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package com.xwzhou.commons.util;

import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

public class ConcurrentHashSet extends AbstractSet implements Set {
	private final ConcurrentHashMap _map = new ConcurrentHashMap();
	private transient Set _keys = _map.keySet();

	public ConcurrentHashSet() {
	}

	public boolean add(E e) {
		return _map.put(e, Boolean.TRUE) == null;
	}

	public void clear() {
		_map.clear();
	}

	public boolean contains(Object o) {
		return _map.containsKey(o);
	}

	public boolean containsAll(Collection c) {
		return _keys.containsAll(c);
	}

	public boolean equals(Object o) {
		return o == this || _keys.equals(o);
	}

	public int hashCode() {
		return _keys.hashCode();
	}

	public boolean isEmpty() {
		return _map.isEmpty();
	}

	public Iterator iterator() {
		return _keys.iterator();
	}

	public boolean remove(Object o) {
		return _map.remove(o) != null;
	}

	public boolean removeAll(Collection c) {
		return _keys.removeAll(c);
	}

	public boolean retainAll(Collection c) {
		return _keys.retainAll(c);
	}

	public int size() {
		return _map.size();
	}

	public Object[] toArray() {
		return _keys.toArray();
	}

	public  T[] toArray(T[] a) {
		return _keys.toArray(a);
	}

	public String toString() {
		return _keys.toString();
	}
}