1 /*
   2  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import org.testng.annotations.Test;
  25 
  26 import java.util.ArrayList;
  27 import java.util.Arrays;
  28 import java.util.Collection;
  29 import java.util.Iterator;
  30 import java.util.List;
  31 
  32 import static org.testng.Assert.assertEquals;
  33 import static org.testng.Assert.assertTrue;
  34 import static org.testng.Assert.fail;
  35 
  36 /**
  37  * @test
  38  * @run testng IteratorExtensionMethodsTest
  39  * @summary test extension methods on Iterator
  40  */
  41 @Test
  42 public class IteratorExtensionMethodsTest {
  43 
  44     public void testRemoveUnsupported() {
  45         final Iterator iterator = new Iterator() {
  46             @Override
  47             public boolean hasNext() {
  48                 return false;
  49             }
  50             @Override
  51             public Object next() {
  52                 return null;
  53             }
  54         };
  55 
  56         try {
  57             iterator.remove();
  58             fail("expected UnsupportedOperationException from remove not thrown");
  59         } catch (UnsupportedOperationException ignore) {
  60         }
  61     }
  62 
  63     public void testRemoveOverride() {
  64         final IteratorWithRemove iterator = new IteratorWithRemove();
  65         iterator.remove();
  66         assertTrue(iterator.removed);
  67     }
  68 
  69     public void testForEach() throws Exception {
  70         final Integer[] data = new Integer[1000];
  71         for (int i=0; i < data.length; i++) {
  72             data[i] = i;
  73         }
  74         final List<Integer> source = Arrays.asList(data);
  75 
  76         final String[] iterableCollectionClasses = {
  77                 "java.util.ArrayDeque",
  78                 "java.util.ArrayList",
  79                 "java.util.HashSet",
  80                 "java.util.LinkedHashSet",
  81                 "java.util.LinkedList",
  82                 "java.util.PriorityQueue",
  83                 "java.util.TreeSet",
  84                 "java.util.Vector",
  85                 "java.util.concurrent.ConcurrentLinkedDeque",
  86                 "java.util.concurrent.ConcurrentLinkedQueue",
  87                 "java.util.concurrent.ConcurrentSkipListSet",
  88                 "java.util.concurrent.CopyOnWriteArrayList",
  89                 "java.util.concurrent.CopyOnWriteArraySet",
  90                 "java.util.concurrent.LinkedBlockingDeque",
  91                 "java.util.concurrent.LinkedBlockingQueue",
  92                 "java.util.concurrent.LinkedTransferQueue",
  93                 "java.util.concurrent.PriorityBlockingQueue"
  94         };
  95 
  96         for (final String iterableClass : iterableCollectionClasses) {
  97             final Iterable<Integer> iterable =
  98                     (Iterable<Integer>) Class.forName(iterableClass).newInstance();
  99             ((Collection<Integer>) iterable).addAll(source);
 100             final Iterator<Integer> iterator = iterable.iterator();
 101             final List<Integer> target = new ArrayList<>(source.size());
 102             iterator.forEach(target::add);
 103             if ("java.util.HashSet".equals(iterableClass)) {
 104                 target.sort((x, y) -> x - y);
 105                 assertEquals(target, source);
 106             } else {
 107                 assertEquals(target, source);
 108             }
 109         }
 110     }
 111 
 112     static class IteratorWithRemove implements Iterator {
 113 
 114         public boolean removed;
 115 
 116         IteratorWithRemove() {
 117             removed = false;
 118         }
 119 
 120         @Override
 121         public boolean hasNext() {
 122             return false;
 123         }
 124 
 125         @Override
 126         public Object next() {
 127             return null;
 128         }
 129 
 130         @Override
 131         public void remove() {
 132             removed = true;
 133         }
 134     }
 135 }