hondacrx
106 lines
3.7 KiB
C#
106 lines
3.7 KiB
C#
/*
|
|
* Copyright (C) 2012-2017 CypherCore <http://github.com/CypherCore>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
using Framework.Collections;
|
|
using System.Diagnostics.Contracts;
|
|
|
|
namespace Framework.Dynamic
|
|
{
|
|
public class Reference<TO, FROM> : LinkedListElement where TO : class where FROM : class
|
|
{
|
|
TO _RefTo;
|
|
FROM _RefFrom;
|
|
|
|
// Tell our refTo (target) object that we have a link
|
|
public virtual void targetObjectBuildLink() { }
|
|
|
|
// Tell our refTo (taget) object, that the link is cut
|
|
public virtual void targetObjectDestroyLink() { }
|
|
|
|
// Tell our refFrom (source) object, that the link is cut (Target destroyed)
|
|
public virtual void sourceObjectDestroyLink() { }
|
|
|
|
public Reference()
|
|
{
|
|
_RefTo = null; _RefFrom = null;
|
|
}
|
|
|
|
// Create new link
|
|
public void link(TO toObj, FROM fromObj)
|
|
{
|
|
Contract.Assert(fromObj != null); // fromObj MUST not be NULL
|
|
if (isValid())
|
|
unlink();
|
|
if (toObj != null)
|
|
{
|
|
_RefTo = toObj;
|
|
_RefFrom = fromObj;
|
|
targetObjectBuildLink();
|
|
}
|
|
}
|
|
|
|
// We don't need the reference anymore. Call comes from the refFrom object
|
|
// Tell our refTo object, that the link is cut
|
|
public void unlink()
|
|
{
|
|
targetObjectDestroyLink();
|
|
delink();
|
|
_RefTo = null;
|
|
_RefFrom = null;
|
|
}
|
|
|
|
// Link is invalid due to destruction of referenced target object. Call comes from the refTo object
|
|
// Tell our refFrom object, that the link is cut
|
|
public void invalidate() // the iRefFrom MUST remain!!
|
|
{
|
|
sourceObjectDestroyLink();
|
|
delink();
|
|
_RefTo = null;
|
|
}
|
|
|
|
public bool isValid() // Only check the iRefTo
|
|
{
|
|
return _RefTo != null;
|
|
}
|
|
|
|
public Reference<TO, FROM> next() { return ((Reference<TO, FROM>)GetNextElement()); }
|
|
public Reference<TO, FROM> prev() { return ((Reference<TO, FROM>)GetPrevElement()); }
|
|
|
|
public TO getTarget() { return _RefTo; }
|
|
|
|
public FROM GetSource() { return _RefFrom; }
|
|
}
|
|
|
|
public class RefManager<TO, FROM> : LinkedListHead where TO : class where FROM : class
|
|
{
|
|
~RefManager() { clearReferences(); }
|
|
|
|
public Reference<TO, FROM> getFirst() { return (Reference<TO, FROM>)base.GetFirstElement(); }
|
|
public Reference<TO, FROM> getLast() { return (Reference<TO, FROM>)base.GetLastElement(); }
|
|
|
|
public void clearReferences()
|
|
{
|
|
LinkedListElement curr;
|
|
while ((curr = base.GetFirstElement()) != null)
|
|
{
|
|
((Reference<TO, FROM>)curr).invalidate();
|
|
curr.delink(); // the delink might be already done by invalidate(), but doing it here again does not hurt and insures an empty list
|
|
}
|
|
}
|
|
}
|
|
}
|