unknown = true;
                }
                if (selected == null) {
                    selected = type;
                } else if (unknown) {
                    // More than one filtered value, and we don't know how to handle at least one of them.
                    // TODO: add a plugin mechanism for allowing plugin to specify their selection algorithm.
                    return Optional.empty();

                    .relocation(model.getDistributionManagement().getRelocation())
                    .build());
        }
        // only keep repositories other than 'central'
        builder.pluginRepositories(pruneRepositories(model.getPluginRepositories()));
        builder.repositories(pruneRepositories(model.getRepositories()));
        return builder;
    }

        if (managedOriginatingArtifact != null) {
            // TODO we probably want to warn the user that he is building an artifact with
            // different values than in dependencyManagement
            if (managedVersions instanceof ManagedVersionMap) {
                /* avoid modifying the managedVersions parameter creating a new map */

            configuration). This is useful when you want to force the user to use common POM elements rather than
            plugin configurations, as in the case where you want to use the artifact's final name as a parameter. In
            this case, you want the user to modify {@code <build><finalName/></build>} rather
            than specifying a value for finalName directly in the plugin configuration section. It is also useful to

        ArtifactVersion matched = null;
        for (ArtifactVersion version : versions) {
            if (containsVersion(version)) {
                // valid - check if it is greater than the currently matched version
                if (matched == null || version.compareTo(matched) > 0) {
                    matched = version;
                }
            }
        }
        return matched;

public interface ProfileInjector {

    /**
     * Merges values from the specified profile into the given model. Implementations are expected to keep the profile
     * and model completely decoupled by injecting deep copies rather than the original objects from the profile.
     *
     * @param model The model into which to merge the values defined by the profile, must not be <code>null</code>.

            // all the tasks, then the thread will block waiting for all
            // those subtasks to finish.
            // This ensures the number of running workers is no more than
            // the defined parallism, while making sure the pool will not
            // be exhausted
            //
            return new ThreadPoolExecutor(

     * configuration). This is useful when you want to force the user to use common POM elements rather than plugin
     * configurations, as in the case where you want to use the artifact's final name as a parameter. In this case, you
     * want the user to modify <code>&lt;build&gt;&lt;finalName/&gt;&lt;/build&gt;</code> rather than specifying a value

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.eventspy;

/**
 * A skeleton eventspy that does nothing other than helping implementors.
 * @since 3.0.2
 */
public abstract class AbstractEventSpy implements EventSpy {

    public void init(Context context) throws Exception {}

  anticipate the inevitable network failures that accompany being physically
  disconnected from the network, and adjust it's behavior accordingly.

  It is more than simply understanding that m2 cannot go and check for the
  latest version of some snapshot artifact. If m2 is offline, SCM operations
  cannot succeed; no artifact downloads can take place, regardless of whether