if (!features.contains(methodFeature)) {
        if (stackWithLastReturnedElementAtTop == null) {
          throw PermittedMetaException.UOE_OR_ISE;
        } else {
          throw PermittedMetaException.UOE;
        }
      } else if (stackWithLastReturnedElementAtTop == null) {
        throw PermittedMetaException.ISE;
      }
    }

    private List<E> getElements() {

            }
        } catch (ConnectionException e) {
            throw new TransferFailedException("Connection failed: " + e.getMessage(), e);
        } catch (AuthenticationException e) {
            throw new TransferFailedException("Authentication failed: " + e.getMessage(), e);
        } catch (AuthorizationException e) {
            throw new TransferFailedException("Authorization failed: " + e.getMessage(), e);

                throw new TransferCancelledException();
            }

            @Override
            public void transferProgressed(TransferEvent event) throws TransferCancelledException {
                throw new TransferCancelledException();
            }

            @Override
            public void transferCorrupted(TransferEvent event) throws TransferCancelledException {

        throw new UnsupportedOperationException("Cannot get available versions in this test case");
    }

    public List<ArtifactVersion> retrieveAvailableVersionsFromDeploymentRepository(
            Artifact artifact, ArtifactRepository localRepository, ArtifactRepository remoteRepository)
            throws ArtifactMetadataRetrievalException {

  }

  /**
   * Guaranteed to throw an exception and leave the map unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  @CheckForNull
  public final Entry<K, V> pollFirstEntry() {
    throw new UnsupportedOperationException();
  }

            throw new UnresolvableModelException(e.getMessage(), groupId, artifactId, version, e);
        }

        return new ArtifactModelSource(pomArtifact.getPath(), groupId, artifactId, version);
    }

    @Override
    public ModelSource resolveModel(final Parent parent, final AtomicReference<Parent> modified)
            throws UnresolvableModelException {
        try {

            throw new XmlPullParserException(e.getMessage(), null, e);
        }
    }

    /**
     * @param reader a reader object.
     * @throws IOException IOException if any.
     * @throws XmlPullParserException XmlPullParserException if
     * any.
     * @return Model
     */
    public Settings read(Reader reader) throws IOException, XmlPullParserException {
        try {

@GwtCompatible
public enum MapFeature implements Feature<Map> {
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code containsKey(null)},
   * {@code get(null)}, {@code keySet().contains(null)} or {@code remove(null)}.
   */
  ALLOWS_NULL_KEY_QUERIES,
  ALLOWS_NULL_KEYS(ALLOWS_NULL_KEY_QUERIES),
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code

            throw new TransferCancelledException();
        }
        put(event, false);
    }

    @Override
    public void transferCorrupted(TransferEvent event) throws TransferCancelledException {
        if (ongoing.get(new TransferResourceIdentifier(event.getResource())) == Boolean.FALSE) {
            throw new TransferCancelledException();
        }
        put(event, false);

        if (result.hasVersionRangeViolations()) {
            throw result.getVersionRangeViolation(0);
        }

        // Transfer Error

        if (result.hasErrorArtifactExceptions()) {
            throw result.getErrorArtifactExceptions().get(0);
        }

        if (result.hasMissingArtifacts()) {
            throw new MultipleArtifactsNotFoundException(
                    request.getArtifact(),