* @param allowStubModel A flag controlling the case of a missing POM artifact. If {@code true} and the specified
     *            POM artifact does not exist, a simple stub model will be returned. If {@code false}, an exception will
     *            be thrown.
     * @param request The project building request that holds further parameters, must not be {@code null}.

import org.eclipse.aether.transport.file.FileTransporterFactory;
import org.eclipse.aether.util.version.GenericVersionScheme;
import org.eclipse.aether.version.VersionScheme;

/**
 * A simple memorizing {@link Supplier} of {@link RepositorySystem} instance, that on first call
 * supplies lazily constructed instance, and on each subsequent call same instance. Hence, this instance should be

 * A {@code PathType} can identify the Java class-path, the Java module-path,
 * or another kind of path for another programming language for example.
 * Path types are often exclusive. For example, a dependency should not be
 * both on the Java class-path and on the Java module-path.
 *
 * @see org.apache.maven.api.services.DependencyResolverResult#getDispatchedPaths()
 *
 * @since 4.0.0

     * The integration tests for MNG-6223 are examples for this scenario.
     *
     * @return true if the collected projects contain the requested project (for example with -f)
     */
    private boolean isRequestedProjectCollected(MavenExecutionRequest request, List<MavenProject> projects) {
        return projects.stream().map(MavenProject::getFile).anyMatch(request.getPom()::equals);

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

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Simple {@link ThreadFactory} implementation that ensures the corresponding threads have a meaningful name.
 */
public class BuildThreadFactory implements ThreadFactory {
    private final AtomicInteger id = new AtomicInteger();

 *
 * @since 4.0.0
 */
@Experimental
@Consumer
public interface VersionRangeResolver extends Service {

    /**
     * Expands a version range to a list of matching versions, in ascending order.
     * For example, resolves "[3.8,4.0)" to "3.8", "3.8.1", "3.8.2".
     * The returned list of versions is only dependent on the configured repositories and their contents.

                    type.getPathTypes().contains(JavaPathType.CLASSES));
            // TODO: watch out for module path
        });

        // Note: here, type decides is artifact added to "build path" (for example during resolution)
        // and "build path" is intermediate data that is used to create actual Java classpath/modulepath
        // but to create those, proper filtering should happen via Type properties.
    }

     */
    public boolean encloses(ArtifactScopeEnum scope) {
        final ArtifactScopeEnum s = checkScope(scope);

        // system scope is historic only - and simple
        if (id == system.id) {
            return scope.id == system.id;
        }

        for (ArtifactScopeEnum[][] set : COMPLIANCY_SETS) {
            if (id == set[0][0].id) {

import org.apache.maven.api.model.Model;
import org.apache.maven.api.services.ModelProblem;

/**
 * Describes a problem that was encountered during model building. A problem can either be an exception that was thrown
 * or a simple string message. In addition, a problem carries a hint about its source, e.g. the POM file that exhibits
 * the problem.
 *
 */
public class DefaultModelProblem implements ModelProblem {

    private final String source;

    @Nonnull
    PathScope getPathScope();

    /**
     * Returns a filter for the types of path (class-path, module-path, …) accepted by the tool.
     * For example, if a Java tools accepts only class-path elements, then the filter should return
     * {@code true} for {@link JavaPathType#CLASSES} and {@code false} for {@link JavaPathType#MODULES}.