1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.hadoop.record; 20 21 /** 22 * Interface that acts as an iterator for deserializing maps. 23 * The deserializer returns an instance that the record uses to 24 * read vectors and maps. An example of usage is as follows: 25 * 26 * <code> 27 * Index idx = startVector(...); 28 * while (!idx.done()) { 29 * .... // read element of a vector 30 * idx.incr(); 31 * } 32 * </code> 33 */ 34 public interface Index { done()35 boolean done(); incr()36 void incr(); 37 } 38