volatile Exception exception;

    public BuildStep(String name, MavenProject project, Lifecycle.Phase phase) {
        this.name = Objects.requireNonNull(name, "name cannot be null");
        this.project = Objects.requireNonNull(project, "project cannot be null");
        this.phase = phase;
    }

    public boolean isCreated() {
        return status.get() == CREATED;
    }

    public boolean isDone() {

 * XML reader and writer classes for Maven POM, generated from <code>maven.mdo</code> model.
 * These classes use
 * <a href="https://codehaus-plexus.github.io/plexus-utils/apidocs/org/codehaus/plexus/util/xml/pull/package-summary.html">plexus-utils'
 * XML Pull Parser API</a> for their internal XML handling and
 * <a href="https://codehaus-plexus.github.io/plexus-utils/apidocs/org/codehaus/plexus/util/xml/Xpp3DomBuilder.html">Xpp3DomBuilder</a> +

 */
class MailingListTest {

    @Test
    void testHashCodeNullSafe() {
        new MailingList().hashCode();
    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(new MailingList().equals(null));

        new MailingList().equals(new MailingList());
    }

    @Test
    void testEqualsIdentity() {
        MailingList thing = new MailingList();

                            + repository.getId() + " (" + repository.getUrl() + ")");
        }

        if (file == null) {
            // TODO throw something instead?
            return true;
        }

        Date lastCheckDate = readLastUpdated(metadata, repository, file);

        return (lastCheckDate == null) || policy.checkOutOfDate(lastCheckDate);
    }

/**
 * Assists in handling repository metadata.
 *
 */
@Deprecated
class MetadataUtils {

    public static Metadata cloneMetadata(Metadata src) {
        if (src == null) {
            return null;
        }
        return src.clone();
    }

            throws IOException, DomTripException {

        Element rootElement = parentPom.root();
        if (rootElement == null) {
            return;
        }

        // Find modules element
        Element modulesElement = rootElement.child(MODULES).orElse(null);
        if (modulesElement == null) {
            return;
        }

        // Process each module

         * expression from properties only.
         */
        if (value != null && type != null && !(value instanceof String) && !isTypeCompatible(type, value)) {
            value = null;
        }

        if (value == null) {
            // The CLI should win for defining properties

            if (properties != null) {
                // We will attempt to get nab a property as a way to specify a parameter

        result = 37 * result + getArtifactId().hashCode();
        result = 37 * result + getType().hashCode();
        if (getVersion() != null) {
            result = 37 * result + getVersion().hashCode();
        }
        result = 37 * result + (getClassifier() != null ? getClassifier().hashCode() : 0);

        return result;
    }

    /** {@inheritDoc} */
    @Override

interface ModelCacheTag<T> {

    /**
     * Gets the name of the tag.
     *
     * @return The name of the tag, must not be {@code null}.
     */
    String getName();

    /**
     * Gets the type of data associated with this tag.
     *
     * @return The type of data, must not be {@code null}.
     */
    Class<T> getType();

    /**

     * The id uniquely identifies this <i>dependency type</i>.
     *
     * @return the id of this type, never {@code null}.
     */
    @Nonnull
    @Override
    String id();

    /**
     * Returns the dependency type language.
     *
     * @return the language of this type, never {@code null}.
     */
    @Nonnull
    Language getLanguage();

    /**