// even before the arguments from the command line are parsed.  Any exception
            // that would happen here should cause the build to fail at a later stage
            // (when actually parsing the POM) and will lead to a better exception being
            // displayed to the user, so just bail out and return false.
        }
        return false;
    }

        if (lookup == null) {
            return customLifecycles != null ? customLifecycles : new HashMap<>();
        }

        // Lifecycles cannot be cached as extensions might add custom lifecycles later in the execution.
        try {
            Map<String, Lifecycle> lifecycles = new HashMap<>(lookup.lookupMap(Lifecycle.class));
            for (org.apache.maven.api.Lifecycle lf : registry) {

import org.apache.maven.api.annotations.Nonnull;

/**
 * Collects, flattens and resolves dependencies.
 */
@Experimental
public interface DependencyResolver extends Service {

    List<Node> flatten(Session session, Node node, PathScope scope) throws DependencyResolverException;

    /**
     * This method collects, flattens and resolves the dependencies.
     *
     * @param request the request to resolve

/**
 * Component for use by the <code>maven-toolchains-plugin</code> only.
 * It provides API: <ol>
 * <li>to retrieve every toolchains available in user settings,</li>
 * <li>to store chosen toolchain into build context for later use by toolchain-aware plugins.</li>
 * </ol>
 *
 * @since 2.0.9
 * @see ToolchainManager#getToolchainFromBuildContext(String, MavenSession)
 */
public interface ToolchainManagerPrivate {

    /**

                request.addArtifact(pomArtifact);
            } else if (metadata instanceof SnapshotArtifactRepositoryMetadata
                    || metadata instanceof ArtifactRepositoryMetadata) {
                // eaten, handled by repo system
            } else {
                request.addMetadata(new MetadataBridge(metadata));
            }
        }

        try {
            repoSystem.install(session, request);

import static org.apache.maven.internal.impl.Utils.nonNull;

@Named
@Singleton
public class DefaultDependencyResolver implements DependencyResolver {

    @Override
    public List<Node> flatten(Session s, Node node, PathScope scope) throws DependencyResolverException {
        InternalSession session = InternalSession.from(s);
        DependencyNode root = cast(AbstractNode.class, node, "node").getDependencyNode();

                request.addArtifact(pomArtifact);
            } else if (metadata instanceof SnapshotArtifactRepositoryMetadata
                    || metadata instanceof ArtifactRepositoryMetadata) {
                // eaten, handled by repo system
            } else {
                request.addMetadata(new MetadataBridge(metadata));
            }
        }

            return null;
        }
        return tryParseInt(s);
    }

    private static Integer tryParseInt(String s) {
        // for performance, check digits instead of relying later on catching NumberFormatException
        if (!isDigits(s)) {
            return null;
        }

        try {
            long longValue = Long.parseLong(s);
            if (longValue > Integer.MAX_VALUE) {