/*
* Copyright (C) 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package libcore.java.util.beans;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeListenerProxy;
import java.beans.PropertyChangeSupport;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.EventListener;
import java.util.List;
import junit.framework.TestCase;
import libcore.util.SerializationTester;
public final class PropertyChangeSupportTest extends TestCase {
public void testOldAndNewAreBothNull() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
EventLog listener = new EventLog();
support.addPropertyChangeListener(listener);
PropertyChangeEvent nullToNull = new PropertyChangeEvent(bean, "a", null, null);
support.firePropertyChange(nullToNull);
assertEquals(Arrays.<PropertyChangeEvent>asList(nullToNull), listener.log);
}
public void testOldAndNewAreTheSame() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
EventLog listener = new EventLog();
support.addPropertyChangeListener(listener);
PropertyChangeEvent xToX = new PropertyChangeEvent(bean, "a", "x", new String("x"));
support.firePropertyChange(xToX);
assertEquals(Arrays.<PropertyChangeEvent>asList(), listener.log);
}
public void testEventsFilteredByProxies() {
Object bean = new Object();
PropertyChangeEvent eventA = new PropertyChangeEvent(bean, "a", false, true);
PropertyChangeEvent eventB = new PropertyChangeEvent(bean, "b", false, true);
PropertyChangeEvent eventC = new PropertyChangeEvent(bean, "c", false, true);
PropertyChangeSupport support = new PropertyChangeSupport(bean);
EventLog all = new EventLog();
support.addPropertyChangeListener(all);
EventLog proxiedA = new EventLog();
support.addPropertyChangeListener(new PropertyChangeListenerProxy("a", proxiedA));
EventLog addA = new EventLog();
support.addPropertyChangeListener("a", addA);
EventLog addAProxiedB = new EventLog();
support.addPropertyChangeListener("a", new PropertyChangeListenerProxy("b", addAProxiedB));
EventLog proxiedAB = new EventLog();
support.addPropertyChangeListener(new PropertyChangeListenerProxy(
"a", new PropertyChangeListenerProxy("b", proxiedAB)));
EventLog proxiedAA = new EventLog();
support.addPropertyChangeListener(new PropertyChangeListenerProxy("a",
new PropertyChangeListenerProxy("a", proxiedAA)));
EventLog proxiedAAC = new EventLog();
support.addPropertyChangeListener(new PropertyChangeListenerProxy("a",
new PropertyChangeListenerProxy("a",
new PropertyChangeListenerProxy("c", proxiedAAC))));
support.firePropertyChange(eventA);
support.firePropertyChange(eventB);
support.firePropertyChange(eventC);
assertEquals(Arrays.asList(eventA, eventB, eventC), all.log);
assertEquals(Arrays.asList(eventA), proxiedA.log);
assertEquals(Arrays.asList(eventA), addA.log);
assertEquals(Arrays.<PropertyChangeEvent>asList(), addAProxiedB.log);
assertEquals(Arrays.<PropertyChangeEvent>asList(), proxiedAB.log);
assertEquals(Arrays.<PropertyChangeEvent>asList(eventA), proxiedAA.log);
assertEquals(Arrays.<PropertyChangeEvent>asList(), proxiedAAC.log);
}
/**
* Test that we need to do our own equals() work to manually unwrap an
* arbitrary number of proxies.
*/
public void testRemoveWithProxies() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
EventLog all = new EventLog();
support.addPropertyChangeListener(all);
assertEquals(1, support.getPropertyChangeListeners().length);
EventLog proxiedA = new EventLog();
support.addPropertyChangeListener(new PropertyChangeListenerProxy("a", proxiedA));
assertEquals(2, support.getPropertyChangeListeners().length);
EventLog addA = new EventLog();
support.addPropertyChangeListener("a", addA);
assertEquals(3, support.getPropertyChangeListeners().length);
EventLog addAProxiedB = new EventLog();
support.addPropertyChangeListener("a", new PropertyChangeListenerProxy("b", addAProxiedB));
assertEquals(4, support.getPropertyChangeListeners().length);
EventLog proxiedAB = new EventLog();
PropertyChangeListenerProxy proxyAB = new PropertyChangeListenerProxy(
"a", new PropertyChangeListenerProxy("b", proxiedAB));
support.addPropertyChangeListener(proxyAB);
assertEquals(5, support.getPropertyChangeListeners().length);
EventLog proxiedAAC = new EventLog();
support.addPropertyChangeListener(new PropertyChangeListenerProxy("a",
new PropertyChangeListenerProxy("a",
new PropertyChangeListenerProxy("c", proxiedAAC))));
assertEquals(6, support.getPropertyChangeListeners().length);
support.removePropertyChangeListener(all);
assertEquals(5, support.getPropertyChangeListeners().length);
support.removePropertyChangeListener("a", proxiedA);
assertEquals(4, support.getPropertyChangeListeners().length);
support.removePropertyChangeListener(new PropertyChangeListenerProxy("a", addA));
assertEquals(3, support.getPropertyChangeListeners().length);
support.removePropertyChangeListener(
"a", new PropertyChangeListenerProxy("b", addAProxiedB));
assertEquals(2, support.getPropertyChangeListeners().length);
support.removePropertyChangeListener(proxyAB);
assertEquals(1, support.getPropertyChangeListeners().length);
support.removePropertyChangeListener(proxiedAAC);
support.removePropertyChangeListener(new PropertyChangeListenerProxy("a", proxiedAAC));
support.removePropertyChangeListener("a", new PropertyChangeListenerProxy("c", proxiedAAC));
