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    }