100 lines
2.6 KiB
C#
100 lines
2.6 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2019 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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namespace OpenRA
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{
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/// <summary>
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/// A minimal read only dictionary interface for .NET 4
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/// </summary>
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/// <remarks>
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/// .NET 4.5 has an implementation built-in, this code is not meant to
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/// duplicate it but provide a compatible interface that can be replaced
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/// when we switch to .NET 4.5 or higher.
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/// </remarks>
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public interface IReadOnlyDictionary<TKey, TValue> : IEnumerable<KeyValuePair<TKey, TValue>>
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{
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int Count { get; }
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TValue this[TKey key] { get; }
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ICollection<TKey> Keys { get; }
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ICollection<TValue> Values { get; }
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bool ContainsKey(TKey key);
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bool TryGetValue(TKey key, out TValue value);
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}
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public static class ReadOnlyDictionary
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{
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public static IReadOnlyDictionary<TKey, TValue> AsReadOnly<TKey, TValue>(this IDictionary<TKey, TValue> dict)
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{
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return dict as IReadOnlyDictionary<TKey, TValue> ?? new ReadOnlyDictionary<TKey, TValue>(dict);
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}
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}
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/// <summary>
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/// A minimal read only dictionary for .NET 4 implemented as a wrapper
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/// around an IDictionary.
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/// </summary>
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public class ReadOnlyDictionary<TKey, TValue> : IReadOnlyDictionary<TKey, TValue>
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{
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private readonly IDictionary<TKey, TValue> dict;
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public ReadOnlyDictionary()
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: this(new Dictionary<TKey, TValue>())
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{
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}
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public ReadOnlyDictionary(IDictionary<TKey, TValue> dict)
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{
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if (dict == null)
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throw new ArgumentNullException("dict");
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this.dict = dict;
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}
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#region IReadOnlyDictionary implementation
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public bool ContainsKey(TKey key)
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{
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return dict.ContainsKey(key);
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}
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public bool TryGetValue(TKey key, out TValue value)
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{
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return dict.TryGetValue(key, out value);
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}
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public int Count { get { return dict.Count; } }
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public TValue this[TKey key] { get { return dict[key]; } }
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public ICollection<TKey> Keys { get { return dict.Keys; } }
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public ICollection<TValue> Values { get { return dict.Values; } }
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#endregion
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#region IEnumerable implementation
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public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
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{
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return dict.GetEnumerator();
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}
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#endregion
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#region IEnumerable implementation
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System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
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{
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return dict.GetEnumerator();
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}
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#endregion
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}
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}
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