TileLookup.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
 
public class TileLookup<T> where T : SourceData.BaseRow
{
    private const int DefaultRange = 1024;
 
    private readonly Dictionary<int, T> _map;
 
    private T[] _builtin = Array.Empty<T>();
 
    private T _fallback;
 
    private HashSet<int> _missing;
 
    public T this[int id]
    {
        get
        {
            T[] builtin = _builtin;
            if ((uint)id < (uint)builtin.Length)
            {
                T val = builtin[id];
                if (val != null)
                {
                    return val;
                }
            }
            return Resolve(id);
        }
    }
 
    public TileLookup(Dictionary<int, T> rowsById)
    {
        _map = rowsById;
    }
 
    public void Build()
    {
        _missing = null;
        _fallback = _map.TryGetValue(0);
        int maxId = -1;
        foreach (int item in _map.Keys.Where((int id) => id > maxId && id < 1024))
        {
            maxId = item;
        }
        _builtin = ((maxId < 0) ? Array.Empty<T>() : new T[maxId + 1]);
        foreach (KeyValuePair<int, T> item2 in _map.Where((KeyValuePair<int, T> kv) => kv.Key <= maxId))
        {
            _builtin[item2.Key] = item2.Value;
        }
    }
 
    private T Resolve(int id)
    {
        if (_map.TryGetValue(id, out var value))
        {
            return value;
        }
        if (_missing == null)
        {
            _missing = new HashSet<int>();
        }
        if (_missing.Add(id))
        {
            Debug.LogWarning($"#source missing tile row: {typeof(T).DeclaringType?.Name}#{id}");
        }
        return _fallback ?? _map.TryGetValue(0);
    }
}