nl.vpro.util.Ranges Maven / Gradle / Ivy
package nl.vpro.util;
import java.util.function.Function;
import org.checkerframework.checker.nullness.qual.Nullable;
import com.google.common.collect.Range;
public class Ranges {
private Ranges() {
}
/**
* Creates on {@link Range#openClosed(Comparable, Comparable)} range, but the arguments can be {@code null}
* in which case unbounded ranges are created
* @since 2.29.1
* @see Range#closedOpen(Comparable, Comparable)
* @throws IllegalArgumentException if {@code lower} is greater than {@code upper}
*/
public static > Range closedOpen(@Nullable C start, @Nullable C stop) {
if(start == null) {
if (stop == null) {
return Range.all();
} else {
return Range.lessThan(stop);
}
} else if (stop == null) {
return Range.atLeast(start);
} else {
return Range.closedOpen(
start,
stop
);
}
}
/**
* Creates on {@link Range#closed(Comparable, Comparable)} range, but the arguments can be {@code null}
* in which case unbounded ranges are created
* @since 2.29.3
* @see Range#closed(Comparable, Comparable)
* @throws IllegalArgumentException if {@code lower} is greater than {@code upper}
*/
public static > Range closedClosed(@Nullable C start, @Nullable C stop) {
if(start == null) {
if (stop == null) {
return Range.all();
} else {
return Range.atMost(stop);
}
} else if (stop == null) {
return Range.atLeast(start);
} else {
return Range.closed(
start,
stop
);
}
}
public static , D extends Comparable> Range convert(Range in, Function convertor) {
if (in.hasLowerBound()) {
if (in.hasUpperBound()) {
D lower = convertor.apply(in.lowerEndpoint());
D upper = convertor.apply(in.upperEndpoint());
if (lower.compareTo(upper) > 0) {
return Range.range(
upper, in.upperBoundType(),
lower, in.lowerBoundType()
);
} else {
return Range.range(
lower, in.lowerBoundType(),
upper, in.upperBoundType()
);
}
} else {
return Range.downTo(convertor.apply(in.lowerEndpoint()), in.lowerBoundType());
}
} else {
if (in.hasUpperBound()) {
return Range.upTo(convertor.apply(in.upperEndpoint()), in.upperBoundType());
} else {
return Range.all();
}
}
}
}