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Java implementation of JSON Web Token (JWT)

There is a newer version: 4.4.0

package com.auth0.jwt.impl;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

import java.io.IOException;
import java.util.Date;
import java.util.Map;

/**
 * Jackson serializer implementation for converting into JWT Payload parts.
 *
 * @see com.auth0.jwt.JWTCreator
 * 
 * This class is thread-safe.
 */
public class PayloadSerializer extends StdSerializer {

    public PayloadSerializer() {
        this(null);
    }

    private PayloadSerializer(Class t) {
        super(t);
    }

    @Override
    public void serialize(ClaimsHolder holder, JsonGenerator gen, SerializerProvider provider) throws IOException {

        gen.writeStartObject();
        for (Map.Entry e : holder.getClaims().entrySet()) {
            switch (e.getKey()) {
                case PublicClaims.AUDIENCE:
                    if (e.getValue() instanceof String) {
                        gen.writeFieldName(e.getKey());
                        gen.writeString((String) e.getValue());
                        break;
                    }
                    String[] audArray = (String[]) e.getValue();
                    if (audArray.length == 1) {
                        gen.writeFieldName(e.getKey());
                        gen.writeString(audArray[0]);
                    } else if (audArray.length > 1) {
                        gen.writeFieldName(e.getKey());
                        gen.writeStartArray();
                        for (String aud : audArray) {
                            gen.writeString(aud);
                        }
                        gen.writeEndArray();
                    }
                    break;
                default:
                    gen.writeFieldName(e.getKey());
                    if (e.getValue() instanceof Date) { // true for EXPIRES_AT, ISSUED_AT, NOT_BEFORE
                        gen.writeNumber(dateToSeconds((Date) e.getValue()));
                    } else {
                        gen.writeObject(e.getValue());
                    }
                    break;
            }
        }

        gen.writeEndObject();
    }

    private long dateToSeconds(Date date) {
        return date.getTime() / 1000;
    }
}