hondacrx
102 lines
3.4 KiB
C#
102 lines
3.4 KiB
C#
/*
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* Copyright (C) 2012-2020 CypherCore <http://github.com/CypherCore>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using Framework.Collections;
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namespace Framework.Dynamic
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{
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public class Reference<TO, FROM> : LinkedListElement where TO : class where FROM : class
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{
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TO _RefTo;
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FROM _RefFrom;
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// Tell our refTo (target) object that we have a link
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public virtual void TargetObjectBuildLink() { }
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// Tell our refTo (taget) object, that the link is cut
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public virtual void TargetObjectDestroyLink() { }
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// Tell our refFrom (source) object, that the link is cut (Target destroyed)
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public virtual void SourceObjectDestroyLink() { }
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public Reference()
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{
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_RefTo = null; _RefFrom = null;
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}
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// Create new link
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public void Link(TO toObj, FROM fromObj)
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{
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Cypher.Assert(fromObj != null); // fromObj MUST not be NULL
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if (IsValid())
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Unlink();
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if (toObj != null)
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{
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_RefTo = toObj;
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_RefFrom = fromObj;
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TargetObjectBuildLink();
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}
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}
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// We don't need the reference anymore. Call comes from the refFrom object
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// Tell our refTo object, that the link is cut
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public void Unlink()
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{
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TargetObjectDestroyLink();
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Delink();
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_RefTo = null;
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_RefFrom = null;
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}
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// Link is invalid due to destruction of referenced target object. Call comes from the refTo object
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// Tell our refFrom object, that the link is cut
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public void Invalidate() // the iRefFrom MUST remain!!
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{
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SourceObjectDestroyLink();
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Delink();
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_RefTo = null;
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}
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public bool IsValid() // Only check the iRefTo
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{
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return _RefTo != null;
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}
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public Reference<TO, FROM> Next() { return ((Reference<TO, FROM>)GetNextElement()); }
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public Reference<TO, FROM> Prev() { return ((Reference<TO, FROM>)GetPrevElement()); }
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public TO GetTarget() { return _RefTo; }
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public FROM GetSource() { return _RefFrom; }
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}
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public class RefManager<TO, FROM> : LinkedListHead where TO : class where FROM : class
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{
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~RefManager() { ClearReferences(); }
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public Reference<TO, FROM> GetFirst() { return (Reference<TO, FROM>)base.GetFirstElement(); }
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public Reference<TO, FROM> GetLast() { return (Reference<TO, FROM>)base.GetLastElement(); }
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public void ClearReferences()
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{
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Reference<TO, FROM> refe;
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while ((refe = GetFirst()) != null)
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refe.Invalidate();
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}
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}
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}
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