StringStringMapConverter.java

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package org.matsim.utils.objectattributes.attributeconverters;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.MapType;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.matsim.utils.objectattributes.AttributeConverter;

import java.util.Collections;
import java.util.Map;

public class StringStringMapConverter implements AttributeConverter<Map<String, String>> {

    private static final ObjectMapper mapper = new ObjectMapper();
    private static final MapType mapType = TypeFactory.defaultInstance().constructMapType(Map.class, String.class, String.class);

    @Override
    public Map<String, String> convert(String value) {
        try {
            return Collections.unmodifiableMap(mapper.readValue(value, mapType));
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public String convertToString(Object o) {
        try {
            return mapper.writeValueAsString(o);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }
}