/*
 * 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.Node;
import javax.jcr.NodeIterator;
import javax.jcr.RepositoryException;
import javax.jcr.version.VersionIterator;

import javax.jcr.version.Version;

/**
 * Implements a node iterator that takes a version iterator and returns the
 * frozen nodes of the underlying versions.
 */
public class FrozenNodeIteratorAdapter extends RangeIteratorAdapter implements NodeIterator {

    public FrozenNodeIteratorAdapter(VersionIterator iterator) {
        super(iterator);
    }

    /**
     * {@inheritDoc}
     *
     * @return the next frozen node.
     */
    public Node nextNode() {
        try {
            return ((Version) next()).getFrozenNode();
        } catch (RepositoryException e) {
            throw (IllegalStateException) new IllegalStateException(e.toString()).initCause(e);
        }
    }
}