| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache license, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the license for the specific language governing permissions and |
| * limitations under the license. |
| */ |
| package org.apache.logging.log4j.core.lookup; |
| |
| import org.apache.logging.log4j.Logger; |
| import org.apache.logging.log4j.Marker; |
| import org.apache.logging.log4j.MarkerManager; |
| import org.apache.logging.log4j.core.LogEvent; |
| import org.apache.logging.log4j.core.config.plugins.Plugin; |
| import org.apache.logging.log4j.status.StatusLogger; |
| |
| /** |
| * Looks up keys from system properties. |
| */ |
| @Plugin(name = "sys", category = StrLookup.CATEGORY) |
| public class SystemPropertiesLookup extends AbstractLookup { |
| |
| private static final Logger LOGGER = StatusLogger.getLogger(); |
| private static final Marker LOOKUP = MarkerManager.getMarker("LOOKUP"); |
| |
| /** |
| * Looks up the value for the key from system properties. |
| * @param event The current LogEvent. |
| * @param key the key to be looked up, may be null |
| * @return The value associated with the key. |
| */ |
| @Override |
| public String lookup(final LogEvent event, final String key) { |
| try { |
| return System.getProperty(key); |
| } catch (final Exception ex) { |
| LOGGER.warn(LOOKUP, "Error while getting system property [{}].", key, ex); |
| return null; |
| } |
| } |
| } |