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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.

There is a newer version: 4.5.0-M1

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.commons.collections4.set;

import java.util.Set;

import org.apache.commons.collections4.collection.AbstractCollectionDecorator;

/**
 * Decorates another Set to provide additional behaviour.
 * 
 * Methods are forwarded directly to the decorated set.
 *
 * @param  the type of the elements in this set
 * @since 3.0
 */
public abstract class AbstractSetDecorator extends AbstractCollectionDecorator implements
        Set {

    /** Serialization version */
    private static final long serialVersionUID = -4678668309576958546L;

    /**
     * Constructor only used in deserialization, do not use otherwise.
     * @since 3.1
     */
    protected AbstractSetDecorator() {
        super();
    }

    /**
     * Constructor that wraps (not copies).
     *
     * @param set  the set to decorate, must not be null
     * @throws NullPointerException if set is null
     */
    protected AbstractSetDecorator(final Set set) {
        super(set);
    }

    /**
     * Gets the set being decorated.
     *
     * @return the decorated set
     */
    @Override
    protected Set decorated() {
        return (Set) super.decorated();
    }

    @Override
    public boolean equals(final Object object) {
        return object == this || decorated().equals(object);
    }

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

}