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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.util;

import com.google.gson.*;
import com.google.gson.internal.bind.JsonTreeReader;
import com.google.gson.internal.bind.JsonTreeWriter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

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

/**
 * Created by julio on 8/18/16.
 */
public class JsonUtils {

    private JsonUtils() {

    }

    /**
     * Copies all the property values from the supplied {@link JsonElement}. This method is similar to
     * {@link JsonElement#deepCopy()}. We are not using {@link JsonElement#deepCopy()} because it is not public
     * @param from
     * @return
     */
    public static JsonElement deepCopy(JsonElement from) {
        if(from.isJsonObject()) {
            JsonObject result = new JsonObject();
            for(Map.Entry entry: from.getAsJsonObject().entrySet()) {
                result.add(entry.getKey(), deepCopy(entry.getValue()));
            }
            return result;
        } else if(from.isJsonArray()) {
            JsonArray result = new JsonArray();
            for(JsonElement element: from.getAsJsonArray()) {
                result.add(element);
            }
            return result;
        } else if(from.isJsonPrimitive()) {
            return from;
        } else if(from.isJsonNull()) {
            return from;
        } else {
            return JsonNull.INSTANCE;
        }
    }

    public static JsonElement toJsonTree(TypeAdapter typeAdapter, JsonWriter optionsFrom, Object value) throws IOException {
        JsonTreeWriter jsonTreeWriter = new JsonTreeWriter();
        jsonTreeWriter.setLenient(optionsFrom.isLenient());
        jsonTreeWriter.setHtmlSafe(optionsFrom.isHtmlSafe());
        jsonTreeWriter.setSerializeNulls(optionsFrom.getSerializeNulls());
        typeAdapter.write(jsonTreeWriter, value);
        return jsonTreeWriter.get();
    }

    public static  T fromJsonTree(TypeAdapter typeAdapter, JsonReader originalReader, JsonElement element) throws IOException {
        JsonTreeReader jsonTreeReader = new JsonTreeReader(element);
        jsonTreeReader.setLenient(originalReader.isLenient());
        return typeAdapter.read(jsonTreeReader);
    }

}