906f1ca4d7
Reviewed-by: sundar, smarks
225 lines
10 KiB
Java
225 lines
10 KiB
Java
/*
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* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2018 Google Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @run junit DelegatingIteratorForEachRemaining
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*/
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import org.junit.Assert;
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import org.junit.Test;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Set;
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import java.util.Spliterator;
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import java.util.function.BiConsumer;
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import java.util.function.BiFunction;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.stream.Stream;
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public class DelegatingIteratorForEachRemaining {
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static abstract class ForwardingIterator<E> implements Iterator<E> {
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private final Iterator<E> delegate;
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protected ForwardingIterator(Iterator<E> delegate) {
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this.delegate = Objects.requireNonNull(delegate);
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}
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@Override public boolean hasNext() { return delegate.hasNext(); }
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@Override public E next() { return delegate.next(); }
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@Override public void remove() { delegate.remove(); }
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@Override public void forEachRemaining(Consumer<? super E> action) {
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delegate.forEachRemaining(action);
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}
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}
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static final class ThrowingIterator<E> extends ForwardingIterator<E> {
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public ThrowingIterator(Iterator<E> delegate) {
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super(delegate);
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}
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@Override
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public void forEachRemaining(Consumer<? super E> action) {
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throw new UnsupportedOperationException();
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}
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}
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static abstract class ForwardingSet<E> implements Set<E> {
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private final Set<E> delegate;
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protected ForwardingSet(Set<E> delegate) {
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this.delegate = Objects.requireNonNull(delegate);
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}
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@Override public int size() { return delegate.size(); }
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@Override public boolean isEmpty() { return delegate.isEmpty(); }
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@Override public boolean contains(Object o) { return delegate.contains(o); }
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@Override public Iterator<E> iterator() { return delegate.iterator(); }
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@Override public Object[] toArray() { return delegate.toArray(); }
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@Override public <T> T[] toArray( T[] ts) { return delegate.toArray(ts); }
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@Override public boolean add(E e) { return delegate.add(e); }
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@Override public boolean remove(Object o) { return delegate.remove(o); }
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@Override public boolean containsAll( Collection<?> c) { return delegate.containsAll(c); }
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@Override public boolean addAll( Collection<? extends E> c) { return delegate.addAll(c); }
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@Override public boolean retainAll( Collection<?> c) { return delegate.retainAll(c); }
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@Override public boolean removeAll( Collection<?> c) { return delegate.removeAll(c); }
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@Override public void clear() { delegate.clear(); }
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@Override public boolean equals(Object o) { return delegate.equals(o); }
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@Override public int hashCode() { return delegate.hashCode(); }
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@Override public Spliterator<E> spliterator() { return delegate.spliterator(); }
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@Override public boolean removeIf(Predicate<? super E> filter) { return delegate.removeIf(filter); }
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@Override public Stream<E> stream() { return delegate.stream(); }
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@Override public Stream<E> parallelStream() { return delegate.parallelStream(); }
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@Override public void forEach(Consumer<? super E> action) { delegate.forEach(action); }
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}
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static class ThrowingSet<E> extends ForwardingSet<E> {
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public ThrowingSet(Set<E> delegate) {
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super(delegate);
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}
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@Override
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public ThrowingIterator<E> iterator() {
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return new ThrowingIterator<>(super.iterator());
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}
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}
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static abstract class ForwardingMap<K, V> implements Map<K, V> {
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private final Map<K, V> delegate;
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public ForwardingMap(Map<K, V> delegate) {
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this.delegate = delegate;
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}
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@Override public int size() { return delegate.size(); }
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@Override public boolean isEmpty() { return delegate.isEmpty(); }
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@Override public boolean containsKey(Object o) { return delegate.containsKey(o); }
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@Override public boolean containsValue(Object o) { return delegate.containsValue(o); }
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@Override public V get(Object o) { return delegate.get(o); }
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@Override public V put(K k, V v) { return delegate.put(k, v); }
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@Override public V remove(Object o) { return delegate.remove(o); }
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@Override public void putAll(Map<? extends K, ? extends V> map) { delegate.putAll(map); }
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@Override public void clear() { delegate.clear(); }
