// test restricting empty sets
        range1 = VersionRange.createFromVersionSpec("[,1.1],[1.4,]");
        range2 = VersionRange.createFromVersionSpec("[1.2,1.3]");
        range1 = range1.restrict(range2);
        mergedRange = range1.restrict(range2);
        assertNull(mergedRange.getRecommendedVersion(), CHECK_VERSION_RECOMMENDATION);

import org.apache.maven.api.services.ProjectBuilder;
import org.apache.maven.api.services.ProjectBuilderRequest;
import org.apache.maven.api.services.SettingsBuilder;
import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
import org.apache.maven.bridge.MavenRepositorySystem;
import org.apache.maven.execution.DefaultMavenExecutionRequest;
import org.apache.maven.execution.DefaultMavenExecutionResult;

     *     <li>"e(G:A:V)" - predicate filter (leaves out G:A:V from range, if hit, V can be range)</li>
     * </ul>
     * Example filter expression: {@code "h(5);s;e(org.foo:bar:1)} will cause: ranges are filtered for "top 5" (instead
     * full range), snapshots are banned if root project is not a snapshot, and if range for {@code org.foo:bar} is
     * being processed, version 1 is omitted.
     *
     * @since 4.0.0

import org.apache.maven.artifact.DefaultArtifact;
import org.apache.maven.artifact.InvalidRepositoryException;
import org.apache.maven.artifact.handler.ArtifactHandler;
import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
import org.apache.maven.artifact.repository.Authentication;

import org.codehaus.plexus.logging.Logger;
import org.eclipse.aether.ConfigurationProperties;
import org.eclipse.aether.util.ConfigUtils;

// TODO remove the update check manager
// TODO separate into retriever and publisher
// TODO remove hardcoding of checksum logic

/**
 * Manages <a href="https://maven.apache.org/wagon">Wagon</a> related operations in Maven.
 */
@Named
@Singleton