001/* 002 * Copyright (c) 2007-2016 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.property; 022 023import java.util.HashMap; 024import java.util.HashSet; 025import java.util.Map; 026import java.util.Properties; 027import java.util.Set; 028 029import cascading.flow.planner.ScopedElement; 030 031import static cascading.util.Util.isEmpty; 032 033/** Class PropertyUtil is a static helper class for handling properties. */ 034public class PropertyUtil 035 { 036 public static String getProperty( Map<Object, Object> properties, String property ) 037 { 038 return getProperty( properties, property, (String) null ); 039 } 040 041 public static int getIntProperty( Map<Object, Object> properties, String property, int defaultValue ) 042 { 043 return getIntProperty( System.getProperties(), properties, property, defaultValue ); 044 } 045 046 public static int getIntProperty( Properties defaultProperties, Map<Object, Object> properties, String property, int defaultValue ) 047 { 048 String result; 049 050 if( defaultProperties == null ) 051 result = getProperty( properties, property ); 052 else 053 result = getProperty( properties, property, defaultProperties.getProperty( property ) ); 054 055 if( isEmpty( result ) ) 056 return defaultValue; 057 058 return Integer.parseInt( result ); 059 } 060 061 public static String getStringProperty( Map<Object, Object> properties, String property ) 062 { 063 return getStringProperty( System.getProperties(), properties, property ); 064 } 065 066 public static String getStringProperty( Properties defaultProperties, Map<Object, Object> properties, String property ) 067 { 068 if( defaultProperties == null ) 069 return getProperty( properties, property ); 070 071 return getProperty( properties, property, defaultProperties.getProperty( property ) ); 072 } 073 074 public static <A> A getProperty( Map<Object, Object> properties, String key, A defaultValue ) 075 { 076 if( properties == null ) 077 return defaultValue; 078 079 A value; 080 081 if( properties instanceof Properties ) 082 value = (A) ( (Properties) properties ).getProperty( key ); 083 else 084 value = (A) properties.get( key ); 085 086 return value == null ? defaultValue : value; 087 } 088 089 public static String getProperty( final Map<Object, Object> properties, ScopedElement flowElement, String property ) 090 { 091 if( flowElement.hasConfigDef() ) 092 return PropertyUtil.getProperty( properties, flowElement.getConfigDef(), property ); 093 094 return PropertyUtil.getProperty( properties, property ); 095 } 096 097 public static String getProperty( final Map<Object, Object> properties, ConfigDef configDef, String property ) 098 { 099 return configDef.apply( property, new ConfigDef.Getter() 100 { 101 @Override 102 public String update( String key, String value ) 103 { 104 return value; 105 } 106 107 @Override 108 public String get( String key ) 109 { 110 return getProperty( properties, key ); 111 } 112 } ); 113 } 114 115 public static void setProperty( Map<Object, Object> properties, String key, String value ) 116 { 117 if( properties == null || value == null || value.isEmpty() ) 118 return; 119 120 if( properties instanceof Properties ) 121 ( (Properties) properties ).setProperty( key, value ); 122 else 123 properties.put( key, value ); 124 } 125 126 public static Properties createProperties( Iterable<Map.Entry<String, String>> defaultProperties ) 127 { 128 Properties properties = new Properties(); 129 130 for( Map.Entry<String, String> property : defaultProperties ) 131 properties.setProperty( property.getKey(), property.getValue() ); 132 133 return properties; 134 } 135 136 public static Properties createProperties( Map<Object, Object> properties, Properties defaultProperties ) 137 { 138 Properties results = defaultProperties == null ? new Properties() : new Properties( defaultProperties ); 139 140 if( properties == null ) 141 return results; 142 143 Set<Object> keys = new HashSet<Object>( properties.keySet() ); 144 145 // keys will only be grabbed if both key/value are String, so keep orig keys 146 if( properties instanceof Properties ) 147 keys.addAll( ( (Properties) properties ).stringPropertyNames() ); 148 149 for( Object key : keys ) 150 { 151 Object value = properties.get( key ); 152 153 if( value == null && properties instanceof Properties && key instanceof String ) 154 value = ( (Properties) properties ).getProperty( (String) key ); 155 156 if( value == null ) // don't stuff null values 157 continue; 158 159 // don't let these objects pass, even though toString is called below. 160 if( value instanceof Class ) 161 continue; 162 163 results.setProperty( key.toString(), value.toString() ); 164 } 165 166 return results; 167 } 168 169 public static Map<Object, Object> asFlatMap( Map<Object, Object> properties ) 170 { 171 if( !( properties instanceof Properties ) ) 172 return properties; 173 174 Map<Object, Object> map = new HashMap<>(); 175 Properties props = (Properties) properties; 176 177 for( String property : props.stringPropertyNames() ) 178 map.put( property, props.getProperty( property ) ); 179 180 return map; 181 } 182 }