41 lines
1.7 KiB
C#
41 lines
1.7 KiB
C#
using System;
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using System.Collections.Generic;
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namespace Jovian.EncounterSystem {
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/// <summary>Dispatches <see cref="IEncounterEvent"/> instances to per-type handlers. Unknown types are skipped.</summary>
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public class EncounterResolver {
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private readonly Dictionary<Type, Action<IEncounterEvent, EncounterContext>> handlers = new();
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public void Register<T>(Action<T, EncounterContext> handler) where T : IEncounterEvent {
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// Wrap the typed delegate so the dictionary can hold handlers for any event type uniformly.
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// Cast is safe because the wrapper is only invoked via lookup under typeof(T).
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handlers[typeof(T)] = (evt, ctx) => handler((T)evt, ctx);
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}
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public void Unregister<T>() where T : IEncounterEvent {
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handlers.Remove(typeof(T));
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}
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/// <summary>Indexed iteration over <paramref name="events"/> — avoids the boxed enumerator
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/// that an <c>IEnumerable<T></c> parameter would force. <see cref="EncounterDialogOption.events"/>
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/// is a <c>List</c>, which implements <c>IReadOnlyList</c>, so call sites just pass it directly.</summary>
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public void Resolve(IReadOnlyList<IEncounterEvent> events, EncounterContext context) {
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if(events == null) {
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return;
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}
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var count = events.Count;
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for(int i = 0; i < count; i++) {
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var evt = events[i];
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if(evt == null) {
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continue;
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}
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if(handlers.TryGetValue(evt.GetType(), out var handler)) {
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handler(evt, context);
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}
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}
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}
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}
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}
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