146 lines
2.7 KiB
Java
146 lines
2.7 KiB
Java
/*
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* This file is part of the L2J Mobius project.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.l2jmobius.util;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.Queue;
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/**
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* @author UnAfraid
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* @param <E>
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*/
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public final class EmptyQueue<E> implements Queue<E>
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{
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private static final Queue<Object> EMPTY_QUEUE = new EmptyQueue<>();
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@SuppressWarnings("unchecked")
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public static <E> Queue<E> emptyQueue()
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{
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return (Queue<E>) EMPTY_QUEUE;
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}
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@Override
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public int size()
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{
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return 0;
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}
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@Override
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public boolean isEmpty()
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{
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return true;
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}
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@Override
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public boolean contains(Object o)
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{
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return false;
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}
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@Override
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public Iterator<E> iterator()
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{
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return Collections.<E> emptyIterator();
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}
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@Override
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public Object[] toArray()
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{
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return new Object[0];
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}
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@Override
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public <T> T[] toArray(T[] a)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean remove(Object o)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean containsAll(Collection<?> c)
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{
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return false;
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}
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@Override
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public boolean addAll(Collection<? extends E> c)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean removeAll(Collection<?> c)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean retainAll(Collection<?> c)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public void clear()
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean add(E e)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean offer(E e)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public E remove()
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public E poll()
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public E element()
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public E peek()
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{
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throw new UnsupportedOperationException();
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}
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}
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