| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * Licensed 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 com.intellij.util.containers; |
| |
| import java.util.ListIterator; |
| import java.util.NoSuchElementException; |
| |
| public class EmptyListIterator<E> extends EmptyIterator<E> implements ListIterator<E> { |
| private static final EmptyListIterator<Object> INSTANCE = new EmptyListIterator<Object>(); |
| |
| public static <E> EmptyListIterator<E> getInstance() { |
| //noinspection unchecked |
| return (EmptyListIterator<E>)INSTANCE; |
| } |
| |
| public boolean hasPrevious() { |
| return false; |
| } |
| |
| public E previous() { |
| throw new NoSuchElementException(); |
| } |
| |
| public int nextIndex() { |
| return 0; |
| } |
| |
| public int previousIndex() { |
| return -1; |
| } |
| |
| public void set(E e) { |
| throw new IllegalStateException(); |
| } |
| |
| public void add(E e) { |
| throw new UnsupportedOperationException(); |
| } |
| } |