*
 * @author Charles Fry
 * @since 10.0
 */
@GwtIncompatible
public abstract class ForwardingCache<K, V> extends ForwardingObject implements Cache<K, V> {

  /** Constructor for use by subclasses. */
  protected ForwardingCache() {}

  @Override
  protected abstract Cache<K, V> delegate();

  /**
   * @since 11.0
   */
  @Override
  public @Nullable V getIfPresent(Object key) {

   *
   * @since 7.0
   */
  protected boolean standardIsEmpty() {
    return !iterator().hasNext();
  }

  /**
   * A sensible definition of {@link #toString} in terms of {@link #iterator}. If you override
   * {@link #iterator}, you may wish to override {@link #toString} to forward to this
   * implementation.
   *
   * @since 7.0
   */
  protected String standardToString() {

   *
   * @since 7.0
   */
  protected boolean standardIsEmpty() {
    return !iterator().hasNext();
  }

  /**
   * A sensible definition of {@link #toString} in terms of {@link #iterator}. If you override
   * {@link #iterator}, you may wish to override {@link #toString} to forward to this
   * implementation.
   *
   * @since 7.0
   */
  protected String standardToString() {

     * @since 3.0-alpha-3
     */
    void setAuthentication(Authentication authentication);

    /**
     * @return repository authentication
     * @since 3.0-alpha-3
     */
    Authentication getAuthentication();

    /**
     * @param proxy proxy
     * @since 3.0-alpha-3
     */
    void setProxy(Proxy proxy);

    /**
     * @since 3.0-alpha-3

   *
   * @since 7.0
   */
  protected Iterator<E> standardIterator() {
    return listIterator();
  }

  /**
   * A sensible default implementation of {@link #listIterator()}, in terms of {@link
   * #listIterator(int)}. If you override {@link #listIterator(int)}, you may wish to override
   * {@link #listIterator()} to forward to this implementation.
   *
   * @since 7.0
   */

 */
@GwtCompatible
public abstract class Ticker {
  /** Constructor for use by subclasses. */
  protected Ticker() {}

  /** Returns the number of nanoseconds elapsed since this ticker's fixed point of reference. */
  public abstract long read();

  /**
   * A ticker that reads the current time using {@link System#nanoTime}.
   *
   * @since 10.0
   */
  public static Ticker systemTicker() {

    public static final String SINCE_ERROR_MESSAGE = "Is not annotated with @since ";
    public static final String SINCE_MISMATCH_ERROR_MESSAGE = "Has invalid @since: it should be %s, but currently is %s";
    public static final String SINCE_INCONSISTENT_ERROR_MESSAGE = "Has inconsistent @since: %s";

    public SinceAnnotationRule(Map<String, Object> params) {
        super(params);
    }

    public void setImplementation(String implementation) {
        this.implementation = implementation;
    }

    public String getSince() {
        return since;
    }

    public void setSince(String since) {
        this.since = since;
    }

    /**
     * Creates a shallow copy of this parameter.
     */
    @Override
    public Parameter clone() {
        try {

  }

  /**
   * @since 13.0
   */
  @Override
  public final void addListener(Listener listener, Executor executor) {
    delegate.addListener(listener, executor);
  }

  /**
   * @since 14.0
   */
  @Override
  public final Throwable failureCause() {
    return delegate.failureCause();
  }

  /**
   * @since 15.0
   */
  @CanIgnoreReturnValue
  @Override

  }

  /**
   * @since 13.0
   */
  @Override
  public final void addListener(Listener listener, Executor executor) {
    delegate.addListener(listener, executor);
  }

  /**
   * @since 14.0
   */
  @Override
  public final Throwable failureCause() {
    return delegate.failureCause();
  }

  /**
   * @since 15.0
   */
  @CanIgnoreReturnValue
  @Override