org.javimmutable.collections.common.SetAdaptor Maven / Gradle / Ivy

Go to download
///###////////////////////////////////////////////////////////////////////////
//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2017, Burton Computer Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//
//     Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in
//     the documentation and/or other materials provided with the
//     distribution.
//
//     Neither the name of the Burton Computer Corporation nor the names
//     of its contributors may be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package org.javimmutable.collections.common;

import org.javimmutable.collections.JImmutableSet;

import javax.annotation.concurrent.Immutable;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;

/**
 * Adaptor that implements an unmodifiable Set backed by a JImmutableSet.
 *
 * @param 
 */
@Immutable
public class SetAdaptor
        extends AbstractSet
{
    private final JImmutableSet pset;

    public SetAdaptor(JImmutableSet pset)
    {
        this.pset = pset;
    }

    public static  SetAdaptor of(JImmutableSet pset)
    {
        return new SetAdaptor(pset);
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean contains(Object o)
    {
        return pset.contains((T)o);
    }

    @Override
    public boolean containsAll(Collection objects)
    {
        for (Object o : objects) {
            if (!contains(o)) {
                return false;
            }
        }
        return true;
    }

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

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

    public static  boolean areEqual(Set a,
                                       Set b)
    {
        if (a == null) {
            return b == null;
        } else if (b == null) {
            return false;
        }
        if (a.size() != b.size()) {
            return false;
        }
        for (T value : a) {
            if (!b.contains(value)) {
                return false;
            }
        }
        return true;
    }
}