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Merge branch 'LANG-1137' 

LANG-1137: Add check for duplicate event listener in EventListenerSupport.
Thanks to Metthew Aguirre.
This commit is contained in:
Benedikt Ritter 2015-05-12 08:29:38 +02:00
parent 61bec859ac 4ccfde2b57
commit 19dace1b8a
3 changed files with 61 additions and 34 deletions
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1
src/changes/changes.xml
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@ -22,6 +22,7 @@
<body> <body>
<release version="3.5" date="tba" description="tba"> <release version="3.5" date="tba" description="tba">
<action issue="LANG-1137" type="add" dev="britter" due-to="Matthew Aguirre">Add check for duplicate event listener in EventListenerSupport</action>
<action issue="LANG-1133" type="bug" dev="chas" due-to="Pascal Schumacher">FastDateParser_TimeZoneStrategyTest#testTimeZoneStrategyPattern fails on Windows with German Locale</action> <action issue="LANG-1133" type="bug" dev="chas" due-to="Pascal Schumacher">FastDateParser_TimeZoneStrategyTest#testTimeZoneStrategyPattern fails on Windows with German Locale</action>
<action issue="LANG-1135" type="add" dev="britter" due-to="Eduardo Martins">Add method containsAllWords to WordUtils</action> <action issue="LANG-1135" type="add" dev="britter" due-to="Eduardo Martins">Add method containsAllWords to WordUtils</action>
<action issue="LANG-1132" type="add" dev="britter" due-to="Jack Tan">ReflectionToStringBuilder doesn't throw IllegalArgumentException when the constructor's object param is null</action> <action issue="LANG-1132" type="add" dev="britter" due-to="Jack Tan">ReflectionToStringBuilder doesn't throw IllegalArgumentException when the constructor's object param is null</action>

19
src/main/java/org/apache/commons/lang3/event/EventListenerSupport.java
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@ -179,8 +179,27 @@ public L fire() {
* <code>null</code>. * <code>null</code>.
*/ */
public void addListener(final L listener) { public void addListener(final L listener) {
addListener(listener, true);
}
/**
* Registers an event listener. Will not add a pre-existing listener
* object to the list if <code>allowDuplicate</code> is false.
*
* @param listener the event listener (may not be <code>null</code>).
* @param allowDuplicate the flag for determining if duplicate listener
* objects are allowed to be registered.
*
* @throws NullPointerException if <code>listener</code> is
* <code>null</code>.
*/
public void addListener(final L listener, boolean allowDuplicate) {
Validate.notNull(listener, "Listener object cannot be null."); Validate.notNull(listener, "Listener object cannot be null.");
if (allowDuplicate) {
listeners.add(listener); listeners.add(listener);
} else if (!listeners.contains(listener)) {
listeners.add(listener);
}
} }
/** /**

63
src/test/java/org/apache/commons/lang3/event/EventListenerSupportTest.java
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@ -39,25 +39,42 @@
/** /**
* @since 3.0 * @since 3.0
*/ */
public class EventListenerSupportTest public class EventListenerSupportTest {
{
@Test
public void testAddListenerNoDuplicates() {
final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class);
final VetoableChangeListener[] listeners = listenerSupport.getListeners();
assertEquals(0, listeners.length);
assertEquals(VetoableChangeListener.class, listeners.getClass().getComponentType());
final VetoableChangeListener[] empty = listeners;
//for fun, show that the same empty instance is used
assertSame(empty, listenerSupport.getListeners());
final VetoableChangeListener listener1 = EasyMock.createNiceMock(VetoableChangeListener.class);
listenerSupport.addListener(listener1);
assertEquals(1, listenerSupport.getListeners().length);
listenerSupport.addListener(listener1, false);
assertEquals(1, listenerSupport.getListeners().length);
listenerSupport.removeListener(listener1);
assertSame(empty, listenerSupport.getListeners());
}
@Test(expected = NullPointerException.class) @Test(expected = NullPointerException.class)
public void testAddNullListener() public void testAddNullListener() {
{
final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class); final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class);
listenerSupport.addListener(null); listenerSupport.addListener(null);
} }
@Test(expected = NullPointerException.class) @Test(expected = NullPointerException.class)
public void testRemoveNullListener() public void testRemoveNullListener() {
{
final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class); final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class);
listenerSupport.removeListener(null); listenerSupport.removeListener(null);
} }
@Test @Test
public void testEventDispatchOrder() throws PropertyVetoException public void testEventDispatchOrder() throws PropertyVetoException {
{
final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class); final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class);
final List<VetoableChangeListener> calledListeners = new ArrayList<VetoableChangeListener>(); final List<VetoableChangeListener> calledListeners = new ArrayList<VetoableChangeListener>();
@ -72,23 +89,19 @@ public void testEventDispatchOrder() throws PropertyVetoException
} }
@Test(expected = IllegalArgumentException.class) @Test(expected = IllegalArgumentException.class)
public void testCreateWithNonInterfaceParameter() public void testCreateWithNonInterfaceParameter() {
{
EventListenerSupport.create(String.class); EventListenerSupport.create(String.class);
} }
@Test(expected = NullPointerException.class) @Test(expected = NullPointerException.class)
public void testCreateWithNullParameter() public void testCreateWithNullParameter() {
{
EventListenerSupport.create(null); EventListenerSupport.create(null);
} }
@Test @Test
public void testRemoveListenerDuringEvent() throws PropertyVetoException public void testRemoveListenerDuringEvent() throws PropertyVetoException {
{
final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class); final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class);
for (int i = 0; i < 10; ++i) for (int i = 0; i < 10; ++i) {
{
addDeregisterListener(listenerSupport); addDeregisterListener(listenerSupport);
} }
assertEquals(listenerSupport.getListenerCount(), 10); assertEquals(listenerSupport.getListenerCount(), 10);
@ -198,25 +211,19 @@ public Object invoke(final Object proxy, final Method method, final Object[] arg
EasyMock.verify(listener); EasyMock.verify(listener);
} }
private void addDeregisterListener(final EventListenerSupport<VetoableChangeListener> listenerSupport) private void addDeregisterListener(final EventListenerSupport<VetoableChangeListener> listenerSupport) {
{ listenerSupport.addListener(new VetoableChangeListener() {
listenerSupport.addListener(new VetoableChangeListener()
{
@Override @Override
public void vetoableChange(final PropertyChangeEvent e) public void vetoableChange(final PropertyChangeEvent e) {
{
listenerSupport.removeListener(this); listenerSupport.removeListener(this);
} }
}); });
} }
private VetoableChangeListener createListener(final List<VetoableChangeListener> calledListeners) private VetoableChangeListener createListener(final List<VetoableChangeListener> calledListeners) {
{ return new VetoableChangeListener() {
return new VetoableChangeListener()
{
@Override @Override
public void vetoableChange(final PropertyChangeEvent e) public void vetoableChange(final PropertyChangeEvent e) {
{
calledListeners.add(this); calledListeners.add(this);
} }
}; };