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 */
017package org.apache.logging.log4j.taglib;
018
019import java.util.ArrayList;
020import java.util.List;
021import javax.servlet.jsp.JspException;
022import javax.servlet.jsp.tagext.DynamicAttributes;
023import javax.servlet.jsp.tagext.Tag;
024
025import org.apache.logging.log4j.Level;
026
027/**
028 * This class implements the {@code <log:entry>} tag.
029 *
030 * @since 2.0
031 */
032public 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}