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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 java.util.ArrayList;
20  import java.util.List;
21  
22  import javax.servlet.jsp.JspException;
23  import javax.servlet.jsp.tagext.DynamicAttributes;
24  import javax.servlet.jsp.tagext.Tag;
25  
26  import org.apache.logging.log4j.Level;
27  
28  /**
29   * This class implements the {@code <log:entry>} tag.
30   *
31   * @since 2.0
32   */
33  public class EntryTag extends LoggerAwareTagSupport implements DynamicAttributes {
34      private static final long serialVersionUID = 1L;
35  
36      private static final String FQCN = EntryTag.class.getName();
37  
38      private List<Object> attributes;
39  
40      @Override
41      protected void init() {
42          super.init();
43          if (this.attributes == null) {
44              this.attributes = new ArrayList<Object>();
45          } else {
46              this.attributes.clear();
47          }
48      }
49  
50      @Override
51      public void setDynamicAttribute(final String uri, final String name, final Object value) {
52          this.attributes.add(value);
53      }
54  
55      @Override
56      public int doEndTag() throws JspException {
57          final Log4jTaglibLogger logger = this.getLogger();
58  
59          if (TagUtils.isEnabled(logger, Level.TRACE, null)) {
60              if (this.attributes.size() == 0) {
61                  logger.entry(FQCN);
62              } else {
63                  logger.entry(FQCN, this.attributes.toArray());
64              }
65          }
66  
67          return Tag.EVAL_PAGE;
68      }
69  }