| /* |
| * Copyright (c) 2018 Google Inc. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @run junit DelegatingIteratorForEachRemaining |
| */ |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.Spliterator; |
| import java.util.function.BiConsumer; |
| import java.util.function.BiFunction; |
| import java.util.function.Consumer; |
| import java.util.function.Function; |
| import java.util.function.Predicate; |
| import java.util.stream.Stream; |
| |
| public class DelegatingIteratorForEachRemaining { |
| |
| static abstract class ForwardingIterator<E> implements Iterator<E> { |
| private final Iterator<E> delegate; |
| |
| protected ForwardingIterator(Iterator<E> delegate) { |
| this.delegate = Objects.requireNonNull(delegate); |
| } |
| |
| @Override public boolean hasNext() { return delegate.hasNext(); } |
| @Override public E next() { return delegate.next(); } |
| @Override public void remove() { delegate.remove(); } |
| @Override public void forEachRemaining(Consumer<? super E> action) { |
| delegate.forEachRemaining(action); |
| } |
| } |
| |
| static final class ThrowingIterator<E> extends ForwardingIterator<E> { |
| public ThrowingIterator(Iterator<E> delegate) { |
| super(delegate); |
| } |
| |
| @Override |
| public void forEachRemaining(Consumer<? super E> action) { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| static abstract class ForwardingSet<E> implements Set<E> { |
| private final Set<E> delegate; |
| |
| protected ForwardingSet(Set<E> delegate) { |
| this.delegate = Objects.requireNonNull(delegate); |
| } |
| |
| @Override public int size() { return delegate.size(); } |
| @Override public boolean isEmpty() { return delegate.isEmpty(); } |
| @Override public boolean contains(Object o) { return delegate.contains(o); } |
| @Override public Iterator<E> iterator() { return delegate.iterator(); } |
| @Override public Object[] toArray() { return delegate.toArray(); } |
| @Override public <T> T[] toArray( T[] ts) { return delegate.toArray(ts); } |
| @Override public boolean add(E e) { return delegate.add(e); } |
| @Override public boolean remove(Object o) { return delegate.remove(o); } |
| @Override public boolean containsAll( Collection<?> c) { return delegate.containsAll(c); } |
| @Override public boolean addAll( Collection<? extends E> c) { return delegate.addAll(c); } |
| @Override public boolean retainAll( Collection<?> c) { return delegate.retainAll(c); } |
| @Override public boolean removeAll( Collection<?> c) { return delegate.removeAll(c); } |
| @Override public void clear() { delegate.clear(); } |
| @Override public boolean equals(Object o) { return delegate.equals(o); } |
| @Override public int hashCode() { return delegate.hashCode(); } |
| @Override public Spliterator<E> spliterator() { return delegate.spliterator(); } |
| @Override public boolean removeIf(Predicate<? super E> filter) { return delegate.removeIf(filter); } |
| @Override public Stream<E> stream() { return delegate.stream(); } |
| @Override public Stream<E> parallelStream() { return delegate.parallelStream(); } |
| @Override public void forEach(Consumer<? super E> action) { delegate.forEach(action); } |
| } |
| |
| static class ThrowingSet<E> extends ForwardingSet<E> { |
| public ThrowingSet(Set<E> delegate) { |
| super(delegate); |
| } |
| |
| @Override |
| public ThrowingIterator<E> iterator() { |
| return new ThrowingIterator<>(super.iterator()); |
| } |
| } |
| |
| static abstract class ForwardingMap<K, V> implements Map<K, V> { |
| private final Map<K, V> delegate; |
| |
| public ForwardingMap(Map<K, V> delegate) { |
| this.delegate = delegate; |
| } |
| |
| @Override public int size() { return delegate.size(); } |
| @Override public boolean isEmpty() { return delegate.isEmpty(); } |
| @Override public boolean containsKey(Object o) { return delegate.containsKey(o); } |
| @Override public boolean containsValue(Object o) { return delegate.containsValue(o); } |
| @Override public V get(Object o) { return delegate.get(o); } |
| @Override public V put(K k, V v) { return delegate.put(k, v); } |
| @Override public V remove(Object o) { return delegate.remove(o); } |
| @Override public void putAll(Map<? extends K, ? extends V> map) { delegate.putAll(map); } |
| @Override public void clear() { delegate.clear(); } |
| @Override public Set<K> keySet() { return delegate.keySet(); } |
| @Override public Collection<V> values() { return delegate.values(); } |
| @Override public Set<Entry<K, V>> entrySet() { return delegate.entrySet(); } |
| @Override public boolean equals(Object o) { return delegate.equals(o); } |
| @Override public int hashCode() { return delegate.hashCode(); } |
| @Override public V getOrDefault(Object key, V defaultValue) { return delegate.getOrDefault(key, defaultValue); } |
| @Override public void forEach(BiConsumer<? super K, ? super V> action) { delegate.forEach(action); } |
| @Override public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) { delegate.replaceAll(function); } |
| @Override public V putIfAbsent(K key, V value) { return delegate.putIfAbsent(key, value); } |
| @Override public boolean remove(Object key, Object value) { return delegate.remove(key, value); } |
| @Override public boolean replace(K key, V oldValue, V newValue) { return delegate.replace(key, oldValue, newValue); } |
| @Override public V replace(K key, V value) { return delegate.replace(key, value); } |
| @Override public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) { return delegate.computeIfAbsent(key, mappingFunction); } |
| @Override public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { return delegate.computeIfPresent(key, remappingFunction); } |
| @Override public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { return delegate.compute(key, remappingFunction); } |
| @Override public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) { return delegate.merge(key, value, remappingFunction); } |
| } |
| |
| static class ThrowingMap<K, V> extends ForwardingMap<K, V> { |
| public ThrowingMap(Map<K, V> delegate) { |
| super(delegate); |
| } |
| |
| @Override |
| public ThrowingSet<Entry<K, V>> entrySet() { |
| return new ThrowingSet<>(super.entrySet()); |
| } |
| |
| @Override |
| public Set<K> keySet() { |
| return new ThrowingSet(super.keySet()); |
| } |
| } |
| |
| static<E> void assertThrowingIterator(Iterator<E> iterator) { |
| try { |
| iterator.forEachRemaining((entry) -> {}); |
| Assert.fail(); |
| } catch (UnsupportedOperationException expected) { |
| } |
| } |
| |
| private static Map<String, Object> map() { |
| Map<String, Object> map = new HashMap<>(); |
| map.put("name", "Bill"); |
| map.put("age", 23); |
| return new ThrowingMap<>(map); |
| } |
| |
| @Test public void testUnwrapped() { |
| assertThrowingIterator(map().entrySet().iterator()); |
| assertThrowingIterator(map().keySet().iterator()); |
| } |
| |
| @Test public void test_unmodifiableMap_entrySet() { |
| assertThrowingIterator(Collections.unmodifiableMap(map()).entrySet().iterator()); |
| } |
| |
| @Test public void test_checkedMap_entrySet() { |
| assertThrowingIterator(Collections.checkedMap(map(), String.class, Object.class).entrySet().iterator()); |
| } |
| |
| @Test public void test_entrySet_checkedSet() { |
| Set<Map.Entry<String, Object>> entrySet = map().entrySet(); |
| Class clazz = entrySet.iterator().next().getClass(); |
| assertThrowingIterator(Collections.checkedSet(entrySet, clazz).iterator()); |
| } |
| } |