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@Override public void declareOutputFields(OutputFieldsDeclarer declarer) { String[] outputFieldNames = new String[outputFields.length]; for (int i = 0; i < outputFields.length; ++i) { outputFieldNames[i] = outputFields[i].getOutputName(); } if (outputStreamName != null) { declarer.declareStream(outputStreamName, new Fields(outputFieldNames)); } else { declarer.declare(new Fields(outputFieldNames)); } }