90 lines
2.1 KiB
C#
90 lines
2.1 KiB
C#
//
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// Reference.cs
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//
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// Author:
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// fjy <jiyuan.feng@live.com>
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//
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// Copyright (c) 2020 fjy
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System.Collections.Generic;
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using UnityEngine;
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namespace libx
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{
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public class Reference
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{
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private List<Object> _requires;
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public bool IsUnused ()
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{
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if (_requires != null)
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{
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for (var i = 0; i < _requires.Count; i++)
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{
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var item = _requires[i];
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if (item != null)
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continue;
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Release();
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_requires.RemoveAt(i);
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i--;
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}
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if (_requires.Count == 0)
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_requires = null;
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}
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return refCount <= 0;
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}
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public int refCount;
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public virtual void Retain ()
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{
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refCount++;
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}
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public virtual void Release ()
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{
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refCount--;
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}
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private bool checkRequires
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{
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get { return _requires != null; }
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}
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public void Require(Object obj)
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{
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if (_requires == null)
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_requires = new List<Object>();
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_requires.Add(obj);
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Retain();
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}
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public void Dequire(Object obj)
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{
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if (_requires == null)
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return;
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if (_requires.Remove(obj))
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Release();
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}
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}
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}
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