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 */ 018 019 package org.apache.hadoop.mapred.lib.aggregate; 020 021 import org.apache.hadoop.classification.InterfaceAudience; 022 import org.apache.hadoop.classification.InterfaceStability; 023 import org.apache.hadoop.mapred.JobConf; 024 025 /** 026 * This class implements a wrapper for a user defined value aggregator descriptor. 027 * It servs two functions: One is to create an object of ValueAggregatorDescriptor from the 028 * name of a user defined class that may be dynamically loaded. The other is to 029 * deligate inviokations of generateKeyValPairs function to the created object. 030 * 031 * @deprecated Use 032 * {@link org.apache.hadoop.mapreduce.lib.aggregate.UserDefinedValueAggregatorDescriptor} 033 * instead 034 */ 035 @Deprecated 036 @InterfaceAudience.Public 037 @InterfaceStability.Stable 038 public class UserDefinedValueAggregatorDescriptor extends org.apache.hadoop. 039 mapreduce.lib.aggregate.UserDefinedValueAggregatorDescriptor 040 implements ValueAggregatorDescriptor { 041 042 /** 043 * Create an instance of the given class 044 * @param className the name of the class 045 * @return a dynamically created instance of the given class 046 */ 047 public static Object createInstance(String className) { 048 return org.apache.hadoop.mapreduce.lib.aggregate. 049 UserDefinedValueAggregatorDescriptor.createInstance(className); 050 } 051 052 /** 053 * 054 * @param className the class name of the user defined descriptor class 055 * @param job a configure object used for decriptor configuration 056 */ 057 public UserDefinedValueAggregatorDescriptor(String className, JobConf job) { 058 super(className, job); 059 ((ValueAggregatorDescriptor)theAggregatorDescriptor).configure(job); 060 } 061 062 /** 063 * Do nothing. 064 */ 065 public void configure(JobConf job) { 066 067 } 068 069 }