source: PerfectFit/Dialog/src/main/java/tudelft/mentalhealth/perfectfit/Goals.java

package tudelft.mentalhealth.perfectfit;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.opencsv.CSVParser;
import com.opencsv.CSVParserBuilder;
import com.opencsv.CSVReader;
import com.opencsv.CSVReaderBuilder;

/**
 * The set of example goals. Reads in essentially from goals.csv database.
 * Singleton pattern to avoid re-reading this repeatedly which is useless as the
 * data is immutable.
 * 
 */
public class Goals {
        private static Goals goals = null; // singleton cache

        private final List<GoalLine> lines = new ArrayList<>();

        protected Goals() throws IOException {
                for (String[] line : readAllLines()) {
                        lines.add(new GoalLine(line));
                }
        }

        private List<String[]> readAllLines() throws IOException {
                InputStream stream = getClass().getClassLoader()
                                .getResourceAsStream("examples_with_user_data.csv");

                try (Reader in = new InputStreamReader(stream)) {

                        CSVParser parser = new CSVParserBuilder().withSeparator(',')
                                        .build();
                        // skip the header line
                        CSVReader reader = new CSVReaderBuilder(in).withSkipLines(1)
                                        .withCSVParser(parser).build();

                        return reader.readAll();

                }
        }

        public static Goals instance() throws IOException {
                if (goals == null) {
                        goals = new Goals();
                }
                return goals;
        }

        @Override
        public String toString() {
                return lines.toString();
        }

        public GoalLine get(int nr) {
                return lines.get(nr);
        }

        public List<GoalLine> all() {
                return Collections.unmodifiableList(lines);
        }

}