1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache license, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the license for the specific language governing permissions and 15 * limitations under the license. 16 */ 17 package org.apache.logging.log4j.core.appender.rewrite; 18 19 import org.apache.logging.log4j.core.LogEvent; 20 21 /** 22 * Interface to be implemented by components that support modifications to the LogEvent. 23 */ 24 25 public interface RewritePolicy { 26 /** 27 * Rewrite a logging event. 28 * @param source a logging event that may be returned or 29 * used to create a new logging event. 30 * @return a logging event or null to suppress processing. 31 */ 32 LogEvent rewrite(final LogEvent source); 33 }