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GeezerVison is showing github.com — Java/DataStructures/Lists/CursorLinkedList.java at master · xhui28/Java

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CursorLinkedList.java

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package DataStructures.Lists;
import java.util.Objects;
public class CursorLinkedList<T> {
private static class Node<T> {
T element;
int next;
Node(T element, int next) {
this.element = element;
this.next = next;
}
boolean isEmpty() {
return element == null;
}
}
private final int os;
private int head;
private final Node<T>[] cursorSpace;
private int count;
private final static int CURSOR_SPACE_SIZE = 100;
{
// init at loading time
cursorSpace = new Node[CURSOR_SPACE_SIZE];
for (int i = 0; i < CURSOR_SPACE_SIZE; i++) {
cursorSpace[i] = new Node<>(null, i + 1);
}
cursorSpace[CURSOR_SPACE_SIZE - 1].next = 0;
}
public CursorLinkedList() {
os = 0;
count = 0;
head = -1;
}
public void printList() {
if (head != -1) {
int start = head;
while (start != -1) {
T element = cursorSpace[start].element;
System.out.println(element.toString());
start = cursorSpace[start].next;
}
}
}
/**
* @return the logical index of the element within the list , not the actual
* index of the [cursorSpace] array
*/
public int indexOf(T element) {
Objects.requireNonNull(element);
Node<T> iterator = cursorSpace[head];
for (int i = 0; i < count; i++) {
if (iterator.element.equals(element)) {
return i;
}
iterator = cursorSpace[iterator.next];
}
return -1;
}
/**
* @param position , the logical index of the element , not the actual one
* within the [cursorSpace] array .
* this method should be used to get the index give by indexOf() method.
* @return
*/
public T get(int position) {
if (position >= 0 && position < count) {
int start = head;
int counter = 0;
while (start != -1) {
T element = cursorSpace[start].element;
if (counter == position) {
return element;
}
start = cursorSpace[start].next;
counter++;
}
}
return null;
}
public void removeByIndex(int index) {
if (index >= 0 && index < count) {
T element = get(index);
remove(element);
}
}
public void remove(T element) {
Objects.requireNonNull(element);
// case element is in the head
T temp_element = cursorSpace[head].element;
int temp_next = cursorSpace[head].next;
if (temp_element.equals(element)) {
free(head);
head = temp_next;
} else { // otherwise cases
int prev_index = head;
int current_index = cursorSpace[prev_index].next;
while (current_index != -1) {
T current_element = cursorSpace[current_index].element;
if (current_element.equals(element)) {
cursorSpace[prev_index].next = cursorSpace[current_index].next;
free(current_index);
break;
}
prev_index = current_index;
current_index = cursorSpace[prev_index].next;
}
}
count--;
}
private void free(int index) {
Node os_node = cursorSpace[os];
int os_next = os_node.next;
cursorSpace[os].next = index;
cursorSpace[index].element = null;
cursorSpace[index].next = os_next;
}
public void append(T element) {
Objects.requireNonNull(element);
int availableIndex = alloc();
cursorSpace[availableIndex].element = element;
if (head == -1) {
head = availableIndex;
}
int iterator = head;
while (cursorSpace[iterator].next != -1) {
iterator = cursorSpace[iterator].next;
}
cursorSpace[iterator].next = availableIndex;
cursorSpace[availableIndex].next = -1;
count++;
}
/**
* @return the index of the next available node
*/
private int alloc() {
//1- get the index at which the os is pointing
int availableNodeIndex = cursorSpace[os].next;
if (availableNodeIndex == 0) {
throw new OutOfMemoryError();
}
//2- make the os point to the next of the @var{availableNodeIndex}
int availableNext = cursorSpace[availableNodeIndex].next;
cursorSpace[os].next = availableNext;
// this to indicate an end of the list , helpful at testing since any err
// would throw an outOfBoundException
cursorSpace[availableNodeIndex].next = -1;
return availableNodeIndex;
}
}
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