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 import org.apache.logging.log4j.Marker;
21
22 import javax.servlet.jsp.JspException;
23 import javax.servlet.jsp.tagext.Tag;
24
25 /**
26 * This class implements the {@code <log:ifEnabled>} tag.
27 *
28 * @since 2.0
29 */
30 public class IfEnabledTag extends LoggerAwareTagSupport {
31 private static final long serialVersionUID = 1L;
32
33 private transient Object level;
34
35 private Marker marker;
36
37 @Override
38 protected void init() {
39 super.init();
40 this.level = null;
41 this.marker = null;
42 }
43
44 public final void setLevel(Object level) {
45 this.level = level;
46 }
47
48 public final void setMarker(Marker marker) {
49 this.marker = marker;
50 }
51
52 @Override
53 public int doStartTag() throws JspException {
54 Level level = TagUtils.resolveLevel(this.level);
55 if (level == null) {
56 throw new JspException("Level must be of type String or org.apache.logging.log4j.Level.");
57 }
58
59 return TagUtils.isEnabled(this.getLogger(), level, this.marker) ? Tag.EVAL_BODY_INCLUDE : Tag.SKIP_BODY;
60 }
61 }