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Freja eID Client is a client library aimed to ease integration of relying party back-end systems with Freja eID Relying Party API.

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package com.verisec.frejaeid.client.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.verisec.frejaeid.client.exceptions.FrejaEidClientInternalException;
import java.io.IOException;
import java.io.Serializable;
import java.nio.charset.StandardCharsets;

public class JsonService implements Serializable {

    private final ObjectMapper mapper = new ObjectMapper();

    public JsonService() {
        mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
                .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    }

    public  String serializeToJson(T jsonSerializable) throws FrejaEidClientInternalException {
        return serialize(jsonSerializable);
    }

    public  V deserializeFromJson(byte[] bodyBytes, Class responseType) throws FrejaEidClientInternalException {
        return deserialize(bodyBytes, responseType, mapper);
    }

    private  String serialize(T jsonSerializable) throws FrejaEidClientInternalException {
        try {
            return mapper.writeValueAsString(jsonSerializable);
        } catch (JsonProcessingException ex) {
            throw new FrejaEidClientInternalException(String.format("Error while serializing %s. ", jsonSerializable), ex);
        }
    }

    private  T deserialize(byte[] value, Class type, ObjectMapper mapper) throws FrejaEidClientInternalException {
        try {
            return mapper.readValue(value, type);
        } catch (IOException ex) {
            throw new FrejaEidClientInternalException(String.format("Failed to deserialize value %s into object of class %s", new String(value, StandardCharsets.UTF_8), type.getName()), ex);
        }
    }

}