support.removePropertyChangeListener("a", new PropertyChangeListenerProxy("c",
new PropertyChangeListenerProxy("a", proxiedAAC)));
assertEquals(1, support.getPropertyChangeListeners().length);
support.removePropertyChangeListener("a", new PropertyChangeListenerProxy("a",
new PropertyChangeListenerProxy("c", proxiedAAC)));
assertEquals(0, support.getPropertyChangeListeners().length);
}
public void testAddingOneListenerTwice() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
EventLog log = new EventLog();
support.addPropertyChangeListener("a", log);
support.addPropertyChangeListener(log);
support.addPropertyChangeListener(log);
support.addPropertyChangeListener("a", log);
PropertyChangeEvent eventA = new PropertyChangeEvent(bean, "a", false, true);
PropertyChangeEvent eventB = new PropertyChangeEvent(bean, "b", false, true);
support.firePropertyChange(eventA);
support.firePropertyChange(eventB);
assertEquals(Arrays.asList(eventA, eventA, eventA, eventA, eventB, eventB), log.log);
}
public void testAddingAListenerActuallyAddsAProxy() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
PropertyChangeListener listener = new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent event) {}
};
support.addPropertyChangeListener("a", listener);
PropertyChangeListenerProxy p1
= (PropertyChangeListenerProxy) support.getPropertyChangeListeners()[0];
assertEquals(PropertyChangeListenerProxy.class, p1.getClass());
assertTrue(p1 != listener); // weird but consistent with the RI
assertEquals("a", p1.getPropertyName());
assertEquals(listener, p1.getListener());
}
public void testAddingAProxy() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
PropertyChangeListener listener = new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent event) {}
};
PropertyChangeListenerProxy proxy = new PropertyChangeListenerProxy("a", listener);
support.addPropertyChangeListener("b", proxy);
// this proxy sets us up to receive 'b' events
PropertyChangeListenerProxy p1
= (PropertyChangeListenerProxy) support.getPropertyChangeListeners()[0];
assertEquals(PropertyChangeListenerProxy.class, p1.getClass());
assertEquals("b", p1.getPropertyName());
// this proxy sets us up to receive 'a' events
PropertyChangeListenerProxy p2 = (PropertyChangeListenerProxy) p1.getListener();
assertEquals(PropertyChangeListenerProxy.class, p2.getClass());
assertEquals("a", p2.getPropertyName());
assertEquals(listener, p2.getListener());
}
public void testSerialize() {
String s = "aced0005737200206a6176612e6265616e732e50726f70657274794368616e67"
+ "65537570706f727458d5d264574860bb03000349002a70726f706572747943686"
+ "16e6765537570706f727453657269616c697a65644461746156657273696f6e4c"
+ "00086368696c6472656e7400154c6a6176612f7574696c2f486173687461626c6"
+ "53b4c0006736f757263657400124c6a6176612f6c616e672f4f626a6563743b78"
+ "7000000002737200136a6176612e7574696c2e486173687461626c6513bb0f252"
+ "14ae4b803000246000a6c6f6164466163746f724900097468726573686f6c6478"
+ "703f4000000000000877080000000b00000001740001617371007e00000000000"
+ "2707400046265616e7372003a6c6962636f72652e6a6176612e7574696c2e6265"
+ "616e732e50726f70657274794368616e6765537570706f7274546573742445766"
+ "56e744c6f67b92667637d0b6f450200024c00036c6f677400104c6a6176612f75"
+ "74696c2f4c6973743b4c00046e616d657400124c6a6176612f6c616e672f53747"
+ "2696e673b7870737200136a6176612e7574696c2e41727261794c6973747881d2"
+ "1d99c7619d03000149000473697a6578700000000077040000000a7874000b6c6"
+ "97374656e6572546f4171007e000c70787871007e00087371007e00097371007e"
+ "000d0000000077040000000a7874000d6c697374656e6572546f416c6c7078";
Object bean = "bean";
PropertyChangeSupport support = new PropertyChangeSupport(bean);
EventLog listenerToAll = new EventLog();
listenerToAll.name = "listenerToAll";
EventLog listenerToA = new EventLog();
listenerToA.name = "listenerToA";
support.addPropertyChangeListener(listenerToAll);
support.addPropertyChangeListener("a", listenerToA);
support.addPropertyChangeListener("a", listenerToA);
new SerializationTester<PropertyChangeSupport>(support, s) {
@Override protected boolean equals(PropertyChangeSupport a, PropertyChangeSupport b) {
return describe(a.getPropertyChangeListeners())
.equals(describe(b.getPropertyChangeListeners()));
}
@Override protected void verify(PropertyChangeSupport deserialized) {
assertEquals("[a to listenerToA, a to listenerToA, listenerToAll]",
describe(deserialized.getPropertyChangeListeners()));
}
}.test();
}
private String describe(PropertyChangeListener[] listeners) {
List<String> result = new ArrayList<String>();
for (PropertyChangeListener listener : listeners) {
result.add(describe(listener));
}
Collections.sort(result);
return result.toString();
}
private String describe(EventListener listener) {
if (listener instanceof PropertyChangeListenerProxy) {
PropertyChangeListenerProxy proxy = (PropertyChangeListenerProxy) listener;
return proxy.getPropertyName() + " to " + describe(proxy.getListener());
} else {
return listener.toString();
}
}
static class EventLog implements PropertyChangeListener, Serializable {
String name = "EventLog";
List<PropertyChangeEvent> log = new ArrayList<PropertyChangeEvent>();
public void propertyChange(PropertyChangeEvent event) {
log.add(event);
}
@Override public String toString() {
return name;
}
}
}