Helfer UndoSerno

Jan Burse, erstellt 23. Mär 2019
package jekpro.model.molec;
import jekpro.model.inter.Engine;
/**
* <p>The class provides a serial number undo.</p>
* <p/>
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
* <p/>
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
* <p/>
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
* <p/>
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
* <p/>
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
public final class UndoSerno extends AbstractUndo {
private final BindUniv skel;
/**
* <p>Create a serno binder.</p>
*
* @param d The bind count.
*/
private UndoSerno(BindUniv d) {
skel = d;
}
/**
* <p>Reset the serno.</p>
*
* @param en The engine.
*/
public void unbind(Engine en) {
/* reset serno */
BindUniv bc = skel;
int k = bc.serno;
if (k == -1)
throw new IllegalStateException("value missing");
bc.serno = -1;
en.serno = k;
removeBind(en);
}
/**
* <p>Set a new serno.</p>
*
* @param d The display.
* @param en The engine.
* @return The new serno.
*/
public static int bindSerno(BindUniv d, Engine en) {
/* set serno */
if (d.serno != -1)
throw new IllegalStateException("cant override");
int k = en.serno;
d.serno = k;
en.serno = k + 1;
UndoSerno bs = new UndoSerno(d);
bs.addBind(en);
return k;
}
}

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