* Provides some metadata operations, like querying the remote repository for a list of versions available for an
 * artifact.
 *
 */
@Deprecated
public interface MetadataSource {
    String ROLE = MetadataSource.class.getName();

    MetadataResolution retrieve(
            ArtifactMetadata artifact, ArtifactRepository localRepository, List<ArtifactRepository> remoteRepositories)
            throws MetadataRetrievalException;

    }

    static <T> T nonNull(T t, String name) {
        if (t == null) {
            throw new IllegalArgumentException(name + " cannot be null");
        }
        return t;
    }

    static <T> T cast(Class<T> clazz, Object o, String name) {
        if (!clazz.isInstance(o)) {
            if (o == null) {
                throw new IllegalArgumentException(name + " is null");
            }

        if (mojoDescriptor.getParameters() != null) {
            for (Parameter param : mojoDescriptor.getParameters()) {
                if (param.isRequired()) {
                    missingParameters.put(param.getName(), param);
                }
            }
        }
    }

    public Collection<Parameter> getMissingParameters() {
        return missingParameters.values();
    }

import org.apache.maven.settings.Settings;
import org.codehaus.plexus.component.repository.exception.ComponentLookupException;

/**
 */
@Deprecated
public interface PluginManager {
    String ROLE = PluginManager.class.getName();

    void executeMojo(MavenProject project, MojoExecution execution, MavenSession session)
            throws MojoExecutionException, ArtifactResolutionException, MojoFailureException, ArtifactNotFoundException,

     * @deprecated Use {@link #DebugConfigurationListener(Logger)} instead.
     */
    @Deprecated
    public DebugConfigurationListener(org.codehaus.plexus.logging.Logger logger) {
        this(LoggerFactory.getLogger(logger.getName()));
    }

    public DebugConfigurationListener(Logger logger) {
        this.logger = logger;
    }

    public void notifyFieldChangeUsingSetter(String fieldName, Object value, Object target) {

            Parameter parameter,
            PlexusConfiguration pomConfiguration,
            ExpressionEvaluator expressionEvaluator) {
        PlexusConfiguration config = pomConfiguration.getChild(parameter.getName(), false);

        if (isValueSet(config, expressionEvaluator)) {
            pluginValidationManager.reportPluginMojoValidationIssue(
                    PluginValidationManager.IssueLocality.INTERNAL,

        return (Path) Proxy.newProxyInstance(
                ExclusionArtifactFilter.class.getClassLoader(), new Class[] {Path.class}, (proxy1, method, args) -> {
                    if ("toString".equals(method.getName())) {
                        return value;
                    }
                    throw new UnsupportedOperationException();
                });
    }

            }
        }
    }

    private void logError(String action, Throwable e, EventSpy spy) {
        String msg = "Failed to " + action + " spy " + spy.getClass().getName() + ": " + e.getMessage();

        if (logger.isDebugEnabled()) {
            logger.warn(msg, e);
        } else {
            logger.warn(msg);
        }
    }

import java.util.List;

/**
 * Convenience interface for plugins to add or replace artifacts and resources on projects.
 */
public interface MavenProjectHelper {
    String ROLE = MavenProjectHelper.class.getName();

    /**
     * See {@link #attachArtifact(MavenProject, String, String, java.io.File)}, but with type set to null.
     * @param project project reference.
     * @param artifactFile artifact file.

 * A facade that provides lifecycle services to components outside Maven core.
 *
 */
public interface LifecycleExecutor {

    // USED BY MAVEN HELP PLUGIN
    @Deprecated
    String ROLE = LifecycleExecutor.class.getName();

    // For a given project packaging find all the plugins that are bound to any registered
    // lifecycles. The project builder needs to now what default plugin information needs to be