PostingListNode.java

public class PostingListNode<T> {

    public T data;
    public PostingListNode<T> next;
    public PostingListNode<T> jump;

    public PostingListNode(T data) {
        this.data = data;
    }

    public PostingListNode(T data, PostingListNode<T> next) {
        this.data = data;
        this.next = next;
    }

    public PostingListNode(T data, PostingListNode<T> next, PostingListNode<T> jump) {
        this.data = data;
        this.next = next;
        this.jump = jump;
    }

    public PostingListNode<T> get(int n) {
        if (n == 0) {
            return this;
        } else if (n < 0) {
            return null;
        } else if (this.next == null){
            throw new RuntimeException("Index out of bounds.");
        } else {
            return this.next.get(--n);
        }
    }
}