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/* *************************************************************************
IT Mill Toolkit
Development of Browser User Intarfaces Made Easy
Copyright (C) 2000-2006 IT Mill Ltd
*************************************************************************
This product is distributed under commercial license that can be found
from the product package on license/license.txt. Use of this product might
require purchasing a commercial license from IT Mill Ltd. For guidelines
on usage, see license/licensing-guidelines.html
*************************************************************************
For more information, contact:
IT Mill Ltd phone: +358 2 4802 7180
Ruukinkatu 2-4 fax: +358 2 4802 7181
20540, Turku email: info@itmill.com
Finland company www: www.itmill.com
Primary source for information and releases: www.itmill.com
********************************************************************** */
package com.itmill.toolkit.event;
import java.util.EventObject;
import java.util.LinkedList;
import java.util.Iterator;
import java.lang.reflect.Method;
/** Event router class implementing the MillStone 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 LinkedList 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 LinkedList();
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 LinkedList();
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) {
Iterator i = listenerList.iterator();
while (i.hasNext()) {
try {
ListenerMethod lm = (ListenerMethod) i.next();
if (lm.matches(eventType,target))
i.remove();
} catch (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) {
Iterator i = listenerList.iterator();
while (i.hasNext()) {
try {
ListenerMethod lm = (ListenerMethod) i.next();
if (lm.matches(eventType,target,method))
i.remove();
} catch (java.lang.ClassCastException e) {
// Class cast exceptions are ignored
}
}
}
}
/* Removes the event listener method 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, String methodName) {
// Find the correct method
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) {
Iterator i = listenerList.iterator();
while (i.hasNext()) {
try {
ListenerMethod lm = (ListenerMethod) i.next();
if (lm.matches(eventType,target,method))
i.remove();
} catch (java.lang.ClassCastException e) {
// Class cast exceptions are ignored
}
}
}
}
/** Remove all listeners from event router */
public void removeAllListeners() {
listenerList = null;
}
/** Send an event to all registered listeners. The listeners will decide
* if the activation method should be called or not.
*
* @param event 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.
Iterator i = new LinkedList(listenerList).iterator();
while(i.hasNext()) ((ListenerMethod)i.next()).receiveEvent(event);
}
}
}
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