114 lines
3.2 KiB
C#
114 lines
3.2 KiB
C#
/**
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* Copyright(c) Live2D Inc. All rights reserved.
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*
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* Use of this source code is governed by the Live2D Open Software license
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* that can be found at https://www.live2d.com/eula/live2d-open-software-license-agreement_en.html.
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*/
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using UnityEngine;
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namespace Live2D.Cubism.Framework
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{
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/// <summary>
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/// Extensions for <see cref="Object"/>s.
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/// </summary>
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internal static class ObjectExtensionMethods
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{
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/// <summary>
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/// Extracts an interface from an <see cref="Object"/>.
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/// </summary>
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/// <typeparam name="T">Interface type to extract.</typeparam>
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/// <param name="self"><see langword="this"/>.</param>
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/// <returns>Valid reference on success; <see langword="null"/> otherwise.</returns>
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public static T GetInterface<T>(this Object self) where T : class
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{
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var result = self as T;
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if (result != null)
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{
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return result;
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}
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// Deal with GameObjects.
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var gameObject = self as GameObject;
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if (gameObject != null)
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{
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result = gameObject.GetComponent<T>();
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}
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// Warn on error.
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if (self != null && result == null)
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{
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Debug.LogWarning(self + " doesn't expose requested interface of type \"" + typeof(T) + "\".");
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}
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return result;
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}
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/// <summary>
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/// Nulls reference in case an <see cref="Object"/> doesn't expose an interface requested.
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/// </summary>
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/// <typeparam name="T">Type of interface to check for.</typeparam>
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/// <param name="self"><see langword="this"/>.</param>
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/// <returns><paramref name="self"/> if object exposes interface; <see langword="null"/> otherwise.</returns>
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public static Object ToNullUnlessImplementsInterface<T>(this Object self) where T : class
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{
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var exposesInterface = self.ImplementsInterface<T>();
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// Warn on error.
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if (self != null && !exposesInterface)
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{
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Debug.LogWarning(self + " doesn't expose requested interface of type \"" + typeof(T) + "\".");
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}
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return (exposesInterface)
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? self
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: null;
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}
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/// <summary>
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/// Checks whether a <see cref="Object"/> implements an interface.
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/// </summary>
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/// <typeparam name="T">Interface type to check against.</typeparam>
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/// <param name="self"><see langword="this"/>.</param>
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/// <returns><see langword="true"/> if interface is exposed; <see langword="false"/> otherwise.</returns>
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public static bool ImplementsInterface<T>(this Object self)
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{
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// Return early in case argument matches type.
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if (self is T)
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{
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return true;
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}
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// Search in components in case object is a GameObject.
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var gameObject = self as GameObject;
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if (gameObject != null)
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{
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var components = gameObject.GetComponents<T>();
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return components.Length > 0;
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}
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// Return on fail.
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return false;
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}
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}
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}
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