    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 java.util.ArrayList;
    020    import java.util.List;
    021
    022    import javax.servlet.jsp.JspException;
    023    import javax.servlet.jsp.tagext.DynamicAttributes;
    024    import javax.servlet.jsp.tagext.Tag;
    025
    026    import org.apache.logging.log4j.Level;
    027
    028    /**
    029     * This class implements the {@code <log:entry>} tag.
    030     *
    031     * @since 2.0
    032     */
    033    public class EntryTag extends LoggerAwareTagSupport implements DynamicAttributes {
    034        private static final long serialVersionUID = 1L;
    035
    036        private static final String FQCN = EntryTag.class.getName();
    037
    038        private List<Object> attributes;
    039
    040        @Override
    041        protected void init() {
    042            super.init();
    043            if (this.attributes == null) {
    044                this.attributes = new ArrayList<Object>();
    045            } else {
    046                this.attributes.clear();
    047            }
    048        }
    049
    050        @Override
    051        public void setDynamicAttribute(final String uri, final String name, final Object value) {
    052            this.attributes.add(value);
    053        }
    054
    055        @Override
    056        public int doEndTag() throws JspException {
    057            final Log4jTaglibLogger logger = this.getLogger();
    058
    059            if (TagUtils.isEnabled(logger, Level.TRACE, null)) {
    060                if (this.attributes.size() == 0) {
    061                    logger.entry(FQCN);
    062                } else {
    063                    logger.entry(FQCN, this.attributes.toArray());
    064                }
    065            }
    066
    067            return Tag.EVAL_PAGE;
    068        }
    069    }