001/* 002 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved. 003 * 004 * Project and contact information: http://www.cascading.org/ 005 * 006 * This file is part of the Cascading project. 007 * 008 * Licensed under the Apache License, Version 2.0 (the "License"); 009 * you may not use this file except in compliance with the License. 010 * You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, software 015 * distributed under the License is distributed on an "AS IS" BASIS, 016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 017 * See the License for the specific language governing permissions and 018 * limitations under the License. 019 */ 020 021package cascading.flow.hadoop; 022 023import cascading.property.ConfigDef; 024import org.apache.hadoop.conf.Configuration; 025 026/** 027* 028*/ 029public class ConfigurationSetter implements ConfigDef.Setter 030 { 031 private final Configuration conf; 032 033 public ConfigurationSetter( Configuration conf ) 034 { 035 this.conf = conf; 036 } 037 038 @Override 039 public String set( String key, String value ) 040 { 041 String oldValue = get( key ); 042 043 conf.set( key, value ); 044 045 return oldValue; 046 } 047 048 @Override 049 public String update( String key, String value ) 050 { 051 String oldValue = get( key ); 052 053 if( oldValue == null ) 054 conf.set( key, value ); 055 else if( !oldValue.contains( value ) ) 056 conf.set( key, oldValue + "," + value ); 057 058 return oldValue; 059 } 060 061 @Override 062 public String get( String key ) 063 { 064 String value = conf.get( key ); 065 066 if( value == null || value.isEmpty() ) 067 return null; 068 069 return value; 070 } 071 }