Extending default ViewCriteriaAdapter behavior

hi
I am looking for an easy way to change the ViewCriteria behavior for one (type of) field and keep the default behavior for the other fields.
I would like this
vMyViewCriteriaRow.setAttribute("REG_DATE", "05-2005");to result in a where clause fragment like
(REG_DATE >= TO_DATE('01-05-2005', 'DD-MM-YYYY') AND REG_DATE < TO_DATE('01-06-2005', 'DD-MM-YYYY'))or like
(REG_DATE BETWEEN TO_DATE('01-05-2005', 'DD-MM-YYYY') AND (TO_DATE('01-06-2005', 'DD-MM-YYYY') - 1))or something else, for whatever reason
I've read
"Implementing a View Criteria Adapter to Customize Query By Example Functionality"
http://radio.weblogs.com/0118231/stories/2003/07/11/implementingAViewCriteriaAdapterToCustomizeQueryByExampleFunctionality.html
but it doesn't describe how to keep some of the default behavior.
My solution (for now) is based on this article though:
public class DateViewCriteriaAdapter extends OracleSQLBuilderImpl
     public String getViewCriteriaClause(ViewObject pViewObject,
          ViewCriteria pViewCriteria)
          if (pViewCriteria == null || pViewCriteria.size() == 0)
               return null;
          ViewCriteria vModifiedViewCriteria = pViewCriteria;
          StringBuffer vCustomFragment = new StringBuffer();
          if (pViewCriteria.size() == 1)
               vModifiedViewCriteria = pViewObject.createViewCriteria();
               ViewCriteriaRow vModifiedVCRow =
                    vModifiedViewCriteria.createViewCriteriaRow();
               vModifiedViewCriteria.add(vModifiedVCRow);
               ViewCriteriaRow vVCRow = (ViewCriteriaRow)pViewCriteria.first();
               StructureDef vStructureDef = vVCRow.getStructureDef();
               AttributeDef[] vAttributeDefs = vStructureDef.getAttributeDefs();
               for (int i = 0, vLength = vAttributeDefs.length; i < vLength; i++)
                    String vCriteriaAttVal = (String)vVCRow.getAttribute(i);
                    if (vCriteriaAttVal != null && !"".equals(vCriteriaAttVal))
                         String vAttributeFragment = getWhereClauseFragmentForAttribute(
                              vAttributeDefs, vCriteriaAttVal);
                         if (vAttributeFragment != null)
                              appendFragment(vCustomFragment, vAttributeFragment);
                         else
                              vModifiedVCRow.setAttribute(i, vCriteriaAttVal);
          String vDefaultFragment = super.getViewCriteriaClause(
               pViewObject, vModifiedViewCriteria);
          appendFragment(vCustomFragment, vDefaultFragment);
          return "( " + vCustomFragment.toString() + " )";
     private String getWhereClauseFragmentForAttribute(AttributeDef pAttributeDef,
          String pCriteriaAttVal)
          String vCriteriaAttVal = pCriteriaAttVal.trim();
          if (pAttributeDef.getJavaType() == oracle.jbo.domain.Date.class)
          return null;
I'm not really happy with this solution because:
(1) It extends OracleSQLBuilderImpl which extends BaseSQLBuilderImpl for which the API documentation states "Internal: Applications should not use this interface.", so I'm not sure if I'm supposed to extend OracleSQLBuilderImpl.
(2) It only works for ViewCriteria with one ViewCriteriaRow. As this solution depends on a call to super.getViewCriteriaClause(), there is no way to correctly "AND and OR" all (custom and default) fragments together.
my question:
Is this the way to go, or should I use another aproach?
thanks
Jan Vervecken

Thanks for your reply Steve.
It took me a while, but I've been able to get an enhancement request logged for this, see metalink.oracle.com (search bugs for this number):
4651343 : EXTENDING DEFAULT VIEWCRITERIAADAPTER BEHAVIOR
Although I don't know about the other values the "Desirability" attribute of this enhancement request can have, I don't agree with "Somewhat desirable feature".
Because it enables both "productivity" and "choice", I believe it deserves a stronger desirability-status.
greetings
Jan Vervecken

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