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RePlay is a fork of the Play1 framework, created by Codeborne.
There is a newer version: 2.6.2
package play.utils;

import play.Play;

import javax.annotation.Nullable;
import javax.annotation.ParametersAreNonnullByDefault;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static java.util.stream.Collectors.joining;

@ParametersAreNonnullByDefault
public class Utils {

    public static  String join(T[] values, String separator) {
        if (values.length == 0) {
            return "";
        }

        return Stream.of(values).map(Object::toString).collect(joining(separator));
    }

    public static class Maps {

        public static void mergeValueInMap(Map map, String name, @Nullable String value) {
            String[] newValues;
            String[] oldValues = map.get(name);
            if (oldValues == null) {
                newValues = new String[1];
                newValues[0] = value;
            } else {
                newValues = new String[oldValues.length + 1];
                System.arraycopy(oldValues, 0, newValues, 0, oldValues.length);
                newValues[oldValues.length] = value;
            }
            map.put(name, newValues);
        }

        public static void mergeValueInMap(Map map, String name, String[] values) {
            for (String value : values) {
                mergeValueInMap(map, name, value);
            }
        }

        public static  Map filterMap(Map map, String keypattern) {
            try {
                @SuppressWarnings("unchecked")
                Map filtered = map.getClass().getDeclaredConstructor().newInstance();
                for (Map.Entry entry : map.entrySet()) {
                    K key = entry.getKey();
                    if (key.toString().matches(keypattern)) {
                        filtered.put(key, entry.getValue());
                    }
                }
                return filtered;
            } catch (Exception iex) {
                throw new RuntimeException("Failed to create " + map.getClass().getName(), iex);
            }
        }
    }

    private static final ThreadLocal httpFormatter = new ThreadLocal<>();

    public static SimpleDateFormat getHttpDateFormatter() {
        if (httpFormatter.get() == null) {
            httpFormatter.set(new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US));
            httpFormatter.get().setTimeZone(TimeZone.getTimeZone("GMT"));
        }
        return httpFormatter.get();
    }

    public static class AlternativeDateFormat {
        private final List formats;

        private AlternativeDateFormat(Locale locale, String... alternativeFormats) {
            formats = Stream.of(alternativeFormats)
              .map(format -> new SimpleDateFormat(format, locale))
              .collect(Collectors.toList());
        }

        public Date parse(String source) throws ParseException {
            for (SimpleDateFormat dateFormat : formats) {
                if (source.length() == dateFormat.toPattern().replace("'", "").length()) {
                    try {
                        return dateFormat.parse(source);
                    }
                    catch (ParseException ignore) {
                    }
                }
            }
            throw new ParseException("Date format not understood: " + source, 0);
        }

        private static final ThreadLocal dateformat = new ThreadLocal<>();

        public static AlternativeDateFormat getDefaultFormatter() {
            if (dateformat.get() == null) {
                dateformat.set(new AlternativeDateFormat(Locale.US, "yyyy-MM-dd'T'HH:mm:ss'Z'", // ISO8601 + timezone
                  "yyyy-MM-dd'T'HH:mm:ss", // ISO8601
                  "yyyy-MM-dd HH:mm:ss", "yyyyMMdd HHmmss", "yyyy-MM-dd", "yyyyMMdd'T'HHmmss", "yyyyMMddHHmmss", "dd'/'MM'/'yyyy",
                  "dd-MM-yyyy", "dd'/'MM'/'yyyy HH:mm:ss", "dd-MM-yyyy HH:mm:ss", "ddMMyyyy HHmmss", "ddMMyyyy"));
            }
            return dateformat.get();
        }
    }

    public static String urlDecodePath(@Nullable String enc) {
        return enc == null ? null : URLDecoder.decode(enc.replaceAll("\\+", "%2B"), Play.defaultWebEncoding);
    }

    public static String urlEncodePath(String plain) {
        return URLEncoder.encode(plain, Play.defaultWebEncoding);
    }
}