| /* |
| * Copyright (c) 2008, 2009, 2011, 2012, 2015, 2019 Eike Stepper (Loehne, Germany) and others. |
| * 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: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.net4j.util.container.delegate; |
| |
| import org.eclipse.net4j.util.container.ContainerEvent; |
| import org.eclipse.net4j.util.container.IContainer; |
| import org.eclipse.net4j.util.container.IContainerDelta; |
| import org.eclipse.net4j.util.container.IContainerDelta.Kind; |
| import org.eclipse.net4j.util.container.SingleDeltaContainerEvent; |
| import org.eclipse.net4j.util.event.IListener; |
| import org.eclipse.net4j.util.event.Notifier; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| /** |
| * A delegating base class for {@link IContainer containers}. |
| * |
| * @author Eike Stepper |
| */ |
| public abstract class AbstractDelegator<E> extends Notifier implements IContainer<E> |
| { |
| public AbstractDelegator() |
| { |
| } |
| |
| protected void fireAddedEvent(E o) |
| { |
| IListener[] listeners = getListeners(); |
| if (listeners != null) |
| { |
| fireEvent(new SingleDeltaContainerEvent<E>(this, o, IContainerDelta.Kind.ADDED), listeners); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected void fireRemovedEvent(Object o) |
| { |
| IListener[] listeners = getListeners(); |
| if (listeners != null) |
| { |
| fireEvent(new SingleDeltaContainerEvent<E>(this, (E)o, IContainerDelta.Kind.REMOVED), listeners); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected ContainerEvent<E> createEvent(Collection<? super E> c, Kind kind) |
| { |
| ContainerEvent<E> event = new ContainerEvent<E>(this); |
| for (Object o : c) |
| { |
| event.addDelta((E)o, kind); |
| } |
| |
| return event; |
| } |
| |
| protected boolean dispatchEvent(ContainerEvent<E> event) |
| { |
| if (event.isEmpty()) |
| { |
| return false; |
| } |
| |
| IListener[] listeners = getListeners(); |
| if (listeners != null) |
| { |
| fireEvent(event, listeners); |
| } |
| |
| return true; |
| } |
| |
| /** |
| * A delegating {@link Iterator iterator}. |
| * |
| * @author Eike Stepper |
| */ |
| public class DelegatingIterator implements Iterator<E> |
| { |
| private Iterator<E> delegate; |
| |
| protected E last; |
| |
| public DelegatingIterator(Iterator<E> delegate) |
| { |
| this.delegate = delegate; |
| } |
| |
| public Iterator<E> getDelegate() |
| { |
| return delegate; |
| } |
| |
| /** |
| * @category READ |
| */ |
| public boolean hasNext() |
| { |
| return getDelegate().hasNext(); |
| } |
| |
| /** |
| * @category READ |
| */ |
| public E next() |
| { |
| return last = getDelegate().next(); |
| } |
| |
| /** |
| * @category WRITE |
| */ |
| public void remove() |
| { |
| getDelegate().remove(); |
| fireRemovedEvent(last); |
| last = null; |
| } |
| } |
| } |