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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.pulsar.metadata.bookkeeper;

import java.io.IOException;
import org.apache.bookkeeper.meta.LedgerManager;

public class CombinedLedgerRangeIterator implements LedgerManager.LedgerRangeIterator {
    private final LedgerManager.LedgerRangeIterator iteratorA;
    private final LedgerManager.LedgerRangeIterator iteratorB;

    CombinedLedgerRangeIterator(LedgerManager.LedgerRangeIterator iteratorA,
                                    LedgerManager.LedgerRangeIterator iteratorB) {
        this.iteratorA = iteratorA;
        this.iteratorB = iteratorB;
    }

    @Override
    public boolean hasNext() throws IOException {
        return iteratorA.hasNext() || iteratorB.hasNext();
    }

    @Override
    public LedgerManager.LedgerRange next() throws IOException {
        if (iteratorA.hasNext()) {
            return iteratorA.next();
        }
        return iteratorB.next();
    }
}