/*
* Copyright (c) 2014, grossmann
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the jo-widgets.org nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.jowidgets.util.collection;
import org.jowidgets.util.EmptyCheck;
import org.jowidgets.util.collection.IObserverSetFactory.Strategy;
import org.junit.Assert;
import org.junit.Test;
public class ObserverSetTest {
@Test(expected = IllegalArgumentException.class)
public void testAddNull() {
testAddNull(create(Strategy.HIGH_PERFORMANCE));
testAddNull(create(Strategy.LOW_MEMORY));
}
private void testAddNull(final IObserverSet<ListenerMock> set) {
set.add(null);
}
@Test(expected = IllegalArgumentException.class)
public void testRemoveNull() {
testRemoveNull(create(Strategy.HIGH_PERFORMANCE));
testRemoveNull(create(Strategy.LOW_MEMORY));
}
private void testRemoveNull(final IObserverSet<ListenerMock> set) {
set.remove(null);
}
@Test
public void testAddAndRemove() {
testAddAndRemove(create(Strategy.HIGH_PERFORMANCE));
testAddAndRemove(create(Strategy.LOW_MEMORY));
}
private void testAddAndRemove(final IObserverSet<ListenerMock> set) {
final ListenerMock a = new ListenerMock("A");
final ListenerMock b = new ListenerMock("B");
final ListenerMock c = new ListenerMock("C");
final ListenerMock d = new ListenerMock("D");
final ListenerMock e = new ListenerMock("E");
Assert.assertTrue(EmptyCheck.isEmpty(invokeListeners(set)));
set.add(a);
Assert.assertEquals("A", invokeListeners(set));
set.add(b);
Assert.assertEquals("AB", invokeListeners(set));
set.add(c);
Assert.assertEquals("ABC", invokeListeners(set));
set.add(d);
Assert.assertEquals("ABCD", invokeListeners(set));
set.add(e);
Assert.assertEquals("ABCDE", invokeListeners(set));
//remove first
set.remove(a);
Assert.assertEquals("BCDE", invokeListeners(set));
//remove last
set.remove(e);
Assert.assertEquals("BCD", invokeListeners(set));
//remove in the middle
set.remove(c);
Assert.assertEquals("BD", invokeListeners(set));
//remove first of two elements
set.remove(b);
Assert.assertEquals("D", invokeListeners(set));
//add b again
set.add(b);
Assert.assertEquals("DB", invokeListeners(set));
//remove last of two elements
set.remove(b);
Assert.assertEquals("D", invokeListeners(set));
//remove last
set.remove(d);
Assert.assertTrue(EmptyCheck.isEmpty(invokeListeners(set)));
}
@Test
public void testAddAndRemoveMoreThanOnce() {
testAddAndRemoveMoreThanOnce(create(Strategy.HIGH_PERFORMANCE));
testAddAndRemoveMoreThanOnce(create(Strategy.LOW_MEMORY));
}
private void testAddAndRemoveMoreThanOnce(final IObserverSet<ListenerMock> set) {
final ListenerMock a = new ListenerMock("A");
final ListenerMock b = new ListenerMock("B");
final ListenerMock c = new ListenerMock("C");
final ListenerMock d = new ListenerMock("D");
final ListenerMock e = new ListenerMock("E");
Assert.assertTrue(EmptyCheck.isEmpty(invokeListeners(set)));
set.add(a);
set.add(a);
Assert.assertEquals("A", invokeListeners(set));
set.add(a);
set.add(b);
set.add(b);
Assert.assertEquals("AB", invokeListeners(set));
set.add(a);
set.add(b);
set.add(c);
set.add(c);
Assert.assertEquals("ABC", invokeListeners(set));
set.add(a);
set.add(b);
set.add(c);
set.add(d);
set.add(d);
Assert.assertEquals("ABCD", invokeListeners(set));
set.add(a);
set.add(b);
set.add(c);
set.add(d);
set.add(e);
set.add(e);
Assert.assertEquals("ABCDE", invokeListeners(set));
//remove first
set.remove(a);
set.remove(a);
Assert.assertEquals("BCDE", invokeListeners(set));
//remove last
Assert.assertTrue(set.remove(e));
Assert.assertFalse(set.remove(e));
Assert.assertEquals("BCD", invokeListeners(set));
//remove in the middle
Assert.assertTrue(set.remove(c));
Assert.assertFalse(set.remove(c));
Assert.assertEquals("BD", invokeListeners(set));
//remove first of two elements
Assert.assertTrue(set.remove(b));
Assert.assertFalse(set.remove(b));
Assert.assertEquals("D", invokeListeners(set));
//add b again
set.add(b);
set.add(b);
Assert.assertEquals("DB", invokeListeners(set));
//remove last of two elements
Assert.assertTrue(set.remove(b));
Assert.assertFalse(set.remove(b));
Assert.assertEquals("D", invokeListeners(set));
//remove last
Assert.assertTrue(set.remove(d));
Assert.assertFalse(set.remove(d));
Assert.assertTrue(EmptyCheck.isEmpty(invokeListeners(set)));
}
@Test
public void testRemoveWhileInvoke() {
testRemoveWhileInvoke(create(Strategy.HIGH_PERFORMANCE));
testRemoveWhileInvoke(create(Strategy.LOW_MEMORY));
}
private void testRemoveWhileInvoke(final IObserverSet<ListenerMock> set) {
final RemoveListenerMock a = new RemoveListenerMock("A", set);
final ListenerMock b = new RemoveListenerMock("B", set);
final ListenerMock c = new RemoveListenerMock("C", set);
final ListenerMock d = new RemoveListenerMock("D", set);
final ListenerMock e = new RemoveListenerMock("E", set);
Assert.assertTrue(EmptyCheck.isEmpty(invokeListeners(set)));
set.add(a);
set.add(b);
set.add(c);
set.add(d);
set.add(e);
Assert.assertEquals("ABCDE", invokeListeners(set));
//after first invocation all listners was removed by the listener itself
Assert.assertTrue(EmptyCheck.isEmpty(invokeListeners(set)));
}
private static String invokeListeners(final IObserverSet<? extends ListenerMock> listeners) {
final StringBuilder result = new StringBuilder();
for (final ListenerMock listener : listeners) {
listener.invoke(result);
}
return result.toString();
}
private static IObserverSet<ListenerMock> create(final Strategy strategy) {
return ObserverSetFactory.create(strategy);
}
private static class ListenerMock {
private final String tanga;
private ListenerMock(final String tanga) {
this.tanga = tanga;
}
void invoke(final StringBuilder builder) {
builder.append(tanga);
}
@Override
public String toString() {
return tanga;
}
}
private static class RemoveListenerMock extends ListenerMock {
private final IObserverSet<ListenerMock> set;
private RemoveListenerMock(final String tanga, final IObserverSet<ListenerMock> set) {
super(tanga);
this.set = set;
}
@Override
void invoke(final StringBuilder builder) {
super.invoke(builder);
set.remove(this);
}
}
}