// considered read operations.
func (b *Reader) UnreadByte() error {
	if b.lastByte < 0 || b.r == 0 && b.w > 0 {
		return ErrInvalidUnreadByte
	}
	// b.r > 0 || b.w == 0
	if b.r > 0 {
		b.r--
	} else {
		// b.r == 0 && b.w == 0
		b.w = 1
	}
	b.buf[b.r] = byte(b.lastByte)
	b.lastByte = -1
	b.lastRuneSize = -1
	return nil
}

    checkPositionIndexes(fromIndex, toIndex, size());
    int length = toIndex - fromIndex;
    if (length == size()) {
      return this;
    } else if (length == 0) {
      return of();
    } else if (length == 1) {
      return of(get(fromIndex));
    } else {
      return subListUnchecked(fromIndex, toIndex);
    }
  }

  /**

      boolean executeImmediate = false;

      synchronized (runnables) {
        if (!executed) {
          runnables.add(new RunnableExecutorPair(runnable, executor));
        } else {
          executeImmediate = true;
        }
      }

      if (executeImmediate) {
        new RunnableExecutorPair(runnable, executor).execute();
      }
    }

    public void execute() {

	key := vars["key"]

	var subSys, target string
	{
		ws := strings.SplitN(key, madmin.SubSystemSeparator, 2)
		subSys = ws[0]
		if len(ws) == 2 {
			if ws[1] == "" {
				target = madmin.Default
			} else {
				target = ws[1]
			}
		}
	}

	subSysConfigs, err := cfg.GetSubsysInfo(subSys, target, true)
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

        RandomHasherAction.pickAtRandom(random).performAction(random, sinksAndControl);
      }
      // We need to ensure that at least 4 bytes have been put into the hasher or else
      // Hasher#hash will throw an ISE.
      int intToPut = random.nextInt();
      for (Hasher hasher : sinksAndControl) {
        hasher.putInt(intToPut);
      }
      for (Sink sink : sinks) {

                        if (!pending.isEmpty()) {
                            predecessors.put(key, pending);
                            pending = new ArrayList<>();
                        }
                    } else {
                        pending.add(element);
                    }
                }

                List<Plugin> result = new ArrayList<>(src.size() + tgt.size());

			errCode := doesPresignV2SignatureMatch(req)
			if errCode != testCase.expected {
				t.Errorf("(%d) expected to get %s, instead got %s", i, niceError(testCase.expected), niceError(errCode))
			}
		} else {
			err = preSignV2(req, accessKey, secretKey, now.Unix()+60)
			if err != nil {
				t.Fatalf("(%d) failed to preSignV2 http request, got %v", i, err)
			}
			// Should be set since we are simulating a http server.

		}
	}()

	context.AfterFunc(s.ctx, func() {
		if err := s.cniListenServer.Close(); err != nil {
			log.Errorf("CNI listen server terminated with error: %v", err)
		} else {
			log.Debug("CNI listen server terminated")
		}
	})
	return nil
}

func (s *CniPluginServer) handleAddEvent(w http.ResponseWriter, req *http.Request) {
	if req.Body == nil {

    if (element == null) {
      while (iterator.hasNext()) {
        if (iterator.next() == null) {
          return true;
        }
      }
    } else {
      while (iterator.hasNext()) {
        if (element.equals(iterator.next())) {
          return true;
        }
      }
    }
    return false;
  }

  /**

 Optional supplemental description.
```
+ Make sure you have added the necessary tests (JUnit/[Core IT tests][core-it]) for your changes.
+ Run all the tests with `mvn -Prun-its verify` to assure nothing else was accidentally broken.
+ Submit a pull request to the repository in the Apache organization.
+ Update your JIRA ticket and include a link to the pull request in the ticket.