* that callers don't pass an {@link Entry} by mistake.
   */
  protected V get(K key) {
    return getMap().get(key);
  }

  protected final K k0() {
    return e0().getKey();
  }

  protected final V v0() {
    return e0().getValue();
  }

  protected final K k1() {
    return e1().getKey();
  }

  protected final V v1() {
    return e1().getValue();
  }

    extends AbstractContainerTester<Collection<E>, E> {

  // TODO: replace this with an accessor.
  protected Collection<E> collection;

  @Override
  protected Collection<E> actualContents() {
    return collection;
  }

  // TODO: dispose of this once collection is encapsulated.
  @Override
  @CanIgnoreReturnValue
  protected Collection<E> resetContainer(Collection<E> newContents) {
    collection = super.resetContainer(newContents);

    protected final PluginValidationManager pluginValidationManager;

    protected AbstractMavenPluginParametersValidator(PluginValidationManager pluginValidationManager) {
        this.pluginValidationManager = requireNonNull(pluginValidationManager);
    }

    protected boolean isValueSet(PlexusConfiguration config, ExpressionEvaluator expressionEvaluator) {

  public static class ImmutableListOfGenerator extends TestStringListGenerator {
    @Override
    protected List<String> create(String[] elements) {
      return ImmutableList.copyOf(elements);
    }
  }

  public static class BuilderAddListGenerator extends TestStringListGenerator {
    @Override
    protected List<String> create(String[] elements) {
      ImmutableList.Builder<String> builder = ImmutableList.builder();

        throw new IllegalStateException("This transformer does not use this call.");
    }

    protected static final String NAMESPACE_FORMAT = "http://maven.apache.org/POM/%s";

    protected static final String SCHEMA_LOCATION_FORMAT = "https://maven.apache.org/xsd/maven-%s.xsd";

    protected Model read(Path src) throws IOException, XMLStreamException {
        try (InputStream is = Files.newInputStream(src)) {

import java.io.Serializable;

import static java.util.Objects.requireNonNull;

public abstract class BaseObject implements Serializable, Cloneable {
    protected transient ChildrenTracking childrenTracking;

    protected Object delegate;

    public BaseObject() {}

    public BaseObject(Object delegate, BaseObject parent) {
        this.delegate = requireNonNull(delegate, "delegate cannot be null");

 */
@Deprecated
public abstract class AbstractVersionTransformation extends AbstractLogEnabled implements ArtifactTransformation {
    @Inject
    protected RepositoryMetadataManager repositoryMetadataManager;

    @Inject
    protected WagonManager wagonManager;

    @Override
    public void transformForResolve(

    UnicodeEscaper escaper =
        new ArrayBasedUnicodeEscaper(
            SIMPLE_REPLACEMENTS, Character.MIN_VALUE, Character.MAX_CODE_POINT, null) {
          @Override
          protected char[] escapeUnsafe(int c) {
            return NO_CHARS;
          }
        };
    EscaperAsserts.assertBasic(escaper);
    assertThat(escaper.escape("\tFish & Chips\n")).isEqualTo("<tab>Fish <and> Chips<newline>");

/**
 * Options that are "layered" by precedence order.
 *
 * @param <O> The type of options.
 */
public abstract class LayeredOptions<O extends Options> implements Options {
    protected final List<O> options;

    protected LayeredOptions(List<O> options) {
        this.options = new ArrayList<>(options);
    }

    @Override
    public Optional<Map<String, String>> userProperties() {

        return record;
    }

    @Override
    public void flush() {
        cache.clear();
    }

    protected static int pluginHashCode(Plugin plugin) {
        return CacheUtils.pluginHashCode(plugin);
    }

    protected static boolean pluginEquals(Plugin a, Plugin b) {
        return CacheUtils.pluginEquals(a, b);
    }

    @Override