1071 lines
27 KiB
Java
1071 lines
27 KiB
Java
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package com.jwetherell.algorithms.data_structures;
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import java.util.Arrays;
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import com.jwetherell.algorithms.data_structures.interfaces.IList;
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@SuppressWarnings("unchecked")
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public abstract class List<T> implements IList<T> {
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/**
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* A dynamic array, growable array, resizable array, dynamic table, or array
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* list is a random access, variable-size list data structure that allows
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* elements to be added or removed.
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*
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* http://en.wikipedia.org/wiki/Dynamic_array
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*
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* @author Justin Wetherell <phishman3579@gmail.com>
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*/
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public static class ArrayList<T> extends List<T> {
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private static final int MINIMUM_SIZE = 1024;
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private int size = 0;
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private T[] array = (T[]) new Object[MINIMUM_SIZE];
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean add(T value) {
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return add(size,value);
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}
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/**
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* Add value to list at index.
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*
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* @param index to add value.
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* @param value to add to list.
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*/
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public boolean add(int index, T value) {
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if (size >= array.length)
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grow();
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if (index==size) {
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array[size] = value;
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} else {
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// Shift the array down one spot
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System.arraycopy(array, index, array, index+1, size - index);
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array[index] = value;
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}
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size++;
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean remove(T value) {
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for (int i = 0; i < size; i++) {
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T obj = array[i];
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if (obj.equals(value)) {
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if (remove(i)!=null) return true;
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return false;
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}
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}
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return false;
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}
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/**
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* Remove value at index from list.
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*
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* @param index of value to remove.
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* @return value at index.
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*/
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public T remove(int index) {
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if (index<0 || index>=size) return null;
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T t = array[index];
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if (index != --size) {
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// Shift the array down one spot
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System.arraycopy(array, index + 1, array, index, size - index);
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}
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array[size] = null;
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int shrinkSize = array.length>>1;
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if (shrinkSize >= MINIMUM_SIZE && size < shrinkSize)
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shrink();
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return t;
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}
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// Grow the array by 50%
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private void grow() {
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int growSize = size + (size<<1);
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array = Arrays.copyOf(array, growSize);
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}
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// Shrink the array by 50%
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private void shrink() {
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int shrinkSize = array.length>>1;
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array = Arrays.copyOf(array, shrinkSize);
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}
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/**
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* Set value at index.
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*
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* @param index of value to set.
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* @param value to set.
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* @return value previously at index.
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*/
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public T set(int index, T value) {
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if (index<0 || index>=size) return null;
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T t = array[index];
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array[index] = value;
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return t;
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}
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/**
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* Get value at index.
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*
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* @param index of value to get.
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* @return value at index.
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*/
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public T get(int index) {
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if (index<0 || index>=size) return null;
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return array[index];
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void clear() {
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size = 0;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean contains(T value) {
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for (int i = 0; i < size; i++) {
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T obj = array[i];
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if (obj.equals(value)) return true;
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}
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int size() {
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return size;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean validate() {
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int localSize = 0;
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for (int i=0; i<array.length; i++) {
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T t = array[i];
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if (i<size) {
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if (t==null) return false;
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localSize++;
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} else {
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if (t!=null) return false;
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}
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}
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return (localSize==size);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public java.util.List<T> toList() {
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return (new JavaCompatibleArrayList<T>(this));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public java.util.Collection<T> toCollection() {
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return (new JavaCompatibleArrayList<T>(this));
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public String toString() {
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StringBuilder builder = new StringBuilder();
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for (int i = 0; i < size; i++) {
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builder.append(array[i]).append(", ");
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}
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return builder.toString();
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}
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}
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public static class JavaCompatibleArrayList<T> extends java.util.AbstractList<T> implements java.util.RandomAccess {
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private List.ArrayList<T> list = null;
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public JavaCompatibleArrayList(List.ArrayList<T> list) {
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this.list = list;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean add(T value) {
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return list.add(value);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean remove(Object value) {
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return list.remove((T)value);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean contains(Object value) {
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return list.contains((T)value);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int size() {
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return list.size;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void add(int index, T value) {
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list.add(index, value);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public T remove(int index) {
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return list.remove(index);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public T get(int index) {
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T t = list.get(index);
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if (t!=null)
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return t;
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throw new IndexOutOfBoundsException();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public T set(int index, T value) {
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return list.set(index, value);
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}
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}
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/**
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* Linked List (Singly link). A linked list is a data structure consisting
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* of a group of nodes which together represent a sequence.
