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

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

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

    private final FieldInspector fieldInspector;

    public MergeMapPostProcessor(FieldInspector fieldInspector) {
        this.fieldInspector = 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.getAnnotatedMembers(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);
            }
        }
    }
}