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From "Michael Joyce (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OODT-627) XMLPS field mapping function attribute names are confusing
Date Tue, 11 Jun 2013 20:23:20 GMT
Michael Joyce created OODT-627:
----------------------------------

             Summary: XMLPS field mapping function attribute names are confusing
                 Key: OODT-627
                 URL: https://issues.apache.org/jira/browse/OODT-627
             Project: OODT
          Issue Type: Improvement
          Components: xmlps
    Affects Versions: 0.5
            Reporter: Michael Joyce
             Fix For: 0.6


In the mapping file we can specify a mapping function to apply to a field. This allows for
semi-complex mappings to be handled easily. However, the current calls in XMLPS result in
the mappings being applied in reverse order (relative from the "expected" direction).

Consider the following mapping that modifies the example config mentioned in the XMLPS Quick
Start Guide [1]. Instead of returning the id as a number we want it as either the string "first"
or "second".

{code:xml}
<field type="dynamic" name="id" dbname="product_id">
  <translate>
    <func class="org.apache.oodt.xmlps.mapping.funcs.ReplaceFunc" orig="1" with="first"
/>
    <func class="org.apache.oodt.xmlps.mapping.funcs.ReplaceFunc" orig="2" with="second"
/>
  </translate>
</field>
{code}

My initial impression is that we're mapping the original value (1 or 2) to the new "with"
values (first or second). With the current implementation this is not the case. We're actually
mapping "first" to 1 and "second" to 2. 

I propose that we change the implementation so the attributes are easier to understand.

[1] https://cwiki.apache.org/confluence/display/OODT/XMLPS+Quick+Start+Guide

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