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*
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* http://en.wikipedia.org/wiki/Linked_list
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*
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* @author Justin Wetherell <phishman3579@gmail.com>
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*/
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public static class SinglyLinkedList<T> extends List<T> {
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private int size = 0;
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private Node<T> head = null;
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private Node<T> tail = null;
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean add(T value) {
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return add(new Node<T>(value));
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}
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/**
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* Add node to list.
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*
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* @param node
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* to add to list.
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*/
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private boolean add(Node<T> node) {
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if (head == null) {
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head = node;
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tail = node;
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} else {
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Node<T> prev = tail;
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prev.next = node;
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tail = node;
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}
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size++;
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean remove(T value) {
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// Find the node
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Node<T> prev = null;
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Node<T> node = head;
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while (node != null && (!node.value.equals(value))) {
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prev = node;
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node = node.next;
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}
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if (node == null)
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return false;
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// Update the tail, if needed
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if (node.equals(tail)) {
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tail = prev;
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if (prev != null)
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prev.next = null;
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}
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Node<T> next = node.next;
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if (prev != null && next != null) {
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prev.next = next;
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} else if (prev != null && next == null) {
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prev.next = null;
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} else if (prev == null && next != null) {
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// Node is the head
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head = next;
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} else {
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// prev==null && next==null
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head = null;
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}
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size--;
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void clear() {
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head = null;
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size = 0;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean contains(T value) {
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Node<T> node = head;
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while (node != null) {
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if (node.value.equals(value))
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return true;
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node = node.next;
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}
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int size() {
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return size;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean validate() {
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java.util.Set<T> keys = new java.util.HashSet<T>();
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Node<T> node = head;
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if (node != null) {
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keys.add(node.value);
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Node<T> child = node.next;
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while (child != null) {
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if (!validate(child,keys))
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return false;
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child = child.next;
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}
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}
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return (keys.size()==size);
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}
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private boolean validate(Node<T> node, java.util.Set<T> keys) {
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if (node.value==null)
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return false;
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keys.add(node.value);
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Node<T> child = node.next;
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if (child==null) {
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if (!node.equals(tail))
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return false;
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}
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return true;
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}
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/**
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* {@inheritDoc}
|
||
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*/
|
||
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@Override
|
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public java.util.List<T> toList() {
|
||
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return (new JavaCompatibleSinglyLinkedList<T>(this));
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||
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}
|
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|
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/**
|
||
|
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* {@inheritDoc}
|
||
|
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*/
|
||
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@Override
|
||
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public java.util.Collection<T> toCollection() {
|
||
|
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return (new JavaCompatibleSinglyLinkedList<T>(this));
|
||
|
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}
|
||
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|
||
|
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/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public String toString() {
|
||
|
|
StringBuilder builder = new StringBuilder();
|
||
|
|
Node<T> node = head;
|
||
|
|
while (node != null) {
|
||
|
|
builder.append(node.value).append(", ");
|
||
|
|
node = node.next;
|
||
|
|
}
|
||
|
|
return builder.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
private static class Node<T> {
|
||
|
|
|
||
|
|
private T value = null;
|
||
|
|
private Node<T> next = null;
|
||
|
|
|
||
|
|
private Node() { }
|
||
|
|
|
||
|
|
private Node(T value) {
|
||
|
|
this.value = value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public String toString() {
|
||
|
|
return "value=" + value + " next=" + ((next != null) ? next.value : "NULL");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Linked List (singly link). A linked list is a data structure consisting
|
||
|
|
* of a group of nodes which together represent a sequence.
