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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.query.substitution;
import tools.refinery.store.query.term.DataVariable;
import tools.refinery.store.query.term.NodeVariable;
import tools.refinery.store.query.term.Variable;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@SuppressWarnings("UnusedReturnValue")
public class SubstitutionBuilder {
private final Map<Variable, Variable> map = new HashMap<>();
private Substitution fallback;
SubstitutionBuilder() {
total();
}
public SubstitutionBuilder put(NodeVariable original, NodeVariable substitute) {
return putChecked(original, substitute);
}
public <T> SubstitutionBuilder put(DataVariable<T> original, DataVariable<T> substitute) {
return putChecked(original, substitute);
}
public SubstitutionBuilder putChecked(Variable original, Variable substitute) {
if (!original.getSort().equals(substitute.getSort())) {
throw new IllegalArgumentException("Cannot substitute variable %s of sort %s with variable %s of sort %s"
.formatted(original, original.getSort(), substitute, substitute.getSort()));
}
if (map.containsKey(original)) {
throw new IllegalArgumentException("Already has substitution for variable %s".formatted(original));
}
map.put(original, substitute);
return this;
}
public SubstitutionBuilder putManyChecked(List<Variable> originals, List<Variable> substitutes) {
int size = originals.size();
if (size != substitutes.size()) {
throw new IllegalArgumentException("Cannot substitute %d variables %s with %d variables %s"
.formatted(size, originals, substitutes.size(), substitutes));
}
for (int i = 0; i < size; i++) {
putChecked(originals.get(i), substitutes.get(i));
}
return this;
}
public SubstitutionBuilder fallback(Substitution newFallback) {
fallback = newFallback;
return this;
}
public SubstitutionBuilder total() {
return fallback(StatelessSubstitution.FAILING);
}
public SubstitutionBuilder partial() {
return fallback(StatelessSubstitution.IDENTITY);
}
public SubstitutionBuilder renewing() {
return fallback(new RenewingSubstitution());
}
public Substitution build() {
return map.isEmpty() ? fallback : new MapBasedSubstitution(Collections.unmodifiableMap(map), fallback);
}
}
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