Helfer ForeignAggregate

Jan Burse, erstellt 09. Nov 2019
package jekpro.frequent.advanced;
import jekpro.model.molec.Display;
import jekpro.model.pretty.Foyer;
import jekpro.reference.structure.EngineLexical;
import jekpro.tools.call.CallOut;
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.regex.IgnoreCase;
/**
* <p>Provides built-in predicates for the module aggregate.</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 ForeignAggregate {
/**
* <p>Check if the variant comparator is eager.</p>
*
* @param el The variant comparator.
* @return True if the variant comparator is eager, otherwise false.
*/
public static boolean sysVariantEager(EngineLexical el) {
return ((el.getFlags() & EngineLexical.MASK_FLAG_EAGR) != 0);
}
/**
* <p>Check if the variant comparator is natural.</p>
*
* @param el The variant comparator.
* @return True if the variant comparator is natural, otherwise false.
*/
public static boolean sysVariantNatural(EngineLexical el) {
return (el.getComparator() == IgnoreCase.DEFAULT_TERTIARY);
}
/**
* <p>Check if the variant comparator is reverse.</p>
*
* @param el The variant comparator.
* @return True if the variant comparator is reverse, otherwise false.
*/
public static boolean sysVariantReverse(EngineLexical el) {
return ((el.getFlags() & EngineLexical.MASK_FLAG_RVRS) != 0);
}
/**
* <p>Enumerate the revolve.</p>
*
* @param co The call out.
* @param map The map.
* @param el The variant comparator.
* @return The pair.
*/
public static Object sysRevolvePair(CallOut co, AbstractMap map,
EngineLexical el) {
MapEntry at;
if (co.getFirst()) {
if ((el.getFlags() & EngineLexical.MASK_FLAG_RVRS) != 0) {
at = map.getLastEntry();
} else {
at = map.getFirstEntry();
}
if (at == null)
return null;
} else {
at = (MapEntry) co.getData();
}
MapEntry next;
if ((el.getFlags() & EngineLexical.MASK_FLAG_RVRS) != 0) {
next = map.predecessor(at);
} else {
next = map.successor(at);
}
co.setRetry(next != null);
co.setData(next);
Object val = new SkelCompound(new SkelAtom(Foyer.OP_SUB), at.key, at);
Display ref = AbstractSkel.createMarker(val);
return AbstractTerm.createMolec(val, ref);
}
}

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