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Event-driven lists for dynamically filtered and sorted tables
/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists;
import ca.odell.glazedlists.impl.beans.BeanConnector;
import ca.odell.glazedlists.impl.testing.ListConsistencyListener;
import ca.odell.glazedlists.matchers.Matcher;
import ca.odell.glazedlists.matchers.Matchers;
import junit.framework.TestCase;
import javax.swing.*;
import java.awt.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.*;
import java.util.List;
/**
* @author Jesse Wilson
*/
public class ObservableElementListTest extends TestCase {
private ObservableElementList labels;
private ListConsistencyListener counter;
public ObservableElementListTest() {
super("Observable Elements - RFE 157");
}
public void setUp() {
labels = new ObservableElementList(new BasicEventList(), GlazedLists.beanConnector(JLabel.class));
counter = ListConsistencyListener.install(labels);
assertEquals(0, counter.getEventCount());
}
public void tearDown() {
labels = null;
counter = null;
}
/**
* Tests ObservableEleemntLists' handling of JavaBean PropertyChangeEvents
*/
public void testJavabeans() {
JLabel ottawa = new JLabel("Rough Riders");
JLabel wrestling = new JLabel("WWF");
labels.add(ottawa);
labels.add(wrestling);
assertEquals(2, counter.getEventCount());
ottawa.setText("Renegades");
assertEquals(3, counter.getEventCount());
assertEquals(1, counter.getChangeCount(2));
wrestling.setText("WWE");
assertEquals(4, counter.getEventCount());
assertEquals(1, counter.getChangeCount(3));
}
public void testAddRemoveListeners() {
final JLabel listElement1 = new JLabel();
final JLabel listElement2 = new JLabel();
final int initialListenerCount = listElement1.getPropertyChangeListeners().length;
labels.add(listElement1);
assertEquals(initialListenerCount + 1, listElement1.getPropertyChangeListeners().length);
labels.remove(listElement1);
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
labels.add(listElement1);
assertEquals(initialListenerCount + 1, listElement1.getPropertyChangeListeners().length);
labels.set(0, null);
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
labels.set(0, listElement1);
assertEquals(initialListenerCount + 1, listElement1.getPropertyChangeListeners().length);
labels.set(0, listElement2);
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
assertEquals(initialListenerCount + 1, listElement2.getPropertyChangeListeners().length);
labels.add(listElement2);
assertEquals(initialListenerCount + 2, listElement2.getPropertyChangeListeners().length);
labels.remove(0);
assertEquals(initialListenerCount + 1, listElement2.getPropertyChangeListeners().length);
labels.remove(0);
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
assertEquals(initialListenerCount, listElement2.getPropertyChangeListeners().length);
}
public void testConstructor() {
try {
new ObservableElementList(new BasicEventList(), null);
fail("Failed to receive a NullPointerException on null connector argument");
} catch (NullPointerException npe) {}
try {
new ObservableElementList(null, GlazedLists.beanConnector(JLabel.class));
fail("Failed to receive a NullPointerException on null source list");
} catch (NullPointerException npe) {}
new ObservableElementList(new BasicEventList(), GlazedLists.beanConnector(JLabel.class));
// if source already has elements, listeners should be installed on them after the
// ObservableElementList constructor has been called
final JLabel listElement1 = new JLabel();
final int initialListenerCount = listElement1.getPropertyChangeListeners().length;
final BasicEventList source = new BasicEventList();
source.add(listElement1);
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
ObservableElementList list = new ObservableElementList(source, GlazedLists.beanConnector(JLabel.class));
assertEquals(initialListenerCount + 1, listElement1.getPropertyChangeListeners().length);
list.remove(listElement1);
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
}
public void testDisposeSingleEventList() {
this.runTestDispose(this.labels);
this.runTestDispose(new ObservableElementList(new BasicEventList(), new MultiEventListJLabelConnector(false)));
}
private void runTestDispose(ObservableElementList labels) {
final JLabel listElement1 = new JLabel();
final int initialListenerCount = listElement1.getPropertyChangeListeners().length;
labels.add(listElement1);
assertEquals(initialListenerCount + 1, listElement1.getPropertyChangeListeners().length);
labels.dispose();
