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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements. See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache license, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License. You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the license for the specific language governing permissions and
    15   * limitations under the license.
    16   */
    17  package org.apache.logging.log4j.taglib;
    18
    19  import java.util.ArrayList;
    20  import java.util.List;
    21
    22  import javax.servlet.jsp.JspException;
    23  import javax.servlet.jsp.tagext.DynamicAttributes;
    24  import javax.servlet.jsp.tagext.Tag;
    25
    26  import org.apache.logging.log4j.Level;
    27
    28  /**
    29   * This class implements the {@code <log:entry>} tag.
    30   *
    31   * @since 2.0
    32   */
    33  public class EntryTag extends LoggerAwareTagSupport implements DynamicAttributes {
    34      private static final long serialVersionUID = 1L;
    35
    36      private static final String FQCN = EntryTag.class.getName();
    37
    38      private List<Object> attributes;
    39
    40      @Override
    41      protected void init() {
    42          super.init();
    43          if (this.attributes == null) {
    44              this.attributes = new ArrayList<Object>();
    45          } else {
    46              this.attributes.clear();
    47          }
    48      }
    49
    50      @Override
    51      public void setDynamicAttribute(final String uri, final String name, final Object value) {
    52          this.attributes.add(value);
    53      }
    54
    55      @Override
    56      public int doEndTag() throws JspException {
    57          final Log4jTaglibLogger logger = this.getLogger();
    58
    59          if (TagUtils.isEnabled(logger, Level.TRACE, null)) {
    60              if (this.attributes.size() == 0) {
    61                  logger.entry(FQCN);
    62              } else {
    63                  logger.entry(FQCN, this.attributes.toArray());
    64              }
    65          }
    66
    67          return Tag.EVAL_PAGE;
    68      }
    69  }