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