|
||
|
|
*
|
||
|
|
* http://en.wikipedia.org/wiki/Linked_list
|
||
|
|
*
|
||
|
|
* @author Justin Wetherell <phishman3579@gmail.com>
|
||
|
|
*/
|
||
|
|
public static class JavaCompatibleSinglyLinkedList<T> extends java.util.AbstractSequentialList<T> {
|
||
|
|
|
||
|
|
private List.SinglyLinkedList<T> list = null;
|
||
|
|
|
||
|
|
public JavaCompatibleSinglyLinkedList(List.SinglyLinkedList<T> list) {
|
||
|
|
this.list = list;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean add(T value) {
|
||
|
|
return list.add(value);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean remove(Object value) {
|
||
|
|
return list.remove((T)value);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean contains(Object value) {
|
||
|
|
return list.contains((T)value);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public int size() {
|
||
|
|
return list.size();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public java.util.ListIterator<T> listIterator(int index) {
|
||
|
|
return (new SinglyLinkedListListIterator<T>(list));
|
||
|
|
}
|
||
|
|
|
||
|
|
private static class SinglyLinkedListListIterator<T> implements java.util.ListIterator<T> {
|
||
|
|
|
||
|
|
private int index = 0;
|
||
|
|
|
||
|
|
private SinglyLinkedList<T> list = null;
|
||
|
|
private SinglyLinkedList.Node<T> prev = null;
|
||
|
|
private SinglyLinkedList.Node<T> next = null;
|
||
|
|
private SinglyLinkedList.Node<T> last = null;
|
||
|
|
|
||
|
|
private SinglyLinkedListListIterator(SinglyLinkedList<T> list) {
|
||
|
|
this.list = list;
|
||
|
|
this.next = list.head;
|
||
|
|
this.prev = null;
|
||
|
|
this.last = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public void add(T value) {
|
||
|
|
SinglyLinkedList.Node<T> node = new SinglyLinkedList.Node<T>(value);
|
||
|
|
|
||
|
|
if (list.head == null) {
|
||
|
|
list.head = node;
|
||
|
|
list.tail = node;
|
||
|
|
} else {
|
||
|
|
SinglyLinkedList.Node<T> p = null;
|
||
|
|
SinglyLinkedList.Node<T> n = list.head;
|
||
|
|
while (n!= null && !(n.equals(next))) {
|
||
|
|
p = node;
|
||
|
|
n = node.next;
|
||
|
|
}
|
||
|
|
if (p != null) {
|
||
|
|
p.next = node;
|
||
|
|
} else {
|
||
|
|
// replacing head
|
||
|
|
list.head = node;
|
||
|
|
}
|
||
|
|
node.next = n;
|
||
|
|
}
|
||
|
|
this.next = node;
|
||
|
|
|
||
|
|
list.size++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public void remove() {
|
||
|
|
if (last == null)
|
||
|
|
return;
|
||
|
|
|
||
|
|
SinglyLinkedList.Node<T> p = null;
|
||
|
|
SinglyLinkedList.Node<T> node = this.last;
|
||
|
|
while (node!= null && !(node.equals(last))) {
|
||
|
|
p = node;
|
||
|
|
node = node.next;
|
||
|
|
}
|
||
|
|
|
||
|
|
SinglyLinkedList.Node<T> n = last.next;
|
||
|
|
if (p != null)
|
||
|
|
p.next = n;
|
||
|
|
|
||
|
|
if (last.equals(list.head))
|
||
|
|
list.head = n;
|
||
|
|
if (last.equals(list.tail))
|
||
|
|
list.tail = p;
|
||
|
|
|
||
|
|
list.size--;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public void set(T value) {
|
||
|
|
if (last != null)
|
||
|
|
last.value = value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean hasNext() {
|
||
|
|
return (next!=null);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean hasPrevious() {
|
||
|
|
return (prev!=null);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public int nextIndex() {
|
||
|
|
return index;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public int previousIndex() {
|
||
|
|
return index-1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public T next() {
|
||
|
|
if (next == null)
|
||
|
|
throw new java.util.NoSuchElementException();
|
||
|
|
|
||
|
|
index++;
|
||
|
|
last = next;
|
||
|
|
prev = next;
|
||
|
|
next = next.next;
|
||
|
|
|
||
|
|
return last.value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public T previous() {
|
||
|
|
if (prev == null)
|
||
|
|
throw new java.util.NoSuchElementException();
|
||
|
|
|
||
|
|
index--;
|
||
|
|
last = prev;
|
||
|
|
next = prev;
|
||
|
|
|
||
|
|
SinglyLinkedList.Node<T> p = null;
|
||
|
|
SinglyLinkedList.Node<T> node = this.list.head;
|
||
|
|
while (node!= null && !(node.equals(prev))) {
|
||
|
|
p = node;
|
||
|
|
node = node.next;
|
||
|
|
}
|
||
|
|
prev = p;
|
||
|
|
|
||
|
|
return last.value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Linked List (doubly link). A linked list is a data structure consisting
|
||
|
|
* of a group of nodes which together represent a sequence.