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
assertTrue(listElement1 == labels.get(0));
labels.remove(0);
assertTrue(labels.isEmpty());
}
public void testEventMatcher() {
// match no property change event
final Matcher falseMatcher = Matchers.falseMatcher();
ObservableElementList labelList =
new ObservableElementList(new BasicEventList(), GlazedLists.beanConnector(JLabel.class, falseMatcher));
final JLabel listElement1 = new JLabel();
final JLabel listElement2 = new JLabel();
labelList.add(listElement1);
labelList.add(listElement2);
ListConsistencyListener listener = ListConsistencyListener.install(labelList);
assertEquals(0, listener.getEventCount());
listElement1.setText("Item 1");
listElement2.setText("Item 2");
listElement1.setEnabled(false);
listElement2.setBackground(Color.RED);
assertEquals(0, listener.getEventCount());
// match only property change events for properties 'text and 'enabled'
Matcher byNameMatcher = Matchers.propertyEventNameMatcher(true, new String[] {"text", "enabled"});
labelList = new ObservableElementList(new BasicEventList(), GlazedLists
.beanConnector(JLabel.class, byNameMatcher));
labelList.add(listElement1);
labelList.add(listElement2);
listener = ListConsistencyListener.install(labelList);
assertEquals(0, listener.getEventCount());
listElement1.setText("Text 1");
assertEquals(1, listener.getEventCount());
listElement2.setText("Text 2");
assertEquals(2, listener.getEventCount());
listElement1.setBackground(Color.RED);
assertEquals(2, listener.getEventCount());
listElement2.setForeground(Color.GRAY);
assertEquals(2, listener.getEventCount());
listElement1.setEnabled(true);
assertEquals(3, listener.getEventCount());
// match only property change events for properties 'text and 'enabled'
labelList = new ObservableElementList(new BasicEventList(), GlazedLists
.beanConnector(JLabel.class, true, new String[] {"text", "enabled"}));
labelList.add(listElement1);
labelList.add(listElement2);
listener = ListConsistencyListener.install(labelList);
assertEquals(0, listener.getEventCount());
listElement1.setText("Item 1");
assertEquals(1, listener.getEventCount());
listElement2.setText("Item 2");
assertEquals(2, listener.getEventCount());
listElement1.setBackground(Color.GREEN);
assertEquals(2, listener.getEventCount());
listElement2.setForeground(Color.WHITE);
assertEquals(2, listener.getEventCount());
listElement1.setEnabled(false);
assertEquals(3, listener.getEventCount());
// match all property change events excluding properties 'text' and 'enabled'
labelList = new ObservableElementList(new BasicEventList(), GlazedLists
.beanConnector(JLabel.class, false, new String[] {"text", "enabled"}));
labelList.add(listElement1);
labelList.add(listElement2);
listener = ListConsistencyListener.install(labelList);
assertEquals(0, listener.getEventCount());
listElement1.setText("Text 1");
assertEquals(0, listener.getEventCount());
listElement2.setText("Text 2");
assertEquals(0, listener.getEventCount());
listElement1.setBackground(Color.BLACK);
assertEquals(1, listener.getEventCount());
listElement2.setForeground(Color.YELLOW);
assertEquals(2, listener.getEventCount());
listElement1.setEnabled(true);
assertEquals(2, listener.getEventCount());
}
public void testPickyConnector() {
this.runTestPickyConnector(new ObservableElementList(new BasicEventList(), new PickyJLabelConnector()));
this.runTestPickyConnector(new ObservableElementList(new BasicEventList(), new MultiEventListJLabelConnector(true)));
}
private void runTestPickyConnector(ObservableElementList list) {
final JLabel listElement1 = new JLabel();
final int initialListenerCount = listElement1.getPropertyChangeListeners().length;
list.add(listElement1);
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
list.add(listElement1);
assertEquals(initialListenerCount + 1, listElement1.getPropertyChangeListeners().length);
list.remove(0);
assertEquals(initialListenerCount + 1, listElement1.getPropertyChangeListeners().length);
list.remove(0);
assertTrue(list.isEmpty());
assertEquals(initialListenerCount, listElement1.getPropertyChangeListeners().length);
}
public void testLateBloomingMultiEventListConnector() {
final int bloomCount = 5;
final ObservableElementList list = new ObservableElementList(new BasicEventList(), new LateBloomingMultiEventListJLabelConnector(bloomCount));
final JLabel listElement1 = new JLabel();
final int initialListenerCount1 = listElement1.getPropertyChangeListeners().length;
// install a common listener for the first bloomCount insertions
