class CoreUtils {

    public static <T> T cast(Class<T> clazz, Object o, String name) {
        if (!clazz.isInstance(o)) {
            if (o == null) {
                throw new IllegalArgumentException(name + " is null");
            }
            throw new IllegalArgumentException(name + " is not an instance of " + clazz.getName());
        }
        return clazz.cast(o);
    }

    void testHandleExceptionAetherClassNotFound() {
        Throwable cause2 = new NoClassDefFoundError("org/sonatype/aether/RepositorySystem");
        Plugin plugin = new Plugin();
        Exception cause = new PluginContainerException(plugin, null, null, cause2);
        PluginDescriptor pluginDescriptor = new PluginDescriptor();
        MojoDescriptor mojoDescriptor = new MojoDescriptor();
        mojoDescriptor.setPluginDescriptor(pluginDescriptor);

            // TODO Hack to make the cycle detection the same for the new graph builder
            if (e.getCause() instanceof ProjectCycleException) {
                result = addExceptionToResult(new DefaultMavenExecutionResult(), e.getCause());
            } else {
                result = addExceptionToResult(
                        new DefaultMavenExecutionResult(), new InternalErrorException("Internal error: " + e, e));
            }

        toolchain = new ToolchainModel();
        toolchain.setType("TYPE");
        toolchain.setProvides(props);
        PersistedToolchains globalResult = new PersistedToolchains();
        globalResult.setToolchains(Collections.singletonList(toolchain));

        ToolchainsBuildingRequest request = new DefaultToolchainsBuildingRequest();
        request.setUserToolchainsSource(

        if (listener == null) {
            return null;
        } else {
            return new TransferListenerAdapter(listener);
        }
    }

    private TransferListenerAdapter(ArtifactTransferListener listener) {
        this.listener = listener;
        this.artifacts = new IdentityHashMap<>();
        this.transfers = new IdentityHashMap<>();
    }

    @Override
    public void debug(String message) {}

            excludedArtifacts = new LinkedHashSet<>(coreArtifacts);
        }
        return excludedArtifacts;
    }

    /**
     * Returns the artifact filter for the core + extension artifacts.
     *
     * @see org.apache.maven.ArtifactFilterManager#getArtifactFilter()
     */
    @Override
    public ArtifactFilter getArtifactFilter() {
        Set<String> excludes = new LinkedHashSet<>(getExcludedArtifacts());

            String artifactBasedir = new File(getBasedir(), "src/test/resources/artifact-install").getAbsolutePath();

            Artifact artifact = createArtifact("artifact", "1.0");

            File file = new File(artifactBasedir, "artifact-1.0.jar");
            assertEquals("dummy", new String(Files.readAllBytes(file.toPath()), StandardCharsets.UTF_8).trim());

                currentSegment.getTasks().add(new GoalTask(task));
            } else {
                // lifecycle phase
                if (currentSegment == null || currentSegment.isAggregating()) {
                    currentSegment = new TaskSegment(false);
                    taskSegments.add(currentSegment);
                }
                currentSegment.getTasks().add(new LifecycleTask(task));
            }
        }

    private setup() {
        docsRoot = new File(projectDir, "docsRoot")
        new File(docsRoot, 'javadoc').mkdirs()
        sampleDoc = new File(docsRoot, "sample.adoc")

        new File(projectDir,"build/working/samples/docs").mkdirs()
        sampleSampleDoc = new File(projectDir, "build/working/samples/docs/sample_sample.adoc")

        new File(projectDir,"build/working/release-notes").mkdirs()

var errDoneForNow = errors.New("done for now")

// errSkipFile returned by the fn() for readDirFn() when it needs
// to proceed to next entry.
var errSkipFile = errors.New("skip this file")

var errIgnoreFileContrib = errors.New("ignore this file's contribution toward data-usage")

// errXLBackend XL drive mode requires fresh deployment.
var errXLBackend = errors.New("XL backend requires fresh drive")