using System;
using System.Collections;

namespace System.Text.RegularExpressions
{
	// Token: 0x020002BF RID: 703
	internal class FactoryCache
	{
		// Token: 0x0600199E RID: 6558 RVA: 0x0005B1C0 File Offset: 0x000593C0
		public FactoryCache(int capacity)
		{
			this.capacity = capacity;
			this.factories = new Hashtable(capacity);
			this.mru_list = new MRUList();
		}

		// Token: 0x0600199F RID: 6559 RVA: 0x0005B1F4 File Offset: 0x000593F4
		public void Add(string pattern, RegexOptions options, IMachineFactory factory)
		{
			lock (this)
			{
				FactoryCache.Key key = new FactoryCache.Key(pattern, options);
				this.Cleanup();
				this.factories[key] = factory;
				this.mru_list.Use(key);
			}
		}

		// Token: 0x060019A0 RID: 6560 RVA: 0x0005B258 File Offset: 0x00059458
		private void Cleanup()
		{
			while (this.factories.Count >= this.capacity && this.capacity > 0)
			{
				object obj = this.mru_list.Evict();
				if (obj != null)
				{
					this.factories.Remove((FactoryCache.Key)obj);
				}
			}
		}

		// Token: 0x060019A1 RID: 6561 RVA: 0x0005B2B0 File Offset: 0x000594B0
		public IMachineFactory Lookup(string pattern, RegexOptions options)
		{
			lock (this)
			{
				FactoryCache.Key key = new FactoryCache.Key(pattern, options);
				if (this.factories.Contains(key))
				{
					this.mru_list.Use(key);
					return (IMachineFactory)this.factories[key];
				}
			}
			return null;
		}

		// Token: 0x17000800 RID: 2048
		// (get) Token: 0x060019A2 RID: 6562 RVA: 0x0005B32C File Offset: 0x0005952C
		// (set) Token: 0x060019A3 RID: 6563 RVA: 0x0005B334 File Offset: 0x00059534
		public int Capacity
		{
			get
			{
				return this.capacity;
			}
			set
			{
				lock (this)
				{
					this.capacity = value;
					this.Cleanup();
				}
			}
		}

		// Token: 0x040014D4 RID: 5332
		private int capacity;

		// Token: 0x040014D5 RID: 5333
		private Hashtable factories;

		// Token: 0x040014D6 RID: 5334
		private MRUList mru_list;

		// Token: 0x020002C0 RID: 704
		private class Key
		{
			// Token: 0x060019A4 RID: 6564 RVA: 0x0005B380 File Offset: 0x00059580
			public Key(string pattern, RegexOptions options)
			{
				this.pattern = pattern;
				this.options = options;
			}

			// Token: 0x060019A5 RID: 6565 RVA: 0x0005B398 File Offset: 0x00059598
			public override int GetHashCode()
			{
				return this.pattern.GetHashCode() ^ (int)this.options;
			}

			// Token: 0x060019A6 RID: 6566 RVA: 0x0005B3AC File Offset: 0x000595AC
			public override bool Equals(object o)
			{
				if (o == null || !(o is FactoryCache.Key))
				{
					return false;
				}
				FactoryCache.Key key = (FactoryCache.Key)o;
				return this.options == key.options && this.pattern.Equals(key.pattern);
			}

			// Token: 0x060019A7 RID: 6567 RVA: 0x0005B3F8 File Offset: 0x000595F8
			public override string ToString()
			{
				return string.Concat(new object[] { "('", this.pattern, "', [", this.options, "])" });
			}

			// Token: 0x040014D7 RID: 5335
			public string pattern;

			// Token: 0x040014D8 RID: 5336
			public RegexOptions options;
		}
	}
}