Accessing variables outside of anonymous class

Question

I am currently working with IBM's Speech to Text services included in the IBM Watson java SDK. I am trying to set the transcript String to be equal to the results' transcript. However, when I run this code the value is not printed. I am unsure why this is happening, or how to resolve the issue. Any help would be appreciated. I have tried using an external setter with a static variable outside the main method, but I was unsuccessful.

final String[] transcript = {""};
    service.recognizeUsingWebSocket(options, new BaseRecognizeCallback() {
        @Override
        public void onTranscription(SpeechRecognitionResults speechResults) {
            for(int i = 0; i < speechResults.getResults().size(); i++){
                transcript[0] = transcript[0] + speechResults.getResults().get(i).getAlternatives().get(0).getTranscript() + "\n";
            }
        }
    });
    System.out.println(transcript[0]);

Answer 1

You could wrap your array transcript in a class that has its own handler or consumer ( a way to deal with async requests).

Like so:

import java.util.function.Consumer;

public class ArrayWrapper {

    private Consumer consumer;

    private Object [] array;

    public ArrayWrapper(int size) {
        this.array = new Object [size];
    }

    public void addConsumer(Consumer consumer) {
        this.consumer = consumer;
    }

    public void add(Object o, int index) {
        array[index] = o;
        consumer.accept(o);
    }

    public Object [] get() {
        return array;
    }
}

Then you can just implement your logic inside Consumer:

ArrayWrapper transcript = new ArrayWrapper(1);
transcript.addConsumer(new Consumer() {
    @Override
    public void accept(Object o) {
        // perform your operations 
        System.out.println(o);
    }
});

service.recognizeUsingWebSocket(options, new BaseRecognizeCallback() {
    @Override
    public void onTranscription(SpeechRecognitionResults speechResults) {
        for(int i = 0; i < speechResults.getResults().size(); i++){
            String newTranscript = transcript.get()[0] + speechResults.getResults().get(i).getAlternatives().get(0).getTranscript() + "\n";
            transcript.add(newTranscript, 0);
        }
    }
});

This is just an example, but the idea is that you either have to use a function inside callback, some signal to tell you when loop is done inside callback or something similar.

Edit:

Or you can do this in a simpler way (without any additional classes):

    final String[] transcript = {""};
    Consumer<String> consumer = new Consumer<String>() {
        @Override
        public void accept(String s) {
            //your operations
            System.out.println(s);
        }
    };
    service.recognizeUsingWebSocket(options, new BaseRecognizeCallback() {
        @Override
        public void onTranscription(SpeechRecognitionResults speechResults) {
            for(int i = 0; i < speechResults.getResults().size(); i++){
                transcript[0] = transcript[0] + speechResults.getResults().get(i).getAlternatives().get(0).getTranscript() + "\n";
                consumer.accept(transcript[0]);
            }
        }
    });
}