/**
* Takes the actual arguments and returns the result. Gets passed the input, does whatever it
* wants to it, and then returns the output.
*
* <p>The input is accessed using the ObjectInspectors that were saved into global variables in
* the call to initialize()
*
* <p>This method is called once for every row of data being processed. UDFs are called during the
* map phase of the MapReduce job. This means that we have no control over the order in which the
* records get sent to the UDF.
*
* @param arguments
* @return
* @throws HiveException
*/
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
assert arguments != null
: "Method 'evaluate' of HostNormalizerUDF " + "called with null arguments array";
assert arguments.length == 1
: "Method 'evaluate' of "
+ "HostNormalizerUDF called arguments of length "
+ arguments.length
+ " (instead of 1)";
// arguments is an array with exactly 1 entry.
assert result != null : "Result object has not yet been initialized, " + "but evaluate called";
// result object has been initialized. So it's an array of objects of
// the right length.
String uriHost = argumentOI.getPrimitiveJavaObject(arguments[0].get());
NormalizedHostInfo normHost = webrequest.normalizeHost(uriHost);
if (normHost == null) {
result[IDX_PROJECT_CLASS] = NormalizedHostInfo.EMPTY_NORM_HOST_VALUE;
result[IDX_PROJECT] = NormalizedHostInfo.EMPTY_NORM_HOST_VALUE;
result[IDX_QUALIFIERS] = new ArrayList<String>();
result[IDX_TLD] = NormalizedHostInfo.EMPTY_NORM_HOST_VALUE;
} else {
result[IDX_PROJECT_CLASS] = normHost.getProjectClass();
result[IDX_PROJECT] = normHost.getProject();
result[IDX_QUALIFIERS] = normHost.getQualifiers();
result[IDX_TLD] = normHost.getTld();
}
return result;
}
