// Constructor
    ArtifactScopeEnum(int id) {
        this.id = id;
    }

    int getId() {
        return id;
    }

    /**
     * Helper method to simplify null processing
     *
     * @param scope a scope or {@code null}
     * @return the provided scope or DEFAULT_SCOPE
     */
    public static ArtifactScopeEnum checkScope(ArtifactScopeEnum scope) {
        return scope == null ? DEFAULT_SCOPE : scope;
    }

     *
     * @param scopes The scopes to enable, along with all implied scopes, may be {@code null}.
     */
    public CumulativeScopeArtifactFilter(Collection<String> scopes) {
        this.scopes = new HashSet<>();

        addScopes(scopes);
    }

    /**
     * Creates a new filter that combines the specified filters.
     *
     * @param filters The filters to combine, may be {@code null}.

 */
public abstract class JarInputStreamUtil {

    /**
     * Do not instantiate.
     */
    protected JarInputStreamUtil() {
    }

    /**
     * Creates a {@link JarInputStream}.
     *
     * @param is the input stream (must not be {@literal null})
     * @return {@link JarInputStream}
     * @throws IORuntimeException if an {@link IOException} occurs
     * @see JarInputStream#JarInputStream(InputStream)
     */

     */
    protected ThreadUtil() {
    }

    /**
     * Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds.
     *
     * @param millis
     *            the length of time to sleep in milliseconds
     * @throws InterruptedRuntimeException
     *             if any thread has interrupted the current thread.
     */

/**
 * Represents the list of core extensions configured at one source. The list is validated (are GA unique), but no
 * other logic than that is applied.
 *
 * @since 4.0.0
 * @param source The source file of core extensions, is never {@code null}.
 * @param coreExtensions The configured core extensions, is never {@code null}. Contents of list is guaranteed to be unique by GA.
 *
 * @see Constants#MAVEN_PROJECT_EXTENSIONS

                cause);
        this.extension = extension;
    }

    /**
     * Constructor accepting the new API type for internal use.
     *
     * @param extension the new API extension
     * @param cause the cause
     */
    public ExtensionResolutionException(org.apache.maven.api.cli.extensions.CoreExtension extension, Throwable cause) {
        super(

    private Map<String, List<File>> collisions;

    /**
     * Creates a new exception with specified details.
     *
     * @param message The message text, may be {@code null}.
     * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
     */
    public DuplicateProjectException(String message, Map<String, List<File>> collisions) {

/**
 * Base class for map testers.
 *
 * <p>TODO: see how much of this is actually needed once Map testers are written. (It was cloned
 * from AbstractCollectionTester.)
 *
 * @param <K> the key type of the map to be tested.
 * @param <V> the value type of the map to be tested.
 * @author George van den Driessche
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")

     *
     * @param url the URL to check
     * @return true if the URL is a file system path, false otherwise
     */
    protected boolean isFileSystemPath(final String url) {
        return ComponentUtil.getProtocolHelper().isFileSystemPath(url);
    }

    /**
     * Validates if the URL is safe for redirection.
     *
     * @param url the URL to validate

   * MultimapBuilder.hashKeys(expectedKeys).arrayListValues(expectedValuesPerKey).build()}, which
   * provides more control over the underlying data structure.
   *
   * @param expectedKeys the expected number of distinct keys
   * @param expectedValuesPerKey the expected average number of values per key
   * @throws IllegalArgumentException if {@code expectedKeys} or {@code expectedValuesPerKey} is
   *     negative
   */