Helper ForeignSequence

Jan Burse, created Jul 26. 2019
package jekpro.frequent.advanced;
import jekpro.model.inter.Engine;
import jekpro.model.molec.Display;
import jekpro.tools.call.Interpreter;
import jekpro.tools.term.AbstractSkel;
import jekpro.tools.term.AbstractTerm;
import matula.util.data.SetEntry;
/**
* <p>Provides built-in predicates for the module sequence.</p>
* <p/>
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* provided by XLOG Technologies GmbH.
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*/
public final class ForeignSequence {
/**
* <p>Set a pivot value.</p>
*
* @param inter The interpreter.
* @param pivot The pivot.
* @param val The value.
*/
public static void sysPivotSet(Interpreter inter, SetEntry pivot, Object val) {
Engine en = (Engine) inter.getEngine();
Display ref = AbstractTerm.getDisplay(val);
val = AbstractTerm.getSkel(val);
pivot.value = AbstractSkel.copySkel(val, ref, en);
}
/**
* <p>Retreve a pivot value.</p>
*
* @param pivot The pivot.
* @return The value.
*/
public static Object sysPivotGet(SetEntry pivot) {
Object val = pivot.value;
if (val == null)
return null;
Display ref = AbstractSkel.createMarker(val);
return AbstractTerm.createMolec(val, ref);
}
}

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