|
||
|
|
*
|
||
|
|
* http://en.wikipedia.org/wiki/Linked_list
|
||
|
|
*
|
||
|
|
* @author Justin Wetherell <phishman3579@gmail.com>
|
||
|
|
*/
|
||
|
|
public static class DoublyLinkedList<T> extends List<T> {
|
||
|
|
|
||
|
|
private int size = 0;
|
||
|
|
private Node<T> head = null;
|
||
|
|
private Node<T> tail = null;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean add(T value) {
|
||
|
|
return add(new Node<T>(value));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add node to list.
|
||
|
|
*
|
||
|
|
* @param node
|
||
|
|
* to add to list.
|
||
|
|
*/
|
||
|
|
private boolean add(Node<T> node) {
|
||
|
|
if (head == null) {
|
||
|
|
head = node;
|
||
|
|
tail = node;
|
||
|
|
} else {
|
||
|
|
Node<T> prev = tail;
|
||
|
|
prev.next = node;
|
||
|
|
node.prev = prev;
|
||
|
|
tail = node;
|
||
|
|
}
|
||
|
|
size++;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean remove(T value) {
|
||
|
|
// Find the node
|
||
|
|
Node<T> node = head;
|
||
|
|
while (node != null && (!node.value.equals(value))) {
|
||
|
|
node = node.next;
|
||
|
|
}
|
||
|
|
if (node == null)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
// Update the tail, if needed
|
||
|
|
if (node.equals(tail))
|
||
|
|
tail = node.prev;
|
||
|
|
|
||
|
|
Node<T> prev = node.prev;
|
||
|
|
Node<T> next = node.next;
|
||
|
|
if (prev != null && next != null) {
|
||
|
|
prev.next = next;
|
||
|
|
next.prev = prev;
|
||
|
|
} else if (prev != null && next == null) {
|
||
|
|
prev.next = null;
|
||
|
|
} else if (prev == null && next != null) {
|
||
|
|
// Node is the head
|
||
|
|
next.prev = null;
|
||
|
|
head = next;
|
||
|
|
} else {
|
||
|
|
// prev==null && next==null
|
||
|
|
head = null;
|
||
|
|
}
|
||
|
|
size--;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public void clear() {
|
||
|
|
head = null;
|
||
|
|
size = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean contains(T value) {
|
||
|
|
Node<T> node = head;
|
||
|
|
while (node != null) {
|
||
|
|
if (node.value.equals(value))
|
||
|
|
return true;
|
||
|
|
node = node.next;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public int size() {
|
||
|
|
return size;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean validate() {
|
||
|
|
java.util.Set<T> keys = new java.util.HashSet<T>();
|
||
|
|
Node<T> node = head;
|
||
|
|
if (node!=null) {
|
||
|
|
keys.add(node.value);
|
||
|
|
if (node.prev!=null)
|
||
|
|
return false;
|
||
|
|
Node<T> child = node.next;
|
||
|
|
while (child!=null) {
|
||
|
|
if (!validate(child,keys))
|
||
|
|
return false;
|
||
|
|
child = child.next;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return (keys.size()==size);
|
||
|
|
}
|
||
|
|
|
||
|
|
private boolean validate(Node<T> node, java.util.Set<T> keys) {
|
||
|
|
if (node.value==null)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
keys.add(node.value);
|
||
|
|
|
||
|
|
Node<T> child = node.next;
|
||
|
|
if (child!=null) {
|
||
|
|
if (!child.prev.equals(node))
|
||
|
|
return false;
|
||
|
|
} else {
|
||
|
|
if (!node.equals(tail))
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public java.util.List<T> toList() {
|
||
|
|
return (new JavaCompatibleDoublyLinkedList<T>(this));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public java.util.Collection<T> toCollection() {
|
||
|
|
return (new JavaCompatibleDoublyLinkedList<T>(this));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public String toString() {
|
||
|
|
StringBuilder builder = new StringBuilder();
|
||
|
|
Node<T> node = head;
|
||
|
|
while (node != null) {
|
||
|
|
builder.append(node.value).append(", ");
|
||
|
|
node = node.next;
|
||
|
|
}
|
||
|
|
return builder.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
private static class Node<T> {
|
||
|
|
|
||
|
|
private T value = null;
|
||
|
|
private Node<T> prev = null;
|
||
|
|
private Node<T> next = null;
|
||
|
|
|
||
|
|
private Node() { }
|
||
|
|
|
||
|
|
private Node(T value) {
|
||
|
|
this.value = value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public String toString() {
|
||
|
|
return "value=" + value + " previous=" + ((prev != null) ? prev.value : "NULL")
|
||
|
|
+ " next=" + ((next != null) ? next.value : "NULL");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public static class JavaCompatibleDoublyLinkedList<T> extends java.util.AbstractSequentialList<T> {
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|
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||
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private List.DoublyLinkedList<T> list = null;
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|
|
|
||
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public JavaCompatibleDoublyLinkedList(List.DoublyLinkedList<T> list) {
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|
this.list = list;
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|
}
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|
|
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||
