*
 * <p>This class is not intended as a direct analogue of any existing "option" or "maybe" construct
 * from other programming environments, though it may bear some similarities.
 *
 * <p>An instance of this class is serializable if its reference is absent or is a serializable
 * object.
 *

     */

    /**
     * Establish the transport connection
     *
     * @throws Exception if the connection fails
     */
    protected abstract void doConnect() throws Exception;

    /*
     * Tear down a connection. If the hard parameter is true, the diconnection
     * procedure should not initiate or wait for any outstanding requests on
     * this transport.
     */

    /**

      return -1L
    }
  }

  companion object {
    private val ONLY_HTTP1 = listOf(Protocol.HTTP_1_1)

    /**
     * The maximum number of bytes to enqueue. Rather than enqueueing beyond this limit we tear down
     * the web socket! It's possible that we're writing faster than the peer can read.
     */
    private const val MAX_QUEUE_SIZE = 16L * 1024 * 1024 // 16 MiB.

    /**

            if (logger.isDebugEnabled()) {
                logger.debug("Invalid date format (too short): {}", date);
            }
            return false;
        }
        // Check if it starts with a valid year format
        if (!date.matches("^\\d{4}-\\d{2}-\\d{2}.*")) {
            if (logger.isDebugEnabled()) {
                logger.debug("Invalid date format: {}", date);
            }
            return false;

           * technique previously used by BigIntegerMath: maintain separate numerator and
           * denominator accumulators, multiplying the fraction into result when near overflow.
           */
          for (int i = 2; i <= k; i++, n--) {
            if (numeratorBits + nBits < Long.SIZE - 1) {
              // It's definitely safe to multiply into numerator and denominator.

  /**
   * The reason why this stream was closed, or null if it closed normally or has not yet been
   * closed.
   *
   * If there are multiple reasons to abnormally close this stream (such as both peers closing it
   * near-simultaneously) then this is the first reason known to this peer.
   */
  internal var errorCode: ErrorCode? = null
    get() = withLock { field }

        }

        if (!hasBeenPackagedDuringThisSession(project)) {
            // fallback to loose class files only if artifacts haven't been packaged yet
            // and only for plain old jars. Not war files, not ear files, not anything else.
            return determineBuildOutputDirectoryForArtifact(project, artifact);
        }

        // The fall-through indicates that the artifact cannot be found;

            <option value="$PROJECT_DIR$/platforms/jvm/code-quality" />
            <option value="$PROJECT_DIR$/platforms/jvm/distributions-jvm" />
            <option value="$PROJECT_DIR$/platforms/jvm/ear" />
            <option value="$PROJECT_DIR$/platforms/jvm/jacoco" />
            <option value="$PROJECT_DIR$/platforms/jvm/java-compiler-plugin" />
            <option value="$PROJECT_DIR$/platforms/jvm/java-platform" />

    for (int i = 0; i < elementCount; i++) {
      E element = (E) stream.readObject();
      add(element);
    }
  }

  /*
   * For discussion of the safety of the following methods, see the comments near the end of
   * CompactHashMap.
   */

  private Object requireTable() {
    return requireNonNull(table);
  }

  private int[] requireEntries() {
    return requireNonNull(entries);
  }

		// Examples from https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-glacier-select-sql-reference-date.html#s3-glacier-select-sql-reference-date-diff
		{
			name:       "date_diff_year",
			query:      `SELECT date_diff(year, '2010-01-01T', '2011-01-01T') FROM S3Object LIMIT 1`,
			wantResult: `{"_1":1}`,
		},
		{
			name:       "date_diff_year",
			query:      `SELECT date_diff(month, '2010-01-01T', '2010-05T') FROM S3Object LIMIT 1`,