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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.
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/**
 *  Copyright Terracotta, Inc.
 *
 *  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.
 */

package net.sf.ehcache.util;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Set;

/**
 * Wraps a set to provide a list interface.
 * All list methods not application to set throws an {@link UnsupportedOperationException}
 *
 * @author Chris Dennis
 * @param 
 */
public class SetAsList implements List {

    private final Set set;
    private transient Object[] array;

    /**
     * @param set
     */
    public SetAsList(Set set) {
        this.set = set;
    }

    /**
     * {@inheritDoc}
     */
    public int size() {
        return set.size();
    }

    /**
     * {@inheritDoc}
     */
    public boolean isEmpty() {
        return set.isEmpty();
    }

    /**
     * {@inheritDoc}
     */
    public boolean contains(Object o) {
        return set.contains(o);
    }

    /**
     * {@inheritDoc}
     */
    public Iterator iterator() {
        return set.iterator();
    }

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

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

    /**
     * {@inheritDoc}
     */
    public boolean add(E e) {
        return set.add(e);
    }

    /**
     * {@inheritDoc}
     */
    public boolean remove(Object o) {
        return set.remove(o);
    }

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

    /**
     * {@inheritDoc}
     */
    public boolean addAll(Collection c) {
        return set.addAll(c);
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public boolean addAll(int index, Collection c) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

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

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

    /**
     * {@inheritDoc}
     */
    public void clear() {
        set.clear();
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     *
     * @param index Index
     */
    public E get(int index) {
        if (this.array == null) {
            this.array = toArray();
        }
        if (array.length <= index) {
            throw new IndexOutOfBoundsException();
        }
        return (E) this.array[index];
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public E set(int index, E element) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public void add(int index, E element) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public E remove(int index) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public int indexOf(Object o) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public int lastIndexOf(Object o) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public ListIterator listIterator() {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public ListIterator listIterator(int index) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }

    /**
     * Does not support List methods {@link UnsupportedOperationException}.
     */
    public List subList(int fromIndex, int toIndex) {
        throw new UnsupportedOperationException("Delegates to set, operation not supported");
    }
}