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Base functionality for leanIX dropwizard-based services

There is a newer version: 2.0.10

package net.leanix.dropkit.api;

import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.dropwizard.jackson.Jackson;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Represents a generic map-like payload class.
 *
 *
 */
@JsonInclude(JsonInclude.Include.ALWAYS)
public class Payload {

    private static final ObjectMapper MAPPER = Jackson.newObjectMapper();

    private final Map fields = new HashMap<>();

    public static Payload fromObject(Object o) {
        if (o == null) {
            return new Payload();
        }

        String encoded;
        try {
            encoded = MAPPER.writeValueAsString(o);
        } catch (JsonProcessingException ex) {
            Logger.getLogger(Payload.class.getName()).log(Level.WARNING, "Transformation from object failed.", ex);
            return new Payload();
        }

        return fromString(encoded);
    }

    public static Payload fromString(String encoded) {
        try {
            return MAPPER.readValue(encoded, Payload.class);
        } catch (IOException ex) {
            Logger.getLogger(Payload.class.getName()).log(Level.WARNING, "Deserialization from string failed", ex);
            return new Payload();
        }
    }

    @Override
    public String toString() {
        try {
            return MAPPER.writeValueAsString(toMap());
        } catch (JsonProcessingException ex) {
            Logger.getLogger(Payload.class.getName()).log(Level.WARNING, "Serialization to string failed", ex);
            return null;
        }
    }

    /**
     * Returns the internal map.
     *
     * @return
     */
    public Map toMap() {
        return fields;
    }

    /**
     * Setter.
     *
     * @param key
     * @param value
     */
    @JsonAnySetter
    public void setKey(String key, Object value) {
        fields.put(key, value);
    }

    /**
     * Getter.
     *
     * @param key
     * @return
     */
    @JsonAnyGetter
    public Object getKey(String key) {
        if (!fields.containsKey(key)) {
            return null;
        }

        return fields.get(key);
    }
}