jopt simple value converter

Pokus.java

import joptsimple.ValueConverter;

import java.util.HashMap;
import java.util.Map;

import static org.springframework.core.GenericTypeResolver.resolveTypeArgument;

public class Pokus {

    public static void main(String... args) {
        System.out.println(new PokusConverter().valueType());
        System.out.println(new SpringConverter().valueType());
    }

    public static class PokusConverter implements ValueConverter<Map<String, Integer>> {

        private static final Map<String, Integer> TYPE = new HashMap<String, Integer>();

        public Map<String, Integer> convert(final String s) {
            return null;
        }

        @SuppressWarnings("unchecked")
        public Class<? extends Map<String, Integer>> valueType() {
            return (Class<? extends Map<String, Integer>>) TYPE.getClass();
        }

        public String valuePattern() {
            return null;
        }
    }

    public static class SpringConverter implements ValueConverter<Map<String, Integer>> {

        public Map<String, Integer> convert(final String s) {
            return null;
        }

        @SuppressWarnings("unchecked")
        public Class<? extends Map<String, Integer>> valueType() {
            return (Class<? extends Map<String, Integer>>) resolveTypeArgument(getClass(), ValueConverter.class);
        }

        public String valuePattern() {
            return null;
        }
    }
}