core/src/main/java/com/orientechnologies/orient/core/iterator/ORecordIteratorClusters.java
@SuppressWarnings("unchecked")
  @Override
  public REC previous() {
    checkDirection(false);

    if (currentRecord != null)
      try {
        // RETURN LAST LOADED RECORD
        return (REC) currentRecord;
      } finally {
        currentRecord = null;
      }

    ORecord record = getRecord();

    // MOVE BACKWARD IN THE CURRENT CLUSTER
    while (hasPrevious()) {
      if (currentRecord != null)
        try {
          // RETURN LAST LOADED RECORD
          return (REC) currentRecord;
        } finally {
          currentRecord = null;
        }

      record = getTransactionEntry();
      if (record == null)
        record = readCurrentRecord(null, -1);

      if (record != null)
        // FOUND
        if (include(record))
          return (REC) record;
    }

    record = getTransactionEntry();
    if (record != null)
      return (REC) record;

    return null;
  }
@SuppressWarnings("unchecked")
  @Override
  public REC previous() {
    checkDirection(false);

    if (currentRecord != null)
      try {
        // RETURN LAST LOADED RECORD
        return (REC) currentRecord;
      } finally {
        currentRecord = null;
      }

    ORecord record = getRecord();

    // MOVE BACKWARD IN THE CURRENT CLUSTER
    while (hasPrevious()) {
      if (currentRecord != null)
        try {
          // RETURN LAST LOADED RECORD
          return (REC) currentRecord;
        } finally {
          currentRecord = null;
        }

      record = getTransactionEntry();
      if (record == null)
        record = readCurrentRecord(null, -1);

      if (record != null)
        // FOUND
        if (include(record))
          return (REC) record;
    }

    record = getTransactionEntry();
    if (record != null)
      return (REC) record;

    return null;
  }
Return the element at the current position and move backward the cursor to the previous position available.

@return the previous record found, otherwise the NoSuchElementException exception is thrown when no more records are found.