ArrayHelper.java

package dev.lofiz.arial.event;

import java.util.Iterator;

public class ArrayHelper<T> implements Iterable<T> {

	private T[] elements;

	public ArrayHelper(final T[] array) {
		this.elements = array;
	}

	@SuppressWarnings("unchecked")
	public ArrayHelper() {
		this.elements = (T[]) new Object[0];
	}

	@SuppressWarnings("unchecked")
	public void add(final T t) {

		if (t != null) {
			final Object[] array = new Object[this.size() + 1];

			for (int i = 0; i < array.length; i++) {
				if (i < this.size()) {
					array[i] = this.get(i);
				} else {
					array[i] = t;
				}
			}

			this.set((T[]) array);
		}
	}

	@SuppressWarnings("unchecked")
	public boolean contains(final T t) {

		Object[] array;

		for (int lenght = (array = this.array()).length, i = 0; i < lenght; i++) {
			final T entry = (T) array[i];
			if (entry.equals(t)) {
				return true;
			}
		}

		return false;
	}

	@SuppressWarnings("unchecked")
	public void remove(final T t) {

		if (this.contains(t)) {
			final Object[] array = new Object[this.size() - 1];
			boolean b = true;

			for (int i = 0; i < this.size(); i++) {
				if (b && this.get(i).equals(t)) {
					b = false;
				} else {
					array[b ? i : (i - 1)] = this.get(i);
				}
			}

			this.set((T[]) array);
		}
	}

	public T[] array() {

		return (T[]) this.elements;
	}

	public int size() {

		return this.array().length;
	}

	public void set(final T[] array) {

		this.elements = array;
	}

	public T get(final int index) {

		return this.array()[index];
	}

	@SuppressWarnings("unchecked")
	public void clear() {
		this.elements = (T[]) new Object[0];
	}

	public boolean isEmpty() {
		return this.size() == 0;
	}

	@Override
	public Iterator<T> iterator() {

		return new Iterator<T>() {

			private int index = 0;

			@Override
			public boolean hasNext() {

				return this.index < ArrayHelper.this.size() && ArrayHelper.this.get(this.index) != null;
			}

			@Override
			public T next() {

				return ArrayHelper.this.get(this.index++);
			}

			@Override
			public void remove() {

				ArrayHelper.this.remove(ArrayHelper.this.get(this.index));
			}
		};

	}
}