for (int i = 0; i < bloomCount; i++)
list.add(listElement1);
assertEquals(initialListenerCount1 + bloomCount, listElement1.getPropertyChangeListeners().length);
// install new listeners for the next bloomCount
for (int i = 0; i < bloomCount; i++)
list.add(listElement1);
assertEquals(initialListenerCount1 + 2 * bloomCount, listElement1.getPropertyChangeListeners().length);
final PropertyChangeListener[] propertyChangeListeners = listElement1.getPropertyChangeListeners();
// verify we have 2xbloomcount listeners
List listeners = new ArrayList();
Set uniqueListeners = new HashSet();
for (int i = 0; i < propertyChangeListeners.length; i++) {
if(!(propertyChangeListeners[i] instanceof BeanConnector.PropertyChangeHandler)) continue;
listeners.add(propertyChangeListeners[i]);
uniqueListeners.add(propertyChangeListeners[i]);
}
assertEquals(bloomCount * 2, listeners.size());
assertEquals(bloomCount + 1, uniqueListeners.size());
// install a completely new list element
final JLabel listElement2 = new JLabel();
final int initialListenerCount2 = listElement2.getPropertyChangeListeners().length;
list.add(listElement2);
assertEquals(initialListenerCount2 + 1, listElement2.getPropertyChangeListeners().length);
list.remove(listElement2);
assertEquals(initialListenerCount2, listElement2.getPropertyChangeListeners().length);
for (int i = 1; i < 2*bloomCount+1; i++) {
list.remove(0);
assertEquals(initialListenerCount1 + 2*bloomCount - i, listElement1.getPropertyChangeListeners().length);
}
}
public void testMultithreadedUpdate() throws InterruptedException {
final LazyThreadedConnector connector = new LazyThreadedConnector();
final ObservableElementList list = new ObservableElementList(new BasicEventList(), connector);
final JLabel listElement1 = new JLabel();
list.add(listElement1);
// this will pause half a second before notifying the list of the change
listElement1.setText("testing");
// attempt to modify the list before the notification is received
list.remove(0);
// get the Thread that was started by the connector
final Thread updateThread = connector.getLastUpdateThread();
// ensure the update thread is still running and thus the test is valid
assertTrue(updateThread.isAlive());
// wait until the update occurs
updateThread.join();
// ensure the update thread finished with no exception
assertEquals(false, connector.isExitDueToException());
}
public void testGenerics() {
// should be able to use an EventList and a Connector, for example
new ObservableElementList(new BasicEventList(), new ComponentConnector());
}
public void testSwitchToMultiListenerMode() {
final ObservableElementList list = new ObservableElementList(new BasicEventList(), new BurstOfThreeJLabelConnector());
// pattern of installed PropertyChangeListeners: _ _ _ A A A _ _ _ B B B
for (int i = 0; i < 12; i++)
list.add(new JLabel());
assertEquals(list.get(0).getPropertyChangeListeners().length, list.get(1).getPropertyChangeListeners().length);
assertEquals(list.get(1).getPropertyChangeListeners().length, list.get(2).getPropertyChangeListeners().length);
assertEquals(list.get(2).getPropertyChangeListeners().length+1, list.get(3).getPropertyChangeListeners().length);
assertEquals(list.get(3).getPropertyChangeListeners().length, list.get(4).getPropertyChangeListeners().length);
assertEquals(list.get(4).getPropertyChangeListeners().length, list.get(5).getPropertyChangeListeners().length);
assertEquals(list.get(5).getPropertyChangeListeners().length-1, list.get(6).getPropertyChangeListeners().length);
assertEquals(list.get(6).getPropertyChangeListeners().length, list.get(7).getPropertyChangeListeners().length);
assertEquals(list.get(7).getPropertyChangeListeners().length, list.get(8).getPropertyChangeListeners().length);
assertEquals(list.get(8).getPropertyChangeListeners().length+1, list.get(9).getPropertyChangeListeners().length);
assertEquals(list.get(9).getPropertyChangeListeners().length, list.get(10).getPropertyChangeListeners().length);
assertEquals(list.get(10).getPropertyChangeListeners().length, list.get(11).getPropertyChangeListeners().length);
list.dispose();
// all Labels should now have the same number of listeners
for (Iterator i = list.iterator(); i.hasNext();)
assertEquals(list.get(0).getPropertyChangeListeners().length, i.next().getPropertyChangeListeners().length);
}
/**
* This connector installs a common JavaBean listener on every element
* until bloomCount has been reached, when it begins installing unique
* listeners on each additional element.
