* @since 5.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public final class HostSpecifier {

  private final String canonicalForm;

  private HostSpecifier(String canonicalForm) {
    this.canonicalForm = canonicalForm;
  }

  /**
   * Returns a {@code HostSpecifier} built from the provided {@code specifier}, which is already

 * @since 5.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public final class HostSpecifier {

  private final String canonicalForm;

  private HostSpecifier(String canonicalForm) {
    this.canonicalForm = canonicalForm;
  }

  /**
   * Returns a {@code HostSpecifier} built from the provided {@code specifier}, which is already

    // Throws exception if not working correctly
    HostSpecifier unused = HostSpecifier.fromValid(spec);
    unused = HostSpecifier.from(spec);
    assertTrue(HostSpecifier.isValid(spec));
  }

  private void assertBad(String spec) {
    try {
      HostSpecifier.fromValid(spec);
      fail("Should have thrown IllegalArgumentException: " + spec);
    } catch (IllegalArgumentException expected) {
    }