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.taglib; 018 019 import javax.servlet.jsp.JspException; 020 import javax.servlet.jsp.tagext.Tag; 021 022 import org.apache.logging.log4j.Level; 023 024 /** 025 * This class implements the {@code <log:exit>} tag. 026 * 027 * @since 2.0 028 */ 029 public class ExitTag extends LoggerAwareTagSupport { 030 private static final long serialVersionUID = 1L; 031 032 private static final String FQCN = ExitTag.class.getName(); 033 034 private transient Object result; 035 036 @Override 037 protected void init() { 038 super.init(); 039 this.result = null; 040 } 041 042 public void setResult(final Object result) { 043 this.result = result; 044 } 045 046 @Override 047 public int doEndTag() throws JspException { 048 final Log4jTaglibLogger logger = this.getLogger(); 049 050 if (TagUtils.isEnabled(logger, Level.TRACE, null)) { 051 if (this.result == null) { 052 logger.exit(FQCN, null); 053 } else { 054 logger.exit(FQCN, this.result); 055 } 056 } 057 058 return Tag.EVAL_PAGE; 059 } 060 }