return false;
    }

    @Override
    public boolean isLeaf() {
        return node.children().isEmpty();
    }

    @Override
    public void setValue(Object value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public NodeIterator childIterator(NodeTest test, boolean reverse, NodePointer startWith) {

            return null;
        } else if (since instanceof SinceTagStatus.Missing) {
            return acceptOrReject(member, Violation.error(member, SINCE_ERROR_MESSAGE + getCurrentVersion()));
        } else {
            throw new IllegalStateException("Unknown status: " + since);
        }
    }

    private boolean shouldSkipViolationCheckFor(JApiCompatibility member) {
        return !isClassFieldConstructorOrMethod(member) ||

        for (Lifecycle lifecycle : this) {
            Set<String> set = new HashSet<>();
            lifecycle.allPhases().forEach(phase -> {
                if (!set.add(phase.name())) {
                    throw new IllegalArgumentException(
                            "Found duplicated phase '" + phase.name() + "' in '" + lifecycle.id() + "' lifecycle");
                }
            });
        }
    }

    @Override

 * under the License.
 */
package org.apache.maven.model.building;

/**
 * Describes a problem that was encountered during model building. A problem can either be an exception that was thrown
 * or a simple string message. In addition, a problem carries a hint about its source, e.g. the POM file that exhibits
 * the problem.
 *
 * @deprecated use {@code org.apache.maven.api.services.ModelBuilder} instead
 */

        HashMap<String, LifecyclePhase> defaultBindings = null;
        if (pluginBindings != null) {
            final int len = pluginBindings.length;

            if (len < 2 || len % 2 != 0) {
                throw new IllegalArgumentException("Plugin bindings must have more than 0, even count of elements");
            }

            defaultBindings = new LinkedHashMap<>(len / 2);

            for (int i = 0; i < len; i += 2) {

        public void setSourceLevel(String sourceLevel) {
            if (sourceLevelSet) {
                throw new IllegalStateException("Cannot reset sourceLevel attribute; it is already set to: " + sourceLevel);
            } else if (!(USER_LEVEL.equals(sourceLevel) || GLOBAL_LEVEL.equals(sourceLevel))) {
                throw new IllegalArgumentException("sourceLevel must be one of: {" + USER_LEVEL + "," + GLOBAL_LEVEL + "}");
            } else {

    @Override
    public ResolutionGroup retrieve(
            Artifact artifact, ArtifactRepository localRepository, List<ArtifactRepository> remoteRepositories) {
        throw new UnsupportedOperationException("Cannot retrieve metadata in this test case");
    }

    @Override
    public List<ArtifactVersion> retrieveAvailableVersions(

        Model model = new Model();
        model.addProperty("key1", "value1");
        model.addProperty("key2", "value2");
        assertEquals(2, model.getProperties().size());

        // This should not throw NullPointerException
        model.getProperties().clear();
        assertEquals(0, model.getProperties().size());
    }

        Objects.requireNonNull(projectRealm, "projectRealm cannot be null");

        if (cache.containsKey(key)) {
            throw new IllegalStateException("Duplicate project realm for extensions " + key);
        }

        CacheRecord record = new CacheRecord(projectRealm, extensionArtifactFilter);

        cache.put(key, record);

        try {
            return doCleanArgs(args);
        } catch (RuntimeException e) {
            for (String a : args) {
                System.out.println("Arg: '" + a + "'");
            }
            throw e;
        }
    }

    private static String[] doCleanArgs(String[] args) {
        List<String> cleaned = new ArrayList<>();

        StringBuilder currentArg = null;

        for (String arg : args) {