* Gets unique identifier of the model
     *
     * @return The effective identifier of the model, never {@code null}.
     */
    public String id() {
        // if source is null, it is the super model, which can be accessed via empty string
        return source != null ? source.getLocation() : "";
    }

    @Override
    public String toString() {
        return String.valueOf(model);
    }

  unimplemented, which is to detect when the network is down and provide better
  feedback for that case. However, when offline mode is declared, nothing
  earmarked as remote should be accessed, regardless of whether it is actually
  a physically local resource.

  NOTE: One side-effect of this design change is that all offline-mode code can
  be isolated to maven-core, maven-plugin-descriptor, and [possibly]

         * starting at the root object contained in this value source, apply each part
         * to the object graph below this root, using either 'getXXX()' or 'isXXX()'
         * accessor types to resolve the value for each successive expression part.
         * Finally, return the result of the last expression part's resolution.</p>
         *

    /**
     * Gets the session to use for repository access.
     *
     * @return The repository session or {@code null} if not set.
     */
    RepositorySystemSession getRepositorySession();

    /**
     * Sets the session to use for repository access.
     *
     * @param repositorySession The repository session to use.

 * under the License.
 */
package org.apache.maven.api.services;

import org.apache.maven.api.Type;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Access to {@link Type} registry.
 *
 * @since 4.0.0
 */
@Experimental
public interface TypeRegistry extends ExtensibleEnumRegistry<Type> {

    /**
     * Obtain the {@link Type} from the specified {@code id}.

import java.util.Calendar;
import java.util.Date;

/**
 * Describes a set of policies for a repository to use under certain conditions.
 *
 * @deprecated Avoid use of this type, if you need access to local repository use repository system session instead.
 */
@Deprecated
public class ArtifactRepositoryPolicy {
    public static final String UPDATE_POLICY_NEVER = "never";

                    String msg = str + " aggregator mojo is already being executed "
                            + "in this parallel build, those kind of mojos require exclusive access to "
                            + "reactor to prevent race conditions. This mojo execution will be blocked "
                            + "until the aggregator mojo is done.";
                    warn(msg);

 *                                             <td>{@link MavenSession#getLocalRepository()} DEPRECATED: Avoid use of {@link org.apache.maven.artifact.repository.ArtifactRepository} type. If you need access to local repository, switch to '${repositorySystemSession}' expression and get LRM from it instead. See <a href="https://issues.apache.org/jira/browse/MNG-7706">MNG-7706</a></td></tr>

import org.apache.maven.api.settings.Settings;

/**
 * The session to install / deploy / resolve artifacts and dependencies.
 *
 * TODO: move the remote repositories in the requests (plugins will need to access this list somehow)
 * TODO: add request trace so that requests can be linked together and through the resolver
 * TODO: add a Request interface holding session + parent request
 *
 * @since 4.0.0
 */
@Experimental

    /**
     * Gets the session to use for repository access.
     *
     * @return The repository session or {@code null} if not set.
     */
    RepositorySystemSession getRepositorySession();

    /**
     * Sets the session to use for repository access.
     *
     * @param repositorySession The repository session to use.