TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer(new StreamSource(stylesheet));

        System.out.format("=> transformer %s (%s)%n", transformer, transformer.getClass().getName());

        if (destDir.length() > 0) {
            transformer.setParameter("base.dir", destDir + "/");
        }

            Transformer transformer = factory.newTransformer()
            if (indent) {
                transformer.setOutputProperty(OutputKeys.INDENT, "yes")
            }
            transformer.setOutputProperty(OutputKeys.METHOD, "xml")
            transformer.setOutputProperty(OutputKeys.MEDIA_TYPE, "text/xml")
            transformer.transform(new DOMSource(root), new StreamResult(stream))
        }

     *       v2)} implies that {@code Objects.equals(transformer.transform(k1, v1),
     *       transformer.transform(k2, v2))}.
     * </ul>
     *
     * @throws NullPointerException if the key or value is null and this transformer does not accept
     *     null arguments
     */
    @ParametricNullness

     *       v2)} implies that {@code Objects.equals(transformer.transform(k1, v1),
     *       transformer.transform(k2, v2))}.
     * </ul>
     *
     * @throws NullPointerException if the key or value is null and this transformer does not accept
     *     null arguments
     */
    @ParametricNullness

import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.util.ComponentUtil;

import jakarta.annotation.PostConstruct;

/**
 * Standard transformer implementation for the Fess search engine.
 * This transformer handles document transformation and content extraction using
 * the standard Fess file transformation process with support for various content types.
 *

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.deployment.DeployRequest;
import org.eclipse.aether.installation.InstallRequest;

/**
 * Maven POM transformer.
 * TODO: rename this interface to "Transformer" as it can do much more than just transform POM.
 * @since TBD
 */
public interface PomArtifactTransformer {
    InstallRequest remapInstallArtifacts(RepositorySystemSession session, InstallRequest request);

        }
    }

    static class ExtensionInterpolator extends MavenTransformer {
        ExtensionInterpolator(UnaryOperator<String> transformer) {
            super(transformer);
        }

        public XmlNode transform(XmlNode node) {
            return super.transform(node);
        }
    }

    }

    @Test
    public void test_metaContentMapping() {
        transformer.metaContentMapping = new HashMap<>();
        transformer.metaContentMapping.put("author", "dc:creator");
        transformer.metaContentMapping.put("title", "dc:title");

        assertEquals(2, transformer.metaContentMapping.size());
        assertEquals("dc:creator", transformer.metaContentMapping.get("author"));

    final EntryTransformer<? super K, ? super V1, V2> transformer;

    TransformedEntriesMultimap(
        Multimap<K, V1> fromMultimap, EntryTransformer<? super K, ? super V1, V2> transformer) {
      this.fromMultimap = checkNotNull(fromMultimap);
      this.transformer = checkNotNull(transformer);
    }

    Collection<V2> transform(@ParametricNullness K key, Collection<V1> values) {

    final EntryTransformer<? super K, ? super V1, V2> transformer;

    TransformedEntriesMultimap(
        Multimap<K, V1> fromMultimap, EntryTransformer<? super K, ? super V1, V2> transformer) {
      this.fromMultimap = checkNotNull(fromMultimap);
      this.transformer = checkNotNull(transformer);
    }

    Collection<V2> transform(@ParametricNullness K key, Collection<V1> values) {