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import java.util.*; |
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|
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public class SetBash { |
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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 = Integer.parseInt(args[1]); |
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int setSize = Integer.parseInt(args[2]); |
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Class cl = null; |
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|
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try { |
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cl = Class.forName(args[0]); |
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} catch(ClassNotFoundException e) { |
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fail("Class " + args[0] + " not found."); |
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} |
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|
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boolean synch = (args.length>3); |
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|
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for (int i=0; i<numItr; i++) { |
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Set s1 = newSet(cl, synch); |
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AddRandoms(s1, setSize); |
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|
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Set s2 = newSet(cl, synch); |
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AddRandoms(s2, setSize); |
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|
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Set intersection = clone(s1, cl, synch); |
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intersection.retainAll(s2); |
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Set diff1 = clone(s1, cl, synch); diff1.removeAll(s2); |
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Set diff2 = clone(s2, cl, synch); diff2.removeAll(s1); |
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Set union = clone(s1, cl, synch); union.addAll(s2); |
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|
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if (diff1.removeAll(diff2)) |
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fail("Set algebra identity 2 failed"); |
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if (diff1.removeAll(intersection)) |
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fail("Set algebra identity 3 failed"); |
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if (diff2.removeAll(diff1)) |
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fail("Set algebra identity 4 failed"); |
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if (diff2.removeAll(intersection)) |
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fail("Set algebra identity 5 failed"); |
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if (intersection.removeAll(diff1)) |
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fail("Set algebra identity 6 failed"); |
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if (intersection.removeAll(diff1)) |
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fail("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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fail("Set 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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if (!intersection.remove(e.next())) |
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fail("Couldn't remove element from copy."); |
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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("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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fail("Set contains element after deletion."); |
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} |
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if (!union.isEmpty()) |
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fail("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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fail("Set nonempty after clear."); |
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} |
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System.out.println("Success."); |
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} |
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|
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// Done inefficiently so as to exercise toArray |
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static Set clone(Set s, Class cl, boolean synch) { |
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Set clone = newSet(cl, synch); |
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clone.addAll(Arrays.asList(s.toArray())); |
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if (!s.equals(clone)) |
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fail("Set not equal to copy."); |
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if (!s.containsAll(clone)) |
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fail("Set does not contain copy."); |
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if (!clone.containsAll(s)) |
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fail("Copy does not contain set."); |
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return clone; |
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} |
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|
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static Set newSet(Class cl, boolean synch) { |
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try { |
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Set s = (Set)cl.newInstance(); |
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if (synch) |
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s = Collections.synchronizedSet(s); |
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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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} catch(Throwable t) { |
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fail("Can't instantiate " + cl + ": " + t); |
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} |
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return null; //Shut up compiler. |
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} |
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|
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static void AddRandoms(Set s, int n) { |
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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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fail ("Element not present after addition."); |
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if (added == prePresent) |
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fail ("added == alreadyPresent"); |
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int postSize = s.size(); |
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if (added && preSize == postSize) |
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fail ("Add returned true, but size didn't change."); |
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if (!added && preSize != postSize) |
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fail ("Add returned false, but size changed."); |
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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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System.out.println(s); |
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System.exit(1); |
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} |
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} |
