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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.taglib;
18  
19  import javax.servlet.jsp.JspException;
20  import javax.servlet.jsp.tagext.Tag;
21  
22  import org.apache.logging.log4j.Level;
23  
24  /**
25   * This class implements the {@code <log:exit>} tag.
26   *
27   * @since 2.0
28   */
29  public class ExitTag extends LoggerAwareTagSupport {
30      private static final long serialVersionUID = 1L;
31  
32      private static final String FQCN = ExitTag.class.getName();
33  
34      private transient Object result;
35  
36      @Override
37      protected void init() {
38          super.init();
39          this.result = null;
40      }
41  
42      public void setResult(final Object result) {
43          this.result = result;
44      }
45  
46      @Override
47      public int doEndTag() throws JspException {
48          final Log4jTaglibLogger logger = this.getLogger();
49  
50          if (TagUtils.isEnabled(logger, Level.TRACE, null)) {
51              if (this.result == null) {
52                  logger.exit(FQCN, null);
53              } else {
54                  logger.exit(FQCN, this.result);
55              }
56          }
57  
58          return Tag.EVAL_PAGE;
59      }
60  }