/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces.demo.iteration;
import java.io.Serializable;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
import org.richfaces.log.LogFactory;
import org.richfaces.log.Logger;
import com.google.common.collect.ForwardingIterator;
import com.google.common.collect.ForwardingSet;
/**
* @author Nick Belaevski
*
*/
public class TracingSet<E> extends ForwardingSet<E> implements Serializable {
private static final long serialVersionUID = 267329344963751893L;
private static final Logger LOGGER = LogFactory.getLogger(TracingSet.class);
private class TracingIterator extends ForwardingIterator<E> {
private final Iterator<E> itr = backingCollection.iterator();
private E lastObject;
@Override
protected Iterator<E> delegate() {
return itr;
}
@Override
public E next() {
try {
lastObject = super.next();
return lastObject;
} catch (NoSuchElementException e) {
lastObject = null;
throw e;
}
}
@Override
public void remove() {
LOGGER.info("TracingSet.TracingIterator.remove() " + lastObject);
super.remove();
}
}
private Set<E> backingCollection = new HashSet<E>();
@Override
protected Set<E> delegate() {
return backingCollection;
}
@Override
public boolean removeAll(Collection<?> collection) {
LOGGER.info("TracingSet.removeAll() " + collection);
return super.removeAll(collection);
}
@Override
public boolean add(E element) {
LOGGER.info("TracingSet.add() " + element);
return super.add(element);
}
@Override
public boolean remove(Object object) {
LOGGER.info("TracingSet.remove() " + object);
return super.remove(object);
}
@Override
public boolean addAll(Collection<? extends E> collection) {
LOGGER.info("TracingSet.addAll() " + collection);
return super.addAll(collection);
}
@Override
public void clear() {
LOGGER.info("TracingSet.clear()");
super.clear();
}
@Override
public Iterator<E> iterator() {
return new TracingIterator();
}
}