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From Gilles Gaillard <gillesGaill...@compuserve.com>
Subject Re: [digester] 20903 - CallFactoryMethodRule
Date Thu, 03 Feb 2005 16:11:12 GMT
Sorry for the bad formatting, corrected inline.

> Hi Simon,
>
> There are some cases where you know the objects being present on the
> Digester's stack. In this case, you would like to be able to access 
> them directly so that you can call their methods and pass them 
> parameters that are present in the xml attributes.
>
> With further refinement, you would also like to pass to them parameters
> that are objects that are already present on the stack. Then once, the 
> call return, you would like to push (or not) the result on the stack.
>
> This is what the CallFactoryMethodRule does.
> It is a digester rule that enables to define the caller of the method,
> the name of the method and its parameters. The the result of the call
> can be pushed on the stack.
>
> The following is an excerpt of a xml digester usage of the rule: 

  <pattern value="employee">
    <call-factory-method-rule
      methodname="createEmployee"
      paramtypes="string,string"
      paramnames="firstName,lastName" pushit="true"/>
      <set-next-rule methodname="setModel"/>
    <pattern value="address">
      <call-factory-method-rule
        methodname="createAddress"
        caller="root"
        paramtypes="string,string,string,string"
        paramnames="street,city,state,zipCode"
        pushit="true"/>
      <call-factory-method-rule
        methodname="setType"
        paramtypes="string"
        paramnames="type"/>
      <set-next-rule methodname="addAddress"/>
    </pattern>
  </pattern>

>
> There is a more detailled presentation of this in the header of class
> CallFactoryMethodRule.
> Regards,
>
> Gilles
>
>
>> http://issues.apache.org/bugzilla/show_bug.cgi?id=20903
>>
>> Hi Gilles,
>>
>> Sorry it took so long to get around to having a look at this bugzilla 
>> entry.
>>
>> A lot of work has clearly gone into the attached code. However I 
>> don't really
>> understand what the purpose of it is...and send a summary of what 
>> this code
>> achieves, so that we can all discuss this patch? ..
>> I am concerned about the significant complexity of the code (as will 
>> other
>> digester maintainers), and so would like to understand what benefits 
>> users would
>> gain by having this CallFactoryMethodRule available....
>>
>> Thanks for your offer of this code, and hope to see your email soon.
>>
>> Regards,
>>
>> Simon
>>  
>>
>


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