How to Swap out Data Sets at runtime

I would like to swap data sets at run time, dependent on whether certain parameters are presented. I can code this in an init handler. I have seen some examples, but the big issue is joined datasets. I would need to swap out one of the referenced datasets from the joined dataset, with the assumption that it both queries are similar and compatible

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vinnar

Using a 'beforeFactory' script to call one dataset or the other conditionally could be useful? 
Like - 
 
if (BirtComp.notEqual(params["Condition1"], true )) { 
datasetTable = reportContext.getReportRunnable().designHandle.getDesignHandle().findElement("Certificate"); 
datasetTable.setProperty( "dataSet", "cert-N" ); 
} 
 
 
 
<blockquote class='ipsBlockquote' data-author="'cjnoyes'" data-cid="98514" data-time="1333463689" data-date="03 April 2012 - 07:34 AM">
I would like to swap data sets at run time, dependent on whether certain parameters are presented. I can code this in an init handler. I have seen some examples, but the big issue is joined datasets. I would need to swap out one of the referenced datasets from the joined dataset, with the assumption that it both queries are similar and compatible </blockquote>