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/* |
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* Copyright 2000 Sun Microsystems, 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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|
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/** |
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* @test |
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* @bug 4245809 |
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* @summary Basic test for LinkedHashSet. (Based on SetBash) |
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*/ |
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|
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import java.util.*; |
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import java.io.*; |
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|
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public class Basic { |
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static Random rnd = new Random(666); |
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|
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public static void main(String[] args) throws Exception { |
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int numItr = 500; |
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int setSize = 500; |
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|
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for (int i=0; i<numItr; i++) { |
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Set s1 = new LinkedHashSet(); |
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AddRandoms(s1, setSize); |
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|
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Set s2 = new LinkedHashSet(); |
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AddRandoms(s2, setSize); |
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|
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Set intersection = clone(s1); |
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intersection.retainAll(s2); |
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Set diff1 = clone(s1); diff1.removeAll(s2); |
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Set diff2 = clone(s2); diff2.removeAll(s1); |
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Set union = clone(s1); union.addAll(s2); |
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|
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if (diff1.removeAll(diff2)) |
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throw new Exception("Set algebra identity 2 failed"); |
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if (diff1.removeAll(intersection)) |
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throw new Exception("Set algebra identity 3 failed"); |
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if (diff2.removeAll(diff1)) |
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throw new Exception("Set algebra identity 4 failed"); |
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if (diff2.removeAll(intersection)) |
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throw new Exception("Set algebra identity 5 failed"); |
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if (intersection.removeAll(diff1)) |
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throw new Exception("Set algebra identity 6 failed"); |
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if (intersection.removeAll(diff1)) |
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throw new Exception("Set algebra identity 7 failed"); |
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|
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intersection.addAll(diff1); intersection.addAll(diff2); |
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if (!intersection.equals(union)) |
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throw new Exception("Set algebra identity 1 failed"); |
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|
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if (new LinkedHashSet(union).hashCode() != union.hashCode()) |
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throw new Exception("Incorrect hashCode computation."); |
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|
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Iterator e = union.iterator(); |
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while (e.hasNext()) |
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if (!intersection.remove(e.next())) |
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throw new Exception("Couldn't remove element from copy."); |
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if (!intersection.isEmpty()) |
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throw new Exception("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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throw new Exception("Set doesn't contain one of its elements."); |
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e.remove(); |
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if (union.contains(o)) |
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throw new Exception("Set contains element after deletion."); |
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} |
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if (!union.isEmpty()) |
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throw new Exception("Set nonempty after deleting all elements."); |
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|
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s1.clear(); |
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if (!s1.isEmpty()) |
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throw new Exception("Set nonempty after clear."); |
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} |
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System.err.println("Success."); |
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} |
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|
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static Set clone(Set s) throws Exception { |
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Set clone; |
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int method = rnd.nextInt(3); |
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clone = (method==0 ? (Set) ((LinkedHashSet)s).clone() : |
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(method==1 ? new LinkedHashSet(Arrays.asList(s.toArray())) : |
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serClone(s))); |
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if (!s.equals(clone)) |
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throw new Exception("Set not equal to copy: "+method); |
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if (!s.containsAll(clone)) |
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throw new Exception("Set does not contain copy."); |
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if (!clone.containsAll(s)) |
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throw new Exception("Copy does not contain set."); |
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return clone; |
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} |
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|
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private static Set serClone(Set m) { |
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Set result = null; |
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try { |
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// Serialize |
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ByteArrayOutputStream bos = new ByteArrayOutputStream(); |
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ObjectOutputStream out = new ObjectOutputStream(bos); |
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out.writeObject(m); |
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out.flush(); |
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|
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// Deserialize |
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ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray()); |
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out.close(); |
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ObjectInputStream in = new ObjectInputStream(bis); |
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result = (Set)in.readObject(); |
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in.close(); |
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} catch (Exception e) { |
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e.printStackTrace(); |
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} |
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return result; |
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} |
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|
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static void AddRandoms(Set s, int n) throws Exception { |
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for (int i=0; i<n; i++) { |
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int r = rnd.nextInt() % n; |
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Integer e = new Integer(r < 0 ? -r : r); |
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|
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int preSize = s.size(); |
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boolean prePresent = s.contains(e); |
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boolean added = s.add(e); |
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if (!s.contains(e)) |
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throw new Exception("Element not present after addition."); |
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if (added == prePresent) |
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throw new Exception("added == alreadyPresent"); |
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int postSize = s.size(); |
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if (added && preSize == postSize) |
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throw new Exception("Add returned true, but size didn't change."); |
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if (!added && preSize != postSize) |
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throw new Exception("Add returned false, but size changed."); |
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} |
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} |
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} |
