import javax.crypto.spec.SecretKeySpec;
import javax.security.auth.kerberos.KerberosKey;

/**
 * Utility class for calculating and verifying PAC (Privilege Attribute Certificate) message authentication codes.
 * This class provides methods for computing MACs using various Kerberos encryption types including
 * ARCFOUR-HMAC-MD5 and AES-based HMAC algorithms.
 */
public class PacMac {

    /**

     *
     * @return {@code true} if the artifact is a snapshot, {@code false} otherwise
     * @see org.apache.maven.api.Session#isVersionSnapshot(String)
     */
    boolean isSnapshot();

    /**
     * {@return coordinates with the same identifiers as this artifact}.
     * This is a shortcut for {@code session.createArtifactCoordinates(artifact)}.
     *

    }

    /**
     * Returns <code>true</code> if the class loader <code>other</code> is an ancestor of the class loader <code>cl</code>.
     *
     * @param cl
     *            the class loader
     * @param other
     *            the class loader to check as ancestor
     * @return <code>true</code> if <code>other</code> is an ancestor of <code>cl</code>
     */

          if (c != '\\'.code) {
            append(c.toChar())
            continue
          }
          when (buffer.readUtf8CodePoint()) {
            '\\'.code -> append('\\')
            '#'.code -> append('#')
            'n'.code -> append('\n')
            'r'.code -> append('\r')
            's'.code -> append(' ')
            't'.code -> append('\t')
            'f'.code -> append('\u000c')

     * </pre>
     *
     * @param str
     *            the string (can be <code>null</code>)
     * @param defaultStr
     *            the string to return if the argument is <code>null</code> (can be <code>null</code>)
     * @return the given string, or the specified default string if the argument is <code>null</code>
     */
    public static String defaultString(final String str, final String defaultStr) {

    /**
     * Creates a user-friendly artifact id from the specified coordinates.
     *
     * @param groupId The group id, may be {@code null}.
     * @param artifactId The artifact id, may be {@code null}.
     * @param version The version, may be {@code null}.
     * @return The user-friendly artifact id, never {@code null}.
     */
    static String toId(String groupId, String artifactId, String version) {

    /**
     * Builds the effective settings of the specified settings files.
     *
     * @param request the settings building request that holds the parameters, must not be {@code null}
     * @return the result of the settings building, never {@code null}
     * @throws SettingsBuilderException if the effective settings could not be built
     */
    @Nonnull
    SettingsBuilderResult build(@Nonnull SettingsBuilderRequest request);

        Encoding.PERCENT,
        '['.code,
        ']'.code,
        '{'.code,
        '}'.code,
        '|'.code,
        '^'.code,
        '\''.code,
        ';'.code,
        '='.code,
        '@'.code,
      ).override(
        Encoding.SKIP,
        ':'.code,
        '/'.code,
        '\\'.code,
        '?'.code,
        '#'.code,

     *            <code>null</code>.
     * @param parent The (read-only) parent model from which to inherit the values, may be <code>null</code>.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    void assembleModelInheritance(

    }

    /**
     * Returns the resource as a stream from the context class loader.
     * Returns <code>null</code> if the resource is not found.
     *
     * @param path
     *            The resource path. Must not be {@literal null} or empty string.
     * @return The input stream, or <code>null</code> if not found.
     * @see #getResourceAsStreamNoException(String, String)
     */