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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.query.rewriter;
import tools.refinery.store.query.dnf.Dnf;
import tools.refinery.store.query.dnf.DnfClause;
import tools.refinery.store.query.dnf.Query;
import tools.refinery.store.query.equality.DnfEqualityChecker;
import tools.refinery.store.query.literal.AbstractCallLiteral;
import tools.refinery.store.query.literal.Literal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class DuplicateDnfRemover extends AbstractRecursiveRewriter {
private final Map<CanonicalDnf, Dnf> dnfCache = new HashMap<>();
private final Map<Dnf, Query<?>> queryCache = new HashMap<>();
@Override
protected Dnf map(Dnf dnf) {
var result = super.map(dnf);
return dnfCache.computeIfAbsent(new CanonicalDnf(result), CanonicalDnf::getDnf);
}
@Override
protected Dnf doRewrite(Dnf dnf) {
var builder = Dnf.builderFrom(dnf);
for (var clause : dnf.getClauses()) {
builder.clause(rewriteClause(clause));
}
return builder.build();
}
private List<Literal> rewriteClause(DnfClause clause) {
var originalLiterals = clause.literals();
var literals = new ArrayList<Literal>(originalLiterals.size());
for (var literal : originalLiterals) {
var rewrittenLiteral = literal;
if (literal instanceof AbstractCallLiteral abstractCallLiteral &&
abstractCallLiteral.getTarget() instanceof Dnf targetDnf) {
var rewrittenTarget = rewrite(targetDnf);
rewrittenLiteral = abstractCallLiteral.withTarget(rewrittenTarget);
}
literals.add(rewrittenLiteral);
}
return literals;
}
@Override
public <T> Query<T> rewrite(Query<T> query) {
var rewrittenDnf = rewrite(query.getDnf());
// {@code withDnf} will always return the appropriate type.
@SuppressWarnings("unchecked")
var rewrittenQuery = (Query<T>) queryCache.computeIfAbsent(rewrittenDnf, query::withDnf);
return rewrittenQuery;
}
private static class CanonicalDnf {
private final Dnf dnf;
private final int hash;
public CanonicalDnf(Dnf dnf) {
this.dnf = dnf;
hash = dnf.hashCodeWithSubstitution();
}
public Dnf getDnf() {
return dnf;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
var otherCanonicalDnf = (CanonicalDnf) obj;
return dnf.equalsWithSubstitution(DnfEqualityChecker.DEFAULT, otherCanonicalDnf.dnf);
}
@Override
public int hashCode() {
return hash;
}
@Override
public String toString() {
return dnf.name();
}
}
}
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