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Implementation of the LDP4j Application Kernel
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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the LDP4j Project:
 *     http://www.ldp4j.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2014-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *             http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.ldp4j.framework:ldp4j-application-kernel-core:0.2.2
 *   Bundle      : ldp4j-application-kernel-core-0.2.2.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.ldp4j.application.kernel.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 final class ConcurrentHashSet extends AbstractSet implements Set {

	private final Map valueMap = new ConcurrentHashMap();
	private Set values = valueMap.keySet();

	public ConcurrentHashSet() {
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean add(E e) {
		return this.valueMap.put(e, Boolean.TRUE) == null;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean remove(Object o) {
		return this.valueMap.remove(o) != null;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void clear() {
		this.valueMap.clear();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean contains(Object o) {
		return this.valueMap.containsKey(o);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean isEmpty() {
		return this.valueMap.isEmpty();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public int size() {
		return this.valueMap.size();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean containsAll(Collection c) {
		return this.values.containsAll(c);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean equals(Object o) {
		return o == this || this.values.equals(o);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public int hashCode() {
		return this.values.hashCode();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Iterator iterator() {
		return this.values.iterator();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean removeAll(Collection c) {
		return this.values.removeAll(c);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean retainAll(Collection c) {
		return this.values.retainAll(c);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Object[] toArray() {
		return this.values.toArray();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public  T[] toArray(T[] a) {
		return this.values.toArray(a);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String toString() {
		return this.values.toString();
	}

}