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package net.apexes.commons.lang;

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

/**
 * @author hedyn
 */
public class ConcurrentHashSet extends AbstractSet implements Set, java.io.Serializable {

    private static final Object PRESENT = new Object();

    private final ConcurrentHashMap map;

    public ConcurrentHashSet(){
        map = new ConcurrentHashMap<>();
    }

    public ConcurrentHashSet(int initialCapacity){
        map = new ConcurrentHashMap<>(initialCapacity);
    }

    @Override
    public Iterator iterator() {
        return map.keySet().iterator();
    }

    @Override
    public int size() {
        return map.size();
    }

    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return map.containsKey(o);
    }

    @Override
    public boolean add(E e) {
        return map.put(e, PRESENT) == null;
    }

    @Override
    public boolean remove(Object o) {
        return map.remove(o) == PRESENT;
    }

    @Override
    public void clear() {
        map.clear();
    }
}