*/
private class LateBloomingMultiEventListJLabelConnector extends MultiEventListJLabelConnector {
private int elementCount = 0;
private final int bloomCount;
public LateBloomingMultiEventListJLabelConnector(int bloomCount) {
super(false);
this.bloomCount = bloomCount;
}
public EventListener installListener(JLabel element) {
// install a common PropertyChangeListener until the bloomCount is reached
// and then begin installing unique PropertyChangeListeners
if (this.elementCount++ < this.bloomCount) {
element.addPropertyChangeListener(this.propertyChangeListener);
return this.propertyChangeListener;
}
return super.installListener(element);
}
}
/**
* This connector only installs JavaBean listeners on every second element
* that is added to the associated {@link ObservableElementList} if the picky
* flag is set to true.
*/
private class MultiEventListJLabelConnector extends BeanConnector {
private final boolean picky;
private int elementCount = 0;
public MultiEventListJLabelConnector(boolean picky) {
super(JLabel.class);
this.picky = picky;
}
public EventListener installListener(JLabel element) {
if (this.picky && this.elementCount++ % 2 == 0)
return null;
final PropertyChangeListener propertyChangeHandler = new PropertyChangeHandler();
element.addPropertyChangeListener(propertyChangeHandler);
return propertyChangeHandler;
}
public void uninstallListener(JLabel element, EventListener listener) {
element.removePropertyChangeListener((PropertyChangeListener) listener);
}
}
/**
* This connector installs a "pattern of PropertyChangeListeners" like this:
*
* _ _ _ X X X _ _ _ Y Y Y _ _ _ Z Z Z....
*
* where "_" denotes NO LISTENER INSTALLED, and X, Y, and Z denote different
* instances of PropertyChangeListeners.
*
* https://glazedlists.dev.java.net/issues/show_bug.cgi?id=452
*/
private class BurstOfThreeJLabelConnector extends BeanConnector {
private final int groupSize = 3;
private int currentGroupSize;
private PropertyChangeListener currentGroupListener = new PropertyChangeHandler();
public BurstOfThreeJLabelConnector() {
super(JLabel.class);
this.currentGroupSize = -groupSize;
}
public EventListener installListener(JLabel element) {
currentGroupSize++;
if (currentGroupSize > groupSize) {
currentGroupSize = -groupSize+1;
currentGroupListener = new PropertyChangeHandler();
}
if (currentGroupSize > 0 && currentGroupSize <= groupSize) {
element.addPropertyChangeListener(currentGroupListener);
return currentGroupListener;
}
return null;
}
public void uninstallListener(JLabel element, EventListener listener) {
element.removePropertyChangeListener((PropertyChangeListener) listener);
}
}
private static class ComponentConnector extends BeanConnector {
public ComponentConnector() {
super(Component.class);
}
}
/**
* This connector only installs JavaBean listeners on every second element
* that is added to the associated {@link ObservableElementList}.
*/
private static class PickyJLabelConnector extends BeanConnector {
private int elementCount = 0;
public PickyJLabelConnector() {
super(JLabel.class);
}
public EventListener installListener(JLabel element) {
if (this.elementCount++ % 2 == 0)
return null;
return super.installListener(element);
}
}
/**
* This connector only installs JavaBean listeners on every second element
* that is added to the associated {@link ObservableElementList}.
*/
private static class LazyThreadedConnector extends BeanConnector {
private Thread lastUpdateThread;
private boolean exitDueToException = false;
public LazyThreadedConnector() {
super(JLabel.class);
}
protected PropertyChangeListener createPropertyChangeListener() {
return new LazyThreadedPropertyChangeHandler();
}
public Thread getLastUpdateThread() {
return lastUpdateThread;
}
public boolean isExitDueToException() {
return exitDueToException;
}
/**
* The PropertyChangeListener which notifies the
* {@link ObservableElementList} within this Connector of changes to
* list elements.
*/
protected class LazyThreadedPropertyChangeHandler extends PropertyChangeHandler {
public void propertyChange(final PropertyChangeEvent event) {
// start another thread which, in half a second, will notify the list of the
// update (which allows us time to modify the list in our TestCase thread)
lastUpdateThread = new Thread(new DelayThenNotifyRunnable(event, this));
lastUpdateThread.start();
}
}
private class DelayThenNotifyRunnable implements Runnable {
private PropertyChangeEvent event;
private LazyThreadedPropertyChangeHandler handler;
public DelayThenNotifyRunnable(PropertyChangeEvent event, LazyThreadedPropertyChangeHandler handler) {
this.event = event;
this.handler = handler;
}
public void run() {
try {
// 1. delay
try {
Thread.sleep(500);
} catch (InterruptedException e) {}
// 2. notify the list of the change
handler.propertyChange(event);
} catch(Exception e) {
exitDueToException = true;
}
}
}
}
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