Implementation of callback-method on_data_available() of HelloSubscriber

HelloSubscriberCallbackMethod.java

public void on_data_available(DataReader reader) {

// Method Parameter of Type DataReader must be cast to Data Type of DataReader for this Topic
StringDataReader stringReader = (StringDataReader) reader;
SampleInfo info = new SampleInfo();
      	
for (;;) {
try {
	String sample = stringReader.take_next_sample(info);
    if (info.valid_data) {
	System.out.println(sample);
        
	if (sample.equals("")) {
          	shutdown_flag = true;
	}
    }
} 
catch (RETCODE_NO_DATA noData) {
	// No more data to read
	break;
	} 
catch (RETCODE_ERROR e) {
	// An error occurred
	e.printStackTrace();
    }
}}}