content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.artemis.utils.collections;
  
  import java.util.NoSuchElementException;
  import java.util.function.Consumer;
  
  public class EmptyList<E> implements LinkedList<E> {
  
  
     private static final LinkedList EMPTY_LIST = new EmptyList();
  
     public static final <T> LinkedList<T> getEmptyList() {
        return (LinkedList<T>) EMPTY_LIST;
     }
  
     private EmptyList() {
     }
  
     @Override
     public E peek() {
        return null;
     }
  
     @Override
     public void addHead(E e) {
        throw new UnsupportedOperationException("method not supported");
     }
  
     @Override
     public void addTail(E e) {
        throw new UnsupportedOperationException("method not supported");
     }
  
     @Override
     public E get(int position) {
        throw new IndexOutOfBoundsException("position = " + position);
     }
  
     @Override
     public E poll() {
        return null;
     }
  
     LinkedListIterator<E> emptyIterator = new LinkedListIterator<>() {
        @Override
        public void repeat() {
        }
  
        @Override
        public E removeLastElement() {
           return null;
        }
  
        @Override
        public void close() {
        }
  
        @Override
        public boolean hasNext() {
           return false;
        }
  
        @Override
        public E next() {
           throw new NoSuchElementException();
        }
     };
  
     @Override
     public LinkedListIterator<E> iterator() {
        return emptyIterator;
     }
  
     @Override
     public void clear() {
        throw new UnsupportedOperationException("method not supported");
     }
  
     @Override
     public int size() {
        return 0;
     }
  
     @Override
     public void clearID() {
        throw new UnsupportedOperationException("method not supported");
     }
  
     @Override
     public void setNodeStore(NodeStore<E> store) {
        throw new UnsupportedOperationException("method not supported");
     }
  
     @Override
     public E removeWithID(String listID, long id) {
        throw new UnsupportedOperationException("method not supported");
     }
  
     @Override
     public void forEach(Consumer<E> consumer) {
     }
  }
  