Helfer UndoCont

Jan Burse, erstellt 23. Mär 2019
package jekpro.model.molec;
import jekpro.model.inter.Engine;
import jekpro.model.inter.Supervisor;
import matula.util.data.ListArray;
/**
* <p>The class provides a continuation 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 UndoCont extends AbstractUndo {
private final ListArray<BindUniv> skel;
/**
* <p>Create a last binder.</p>
*
* @param v The value.
*/
private UndoCont(ListArray<BindUniv> v) {
skel = v;
}
/**
* <p>Set the continuation queue.</p>
*
* @param en The engine.
*/
public void unbind(Engine en) {
/* set back */
ListArray<BindUniv> val = skel;
Supervisor visor = en.visor;
if (visor.cont != null)
throw new IllegalStateException("cant override");
visor.cont = val;
removeBind(en);
}
/**
* <p>Retrieve and clear the continuation queue.</p>
*
* @param en The engine.
* @return The continuation queue.
*/
public static ListArray<BindUniv> bindCont(Engine en) {
/* retrieve and clear */
Supervisor visor = en.visor;
ListArray<BindUniv> val = visor.cont;
if (val == null)
throw new IllegalStateException("value missing");
visor.cont = null;
UndoCont bs = new UndoCont(val);
bs.addBind(en);
return val;
}
}

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