modernuo/Projects/Server/KeywordList.cs

using System;

namespace Server
{
    public class KeywordList
    {
        private static readonly int[] m_EmptyInts = Array.Empty<int>();
        private int[] m_Keywords;

        public KeywordList()
        {
            m_Keywords = new int[8];
            Count = 0;
        }

        public int Count { get; private set; }

        public bool Contains(int keyword)
        {
            var contains = false;

            for (var i = 0; !contains && i < Count; ++i)
            {
                contains = keyword == m_Keywords[i];
            }

            return contains;
        }

        public void Add(int keyword)
        {
            if (Count + 1 > m_Keywords.Length)
            {
                var old = m_Keywords;
                m_Keywords = new int[old.Length * 2];

                for (var i = 0; i < old.Length; ++i)
                {
                    m_Keywords[i] = old[i];
                }
            }

            m_Keywords[Count++] = keyword;
        }

        public int[] ToArray()
        {
            if (Count == 0)
            {
                return m_EmptyInts;
            }

            var keywords = new int[Count];

            for (var i = 0; i < Count; ++i)
            {
                keywords[i] = m_Keywords[i];
            }

            Count = 0;

            return keywords;
        }
    }
}