ListToSet.java example

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2012, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.weld.util.collections;

import java.util.AbstractSet;
import java.util.Iterator;
import java.util.List;

/**
 * Provides a set-like read-only view on a given {@link List}. Modification of the underlying list is not supported.
 * @author Jozef Hartinger
 *
 */
public abstract class ListToSet<T> extends AbstractSet<T> {

    protected abstract List<T> delegate();

    @Override
    public Iterator<T> iterator() {
        return delegate().iterator();
    }

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