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/* |
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* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved. |
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* Copyright (c) 2007, 2014, Oracle and/or its affiliates. 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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/* |
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* @test |
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* @bug 5017904 6356890 |
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* @bug 5017904 6356890 8004928 |
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* @summary Test empty iterators, enumerations, and collections |
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*/ |
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import java.util.*; |
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import static java.util.Collections.*; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.Enumeration; |
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import java.util.Hashtable; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.NoSuchElementException; |
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import java.util.concurrent.SynchronousQueue; |
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import static java.util.Collections.emptyEnumeration; |
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import static java.util.Collections.emptyIterator; |
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import static java.util.Collections.emptyList; |
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import static java.util.Collections.emptyListIterator; |
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import static java.util.Collections.emptyMap; |
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import static java.util.Collections.emptySet; |
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import static java.util.Collections.nCopies; |
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import static java.util.Collections.unmodifiableMap; |
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public class EmptyIterator { |
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void test(String[] args) throws Throwable { |
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testEmptyCollection(Collections.<Object>emptyList()); |
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testEmptyCollection(Collections.<Object>emptySet()); |
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// Removed jdk7 dependency from SynchronousQueue. |
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// testEmptyCollection(new java.util.concurrent. |
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// SynchronousQueue<Object>()); |
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testEmptyCollection(emptyList()); |
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testEmptyCollection(emptySet()); |
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testEmptyCollection(new SynchronousQueue<Object>()); |
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testEmptyMap(emptyMap()); |
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testEmptyMap(Collections.<Object, Object>emptyMap()); |
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Hashtable<Object, Object> emptyTable = new Hashtable<Object, Object>(); |
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Hashtable<?,?> emptyTable = new Hashtable<>(); |
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testEmptyEnumeration(emptyTable.keys()); |
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testEmptyEnumeration(emptyTable.elements()); |
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testEmptyIterator(emptyTable.keySet().iterator()); |
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testEmptyIterator(emptyTable.values().iterator()); |
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testEmptyIterator(emptyTable.entrySet().iterator()); |
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testEmptyEnumeration(javax.swing.tree.DefaultMutableTreeNode |
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.EMPTY_ENUMERATION); |
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testEmptyEnumeration(javax.swing.text.SimpleAttributeSet |
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.EMPTY.getAttributeNames()); |
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@SuppressWarnings("unchecked") |
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Iterator<?> x = new sun.tools.java.MethodSet() |
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.lookupName(sun.tools.java.Identifier.lookup("")); |
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testEmptyIterator(x); |
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final Enumeration<EmptyIterator> finalEmptyTyped = emptyEnumeration(); |
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testEmptyEnumeration(finalEmptyTyped); |
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final Enumeration<?> finalEmptyAbstract = emptyEnumeration(); |
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testEmptyEnumeration(finalEmptyAbstract); |
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testEmptyIterator(emptyIterator()); |
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} |
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<T> void testEmptyEnumeration(final Enumeration<T> e) { |
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check(! e.hasMoreElements()); |
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void testEmptyEnumeration(final Enumeration<?> e) { |
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check(e == emptyEnumeration()); |
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check(!e.hasMoreElements()); |
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THROWS(NoSuchElementException.class, |
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new F(){void f(){ e.nextElement(); }}); |
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} |
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<T> void testEmptyIterator(final Iterator<T> it) { |
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void testEmptyIterator(final Iterator<?> it) { |
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check(it == emptyIterator()); |
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check(! it.hasNext()); |
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THROWS(NoSuchElementException.class, |
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new F(){void f(){ it.next(); }}); |
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new F(){void f(){ it.remove(); }}); |
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} |
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void testEmptyMap(Map<Object, Object> m) { |
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void testEmptyMap(Map<?,?> m) { |
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check(m == emptyMap()); |
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check(m.entrySet().iterator() == |
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Collections.<Map.Entry<Object,Object>>emptyIterator()); |
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Collections.<Map.Entry<?,?>>emptyIterator()); |
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check(m.values().iterator() == emptyIterator()); |
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check(m.keySet().iterator() == emptyIterator()); |
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equal(m, unmodifiableMap(m)); |
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testEmptyCollection(m.values()); |
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} |
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<E> void testToArray(final Collection<E> c) { |
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void testToArray(final Collection<?> c) { |
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Object[] a = c.toArray(); |
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equal(a.length, 0); |
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equal(a.getClass().getComponentType(), Object.class); |
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} |
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} |
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<E> void testEmptyCollection(final Collection<E> c) { |
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void testEmptyCollection(final Collection<?> c) { |
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testEmptyIterator(c.iterator()); |
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check(c.iterator() == emptyIterator()); |
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if (c instanceof List) |
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check(((List<?>)c).listIterator() == emptyListIterator()); |
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testToArray(c); |
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} |
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