namespace MySql.Data.Common
{
    using System;
    using System.Collections.Generic;
    using System.Reflection;

    internal class Cache<KeyType, ValueType>
    {
        private int _capacity;
        private Dictionary<KeyType, ValueType> _contents;
        private Queue<KeyType> _keyQ;

        public Cache(int initialCapacity, int capacity)
        {
            this._capacity = capacity;
            this._contents = new Dictionary<KeyType, ValueType>(initialCapacity);
            if (capacity > 0)
            {
                this._keyQ = new Queue<KeyType>(initialCapacity);
            }
        }

        public void Add(KeyType key, ValueType value)
        {
            this.InternalAdd(key, value);
        }

        private void InternalAdd(KeyType key, ValueType value)
        {
            if (!this._contents.ContainsKey(key) && (this._capacity > 0))
            {
                this._keyQ.Enqueue(key);
                if (this._keyQ.Count > this._capacity)
                {
                    this._contents.Remove(this._keyQ.Dequeue());
                }
            }
            this._contents[key] = value;
        }

        public ValueType this[KeyType key]
        {
            get
            {
                ValueType local;
                if (this._contents.TryGetValue(key, out local))
                {
                    return local;
                }
                return default(ValueType);
            }
            set
            {
                this.InternalAdd(key, value);
            }
        }
    }
}