001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.record;
020
021import org.apache.hadoop.classification.InterfaceAudience;
022import org.apache.hadoop.classification.InterfaceStability;
023
024/**
025 * Interface that acts as an iterator for deserializing maps.
026 * The deserializer returns an instance that the record uses to
027 * read vectors and maps. An example of usage is as follows:
028 *
029 * <code>
030 * Index idx = startVector(...);
031 * while (!idx.done()) {
032 *   .... // read element of a vector
033 *   idx.incr();
034 * }
035 * </code>
036 * 
037 * @deprecated Replaced by <a href="https://hadoop.apache.org/avro/">Avro</a>.
038 */
039@Deprecated
040@InterfaceAudience.Public
041@InterfaceStability.Stable
042public interface Index {
043  boolean done();
044  void incr();
045}