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A java library that adds some very useful features to Gson, like Date serializing to unix timestamp or RFC3339, method (getter) serialization, pre and post processors and many more. Check out the documentation to learn how to use it!

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package io.gsonfire.postprocessors;

import io.gsonfire.PostProcessor;
import io.gsonfire.annotations.MergeMap;
import io.gsonfire.gson.FieldInspector;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

import java.lang.reflect.Field;
import java.util.Map;

/**
 * @autor: julio
 */
@Deprecated
public class MergeMapPostProcessor implements PostProcessor {

    private FieldInspector fieldInspector = new FieldInspector();

    @Override
    public void postDeserialize(Object result, JsonElement src, Gson gson) {
        //nothing
    }

    @Override
    public void postSerialize(JsonElement result, Object src, Gson gson) {
        if(src == null){
            return;
        }
        for(Field f: fieldInspector.getAnnotatedFields(src.getClass(), MergeMap.class)){
            try {
                Map map = (Map)f.get(src);
                JsonObject resultJsonObject = result.getAsJsonObject();

                //Walk the map and merge it with the json object
                for (Map.Entry entry: gson.toJsonTree(map).getAsJsonObject().entrySet()){
                    resultJsonObject.add(entry.getKey(), entry.getValue());
                }
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }
    }
}