re: Struts Digester question...

[Craig R. McClanahan]

On Mon, 10 Jun 2002, Struts Newsgroup wrote:

> Date: Mon, 10 Jun 2002 01:10:02 -0700
> From: Struts Newsgroup <[EMAIL PROTECTED]>
> Reply-To: Struts Users Mailing List <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Struts Digester question...
>
> Subject: Struts Digester question...
> From: "Scott Curtis" <[EMAIL PROTECTED]>
>  ===
> Hi,
>
> When I start my server and Struts loads I am seeing the following line in
> the console:
>
> register('-//Apache Software Foundation//DTD Struts Configuration 1.0//EN',
> 'classloader:/org/apache/struts/resources/struts-config_1_0.dtd'
>
> I am not 100% sure what this is doing which is the first problem. I guess it
> is somehow adding the DTD to the classpath so that it is accessible from
> within xml files using the dtd name (struts-config_1_0.dtd) rather than a
> full path/URL to the dtd file.
>
> I would like to add my own DTD in a similar way so that xml files that I
> pass into the system can access it by it's name and not require a full path
> to the dtd file. If the above line of code doesn't do what I have suggested
> is there a way to add a DTD in the manner I have suggested so that the xml
> files to be validated against it can reference it by it's name only and not
> the full URL/path?
>
> Hope that makes some sense to someone out there! :-)
>

If you look inside Digester, you will find that that it uses a SAX parser,
via the JAXP APIs.  SAX lets you register an "EntityHandler" object that
is called during the parse when a  is encountered.  As you might
surmize, the registration noted by the log message is telling Digester
"whenever you see the public identifier of the Struts configuration file
DTD, use this copy instead of going out to the Internet."

The important issue, though, is where the second URL came from -- if the
resource is inside your webapp, you *must* ask your servlet container for
the URL of the requested resource.  There are two basic options:

(1) Resource file somewhere within your webapp (i.e. "/WEB-INF/mydtd.dtd")

Digester digester = ...;
digester.register("... public id for my DTD ...",
  context.getResource("/WEB-INF/mydtd.dtd").toString());

(2) Resource file somewhere in the class path (this is what Struts
does ... the DTD it is loading is in the org/apache/struts/resources
package in struts.jar):

Digester digester = ...;
URL url = this.getClass().getResource("/path/to/mydtd.dtd");
digester.register("... public id for my DTD ...",
   url.toString());

As long as your XML documents have a DOCTYPE with a public identifier that
matches the first argument to the register() method, then the XML parser
will use the URL passed as the second argument to retrieve the DTD,
instead of paying attention to any system identifier in the DOCTYPE.


> Thanks
>  - scott
>

Craig


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Struts Digester question...

[@Basebeans.com]

Subject: Struts Digester question...
From: "Scott Curtis" <[EMAIL PROTECTED]>
 ===
Hi,

When I start my server and Struts loads I am seeing the following line in
the console:

register('-//Apache Software Foundation//DTD Struts Configuration 1.0//EN',
'classloader:/org/apache/struts/resources/struts-config_1_0.dtd'

I am not 100% sure what this is doing which is the first problem. I guess it
is somehow adding the DTD to the classpath so that it is accessible from
within xml files using the dtd name (struts-config_1_0.dtd) rather than a
full path/URL to the dtd file.

I would like to add my own DTD in a similar way so that xml files that I
pass into the system can access it by it's name and not require a full path
to the dtd file. If the above line of code doesn't do what I have suggested
is there a way to add a DTD in the manner I have suggested so that the xml
files to be validated against it can reference it by it's name only and not
the full URL/path?

Hope that makes some sense to someone out there! :-)

Thanks
 - scott



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Re: Digester Question

[Steve A Drake]

On Mon, 4 Mar 2002, Craig Tataryn wrote:

> I realize that the digester is now part of commons, but I figure there is
> probably a lot of expertise here since it grew up in Struts.  I was
> wondering if someone could help me figure out the easiest way to do this:
>
> I have an xml document, that holds form data, I would like to use the
> digester to populate my objects automatically.  A form file might look like
> this:
>
> 
>   
>  
>   
>   
>   ...
>   
> ...
> 
>
> Let's assume there are many forms...  I was wondering, without having to
> load all forms into objects and then picking the one I want to use, I would
> rather the digester only instantiate and populate an object for lets say,
> the form node who's type attribute is "calculator".
>
> What's the easiest way to do this?  I don't think the digester can pattern
> match on attribute values the way XPath does, so is there a programming
> technique I can use to filter further?

