Access to Solr parameters from a ValueSource Parser - solr

Question

So I have this class:
public class CustomValueSourceParser extends ValueSourceParser {
#Override
public ValueSource parse(FunctionQParser fqp) throws ParseException {
...
List<ValueSource> valSources = fqp.parseValueSourceList();
String iComeFromTheSolrFunctionArguments =
((LiteralValueSource)valSources.get(0)).getValue();
String iComeFromTheSolrQuery;
return new CustomValueSource(iComeFromTheSolrQuery, iComeFromTheSolrFunctionArguments);
}
}
I'd like to take the variable iComeFromTheSolrQuery from the solr query itself--not from the function arguments (because I will be calling the function multiple times and this string is very large).
Is there a way to do this? I tried adding a field to the search criteria, and then calling fqp.getParams(FIELD_NAME), but nothing came through.
Ideas?

Answer 1

Figured it out. What I wanted was to add a paramater. Not a field. When Formulating the query, I did this:
ModifiableSolrParams params = new ModifiableSolrParams();
params.set(PARAM_NAME_CONSTANT, paramValueString);
solrQuery.add(params);
Then in the above code I got the parameter like this:
public class CustomValueSourceParser extends ValueSourceParser {
#Override
public ValueSource parse(FunctionQParser fqp) throws ParseException {
...
List<ValueSource> valSources = fqp.parseValueSourceList();
String iComeFromTheSolrFunctionArguments =
((LiteralValueSource)valSources.get(0)).getValue();
String iComeFromTheSolrQuery=fqp.getParam(PARAM_NAME_CONSTANT);
return new CustomValueSource(iComeFromTheSolrQuery, iComeFromTheSolrFunctionArguments);
}
}