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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  import org.apache.logging.log4j.Marker;
    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(final Object level) {
    45          this.level = level;
    46      }
    47
    48      public final void setMarker(final Marker marker) {
    49          this.marker = marker;
    50      }
    51
    52      @Override
    53      public int doStartTag() throws JspException {
    54          final 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  }