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From: tslusser@InPhact.com
To: commons-user@jakarta.apache.org
Subject: RE: Digester: Cannot get <call-param-rule> to parse?
Date: Mon, 24 Mar 2003 09:45:21 -0600
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I think you are wanting something like this...

xml to parse:

<?xml version="1.0"?>
<Context>
  <ResourceParams name="jdbc/db2" value="foo">
    <parameter>
      <name>factory</name>
      <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>
  </ResourceParams>
</Context>

rules file:

<?xml version="1.0"?>
<digester-rules>
  <pattern value="Context/ResourceParams">
    <object-create-rule
      classname="com.merck.common.rcpool.deploy.ResourceParams"/>
    <set-properties-rule>
      <alias attr-name="name" prop-name="name"/>
    </set-properties-rule>
    <pattern value="parameter">
      <call-method-rule methodname="addParameter" paramcount="2"/>
      <call-param-rule pattern="name" paramnumber="0" />
      <call-param-rule pattern="value" paramnumber="1" />
    </pattern>
  </pattern>
</digester-rules>

ResourceParams.java:
...
public void setName(String name)
{
  this.name = name;	// this will hold the jdbc/db2 value
}

public void addParameter(String name, String value)
{
  setValue(name + "=" + value);  // this will hold the factory=...
}
...

Hope this helps!

Ted-

-----Original Message-----
From: Lafredo, Stephen [mailto:stephen_lafredo@merck.com]
Sent: Monday, March 24, 2003 8:53 AM
To: 'Jakarta Commons Users List'
Subject: RE: Digester: Cannot get <call-param-rule> to parse?


Hi,

I have the following configured w/in my rules file...

...
  <pattern value="Context/ResourceParams">

    <object-create-rule
classname="com.merck.common.rcpool.deploy.ResourceParams"
                         attrname="resourcesParameters"/>

    <!-- map the element's XML attributes to the bean properties -->
    <set-properties-rule>
      <alias attr-name="name" prop-name="name" />
    </set-properties-rule>

    <call-method-rule methodname="addParameter" paramcount="2" />
    <call-param-rule paramnumber="0" attrname="name" />
    <call-param-rule paramnumber="1" attrname="value"  />

  </pattern>
...

This is the portion of the xml file I am parsing...

  <ResourceParams name="jdbc/db2" value="foo">
    <parameter>
      <name>factory</name>
      <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>
  </ResourceParams>

When the rules file is configured as described above the "ResourceParams"
ATTRIBUTES and not the contained "parameter" ELEMENTS are being parsed!

This is the sample output...

ResourceParams[name=jdbc/db2, parameters={jdbc/db2=foo}]

What I am expecting is...

ResourceParams[name=jdbc/db2,
parameters={factory=org.apache.commons.dbcp.BasicDataSourceFactory}]

Am I misunderstanding the functionality of call-method-rule?

Thank you.

Stephen Lafredo


-----Original Message-----

Hi,

I have corrected the rules file as described below but I am still getting an
error when I try to specify a method w/parameters?

Mar 24, 2003 9:03:29 AM org.apache.commons.digester.Digester peekParams
WARNING: Empty stack (returning null) 
Mar 24, 2003 9:03:29 AM org.apache.commons.digester.Digester startElement
SEVERE: Begin event threw exception java.lang.NullPointerException
 	at
org.apache.commons.digester.CallParamRule.begin(CallParamRule.java:232)
 	at org.apache.commons.digester.Rule.begin(Rule.java:200) 

...

java.lang.NullPointerException
 	at
org.apache.commons.digester.Digester.createSAXException(Digester.java:2383)
at
org.apache.commons.digester.Digester.createSAXException(Digester.java:2409)
at org.apache.commons.digester.Digester.startElement(Digester.java:1271) 

The release notes suggests that this functionality has been implemented but
is it?

Any suggestions?

Thank you.

Stephen Lafredo


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