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 */ 017package org.apache.logging.log4j.core.appender.rewrite; 018 019import org.apache.logging.log4j.core.LogEvent; 020 021/** 022 * Interface to be implemented by components that support modifications to the LogEvent. 023 */ 024 025public interface RewritePolicy { 026 /** 027 * Rewrite a logging event. 028 * @param source a logging event that may be returned or 029 * used to create a new logging event. 030 * @return a logging event or null to suppress processing. 031 */ 032 LogEvent rewrite(final LogEvent source); 033}