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 import org.apache.logging.log4j.Marker; 024 025 /** 026 * This class implements the {@code <log:ifEnabled>} tag. 027 * 028 * @since 2.0 029 */ 030 public class IfEnabledTag extends LoggerAwareTagSupport { 031 private static final long serialVersionUID = 1L; 032 033 private transient Object level; 034 035 private Marker marker; 036 037 @Override 038 protected void init() { 039 super.init(); 040 this.level = null; 041 this.marker = null; 042 } 043 044 public final void setLevel(final Object level) { 045 this.level = level; 046 } 047 048 public final void setMarker(final Marker marker) { 049 this.marker = marker; 050 } 051 052 @Override 053 public int doStartTag() throws JspException { 054 final Level level = TagUtils.resolveLevel(this.level); 055 if (level == null) { 056 throw new JspException("Level must be of type String or org.apache.logging.log4j.Level."); 057 } 058 059 return TagUtils.isEnabled(this.getLogger(), level, this.marker) ? Tag.EVAL_BODY_INCLUDE : Tag.SKIP_BODY; 060 } 061 }