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/*
 * 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.jackrabbit.commons.iterator;

import javax.jcr.RangeIterator;
import javax.jcr.security.AccessControlPolicy;
import javax.jcr.security.AccessControlPolicyIterator;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Adapter class for turning {@link RangeIterator}s or {@link Iterator}s
 * into {@link AccessControlPolicyIteratorAdapter}s.
 */
public class AccessControlPolicyIteratorAdapter extends RangeIteratorDecorator
        implements AccessControlPolicyIterator {

    /**
     * Static instance of an empty {@link AccessControlPolicyIteratorAdapter}.
     */
    public static final AccessControlPolicyIterator EMPTY =
        new AccessControlPolicyIteratorAdapter(RangeIteratorAdapter.EMPTY);

    /**
     * Creates an adapter for the given {@link RangeIterator}.
     *
     * @param iterator iterator of {@link AccessControlPolicy access control policies}.
     */
    public AccessControlPolicyIteratorAdapter(RangeIterator iterator) {
        super(iterator);
    }

    /**
     * Creates an adapter for the given {@link Iterator}.
     *
     * @param iterator iterator of {@link AccessControlPolicy access control policies}.
     */
    public AccessControlPolicyIteratorAdapter(Iterator iterator) {
        super(new RangeIteratorAdapter(iterator));
    }

    /**
     * Creates an iterator for the given collection.
     *
     * @param collection collection of {@link AccessControlPolicy} objects.
     */
    public AccessControlPolicyIteratorAdapter(Collection collection) {
        super(new RangeIteratorAdapter(collection));
    }

    //----------------------------------------< AccessControlPolicyIterator >---
    /**
     * Returns the next policy.
     *
     * @return next policy.
     * @throws NoSuchElementException if there is no next policy.
     */
    public AccessControlPolicy nextAccessControlPolicy() throws NoSuchElementException {
        return (AccessControlPolicy) next();
    }
}