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/>
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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;
* <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);
return val;