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jsync.io is a non-blocking, event-driven networking framework for Java

There is a newer version: 1.10.13

/*
 * Copyright (c) 2011-2013 The original author or authors
 * ------------------------------------------------------
 * 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 io.jsync.shareddata.impl;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * @author Tim Fox
 */
public class SharedSet implements Set {

    private static final Object O = "wibble";
    private final Map map = new SharedMap<>();

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

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

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

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

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

    public  T[] toArray(T[] ts) {
        return map.keySet().toArray(ts);
    }

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

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

    public boolean containsAll(Collection objects) {
        return map.keySet().containsAll(objects);
    }

    public boolean addAll(Collection es) {
        for (E e : es) {
            map.put(e, O);
        }
        return true;
    }

    public boolean retainAll(Collection objects) {
        return false;
    }

    public boolean removeAll(Collection objects) {
        boolean removed = false;
        for (Object obj : objects) {
            if (map.remove(obj) != null) {
                removed = true;
            }
        }
        return removed;
    }

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

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

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