53 lines
1.3 KiB
C#
53 lines
1.3 KiB
C#
using System.Collections.Generic;
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namespace Cryville.Common {
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/// <summary>
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/// A manager that assigns each given identifiers a unique integer ID.
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/// </summary>
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public class IdentifierManager {
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/// <summary>
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/// A shared instance of the <see cref="IdentifierManager" /> class.
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/// </summary>
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public static IdentifierManager SharedInstance = new IdentifierManager();
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readonly Dictionary<object, int> _idents = new Dictionary<object, int>();
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readonly List<object> _ids = new List<object>();
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readonly object _syncRoot = new object();
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/// <summary>
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/// Creates an instance of the <see cref="IdentifierManager" /> class.
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/// </summary>
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public IdentifierManager() {
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Request(this);
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}
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/// <summary>
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/// Requests an integer ID for an identifier.
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/// </summary>
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/// <param name="ident">The identifier.</param>
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/// <returns>The integer ID.</returns>
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public int Request(object ident) {
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lock (_syncRoot) {
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int id;
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if (!_idents.TryGetValue(ident, out id)) {
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_idents.Add(ident, id = _idents.Count);
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_ids.Add(ident);
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}
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return id;
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}
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}
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/// <summary>
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/// Retrieves the identifier assigned with an integer ID.
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/// </summary>
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/// <param name="id">The integer ID.</param>
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/// <returns>The identifier.</returns>
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public object Retrieve(int id) {
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lock (_syncRoot) {
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return _ids[id];
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}
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}
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}
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}
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