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/*
@ITMillApache2LicenseForJavaFiles@
*/
package com.itmill.toolkit.event;
import java.lang.reflect.Method;
import java.util.EventObject;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* <code>EventRouter</code> class implementing the inheritable event listening
* model. For more information on the event model see the
* {@link com.itmill.toolkit.event package documentation}.
*
* @author IT Mill Ltd.
* @version
* @VERSION@
* @since 3.0
*/
public class EventRouter implements MethodEventSource {
/**
* List of registered listeners.
*/
private Set listenerList = null;
/*
* Registers a new listener with the specified activation method to listen
* events generated by this component. Don't add a JavaDoc comment here, we
* use the default documentation from implemented interface.
*/
public void addListener(Class eventType, Object object, Method method) {
if (listenerList == null) {
listenerList = new LinkedHashSet();
}
listenerList.add(new ListenerMethod(eventType, object, method));
}
/*
* Registers a new listener with the specified named activation method to
* listen events generated by this component. Don't add a JavaDoc comment
* here, we use the default documentation from implemented interface.
*/
public void addListener(Class eventType, Object object, String methodName) {
if (listenerList == null) {
listenerList = new LinkedHashSet();
}
listenerList.add(new ListenerMethod(eventType, object, methodName));
}
/*
* Removes all registered listeners matching the given parameters. Don't add
* a JavaDoc comment here, we use the default documentation from implemented
* interface.
*/
public void removeListener(Class eventType, Object target) {
if (listenerList != null) {
final Iterator i = listenerList.iterator();
while (i.hasNext()) {
try {
final ListenerMethod lm = (ListenerMethod) i.next();
if (lm.matches(eventType, target)) {
i.remove();
return;
}
} catch (final java.lang.ClassCastException e) {
// Class cast exceptions are ignored
}
}
}
}
/*
* Removes the event listener methods matching the given given paramaters.
* Don't add a JavaDoc comment here, we use the default documentation from
* implemented interface.
*/
public void removeListener(Class eventType, Object target, Method method) {
if (listenerList != null) {
final Iterator i = listenerList.iterator();
while (i.hasNext()) {
try {
final ListenerMethod lm = (ListenerMethod) i.next();
if (lm.matches(eventType, target, method)) {
i.remove();
return;
}
} catch (final java.lang.ClassCastException e) {
// Class cast exceptions are ignored
}
}
}
}
/*
* Removes the event listener method matching the given given parameters.
* Don't add a JavaDoc comment here, we use the default documentation from
* implemented interface.
*/
public void removeListener(Class eventType, Object target, String methodName) {
// Find the correct method
final Method[] methods = target.getClass().getMethods();
Method method = null;
for (int i = 0; i < methods.length; i++) {
if (methods[i].getName().equals(methodName)) {
method = methods[i];
}
}
if (method == null) {
throw new IllegalArgumentException();
}
// Remove the listeners
if (listenerList != null) {
final Iterator i = listenerList.iterator();
while (i.hasNext()) {
try {
final ListenerMethod lm = (ListenerMethod) i.next();
if (lm.matches(eventType, target, method)) {
i.remove();
return;
}
} catch (final java.lang.ClassCastException e) {
// Class cast exceptions are ignored
}
}
}
}
/**
* Removes all listeners from event router.
*/
public void removeAllListeners() {
listenerList = null;
}
/**
* Sends an event to all registered listeners. The listeners will decide if
* the activation method should be called or not.
*
* @param event
* the Event to be sent to all listeners.
*/
public void fireEvent(EventObject event) {
// It is not necessary to send any events if there are no listeners
if (listenerList != null) {
// Send the event to all listeners. The listeners themselves
// will filter out unwanted events.
final Iterator i = listenerList.iterator();
while (i.hasNext()) {
((ListenerMethod) i.next()).receiveEvent(event);
}
}
}
}
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