source: SRUAggregator/trunk/src/main/java/eu/clarin/sru/fcs/aggregator/lang/LanguagesISO693_3.java @ 5900

package eu.clarin.sru.fcs.aggregator.lang;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.slf4j.LoggerFactory;

/**
 * Represents collection of languages.
 *
 * @author Yana Panchenko
 */
public class LanguagesISO693_3 {

        private static final org.slf4j.Logger log = LoggerFactory.getLogger(LanguagesISO693_3.class);
        public static final String LANGUAGES_FILE_PATH = "/lang/iso-639-3_20140320.tab";
        public static final String LANGUAGES_FILE_ENCODING = "UTF-8";

        private static LanguagesISO693_3 instance = null;

        public static class Language {

                String code, name;

                public Language(String code, String name) {
                        this.code = code;
                        this.name = name;
                }
        }

        private Map<String, Language> code2Lang = new HashMap<String, Language>();
        private Map<String, Language> name2Lang = new HashMap<String, Language>();

        private LanguagesISO693_3() {
                InputStream is = LanguagesISO693_3.class.getResourceAsStream(LANGUAGES_FILE_PATH);
                try (BufferedReader br = new BufferedReader(new InputStreamReader(is, LANGUAGES_FILE_ENCODING))) {
                        String line;
                        while ((line = br.readLine()) != null) {
                                if (line.length() > 0) {
                                        String[] toks = line.split("\\t");
                                        if (toks.length != 7 && toks.length != 8) {
                                                log.error("Line error in language codes file: ", line);
                                                continue;
                                        }
                                        String code = toks[0];
                                        String name = toks[6];
                                        Language l = new Language(code, name);
                                        code2Lang.put(code, l);
                                        name2Lang.put(name, l);
                                }
                        }
                } catch (IOException ex) {
                        log.error("Initialization of languages code to name mapping failed.", ex);
                }

                ObjectWriter ow = new ObjectMapper().writerWithDefaultPrettyPrinter();
                try {
                        System.out.println(ow.writeValueAsString(code2Lang));
                } catch (JsonProcessingException ex) {
                }
        }

        public static LanguagesISO693_3 getInstance() {
                if (instance == null) {
                        instance = new LanguagesISO693_3();
                }
                return instance;
        }

        public Set<String> getCodes() {
                return code2Lang.keySet();
        }

        public String codeForName(String name) {
                Language l = name2Lang.get(name);
                if (l == null) {
                        log.error("Unknown language name: " + name);
                        return null;
                }
                return l.code;
        }

        public String nameForCode(String code) {
                Language l = code2Lang.get(code);
                if (l == null) {
                        log.error("Unknown language code: " + code);
                        return null;
                }
                return l.name;
        }

}