diff options
Diffstat (limited to 'common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/ListenerList.java')
-rw-r--r-- | common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/ListenerList.java | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/ListenerList.java b/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/ListenerList.java deleted file mode 100644 index 6161fb00c9..0000000000 --- a/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/ListenerList.java +++ /dev/null @@ -1,171 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2008, 2012 Oracle. All rights reserved. - * This program and the accompanying materials are made available under the - * terms of the Eclipse Public License v1.0, which accompanies this distribution - * and is available at http://www.eclipse.org/legal/epl-v10.html. - * - * Contributors: - * Oracle - initial API and implementation - ******************************************************************************/ -package org.eclipse.jpt.common.utility.internal; - -import java.io.IOException; -import java.io.ObjectInputStream; -import java.io.ObjectOutputStream; -import java.io.Serializable; -import java.lang.reflect.Array; -import java.util.Arrays; - -import org.eclipse.jpt.common.utility.internal.iterables.ArrayIterable; - -/** - * Maintain a thread-safe list of listeners that does not allow adding - * duplicate listeners or removing non-listeners. - * - * @parm <L> the type of listeners held by the list - */ -public class ListenerList<L> - implements Serializable -{ - /** - * We can mark this <code>volatile</code> and not synchronize the read - * methods because we never change the <em>contents</em> of the array. - */ - private transient volatile L[] listeners; - - private static final long serialVersionUID = 1L; - - - /** - * Construct a listener list for listeners of the specified type. - */ - public ListenerList(Class<L> listenerClass) { - super(); - this.listeners = this.buildListenerArray(listenerClass, 0); - } - - /** - * Construct a listener list for listeners of the specified type. - * Add the specified listener to the list. - */ - public ListenerList(Class<L> listenerClass, L listener) { - super(); - if (listener == null) { - throw new NullPointerException(); - } - this.listeners = this.buildListenerArray(listenerClass, 1); - this.listeners[0] = listener; - } - - @SuppressWarnings("unchecked") - private L[] buildListenerArray(Class<L> listenerClass, int length) { - return (L[]) Array.newInstance(listenerClass, length); - } - - /** - * Return the listeners. - */ - public Iterable<L> getListeners() { - return new ArrayIterable<L>(this.listeners); - } - - /** - * Return the number of listeners. - */ - public int size() { - return this.listeners.length; - } - - /** - * Return whether the listener list has no listeners. - */ - public boolean isEmpty() { - return this.listeners.length == 0; - } - - /** - * Add the specified listener to the listener list. - * Duplicate listeners are not allowed. - */ - public synchronized void add(L listener) { - if (listener == null) { - throw new NullPointerException(); - } - if (ArrayTools.contains(this.listeners, listener)) { - throw new IllegalArgumentException("duplicate listener: " + listener); //$NON-NLS-1$ - } - this.listeners = ArrayTools.add(this.listeners, listener); - } - - /** - * Remove the specified listener from the listener list. - * Removing a listener that is not on the list is not allowed. - */ - public synchronized void remove(L listener) { - if (listener == null) { - throw new NullPointerException(); - } - int index = ArrayTools.indexOf(this.listeners, listener); - if (index == -1) { - throw new IllegalArgumentException("unregistered listener: " + listener); //$NON-NLS-1$ - } - this.listeners = ArrayTools.removeElementAtIndex(this.listeners, index); - } - - /** - * Clear the listener list. - */ - public synchronized void clear() { - this.listeners = ArrayTools.clear(this.listeners); - } - - /** - * Return the type of listeners held by the listener list. - */ - @SuppressWarnings("unchecked") - public Class<L> getListenerType() { - return (Class<L>) this.listeners.getClass().getComponentType(); - } - - @Override - public String toString() { - return Arrays.toString(this.listeners); - } - - - // ********** serialization ********** - - /** - * Silently drop any non-serializable listeners. - */ - private synchronized void writeObject(ObjectOutputStream s) throws IOException { - // write out any hidden stuff - s.defaultWriteObject(); - - @SuppressWarnings("unchecked") - Class<L> listenerClass = (Class<L>) this.listeners.getClass().getComponentType(); - s.writeObject(listenerClass); - - // only write out serializable listeners - for (L listener : this.listeners) { - if (listener instanceof Serializable) { - s.writeObject(listener); - } - } - - s.writeObject(null); - } - - @SuppressWarnings("unchecked") - private void readObject(ObjectInputStream s) throws ClassNotFoundException, IOException { - // read in any hidden stuff - s.defaultReadObject(); - - Class<L> listenerClass = (Class<L>) s.readObject(); - this.listeners = this.buildListenerArray(listenerClass, 0); - Object o; - while ((o = s.readObject()) != null) { - this.listeners = ArrayTools.add(this.listeners, (L) o); - } - } -} |