import org.eclipse.aether.artifact.ArtifactProperties;
import org.eclipse.aether.artifact.ArtifactType;

import static java.util.Objects.requireNonNull;

/**
 * Default implementation of {@link Type} and Resolver {@link ArtifactType}.
 *
 * @since 4.0.0
 */
public class DefaultType implements Type, ArtifactType {
    private final String id;
    private final Language language;

 * There are several issues/discussions regarding how "aggregator" plugins should be handled.
 * Read for instance http://docs.codehaus.org/display/MAVEN/Deterministic+Lifecycle+Planning
 * </p>
 * <p>
 * In their current implementation they are "bolted" onto the lifecycle by separating them
 * into TaskSegments. This class represents the execution context of one such task segment.
 * </p>
 * <p>

import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;

/**
 * Test cases for the project {@code ModelResolver} implementation.
 */
class DefaultModelResolverTest {

    Session session;

    @BeforeEach
    void setup() {
        Path basedir = Paths.get(System.getProperty("basedir", ""));

  of required artifacts and other classpath elements, this is assumed by the
  mojo API to be in a correct state, and will be handled by the Wagon
  modifications.


* Implementation Notes

** Accessibility of offline status

  Offline status should be indicated in the MavenSettings instance, since it
  can conceivably be set from either the settings.xml or the command-line.

    private final ProjectsSelector projectsSelector = new DefaultProjectsSelector(projectBuilder);

    // Not using mocks for these strategies - a mock would just copy the actual implementation.

    private final ModelLocator modelLocator = new DefaultModelLocator();
    private final PomlessCollectionStrategy pomlessCollectionStrategy = new PomlessCollectionStrategy(projectBuilder);

import java.util.Arrays;
import java.util.Deque;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Objects;
import java.util.Properties;

/**
 * <p>
 * Generic implementation of version comparison.
 * </p>
 * <p>
 * Features:
 * <ul>
 * <li>mixing of '<code>-</code>' (hyphen) and '<code>.</code>' (dot) separators,</li>

    }

    @Nonnull
    @Override
    public Collection<Listener> getListeners() {
        return Collections.unmodifiableCollection(listeners);
    }

    //
    // Shortcut implementations
    //

    /**
     * Shortcut for <code>getService(RepositoryFactory.class).createLocal(...)</code>
     *
     * @see RepositoryFactory#createLocal(Path)
     */
    @Override

 * One notable exception is the computation of the early {@code session.rootDirectory}
 * property which happens very early.  The implementation used in this case
 * will be discovered using the JDK service mechanism.
 *
 * The default implementation will look for a {@code .mvn} child directory
 * or a {@code pom.xml} containing the {@code root="true"} attribute.
 */
public interface RootLocator {

import java.util.Objects;
import java.util.Properties;

import org.apache.maven.toolchain.model.ToolchainModel;
import org.slf4j.Logger;

/**
 * Default abstract toolchain implementation, to be used as base class for any toolchain implementation
 * to avoid rewriting usual code.
 *
 * @since 2.0.9
 */
public abstract class DefaultToolchain // should have been AbstractToolchain...
implements Toolchain, ToolchainPrivate {

import java.util.ArrayList;
import java.util.List;

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.model.Model;
import org.apache.maven.model.Repository;

/**
 * A stub implementation to bypass artifact resolution from repositories.
 *
 */
public class EmptyProjectBuildingHelper implements ProjectBuildingHelper {

    public List<ArtifactRepository> createArtifactRepositories(