geometry-tower-defense/Assets/GameMain/Scripts/Definition/EventRequirementFactory.cs

using GeometryTD.CustomUtility;
using Newtonsoft.Json.Linq;
using UnityGameFramework.Runtime;

namespace GeometryTD.Definition
{
    public static class EventRequirementFactory
    {
        public static EventRequirementBase Create(string rawType, JObject param)
        {
            if (string.IsNullOrWhiteSpace(rawType))
            {
                return null;
            }

            EventRequirementType type = EnumUtility<EventRequirementType>.Get(rawType);
            switch (type)
            {
                case EventRequirementType.GoldAtLeast:
                {
                    int count = GetInt(param, "Count", "Gold");
                    return new GoldAtLeastRequirement(new GoldAtLeastParam(count));
                }
                case EventRequirementType.CompCountAtLeast:
                {
                    int count = GetInt(param, "Count");
                    RarityType rarity = EnumUtility<RarityType>.Get(GetString(param, "Rarity"));
                    return new CompCountAtLeastRequirement(new CompCountAtLeastParam(count, rarity));
                }
                case EventRequirementType.TowerCountAtLeast:
                {
                    int count = GetInt(param, "Count");
                    return new TowerCountAtLeastRequirement(new TowerCountAtLeastParam(count));
                }
                case EventRequirementType.HasRelic:
                {
                    int relicId = GetInt(param, "RelicId", "Id");
                    return new HasRelicRequirement(new HasRelicParam(relicId));
                }
                default:
                    Log.Warning("Unsupported EventRequirementType '{0}'.", rawType);
                    return null;
            }
        }

        private static int GetInt(JObject param, params string[] keys)
        {
            if (param == null)
            {
                return 0;
            }

            foreach (string key in keys)
            {
                if (param.TryGetValue(key, out JToken token) && token.Type != JTokenType.Null)
                {
                    return token.Value<int>();
                }
            }

            return 0;
        }

        private static string GetString(JObject param, string key)
        {
            if (param == null || !param.TryGetValue(key, out JToken token) || token.Type == JTokenType.Null)
            {
                return string.Empty;
            }

            return token.Value<string>();
        }
    }
}