public ClassRealm getClassRealm() {
        return realm;
    }

    /**
     * Returns artifacts exported by the extension, identified by groupId:artifactId string key.
     */
    public Set<String> getExportedArtifacts() {
        return artifacts;
    }

    /**
     * Returns classpath elements exported by the extension.
     */
    public Set<String> getExportedPackages() {
        return packages;
    }

          <description><![CDATA[Restricts the classes/resources from the current artifact's CoreExtension class realm that are exposed. Values ending with ".*" expose all classes/resources which are directly contained in the given package in binary form. 
            Other values define only the prefix of classes/resources being exposed. Their binary name must be equal to the prefix or starting with the prefix (followed by "." or "$").

        this.artifacts = null;
        this.artifactMap = null;
    }

    /**
     * Sets the scope filter to select the artifacts being exposed to the currently executed mojo.
     * <strong>Warning:</strong> This is an internal utility method that is only public for technical reasons, it is not

public interface ArtifactFilterManager {
    /**
     * Returns a filter for core + extension artifacts.
     *
     * @return the artifact filter
     * @deprecated use {@code META-INF/maven/extension.xml} to define artifacts exported by Maven core and plugin
     *             extensions.
     */
    ArtifactFilter getArtifactFilter();

    /**
     * Returns a filter for only the core artifacts.
     *
     * @return the artifact filter

    // this is a live injected collection
    private final List<ClassRealmManagerDelegate> delegates;

    private final ClassRealm mavenApiRealm;

    /**
     * Patterns of artifacts provided by maven core and exported via maven api realm. These artifacts are filtered from
     * plugin and build extensions realms to avoid presence of duplicate and possibly conflicting classes on classpath.
     */
    private final Set<String> providedArtifacts;

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

import java.util.Set;

/**
 * @deprecated use {@code META-INF/maven/extension.xml} to define artifacts exported by Maven core extensions.
 */
@Deprecated
public interface ArtifactFilterManagerDelegate {

    void addExcludes(Set<String> excludes);

    void addCoreExcludes(Set<String> excludes);

    <exportedPackage>org.fusesource.jansi.Ansi</exportedPackage>

    <!-- javax.inject (JSR-330) -->
    <exportedPackage>javax.inject.*</exportedPackage>
    <!-- javax.enterprise.inject (JSR-299): Must never be exported if needed at plugin level, plugin adds it
         there is no justification to get it at Maven level and leaking it will conflict.
    <exportedPackage>javax.enterprise.util.*</exportedPackage>

                if (exports == null || exports.isEmpty()) {
                    /*
                     * Most existing extensions don't define exported packages, i.e. no classes are to be exposed to
                     * plugins, yet the components provided by the extension (e.g. artifact handlers) must be

                            if (!downloaded) {
                                // prevent additional checks of this artifact until it expires again
                                destination.setLastModified(System.currentTimeMillis());
                            }
                        } catch (UnsupportedOperationException e) {