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|
/**
|
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|
* {@inheritDoc}
|
||
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|
*/
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|
@Override
|
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|
public boolean add(T value) {
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|
return list.add(value);
|
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|
}
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|
|
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||
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|
/**
|
||
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|
* {@inheritDoc}
|
||
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|
*/
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|
@Override
|
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|
public boolean remove(Object value) {
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|
return list.remove((T)value);
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|
}
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|
|
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|
/**
|
||
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|
* {@inheritDoc}
|
||
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|
*/
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|
|
@Override
|
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|
public boolean contains(Object value) {
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||
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|
return list.contains((T)value);
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|
}
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|
|
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||
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|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public int size() {
|
||
|
|
return list.size();
|
||
|
|
}
|
||
|
|
|
||
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|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public java.util.ListIterator<T> listIterator(int index) {
|
||
|
|
return (new DoublyLinkedListListIterator<T>(list));
|
||
|
|
}
|
||
|
|
|
||
|
|
private static class DoublyLinkedListListIterator<T> implements java.util.ListIterator<T> {
|
||
|
|
|
||
|
|
private int index = 0;
|
||
|
|
|
||
|
|
private DoublyLinkedList<T> list = null;
|
||
|
|
private DoublyLinkedList.Node<T> prev = null;
|
||
|
|
private DoublyLinkedList.Node<T> next = null;
|
||
|
|
private DoublyLinkedList.Node<T> last = null;
|
||
|
|
|
||
|
|
private DoublyLinkedListListIterator(DoublyLinkedList<T> list) {
|
||
|
|
this.list = list;
|
||
|
|
this.next = list.head;
|
||
|
|
this.prev = null;
|
||
|
|
this.last = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public void add(T value) {
|
||
|
|
DoublyLinkedList.Node<T> node = new DoublyLinkedList.Node<T>(value);
|
||
|
|
DoublyLinkedList.Node<T> n = this.next;
|
||
|
|
|
||
|
|
if (this.prev != null)
|
||
|
|
this.prev.next = node;
|
||
|
|
node.prev = this.prev;
|
||
|
|
|
||
|
|
node.next = n;
|
||
|
|
if (n != null)
|
||
|
|
n.prev = node;
|
||
|
|
|
||
|
|
this.next = node;
|
||
|
|
if (this.prev == null)
|
||
|
|
list.head = node; // new root
|
||
|
|
list.size++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public void remove() {
|
||
|
|
if (last == null)
|
||
|
|
return;
|
||
|
|
|
||
|
|
DoublyLinkedList.Node<T> p = last.prev;
|
||
|
|
DoublyLinkedList.Node<T> n = last.next;
|
||
|
|
if (p != null)
|
||
|
|
p.next = n;
|
||
|
|
if (n != null)
|
||
|
|
n.prev = p;
|
||
|
|
if (last.equals(list.head))
|
||
|
|
list.head = n;
|
||
|
|
if (last.equals(list.tail))
|
||
|
|
list.tail = p;
|
||
|
|
|
||
|
|
list.size--;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public void set(T value) {
|
||
|
|
if (last != null)
|
||
|
|
last.value = value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean hasNext() {
|
||
|
|
return (next!=null);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public boolean hasPrevious() {
|
||
|
|
return (prev!=null);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public int nextIndex() {
|
||
|
|
return index;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public int previousIndex() {
|
||
|
|
return index-1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public T next() {
|
||
|
|
if (next == null)
|
||
|
|
throw new java.util.NoSuchElementException();
|
||
|
|
|
||
|
|
index++;
|
||
|
|
last = next;
|
||
|
|
prev = next;
|
||
|
|
next = next.next;
|
||
|
|
|
||
|
|
return last.value;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* {@inheritDoc}
|
||
|
|
*/
|
||
|
|
@Override
|
||
|
|
public T previous() {
|
||
|
|
if (prev == null)
|
||
|
|
throw new java.util.NoSuchElementException();
|
||
|
|
|
||
|
|
index--;
|
||
|
|
last = prev;
|
||
|
|
next = prev;
|
||
|
|
prev = next.prev;
|
||
|
|
|
||
|
|
return last.value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|