/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache license, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License. You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the license for the specific language governing permissions and
   * limitations under the license.
   */
  package org.apache.logging.log4j.taglib;
  
  import javax.servlet.jsp.JspException;
  import javax.servlet.jsp.PageContext;
  import javax.servlet.jsp.tagext.BodyTagSupport;
  
  /**
   * An abstract class for all tags that are logger-aware.
   *
   * @since 2.0
   */
  abstract class LoggerAwareTagSupport extends BodyTagSupport {
      private static final long serialVersionUID = 1L;
  
      private transient Log4jTaglibLoggerContext loggerContext;
  
      private transient Object logger;
  
      protected LoggerAwareTagSupport() {
          this.init();
      }
  
      protected void init() {
          this.logger = null;
      }
  
      @Override
      public final void release() {
          super.release();
          this.init();
      }
  
      @Override
      public final void setPageContext(final PageContext pageContext) {
          super.setPageContext(pageContext);
          this.loggerContext = Log4jTaglibLoggerContext.getInstance(pageContext.getServletContext());
      }
  
      protected final Log4jTaglibLogger getLogger() throws JspException {
          if (this.logger != null) {
              return TagUtils.resolveLogger(this.loggerContext, this.logger, null);
          }
          Log4jTaglibLogger logger = TagUtils.getDefaultLogger(this.pageContext);
          if (logger == null) {
              final String name = this.pageContext.getPage().getClass().getName();
              logger = TagUtils.resolveLogger(this.loggerContext, name, null);
              TagUtils.setDefaultLogger(this.pageContext, logger);
          }
          return logger;
      }
  
      public final void setLogger(final Object logger) {
          this.logger = logger;
      }
  }