    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    }