 Hi Craig. Since, AFAIK, the digester blindly instantiates all of the
implied objects in your database file, I think that you'll need to parse the
database file independently. You might try parsing the database file
using JDOM, extracting the elements that you want and passing that
snippet to the digester. I think that utilizing JDOM, you'll get working
code much faster than you would with raw SAX parsing. I have used
JDOM but I haven't tried utilizing it with the digester - just an idea.


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Re: Digester Question

[Craig Tataryn]

Anyone?



>From: "Craig Tataryn" <[EMAIL PROTECTED]>
>Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Digester Question
>Date: Mon, 04 Mar 2002 14:19:07 -0600
>
>I realize that the digester is now part of commons, but I figure there is
>probably a lot of expertise here since it grew up in Struts.  I was
>wondering if someone could help me figure out the easiest way to do this:
>
>I have an xml document, that holds form data, I would like to use the
>digester to populate my objects automatically.  A form file might look like
>this:
>
>
>  
> 
>  
>  
>  ...
>  
>...
>
>
>Let's assume there are many forms...  I was wondering, without having to
>load all forms into objects and then picking the one I want to use, I would
>rather the digester only instantiate and populate an object for lets say,
>the form node who's type attribute is "calculator".
>
>What's the easiest way to do this?  I don't think the digester can pattern
>match on attribute values the way XPath does, so is there a programming
>technique I can use to filter further?
>
>Thanks,
>
>Craig.
>
>Craig W. Tataryn
>Programmer/Analyst
>Compuware
>
>_
>Chat with friends online, try MSN Messenger: http://messenger.msn.com
>
>
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>


Craig W. Tataryn
Programmer/Analyst
Compuware

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Digester Question

[Craig Tataryn]

I realize that the digester is now part of commons, but I figure there is 
probably a lot of expertise here since it grew up in Struts.  I was 
wondering if someone could help me figure out the easiest way to do this:

I have an xml document, that holds form data, I would like to use the 
digester to populate my objects automatically.  A form file might look like 
this:


  
 
  
  
  ...
  
...


Let's assume there are many forms...  I was wondering, without having to 
load all forms into objects and then picking the one I want to use, I would 
rather the digester only instantiate and populate an object for lets say, 
the form node who's type attribute is "calculator".

What's the easiest way to do this?  I don't think the digester can pattern 
match on attribute values the way XPath does, so is there a programming 
technique I can use to filter further?

Thanks,

Craig.

Craig W. Tataryn
Programmer/Analyst
Compuware

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Re: digester question

[Craig R. McClanahan]

"Gogineni, Pratima" wrote:

> Hi,
>
> I have been reading the documentation on digester - I was wondering if it
> uses XPATH for element pattern matching and if it doesnt why not?
>
> I dont think the documentation mentions this ...
>

That's *usually* a pretty good sign that it doesn't support the feature you
are looking for :-).

Currently, Digester uses a very simple pattern matching algorithm based on
the set of nested elements you are currently processing.  This seemed more
appropriate to the types of problems that Digester was created to solve (like
reading configuration files, or building arbitrary object trees).  However,
XPATH is something that might be interesting to consider for the future.

We're also going to look at XPATH as a way for the Struts custom tags to
access bean properties or navigate DOM objects in the presentation layer.

>
> THanks
> Pratima

Craig

digester question

[Gogineni, Pratima]

Hi,

I have been reading the documentation on digester - I was wondering if it
uses XPATH for element pattern matching and if it doesnt why not?

I dont think the documentation mentions this ...

THanks
Pratima

Digester question

[Matthias Kerkhoff]

Hi all,

my project has a lot of beans, each having a lot of properties. While
writing the all these ever same constructors I've thought about possible
improvements. So I had this idea I would like to use the Digester
to "magically" assign default properties (in ctor and reset) to my
beans. This would be nice because I have less to code and could easily
change the defaults on the fly if required to. Well this is the idea.

How could I achieve this ? (Are there any commented digester examples
doing similar things?) Do I have to think about performance (ok, I
always do, but will it be _significant_ slower (order of magnitudes)
using the digester than doing the assignments with hand-crafted code ?)

Comments ? Bad idea ?

-- 
Matthias  mailto:[EMAIL PROTECTED]