1 /* 2 * Copyright (C) 2010 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import com.google.common.annotations.GwtCompatible; 20 21 import junit.framework.TestCase; 22 23 import java.util.Iterator; 24 import java.util.ListIterator; 25 import java.util.NoSuchElementException; 26 27 /** 28 * Tests for UnmodifiableListIterator. 29 * 30 * @author Louis Wasserman 31 */ 32 @GwtCompatible 33 public class UnmodifiableListIteratorTest extends TestCase { 34 public void testRemove() { 35 Iterator<String> iterator = create(); 36 37 assertTrue(iterator.hasNext()); 38 assertEquals("a", iterator.next()); 39 try { 40 iterator.remove(); 41 fail(); 42 } catch (UnsupportedOperationException expected) {} 43 } 44 45 public void testAdd() { 46 ListIterator<String> iterator = create(); 47 48 assertTrue(iterator.hasNext()); 49 assertEquals("a", iterator.next()); 50 assertEquals("b", iterator.next()); 51 assertEquals("b", iterator.previous()); 52 try { 53 iterator.add("c"); 54 fail(); 55 } catch (UnsupportedOperationException expected) {} 56 } 57 58 public void testSet() { 59 ListIterator<String> iterator = create(); 60 61 assertTrue(iterator.hasNext()); 62 assertEquals("a", iterator.next()); 63 assertEquals("b", iterator.next()); 64 assertEquals("b", iterator.previous()); 65 try { 66 iterator.set("c"); 67 fail(); 68 } catch (UnsupportedOperationException expected) {} 69 } 70 71 UnmodifiableListIterator<String> create() { 72 final String[] array = {"a", "b", "c"}; 73 74 return new UnmodifiableListIterator<String>() { 75 int i; 76 @Override 77 public boolean hasNext() { 78 return i < array.length; 79 } 80 @Override 81 public String next() { 82 if (!hasNext()) { 83 throw new NoSuchElementException(); 84 } 85 return array[i++]; 86 } 87 @Override public boolean hasPrevious() { 88 return i > 0; 89 } 90 @Override public int nextIndex() { 91 return i; 92 } 93 @Override public String previous() { 94 if(!hasPrevious()) 95 throw new NoSuchElementException(); 96 return array[--i]; 97 } 98 @Override public int previousIndex() { 99 return i-1; 100 } 101 }; 102 } 103 } 104
