Helfer ForeignAggregate

Jan Burse, erstellt 26. Jul 2019
package jekpro.frequent.advanced;
import jekpro.model.inter.Engine;
import jekpro.model.molec.Display;
import jekpro.model.pretty.Foyer;
import jekpro.tools.call.CallOut;
import jekpro.tools.call.Interpreter;
import jekpro.tools.term.AbstractSkel;
import jekpro.tools.term.AbstractTerm;
import jekpro.tools.term.SkelAtom;
import jekpro.tools.term.SkelCompound;
import matula.util.data.AbstractMap;
import matula.util.data.MapEntry;
import matula.util.data.SetEntry;
import java.util.Comparator;
* <p>Provides built-in predicates for the module aggregate.</p>
* <p/>
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* 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/>
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* and patent rights in particular - are the sole property of XLOG
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* 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.
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public final class ForeignAggregate {
* <p>Place a copy into the revolve.</p>
* @param inter The interpreter.
* @param map The map.
* @param val The key.
public static SetEntry sysRevolveLookup(Interpreter inter,
AbstractMap map, Object val) {
Engine en = (Engine) inter.getEngine();
Display d = AbstractTerm.getDisplay(val);
val = AbstractTerm.getSkel(val);
val = AbstractSkel.copySkel(val, d, en);
MapEntry h = map.getEntry(val);
if (h == null) {
h = map.newEntry(val, null);
return h;
* <p>Enumerate the revolve.</p>
* @param co The call out.
* @param map The map.
* @return The pair.
public static Object sysRevolvePair(CallOut co, AbstractMap map) {
MapEntry at;
if (co.getFirst()) {
at = map.getFirstEntry();
} else {
at = (MapEntry) co.getData();
if (at == null)
return null;
MapEntry next = map.successor(at);
co.setRetry(next != null);
Object val = new SkelCompound(new SkelAtom(Foyer.OP_SUB), at.key, at);
Display ref = AbstractSkel.createMarker(val);
return AbstractTerm.createMolec(val, ref);
* <p>Retrieve the variant comparator.</p>
* @return The variant comparator.
public static Comparator<Object> sysVariantComparator() {
return AbstractSkel.DEFAULT;