44 lines
1.6 KiB
C#
44 lines
1.6 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.
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/// Handlers return <c>true</c> to stop processing remaining events.</summary>
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public class EncounterResolver {
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private readonly Dictionary<Type, Func<IEncounterEvent, EncounterContext, bool>> handlers = new();
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public void Register<T>(Func<T, EncounterContext, bool> handler) where T : IEncounterEvent {
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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. Stops when a handler
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/// returns <c>true</c> or <see cref="EncounterContext.ShouldStopEvents"/> is set.</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(var i = 0; i < count; i++) {
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var evt = events[i];
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if(evt == null || context.ShouldStopEvents) {
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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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continue;
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}
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if(handler(evt, context)) {
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context.ShouldStopEvents = true;
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}
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}
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}
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}
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}
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