oak-store-document/src/main/java/org/apache/jackrabbit/oak/plugins/document/util/CloseableIterator.java

/*
 * 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.oak.plugins.document.util;

import java.io.Closeable;
import java.io.IOException;
import java.util.Iterator;

public class CloseableIterator<T> implements Iterator<T>, Closeable {
    private final Iterator<T> iterator;
    private final Closeable closeable;

    public static <T> CloseableIterator<T> wrap(Iterator<T> iterator, Closeable closeable) {
        return new CloseableIterator<T>(iterator, closeable);
    }

    public static <T> CloseableIterator<T> wrap(Iterator<T> iterator) {
        return new CloseableIterator<T>(iterator, null);
    }

    public CloseableIterator(Iterator<T> iterable, Closeable closeable) {
        this.iterator = iterable;
        this.closeable = closeable;
    }

    @Override
    public void close() throws IOException {
        if (closeable != null) {
            closeable.close();
        }
    }

    @Override
    public boolean hasNext() {
        return iterator.hasNext();
    }

    @Override
    public void remove() {
        iterator.remove();
    }

    @Override
    public T next() {
        return iterator.next();
    }
}