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/*
* SPDX-FileCopyrightText: 2021-2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.logic.term.cardinalityinterval;
import org.jetbrains.annotations.Nullable;
import tools.refinery.logic.term.uppercardinality.UpperCardinalities;
import tools.refinery.logic.term.uppercardinality.UpperCardinality;
// Singleton implementation, because there is only a single empty interval.
@SuppressWarnings("squid:S6548")
public final class EmptyCardinalityInterval implements CardinalityInterval {
static final EmptyCardinalityInterval INSTANCE = new EmptyCardinalityInterval();
private EmptyCardinalityInterval() {
// Singleton constructor.
}
@Override
@Nullable
public Integer getConcrete() {
return null;
}
@Override
@Nullable
public Integer getArbitrary() {
return null;
}
@Override
public boolean isRefinementOf(CardinalityInterval other) {
return true;
}
@Override
public int lowerBound() {
return 1;
}
@Override
public UpperCardinality upperBound() {
return UpperCardinalities.ZERO;
}
@Override
public CardinalityInterval min(CardinalityInterval other) {
return this;
}
@Override
public CardinalityInterval max(CardinalityInterval other) {
return this;
}
@Override
public CardinalityInterval add(CardinalityInterval other) {
return this;
}
@Override
public CardinalityInterval take(int count) {
return this;
}
@Override
public CardinalityInterval multiply(CardinalityInterval other) {
return this;
}
@Override
public CardinalityInterval meet(CardinalityInterval other) {
return this;
}
@Override
public CardinalityInterval join(CardinalityInterval other) {
return other;
}
@Override
public String toString() {
return "error";
}
}
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