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Java sdk for Dapps interact with cwv blockchain node

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/*
   Copyright 2019 Evan Saulpaugh

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
package org.brewchain.sdk.contract.abi.util;

import com.google.gson.*;

public final class JsonUtils {

    public static JsonElement parse(String json) {
        return new JsonParser().parse(json);
    }

    public static JsonObject parseObject(String json) {
        return parse(json).getAsJsonObject();
    }

    public static JsonArray parseArray(String json) {
        return parse(json).getAsJsonArray();
    }

    public static String getString(JsonObject object, String key) {
        return getString(object, key, null);
    }

    public static boolean getBoolean(JsonObject object, String key) {
        return getBoolean(object, key, null);
    }

    public static JsonArray getArray(JsonObject object, String key) {
        return getArray(object, key, null);
    }

    public static String getString(JsonObject object, String key, String defaultVal) {
        JsonElement element = object.get(key);
        if(element == null || element.isJsonNull()) {
            return defaultVal;
        }
        if(!element.isJsonPrimitive() || !((JsonPrimitive) element).isString()) {
            throw new IllegalArgumentException(key + " is not a string");
        }
        return element.getAsString();
    }

    public static boolean getBoolean(JsonObject object, String key, Boolean defaultVal) {
        JsonElement element = object.get(key);
        if(element == null || element.isJsonNull()) {
            return defaultVal;
        }
        if(!element.isJsonPrimitive() || !((JsonPrimitive) element).isBoolean()) {
            throw new IllegalArgumentException(key + " is not a primitive");
        }
        return element.getAsBoolean();
    }

    public static JsonArray getArray(JsonObject object, String key, JsonArray defaultVal) {
        JsonElement element = object.get(key);
        if (element == null || element.isJsonNull()) {
            return defaultVal;
        }
        if (!element.isJsonArray()) {
            throw new IllegalArgumentException(key + " is not an array");
        }
        return element.getAsJsonArray();
    }
}