org.zalando.riptide.autoconfigure.Ratio Maven / Gradle / Ivy
package org.zalando.riptide.autoconfigure;
import lombok.AllArgsConstructor;
import lombok.Getter;
import java.util.Optional;
import java.util.function.BiConsumer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
@AllArgsConstructor
@Getter
final class Ratio {
private static final Pattern PATTERN = Pattern.compile("(\\d+)(?:(?:(?: +(?:out )?+of +)|(?: */ *))?(\\d+))?");
private final int amount;
private final int total;
// used by SnakeYAML
@SuppressWarnings("unused")
public Ratio(final Integer value) {
this(value.toString());
}
// used by SnakeYAML
@SuppressWarnings("unused")
public Ratio(final String value) {
this(Ratio.valueOf(value));
}
private Ratio(final Ratio ratio) {
this(ratio.amount, ratio.total);
}
void applyTo(final BiConsumer consumer) {
consumer.accept(amount, total);
}
static Ratio valueOf(final String value) {
final Matcher matcher = PATTERN.matcher(value);
if (!matcher.matches()) {
throw new IllegalArgumentException("'" + value + "' is not a valid ratio");
}
final int amount = Integer.parseInt(matcher.group(1));
final int total = Optional.ofNullable(matcher.group(2)).map(Integer::parseInt).orElse(amount);
return new Ratio(amount, total);
}
}