Attachment 118060 Details for Bug 255534 – Replacement for the draw2d EventListenerList

Replacement for the draw2d EventListenerList

EventListenerList.java (text/x-java), 2.05 KB, created by Iwan Birrer

on 2008-11-17 11:28:09 EST

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Filename:

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Creator: Iwan Birrer

Created: 2008-11-17 11:28:09 EST

Size: 2.05 KB

patch

obsolete

>package org.eclipse.draw2d;
>
>import java.util.ArrayList;
>import java.util.Collections;
>import java.util.HashMap;
>import java.util.Iterator;
>import java.util.List;
>import java.util.Map;
>
>/**
> * This class is intended for internal use only. TODO: If this is for internal
> * use only, we should move it to the internal package.
> */
>public final class EventListenerList {
>
>	private final Map listenersMap = new HashMap();
>
>	/**
>	 * Adds a listener of type c to the list.
>	 * 
>	 * @param c
>	 * the class
>	 * @param listener
>	 * the listener
>	 */
>	public synchronized void addListener(Class c, Object listener) {
>		if (listener == null || c == null) {
>			throw new IllegalArgumentException();
>		}
>
>		List listeners = (List) listenersMap.get(c);
>		if (listeners == null) {
>			listeners = new ArrayList(2);
>			listenersMap.put(c, listeners);
>		}
>
>		listeners.add(listener);
>	}
>
>	/**
>	 * Returns <code>true</code> if this list of listeners contains a listener
>	 * of type c.
>	 * 
>	 * @param c
>	 * the type
>	 * @return whether this list contains a listener of type c
>	 */
>	public synchronized boolean containsListener(Class c) {
>		return listenersMap.containsKey(c);
>	}
>
>	/**
>	 * Returns an Iterator of all the listeners of type c.
>	 * 
>	 * @param listenerType
>	 * the type
>	 * @return an Iterator of all the listeners of type c
>	 */
>	public synchronized Iterator getListeners(final Class listenerType) {
>		if (listenersMap.get(listenerType) != null) {
>			return new ArrayList(((List) listenersMap.get(listenerType)))
>					.iterator();
>		}
>		return Collections.EMPTY_LIST.iterator();
>	}
>
>	/**
>	 * Removes the first listener of the specified type by identity.
>	 * 
>	 * @param c
>	 * the type
>	 * @param listener
>	 * the listener
>	 */
>	public synchronized void removeListener(Class c, Object listener) {
>		if (listener == null || c == null) {
>			throw new IllegalArgumentException();
>		}
>
>		List listeners = (List) listenersMap.get(c);
>		if (listeners != null) {
>			listeners.remove(listener);
>		}
>	}
>
>}

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Attachments on bug 255534: 118060 | 118061 | 159408