package aima.core.logic.fol.inference.otter.defaultimpl;
import java.util.ArrayList;
import java.util.List;
import aima.core.logic.fol.inference.Demodulation;
import aima.core.logic.fol.inference.otter.ClauseSimplifier;
import aima.core.logic.fol.kb.data.Clause;
import aima.core.logic.fol.parsing.ast.TermEquality;
/**
* @author Ciaran O'Reilly
*
*/
public class DefaultClauseSimplifier implements ClauseSimplifier {
private Demodulation demodulation = new Demodulation();
private List<TermEquality> rewrites = new ArrayList<TermEquality>();
public DefaultClauseSimplifier() {
}
public DefaultClauseSimplifier(List<TermEquality> rewrites) {
this.rewrites.addAll(rewrites);
}
//
// START-ClauseSimplifier
public Clause simplify(Clause c) {
Clause simplified = c;
// Apply each of the rewrite rules to
// the clause
for (TermEquality te : rewrites) {
Clause dc = simplified;
// Keep applying the rewrite as many times as it
// can be applied before moving on to the next one.
while (null != (dc = demodulation.apply(te, dc))) {
simplified = dc;
}
}
return simplified;
}
// END-ClauseSimplifier
//
}