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/**
* ListOfOne.java
*
* Copyright (c) 2013-2016, F(X)yz
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of F(X)yz, any associated website, nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL F(X)yz BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.fxyz3d.collections;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
/**
* This is an immutable list of some arbitrary size backed by a single element.
* @author brian
* @param The type of element in the list
*/
public class ListOfOne implements List {
private final int size;
private final E element;
public ListOfOne(E element, int size) {
if (element == null) {
throw new IllegalArgumentException("A null element is not allowed.");
}
if (size <= 0) {
throw new IllegalArgumentException("The list must contain at least one element");
}
this.element = element;
this.size = size;
}
@Override
public int size() {
return size;
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public boolean contains(Object o) {
return element.equals(o);
}
@Override
public Iterator iterator() {
return new Iterator() {
private int n = 0;
@Override
public boolean hasNext() {
return n < (size - 1);
}
@Override
public E next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
n++;
return element;
}
};
}
@Override
public Object[] toArray() {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public T[] toArray(T[] a) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public boolean add(E e) {
throw new UnsupportedOperationException("Adding elements is not allowed");
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException("Removing elements is not allowed");
}
@Override
public boolean containsAll(Collection c) {
boolean yes = true;
for (Object item : c) {
if (!item.equals(element)) {
yes = false;
break;
}
}
return yes;
}
@Override
public boolean addAll(Collection c) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public boolean addAll(int index, Collection c) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public boolean removeAll(Collection c) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public boolean retainAll(Collection c) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void clear() {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public E get(int index) {
if (index < size) {
return element;
}
else {
throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
}
}
@Override
public E set(int index, E element) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void add(int index, E element) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public E remove(int index) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public int indexOf(Object o) {
int v = -1;
if (element.equals(o)) {
v = 0;
}
return v;
}
@Override
public int lastIndexOf(Object o) {
int v = -1;
if (element.equals(o)) {
v = size - 1;
}
return v;
}
@Override
public ListIterator listIterator() {
return listIterator(0);
}
@Override
public ListIterator listIterator(int index) {
return new ListIterator() {
private final int s = size - index;
private int n = 0;
@Override
public boolean hasNext() {
return n < (s - 1);
}
@Override
public E next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
n++;
return element;
}
@Override
public boolean hasPrevious() {
return n >= 0;
}
@Override
public E previous() {
if (!hasPrevious()) {
throw new NoSuchElementException();
}
n--;
return element;
}
@Override
public int nextIndex() {
return n + 1;
}
@Override
public int previousIndex() {
return n - 1;
}
@Override
public void remove() {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void set(E e) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void add(E e) {
throw new UnsupportedOperationException("Not supported yet.");
}
};
}
@Override
public List subList(int fromIndex, int toIndex) {
return new ListOfOne<>(element, toIndex - fromIndex);
}
}