001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017 package org.apache.logging.log4j.core.config.plugins; 018 019 import org.apache.logging.log4j.core.config.Configuration; 020 import org.apache.logging.log4j.core.config.Property; 021 import org.apache.logging.log4j.core.lookup.Interpolator; 022 import org.apache.logging.log4j.core.lookup.MapLookup; 023 import org.apache.logging.log4j.core.lookup.StrLookup; 024 025 import java.util.HashMap; 026 import java.util.Map; 027 028 /** 029 * Handles properties defined in the configuration. 030 */ 031 @Plugin(name = "properties", category = "Core", printObject = true) 032 public final class PropertiesPlugin { 033 034 private PropertiesPlugin() { 035 } 036 037 /** 038 * Create the Properties component. 039 * @param properties An array of Property elements. 040 * @param config The Configuration. 041 * @return An Interpolator that includes the configuration properties. 042 */ 043 @PluginFactory 044 public static StrLookup configureSubstitutor(@PluginElement("properties") final Property[] properties, 045 @PluginConfiguration final Configuration config) { 046 if (properties == null) { 047 return new Interpolator(null); 048 } 049 final Map<String, String> map = new HashMap<String, String>(config.getProperties()); 050 051 for (final Property prop : properties) { 052 map.put(prop.getName(), prop.getValue()); 053 } 054 055 return new Interpolator(new MapLookup(map)); 056 } 057 }