/**
   * Adds an element to the list, inserting it at the given position. The indeces of elements at and
   * after that position must be updated accordignly.
   *
   * <p>If the index is negative or greater or equal than the size of the list, then an appropriate
   * error must be returned.
   *
   * <p>If a null object is provided to insert in the list, the request must be ignored and an
   * appropriate error must be returned.
   *
   * @param index the position at which the item should be inserted in the list
   * @param item the value to insert into the list
   * @return an ReturnObject, empty if the operation is successful or containing an appropriate
   *     error message otherwise
   */
  public ReturnObject add(int index, Object item) {
    ErrorMessage error1;
    ReturnObject returnobj;

    if (item.equals(null)) {
      error1 = ErrorMessage.INVALID_ARGUMENT;
    } else if (index < 0 || index >= size_list) {
      error1 = ErrorMessage.INDEX_OUT_OF_BOUNDS;
    } else {
      error1 = ErrorMessage.NO_ERROR;
    }

    if (error1.equals(ErrorMessage.NO_ERROR)) {
      Element elem = startElement;

      for (int j = 0; j < index + 1; j++) {
        elem = elem.getNext();
      }
      Element newElement = new Element(item);
      newElement.setNext(elem.getNext());
      elem.setNext(newElement);

      size_list++;
      returnobj = new ReturnObjectImpl(item);
    } else {
      returnobj = new ReturnObjectImpl(error1);
    }

    return returnobj;
  }
 /**
  * Updates the row's inner list elements if the row element already exists or if a new row was
  * added.
  *
  * @param currentRowEle
  * @param elem
  * @param row
  * @param col
  * @param value
  */
 public void updateRowListElements(
     RowColumnElement currentRowEle, Element elem, int row, int col, Object value) {
   Element temp = elem;
   Element currentList = currentRowEle.getList();
   int elemColIdx = elem.columnIndex();
   while (currentList.getNext() != null && currentList.getNext().columnIndex() < elemColIdx) {
     currentList = currentList.getNext();
   }
   if (currentList.getNext() != null && currentList.getNext().columnIndex() == elemColIdx) {
     currentList.getNext().value = elem.value;
     return;
   }
   temp.setNext(currentList.getNext());
   currentList.setNext(temp);
 }
Exemple #3
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 public void push(String value) { // wstaw do kolejki
   if (_first.getValue() == null) _first.setValue(value);
   else {
     Element e = _first;
     while (e.getNext() != null) e = e.getNext();
     e.setNext(new Element(value));
   }
   _size++;
 }
 /**
  * Removes the inner list row elements if the element's value is set to the default value.
  *
  * @param currentRow
  * @param row
  * @param col
  */
 public void removeRowElement(RowColumnElement currentRow, int row, int col) {
   Element rowElementHead = currentRow.getNext().getList();
   while (rowElementHead.getNext() != null) {
     if (rowElementHead.getNext().rowIndex() == row) {
       rowElementHead.setNext(rowElementHead.getNext().getNext());
       break;
     }
     rowElementHead = rowElementHead.getNext();
   }
   removeEmptyRow(currentRow, row);
 }
 public void deleteElement(int number) {
   if (number > getVectorSize() && number < MIN_VECTOR_SIZE)
     throw new VectorIndexOutOfBoundsException();
   Element current = head;
   for (int i = -1; i < number; i++) current = current.getNext();
   if (current == head) {
     head = current.getNext();
     head.setPrev(null);
   } else if (current == tail) {
     tail = current.getPrev();
     tail.setNext(null);
   } else {
     current.getPrev().setNext(current.getNext());
     current.getNext().setPrev(current.getPrev());
   }
 }
Exemple #6
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 public String pop() throws EmptyStackException { // pobierz i wywal
   try {
     if (_size == 0) throw new EmptyStackException();
   } catch (EmptyStackException e) {
     e.komunikat();
   }
   Element e = _first;
   while (e.getNext().getNext() != null) {
     e = e.getNext();
   }
   System.out.println("\nZdjecie ostatniego elementu ze stosu: " + e.getNext().getValue());
   e.setNext(null);
   _size--;
   pokaz();
   return e.getValue();
 }
  /**
   * Adds an element at the end of the list.
   *
   * <p>If a null object is provided to insert in the list, the request must be ignored and an
   * appropriate error must be returned.
   *
   * @param item the value to insert into the list
   * @return an ReturnObject, empty if the operation is successful or containing an appropriate
   *     error message otherwise
   */
  public ReturnObject add(Object item) {
    ReturnObject returnobj;

    if (item.equals(null)) {
      returnobj = new ReturnObjectImpl(ErrorMessage.INVALID_ARGUMENT);
    } else {

      returnobj = new ReturnObjectImpl(item);

      Element elem = startElement;
      for (int j = 0; j < size_list; j++) {
        elem = elem.getNext();
      }
      Element newElement = new Element(item);
      elem.setNext(newElement);
      size_list++;
    }

    return returnobj;
  }
  /**
   * Returns the elements at the given position and removes it from the list. The indeces of
   * elements after the removed element must be updated accordignly.
   *
   * <p>If the index is negative or greater or equal than the size of the list, then an appropriate
   * error must be returned.
   *
   * @param index the position in the list of the item to be retrieved
   * @return the element or an appropriate error message, encapsulated in a ReturnObject
   */
  public ReturnObject remove(int index) {
    ErrorMessage error1 = errortype(index);
    ReturnObject returnobj;

    if (error1.equals(ErrorMessage.NO_ERROR) && size_list > 0) {

      Element elem = startElement;
      // Element elem2=startElement;

      for (int j = 0; j < index + 1; j++) {
        elem = elem.getNext();
      }

      elem.setNext(elem.getNext().getNext());

      returnobj = new ReturnObjectImpl(elem.getNext().returnObject());
      size_list--;

    } else {
      returnobj = new ReturnObjectImpl(error1);
    }

    return returnobj;
  }