redglow
43 lines
1.2 KiB
C#
43 lines
1.2 KiB
C#
using System;
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namespace GodotHostTest.GodotDI;
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/// <summary>
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/// An object that allows communication through scopes, by providing a couple getter/setter that can be injected in
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/// different scopes.
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/// </summary>
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/// <typeparam name="T">The type that's been passed through scopes.</typeparam>
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/// <seealso cref="BuilderExtensions.AddValueProvider" />
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public class ValueProvider<T>
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{
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private bool _isSet;
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private T? _value;
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public ValueProvider()
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{
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Setter = new SetterImplementation(this);
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}
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public IValueSetter<T> Setter { get; }
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public IValueGetter<T> Getter => !_isSet
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? throw new InvalidOperationException($"Value of type {typeof(T)} has not been set yet.")
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: new GetterImplementation(_value!);
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private class SetterImplementation(ValueProvider<T> valueProvider) : IValueSetter<T>
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{
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public void Set(T value)
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{
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if (valueProvider._isSet)
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throw new InvalidOperationException($"A value (of type {typeof(T)}) cannot be set more than once.");
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valueProvider._value = value;
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valueProvider._isSet = true;
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}
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}
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private class GetterImplementation(T value) : IValueGetter<T>
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{
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public T Value => value;
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}
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} |