Hi
I have got the behaviour I want by extending the CallMethodRule as per the
code below (basically setting the bodyText to the element name). Then
configuring it as
digester.addCallMethod("FXTRADE/sale_ccy", "addCurrencyMapping", 2);
digester.addCallParam("FXTRADE/sale_ccy", 0);
digester.addRule("FXTRADE/sale_ccy", new ElementNameParamRule(1));
My question is really given my two days experience of Digester, Is this a
sensible solution.
package org.apache.commons.digester;
import java.lang.reflect.Method;
import org.xml.sax.Attributes;
/**
* Rule implementation that saves a parameter from either an attribute of
* this element, or from the element body, to be used in a call generated
* by a surrounding CallMethodRule rule.
*
* @author Craig McClanahan
* @version $Revision: 1.7 $ $Date: 2002/03/23 17:45:57 $
*/
public class ElementNameParamRule extends CallParamRule {
// -----------------------------------------------------------
Constructors
/**
* Construct a "call parameter" rule that will save the body text of
this
* element as the parameter value.
*
* @param paramIndex The zero-relative parameter number
*/
public ElementNameParamRule(int paramIndex) {
super(paramIndex);
}
/**
* Construct a "call parameter" rule that will save the value of the
* specified attribute as the parameter value.
*
* @param paramIndex The zero-relative parameter number
* @param attributeName The name of the attribute to save
*/
public ElementNameParamRule(int paramIndex,
String attributeName) {
super (paramIndex, attributeName);
}
// --------------------------------------------------------- Public
Methods
/**
* Process the start of this element.
*
* @param attributes The attribute list for this element
*/
public void begin(Attributes attributes) throws Exception {
if (attributeName != null) {
bodyText = digester.getCurrentElementName();
}
}
/**
* Render a printable version of this Rule.
*/
public String toString() {
StringBuffer sb = new StringBuffer("ElementNameParamRule[");
sb.append("paramIndex=");
sb.append(paramIndex);
sb.append(", attributeName=");
sb.append(attributeName);
sb.append("]");
return (sb.toString());
}
}
:-) Tom Lister
Technical Architecture Group
* - 020 7756 5014
* - [EMAIL PROTECTED]
-----Original Message-----
From: Simon Kitching [mailto:[EMAIL PROTECTED]
Sent: 09 July 2003 00:25
To: Jakarta Commons Users List
Subject: Re: [Digester] element names
On Wed, 2003-07-09 at 04:54, Lister, Tom (ANTS) wrote:
> Hi
> I'm need to parse an XML document and cross reference selected elements
with
> a mapping database to resolve different naming conventions between
systems.
> We are using XML via MQ for real time integration.
>
> My problem is that when I get the content of an element to call a mapping
> method call, I also want to pass the name of the element as a second
> parameter to the method. I can't see a way to get this information.
> Alternatively a way to pass in a hard coded parameter would also work as I
> know which elements I am defining rules for.
>
> I can't see any way to pass parameters to a method call other than element
> contents - or have I missed something basic.
>
> Do I need to build a custom rule for this?
I don't think what you want to do can be accomplished without extending
Digester in one way or another.
Digester class has a getCurrentElementName() method.
The Rule class (which is extended by every type of Rule) has a
getDigester() method. So yes I think you could write a custom rule which
passes the element name.
Your suggestion about passing a constant string as a parameter also
sounds reasonable but as far as I am aware, CallMethodRule/CallParamRule
do not currently support passing constants as parameters. I think that
this feature would be a nice addition to Digester; eg adding a new
constructor:
public CallParamRule(int paramIndex, Object paramObj)
If you did implement constant parameters, I think it would be a good
candidate for inclusion in Digester (not that my opinion counts for
anything :-).
Cheers,
Simon
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