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@Override public Set<K> keySet() { return delegate.keySet(); }
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@Override public Collection<V> values() { return delegate.values(); }
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@Override public Set<Entry<K, V>> entrySet() { return delegate.entrySet(); }
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@Override public boolean equals(Object o) { return delegate.equals(o); }
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@Override public int hashCode() { return delegate.hashCode(); }
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@Override public V getOrDefault(Object key, V defaultValue) { return delegate.getOrDefault(key, defaultValue); }
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@Override public void forEach(BiConsumer<? super K, ? super V> action) { delegate.forEach(action); }
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@Override public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) { delegate.replaceAll(function); }
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@Override public V putIfAbsent(K key, V value) { return delegate.putIfAbsent(key, value); }
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@Override public boolean remove(Object key, Object value) { return delegate.remove(key, value); }
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@Override public boolean replace(K key, V oldValue, V newValue) { return delegate.replace(key, oldValue, newValue); }
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@Override public V replace(K key, V value) { return delegate.replace(key, value); }
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@Override public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) { return delegate.computeIfAbsent(key, mappingFunction); }
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@Override public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { return delegate.computeIfPresent(key, remappingFunction); }
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@Override public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { return delegate.compute(key, remappingFunction); }
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@Override public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) { return delegate.merge(key, value, remappingFunction); }
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}
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static class ThrowingMap<K, V> extends ForwardingMap<K, V> {
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public ThrowingMap(Map<K, V> delegate) {
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super(delegate);
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}
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@Override
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public ThrowingSet<Entry<K, V>> entrySet() {
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return new ThrowingSet<>(super.entrySet());
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}
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@Override
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public Set<K> keySet() {
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return new ThrowingSet(super.keySet());
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}
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}
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static<E> void assertThrowingIterator(Iterator<E> iterator) {
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try {
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iterator.forEachRemaining((entry) -> {});
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Assert.fail();
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} catch (UnsupportedOperationException expected) {
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}
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}
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private static Map<String, Object> map() {
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Map<String, Object> map = new HashMap<>();
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map.put("name", "Bill");
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map.put("age", 23);
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return new ThrowingMap<>(map);
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}
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@Test public void testUnwrapped() {
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assertThrowingIterator(map().entrySet().iterator());
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assertThrowingIterator(map().keySet().iterator());
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}
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@Test public void test_unmodifiableMap_entrySet() {
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assertThrowingIterator(Collections.unmodifiableMap(map()).entrySet().iterator());
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}
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@Test public void test_checkedMap_entrySet() {
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assertThrowingIterator(Collections.checkedMap(map(), String.class, Object.class).entrySet().iterator());
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}
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@Test public void test_entrySet_checkedSet() {
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Set<Map.Entry<String, Object>> entrySet = map().entrySet();
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Class clazz = entrySet.iterator().next().getClass();
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assertThrowingIterator(Collections.checkedSet(entrySet, clazz).iterator());
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}
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/**
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* Calls Collections.unmodifiableMap().entrySet().iterator().forEachRemaining() by passing
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* that method a {@code null} action and expects that call to fail with a
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* {@code NullPointerException}.
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*/
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@Test
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public void testUnmodifiableForEachRemainingNPE() {
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final Iterator<?> it = Collections.unmodifiableMap(Map.of()).entrySet().iterator();
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// pass null action and expect a NPE
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Assert.assertThrows(NullPointerException.class, () -> it.forEachRemaining(null));
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}
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/**
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* Calls Collections.checkedMap().entrySet().iterator().forEachRemaining() by passing
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* that method a {@code null} action and expects that call to fail with a
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* {@code NullPointerException}.
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*/
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@Test
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public void testCheckedMapForEachRemainingNPE() {
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final Iterator<?> it = Collections.checkedMap(Map.of(), String.class,
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String.class).entrySet().iterator();
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// pass null "action" and expect it to fail with NPE
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Assert.assertThrows(NullPointerException.class, () -> it.forEachRemaining(null));
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}
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}
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