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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 org.apache.logging.log4j.Level;
20  
21  import javax.servlet.jsp.JspException;
22  import javax.servlet.jsp.tagext.DynamicAttributes;
23  import javax.servlet.jsp.tagext.Tag;
24  import java.util.ArrayList;
25  import java.util.List;
26  
27  /**
28   * This class implements the {@code <log:entry>} tag.
29   *
30   * @since 2.0
31   */
32  public class EntryTag extends LoggerAwareTagSupport implements DynamicAttributes {
33      private static final long serialVersionUID = 1L;
34  
35      private static final String FQCN = EntryTag.class.getName();
36  
37      private List<Object> attributes;
38  
39      @Override
40      protected void init() {
41          super.init();
42          if (this.attributes == null) {
43              this.attributes = new ArrayList<Object>();
44          } else {
45              this.attributes.clear();
46          }
47      }
48  
49      public void setDynamicAttribute(String uri, String name, Object value) {
50          this.attributes.add(value);
51      }
52  
53      @Override
54      public int doEndTag() throws JspException {
55          Log4jTaglibLogger logger = this.getLogger();
56  
57          if (TagUtils.isEnabled(logger, Level.TRACE, null)) {
58              if (this.attributes.size() == 0) {
59                  logger.entry(FQCN);
60              } else {
61                  logger.entry(FQCN, this.attributes.toArray());
62              }
63          }
64  
65          return Tag.EVAL_PAGE;
66      }
67  }