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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.logic.term.cardinalityinterval;
import tools.refinery.logic.term.uppercardinality.FiniteUpperCardinality;
import tools.refinery.logic.term.uppercardinality.UpperCardinality;
import java.util.Objects;
import java.util.function.BinaryOperator;
import java.util.function.IntBinaryOperator;
public record NonEmptyCardinalityInterval(int lowerBound, UpperCardinality upperBound) implements CardinalityInterval {
public NonEmptyCardinalityInterval {
if (lowerBound < 0) {
throw new IllegalArgumentException("lowerBound must not be negative");
}
if (upperBound.compareToInt(lowerBound) < 0) {
throw new IllegalArgumentException("lowerBound must not be larger than upperBound");
}
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public CardinalityInterval min(CardinalityInterval other) {
return lift(other, Math::min, UpperCardinality::min);
}
@Override
public CardinalityInterval max(CardinalityInterval other) {
return lift(other, Math::max, UpperCardinality::max);
}
@Override
public CardinalityInterval add(CardinalityInterval other) {
return lift(other, Integer::sum, UpperCardinality::add);
}
@Override
public CardinalityInterval multiply(CardinalityInterval other) {
return lift(other, (a, b) -> a * b, UpperCardinality::multiply);
}
@Override
public CardinalityInterval meet(CardinalityInterval other) {
return lift(other, Math::max, UpperCardinality::min);
}
@Override
public CardinalityInterval join(CardinalityInterval other) {
return lift(other, Math::min, UpperCardinality::max, this);
}
@Override
public CardinalityInterval take(int count) {
int newLowerBound = Math.max(lowerBound - count, 0);
var newUpperBound = upperBound.take(count);
if (newUpperBound == null) {
return CardinalityIntervals.ERROR;
}
return CardinalityIntervals.between(newLowerBound, newUpperBound);
}
private CardinalityInterval lift(CardinalityInterval other, IntBinaryOperator lowerOperator,
BinaryOperator<UpperCardinality> upperOperator,
CardinalityInterval whenEmpty) {
if (other instanceof NonEmptyCardinalityInterval nonEmptyOther) {
return CardinalityIntervals.between(lowerOperator.applyAsInt(lowerBound, nonEmptyOther.lowerBound),
upperOperator.apply(upperBound, nonEmptyOther.upperBound));
}
if (other instanceof EmptyCardinalityInterval) {
return whenEmpty;
}
throw new IllegalArgumentException("Unknown CardinalityInterval: " + other);
}
private CardinalityInterval lift(CardinalityInterval other, IntBinaryOperator lowerOperator,
BinaryOperator<UpperCardinality> upperOperator) {
return lift(other, lowerOperator, upperOperator, CardinalityIntervals.ERROR);
}
@Override
public String toString() {
if (upperBound instanceof FiniteUpperCardinality finiteUpperCardinality &&
finiteUpperCardinality.finiteUpperBound() == lowerBound) {
return "[%d]".formatted(lowerBound);
}
return "[%d..%s]".formatted(lowerBound, upperBound);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
NonEmptyCardinalityInterval that = (NonEmptyCardinalityInterval) o;
return lowerBound == that.lowerBound && Objects.equals(upperBound, that.upperBound);
}
@Override
public int hashCode() {
return lowerBound * 31 + upperBound.hashCode();
}
}
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