/** Generate external process results (if they have not already been generated). */
@Override
public void prepare(ResponseBuilder rb) throws IOException {
SolrParams params = rb.req.getParams();
if (!params.getBool(getName(), false)) {
return;
}
XJoinResults<?> results = (XJoinResults<?>) rb.req.getContext().get(getResultsTag());
if (results != null) {
return;
}
// generate external process results, by passing 'external' prefixed parameters
// from the query string to our factory
String prefix = getName() + "." + XJoinParameters.EXTERNAL_PREFIX + ".";
ModifiableSolrParams externalParams = new ModifiableSolrParams();
for (Iterator<String> it = params.getParameterNamesIterator(); it.hasNext(); ) {
String name = it.next();
if (name.startsWith(prefix)) {
externalParams.set(name.substring(prefix.length()), params.get(name));
}
}
results = factory.getResults(externalParams);
rb.req.getContext().put(getResultsTag(), results);
}
/**
* Initialise the component by instantiating our factory class, and initialising the join field.
*/
@Override
@SuppressWarnings("rawtypes")
public void init(NamedList args) {
super.init(args);
try {
Class<?> factoryClass =
Class.forName((String) args.get(XJoinParameters.INIT_RESULTS_FACTORY));
factory = (XJoinResultsFactory<?>) factoryClass.newInstance();
factory.init((NamedList) args.get(XJoinParameters.EXTERNAL_PREFIX));
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e);
}
joinField = (String) args.get(XJoinParameters.INIT_JOIN_FIELD);
}
