need it so that empty directory does not get deleted...

 * under the License.
 */
package org.apache.maven.lifecycle.internal;

/**
 * A task that is a lifecycle.
 * <p>
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *
 * @since 3.0
 */
public final class LifecycleTask extends Task {
    public LifecycleTask(String lifecyclePhase) {
        super(lifecyclePhase);
    }

/**
 * <p>
 * Component interface responsible for creation of MavenProject#dependencyArtifacts instances.
 * </p>
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *
 * @since 3.2.4
 */
public interface ProjectArtifactFactory {
    Set<Artifact> createArtifacts(MavenProject project) throws InvalidDependencyVersionException;

 * Assists in firing execution events. <strong>Warning:</strong> This is an internal utility interface that is only
 * public for technical reasons, it is not part of the public API. In particular, this interface can be changed or
 * deleted without prior notice.
 *
 */
public interface ExecutionEventCatapult {

    void fire(ExecutionEvent.Type eventType, MavenSession session, MojoExecution mojoExecution);

import org.apache.maven.execution.MavenExecutionResult;

/**
 * Context that is fixed for the entire reactor build.
 *
 * @since 3.0
 *         NOTE: This class is not part of any public api and can be changed or deleted without prior notice.
 */
public class ReactorContext {
    private final MavenExecutionResult result;

    private final ClassLoader originalContextClassLoader;

import org.apache.maven.lifecycle.internal.builder.BuilderCommon;
import org.apache.maven.project.MavenProject;

/**
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *
 * @since 3.0
 */
@Named
@Singleton
public class BuildListCalculator {
    public ProjectBuildList calculateProjectBuilds(MavenSession session, List<TaskSegment> taskSegments) {

import org.apache.maven.project.MavenProject;

/**
 * <p>
 * Provides the positional index of the project
 * </p>
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *
 * @since 3.0
 */
// TODO Kristian wonders if this class really is necessary and if it overlaps other concepts.
public final class ProjectIndex {

/**
 * Assists the project builder. <strong>Warning:</strong> This is an internal utility class that is only public for
 * technical reasons, it is not part of the public API. In particular, this class can be changed or deleted without
 * prior notice.
 *
 * @since 3.0
 */
public class EnvironmentUtils {

    private static Properties envVars;

    /**

/**
 * Caches project class realms. <strong>Warning:</strong> This is an internal utility interface that is only public for
 * technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted without
 * prior notice.
 *
 */
public interface ProjectRealmCache {

    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    /**

/**
 * Caches extension class realms. <strong>Warning:</strong> This is an internal utility interface that is only public
 * for technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted
 * without prior notice.
 *
 */
public interface ExtensionRealmCache {
    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    /**