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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
public class ConcurrentHashSet<E> extends AbstractSet<E> implements Set<E>
{
private final Map<E, Boolean> _map = new ConcurrentHashMap<E, Boolean>();
private transient Set<E> _keys = _map.keySet();
public ConcurrentHashSet()
{
}
@Override
public boolean add(E e)
{
return _map.put(e,Boolean.TRUE) == null;
}
@Override
public void clear()
{
_map.clear();
}
@Override
public boolean contains(Object o)
{
return _map.containsKey(o);
}
@Override
public boolean containsAll(Collection<?> c)
{
return _keys.containsAll(c);
}
@Override
public boolean equals(Object o)
{
return o == this || _keys.equals(o);
}
@Override
public int hashCode()
{
return _keys.hashCode();
}
@Override
public boolean isEmpty()
{
return _map.isEmpty();
}
@Override
public Iterator<E> iterator()
{
return _keys.iterator();
}
@Override
public boolean remove(Object o)
{
return _map.remove(o) != null;
}
@Override
public boolean removeAll(Collection<?> c)
{
return _keys.removeAll(c);
}
@Override
public boolean retainAll(Collection<?> c)
{
return _keys.retainAll(c);
}
@Override
public int size()
{
return _map.size();
}
@Override
public Object[] toArray()
{
return _keys.toArray();
}
@Override
public <T> T[] toArray(T[] a)
{
return _keys.toArray(a);
}
@Override
public String toString()
{
return _keys.toString();
}
}
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