diff options
Diffstat (limited to 'plugins/org.eclipse.net4j/src/org/eclipse/internal/net4j/util/container/delegate/AbstractDelegator.java')
-rw-r--r-- | plugins/org.eclipse.net4j/src/org/eclipse/internal/net4j/util/container/delegate/AbstractDelegator.java | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/plugins/org.eclipse.net4j/src/org/eclipse/internal/net4j/util/container/delegate/AbstractDelegator.java b/plugins/org.eclipse.net4j/src/org/eclipse/internal/net4j/util/container/delegate/AbstractDelegator.java new file mode 100644 index 0000000000..87f7a51a09 --- /dev/null +++ b/plugins/org.eclipse.net4j/src/org/eclipse/internal/net4j/util/container/delegate/AbstractDelegator.java @@ -0,0 +1,110 @@ +/*************************************************************************** + * Copyright (c) 2004-2007 Eike Stepper, Germany. + * 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.internal.net4j.util.container.delegate; + +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.internal.net4j.util.container.ContainerEvent; +import org.eclipse.internal.net4j.util.container.SingleDeltaContainerEvent; +import org.eclipse.internal.net4j.util.event.Notifier; + +import java.util.Collection; +import java.util.Iterator; + +/** + * @author Eike Stepper + */ +public abstract class AbstractDelegator<E> extends Notifier implements IContainer<E> +{ + public AbstractDelegator() + { + } + + protected void fireAddedEvent(E o) + { + fireEvent(new SingleDeltaContainerEvent(this, o, IContainerDelta.Kind.ADDED)); + } + + protected void fireRemovedEvent(Object o) + { + fireEvent(new SingleDeltaContainerEvent(this, o, IContainerDelta.Kind.REMOVED)); + } + + protected ContainerEvent createEvent(Collection c, Kind kind) + { + ContainerEvent event = new ContainerEvent(this); + for (Object o : c) + { + event.addDelta(o, kind); + } + + return event; + } + + protected boolean dispatchEvent(ContainerEvent event) + { + if (event.isEmpty()) + { + return false; + } + + fireEvent(event); + return true; + } + + /** + * @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; + } + } +} |