content: /*
   * Copyright 2020 The Apache Software Foundation.
   *
   * 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.apache.bookkeeper.client.api;
  
  import java.io.IOException;
  
  /**
   * Iterator for ledgers.
   */
  public interface LedgersIterator {
  
      /**
       * Return true if there is at least one ledger to visit.
       *
       * @return true if there is at least one ledger to visit.
       * @throws IOException thrown when there is a problem accessing the ledger metadata store.
       */
      boolean hasNext() throws IOException;
  
      /**
       * Return next ledger id.
       *
       * @return next ledger id.
       * @throws IOException thrown when there is a problem accessing the ledger metadata store.
       */
      long next() throws IOException;
  
  }
  