Mapping ConstraintViolatation paths to JSON Pointer and JSON Path

ConstraintViolationPathUtils.java

import com.fasterxml.jackson.core.JsonPointer;

import javax.validation.ElementKind;
import javax.validation.Path;
import javax.validation.Path.Node;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

/**
 * This has not been extensively tested. It's just a starting point. Please improve!
 */
public class ConstraintViolationPathUtils {
  public static String toJsonPointer(Path path) {
    return StreamSupport.stream(path.spliterator(), false)
        .filter(p -> p.getKind().equals(ElementKind.BEAN) || p.getKind().equals(ElementKind.PROPERTY))
        // If this is an element in an iterable, we want represent it by 2 path segments, the index
        // then the element name
        .flatMap(n -> n.isInIterable() ? Stream.of(n.getIndex(), n.getName()) : Stream.of(n.getName()))
        .map(n -> JsonPointer.compile("/" + n))
        .reduce(JsonPointer.compile("/"), JsonPointer::append)
        .toString();
  }

  public static String toJsonPath(Path path) {
    return StreamSupport.stream(path.spliterator(), false)
        .filter(p -> p.getKind().equals(ElementKind.BEAN) || p.getKind().equals(ElementKind.PROPERTY))
        .map(Node::toString)
        .reduce("$", (s1, s2) -> s1 + "." + s2);
  }
}