WikiSignatureExpandFunction.java

package com.aperture_software.glados_wiki.markdown;

import com.aperture_software.glados_wiki.entities.User;
import com.aperture_software.glados_wiki.services.TimeZoneService;
import com.google.common.base.Function;
import com.google.common.base.Optional;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by jhyun on 14. 2. 27.
 * @author jhyun
 */
public class WikiSignatureExpandFunction implements Function<String, String> {

    private SigFunction sigFunction = null;

    private EscapableRegexReplaceFunction rrf = null;

    public WikiSignatureExpandFunction(TimeZoneService timeZoneService, Optional<User> user) {
        sigFunction = new SigFunction(timeZoneService, user);
        rrf = new EscapableRegexReplaceFunction(Pattern.compile("@@@@"), sigFunction, false);
    }

    private static class SigFunction implements Function<Matcher, String> {

        private SigFunction(TimeZoneService timeZoneService, Optional<User> user) {
            this.timeZoneService = timeZoneService;
            this.user = user;
            //
            sig = sig_();
        }

        private TimeZoneService timeZoneService;

        private Optional<User> user;

        private String sig = null;

        private String sig_() {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MMM/dd/EEE HH:mm:ss (z)");
            TimeZone tz = timeZoneService.getDefaultTimeZone();
            String username = "Anonymous";
            if (user.isPresent()) {
                username = user.get().getUsername();
                tz = timeZoneService.getTimeZoneByUsername(username);
            }
            //
            Date dt = Calendar.getInstance(tz).getTime();
            //
            return String.format(" -- %s, %s", username, sdf.format(dt));
        }

        @Override
        public String apply(Matcher input) {
            return sig;
        }
    }

    @Override
    public String apply(String input) {
        return rrf.apply(input);
    }
}