ET9_WebGL_Dev/CSharp/Platform/Common/Base/MultiMap.cs

using System.Collections.Generic;

namespace Common.Base
{
    public class MultiMap<T, K>
    {
        private readonly SortedDictionary<T, List<K>> dictionary =
                new SortedDictionary<T, List<K>>();

        public SortedDictionary<T, List<K>>.KeyCollection Keys
        {
            get
            {
                return this.dictionary.Keys;
            }
        }

        public void Add(T t, K k)
        {
            List<K> list;
            this.dictionary.TryGetValue(t, out list);
            if (list == null)
            {
                list = new List<K>();
            }
            list.Add(k);
            this.dictionary[t] = list;
        }

        public bool Remove(T t, K k)
        {
            List<K> list;
            this.dictionary.TryGetValue(t, out list);
            if (list == null)
            {
                return false;
            }
            if (!list.Remove(k))
            {
                return false;
            }
            if (list.Count == 0)
            {
                this.dictionary.Remove(t);
            }
            return true;
        }

        public bool Remove(T t)
        {
            return this.dictionary.Remove(t);
        }

        /// <summary>
        /// 不返回内部的list,copy一份出来
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public K[] GetByKey(T t)
        {
            List<K> list;
            this.dictionary.TryGetValue(t, out list);
            if (list == null)
            {
                return new K[0];
            }
            var newList = new List<K>();
            foreach (K k in list)
            {
                newList.Add(k);
            }
            return newList.ToArray();
        }

        /// <summary>
        /// 返回内部的list
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public List<K> this[T t]
        {
            get
            {
                List<K> list;
                this.dictionary.TryGetValue(t, out list);
                return list;
            }
        }

        public K GetOne(T t)
        {
            List<K> list;
            this.dictionary.TryGetValue(t, out list);
            if ((list != null) && (list.Count > 0))
            {
                return list[0];
            }
            return default(K);
        }

        public bool Contains(T t, K k)
        {
            List<K> list;
            this.dictionary.TryGetValue(t, out list);
            if (list == null)
            {
                return false;
            }
            return list.Contains(k);
        }
    }
}