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/* |
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* Copyright (c) 2003, 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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* 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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/* |
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* @test |
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* @bug 4904067 |
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* @summary Unit test for Collections.checkedList |
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* @author Josh Bloch |
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* @key randomness |
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*/ |
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|
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.ListIterator; |
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import java.util.Random; |
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|
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public class CheckedListBash { |
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static Random rnd = new Random(); |
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|
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public static void main(String[] args) { |
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int numItr = 100; |
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int listSize = 100; |
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|
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for (int i=0; i<numItr; i++) { |
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List s1 = newList(); |
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AddRandoms(s1, listSize); |
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|
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List s2 = newList(); |
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AddRandoms(s2, listSize); |
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|
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List intersection = clone(s1); intersection.retainAll(s2); |
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List diff1 = clone(s1); diff1.removeAll(s2); |
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List diff2 = clone(s2); diff2.removeAll(s1); |
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List union = clone(s1); union.addAll(s2); |
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|
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if (diff1.removeAll(diff2)) |
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fail("List algebra identity 2 failed"); |
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if (diff1.removeAll(intersection)) |
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fail("List algebra identity 3 failed"); |
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if (diff2.removeAll(diff1)) |
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fail("List algebra identity 4 failed"); |
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if (diff2.removeAll(intersection)) |
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fail("List algebra identity 5 failed"); |
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if (intersection.removeAll(diff1)) |
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fail("List algebra identity 6 failed"); |
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if (intersection.removeAll(diff1)) |
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fail("List algebra identity 7 failed"); |
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|
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intersection.addAll(diff1); intersection.addAll(diff2); |
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if (!(intersection.containsAll(union) && |
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union.containsAll(intersection))) |
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fail("List algebra identity 1 failed"); |
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|
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Iterator e = union.iterator(); |
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while (e.hasNext()) |
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intersection.remove(e.next()); |
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if (!intersection.isEmpty()) |
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fail("Copy nonempty after deleting all elements."); |
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|
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e = union.iterator(); |
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while (e.hasNext()) { |
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Object o = e.next(); |
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if (!union.contains(o)) |
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fail("List doesn't contain one of its elements."); |
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e.remove(); |
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} |
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if (!union.isEmpty()) |
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fail("List nonempty after deleting all elements."); |
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|
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s1.clear(); |
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if (s1.size() != 0) |
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fail("Clear didn't reduce size to zero."); |
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|
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s1.addAll(0, s2); |
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if (!(s1.equals(s2) && s2.equals(s1))) |
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fail("addAll(int, Collection) doesn't work."); |
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// Reverse List |
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for (int j=0, n=s1.size(); j<n; j++) |
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s1.set(j, s1.set(n-j-1, s1.get(j))); |
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// Reverse it again |
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for (int j=0, n=s1.size(); j<n; j++) |
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s1.set(j, s1.set(n-j-1, s1.get(j))); |
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if (!(s1.equals(s2) && s2.equals(s1))) |
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fail("set(int, Object) doesn't work"); |
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} |
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|
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List s = newList(); |
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for (int i=0; i<listSize; i++) |
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s.add(new Integer(i)); |
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if (s.size() != listSize) |
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fail("Size of [0..n-1] != n"); |
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|
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List even = clone(s); |
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Iterator it = even.iterator(); |
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while (it.hasNext()) |
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if (((Integer)it.next()).intValue() % 2 == 1) |
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it.remove(); |
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it = even.iterator(); |
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while (it.hasNext()) |
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if (((Integer)it.next()).intValue() % 2 == 1) |
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fail("Failed to remove all odd nubmers."); |
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|
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List odd = clone(s); |
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for (int i=0; i<(listSize/2); i++) |
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odd.remove(i); |
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for (int i=0; i<(listSize/2); i++) |
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if (((Integer)odd.get(i)).intValue() % 2 != 1) |
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fail("Failed to remove all even nubmers."); |
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|
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List all = clone(odd); |
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for (int i=0; i<(listSize/2); i++) |
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all.add(2*i, even.get(i)); |
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if (!all.equals(s)) |
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fail("Failed to reconstruct ints from odds and evens."); |
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|
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all = clone(odd); |
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ListIterator itAll = all.listIterator(all.size()); |
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ListIterator itEven = even.listIterator(even.size()); |
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while (itEven.hasPrevious()) { |
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itAll.previous(); |
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itAll.add(itEven.previous()); |
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itAll.previous(); // ??? |
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} |
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itAll = all.listIterator(); |
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while (itAll.hasNext()) { |
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Integer i = (Integer)itAll.next(); |
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itAll.set(new Integer(i.intValue())); |
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} |
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itAll = all.listIterator(); |
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it = s.iterator(); |
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while (it.hasNext()) |
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if (it.next()==itAll.next()) |
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fail("Iterator.set failed to change value."); |
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if (!all.equals(s)) |
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fail("Failed to reconstruct ints with ListIterator."); |
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|
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it = all.listIterator(); |
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int i=0; |
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while (it.hasNext()) { |
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Object o = it.next(); |
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if (all.indexOf(o) != all.lastIndexOf(o)) |
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fail("Apparent duplicate detected."); |
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if (all.subList(i, all.size()).indexOf(o) != 0 || |
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all.subList(i+1, all.size()).indexOf(o) != -1) |
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fail("subList/indexOf is screwy."); |
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if (all.subList(0,i+1).lastIndexOf(o) != i) |
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fail("subList/lastIndexOf is screwy."); |
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i++; |
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} |
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|
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List l = newList(); |
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AddRandoms(l, listSize); |
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Integer[] ia = (Integer[]) l.toArray(new Integer[0]); |
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if (!l.equals(Arrays.asList(ia))) |
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fail("toArray(Object[]) is hosed (1)"); |
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ia = new Integer[listSize]; |
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Integer[] ib = (Integer[]) l.toArray(ia); |
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if (ia != ib || !l.equals(Arrays.asList(ia))) |
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fail("toArray(Object[]) is hosed (2)"); |
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ia = new Integer[listSize+1]; |
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ia[listSize] = new Integer(69); |
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ib = (Integer[]) l.toArray(ia); |
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if (ia != ib || ia[listSize] != null |
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|| !l.equals(Arrays.asList(ia).subList(0, listSize))) |
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fail("toArray(Object[]) is hosed (3)"); |
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|
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} |
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|
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// Done inefficiently so as to exercise toArray |
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static List clone(List s) { |
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List a = Arrays.asList(s.toArray()); |
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if (s.hashCode() != a.hashCode()) |
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fail("Incorrect hashCode computation."); |
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|
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List clone = newList(); |
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clone.addAll(a); |
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if (!s.equals(clone)) |
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fail("List not equal to copy."); |
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if (!s.containsAll(clone)) |
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fail("List does not contain copy."); |
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if (!clone.containsAll(s)) |
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fail("Copy does not contain list."); |
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|
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return clone; |
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} |
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|
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static List newList() { |
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List s = Collections.checkedList(new ArrayList(), Integer.class); |
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if (!s.isEmpty()) |
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fail("New instance non empty."); |
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return s; |
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} |
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|
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static void AddRandoms(List s, int n) { |
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for (int i = 0; i < n; i++) { |
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Integer e = rnd.nextInt(n); |
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|
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int preSize = s.size(); |
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if (!s.add(e)) |
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fail("Add failed."); |
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int postSize = s.size(); |
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if (postSize - preSize != 1) |
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fail("Add didn't increase size by 1."); |
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} |
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} |
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|
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static void fail(String s) { |
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throw new RuntimeException(s); |
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} |
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} |
