*
 * @author Mike Bostock
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible
public final class Functions {
  private Functions() {}

  /**
   * A function equivalent to the method reference {@code Object::toString}. The function simply
   * invokes {@code toString} on its argument and returns the result. It throws a {@link
   * NullPointerException} on null input.
   *

        ComparableVersion c1 = new ComparableVersion("1");
        c1.parseVersion("2");

        Comparable<?> c2 = newComparable("2");

        assertEquals(c1, c2, "reused instance should be equivalent to new instance");
    }

    /**
     * Test <a href="https://issues.apache.org/jira/browse/MNG-7644">MNG-7644</a> edge cases
     * 1.0.0.RC1 &lt; 1.0.0-RC2 and more generally:

   * remaining 32 bits interpreted as an IPv4 address. These are conventionally represented in
   * string literals as {@code "::192.168.0.1"}, though {@code "::c0a8:1"} is also considered an
   * IPv4 compatible address (and equivalent to {@code "::192.168.0.1"}).
   *
   * <p>For more on IPv4 compatible addresses see section 2.5.5.1 of <a target="_parent"
   * href="http://tools.ietf.org/html/rfc4291#section-2.5.5.1">RFC 4291</a>.
   *

    }
    if (refreshTimeUnit != null) {
      builder.refreshAfterWrite(refreshDuration, refreshTimeUnit);
    }

    return builder;
  }

  /**
   * Returns a string that can be used to parse an equivalent {@code CacheBuilderSpec}. The order
   * and form of this representation is not guaranteed, except that reparsing its output will
   * produce a {@code CacheBuilderSpec} equal to this instance.
   */

    }
    if (refreshTimeUnit != null) {
      builder.refreshAfterWrite(refreshDuration, refreshTimeUnit);
    }

    return builder;
  }

  /**
   * Returns a string that can be used to parse an equivalent {@code CacheBuilderSpec}. The order
   * and form of this representation is not guaranteed, except that reparsing its output will
   * produce a {@code CacheBuilderSpec} equal to this instance.
   */

## Acronyms

- **AEAD**: Authenticated Encryption with Associated Data
- **CSPRNG**: Cryptographically Secure Pseudo Random Number Generator
- **EK**: External Key

     * or
     * proto:server[key1=val1,key2=val2]
     * or
     * proto:[key1=val1,key2=val2]
     *
     * If a key is absent it is assumed to be 'endpoint'. Thus the
     * following are equivalent:
     * proto:\\ts0.win.net[endpoint=\pipe\srvsvc]
     * proto:ts0.win.net[\pipe\srvsvc]
     *
     * If the server is absent it is set to "127.0.0.1"
     */
    /**

 *
 * @author Mike Bostock
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible
public final class Functions {
  private Functions() {}

  /**
   * A function equivalent to the method reference {@code Object::toString}. The function simply
   * invokes {@code toString} on its argument and returns the result. It throws a {@link
   * NullPointerException} on null input.
   *

/**
 * Manages a dictionary file for synonyms.
 * This class handles reading, parsing, and updating files that contain
 * synonym rules. The file format supports both explicit mappings (e.g., `a => b`)
 * and equivalent synonyms (e.g., `a, b, c`).
 *
 * The class provides methods for retrieving, adding, updating, and
 * deleting synonym items, as well as reloading the dictionary
 * from its source file.
 */

 * degrades more gracefully for worst-case input.
 *
 * <p>The implementation does not necessarily use a <i>stable</i> sorting algorithm; when multiple
 * equivalent elements are added to it, it is undefined which will come first in the output.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
final class TopKSelector<
    T extends @Nullable Object> {

  /**