logging-log4j-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From sde...@apache.org
Subject cvs commit: jakarta-log4j/src/java/org/apache/log4j/chainsaw LoggingEventFieldResolver.java
Date Tue, 16 Sep 2003 05:18:50 GMT
sdeboy      2003/09/15 22:18:50

  Added:       src/java/org/apache/log4j/chainsaw
                        LoggingEventFieldResolver.java
  Log:
  Added helper class which will be used in the evaluation of postfix expressions.
  
  Revision  Changes    Path
  1.1                  jakarta-log4j/src/java/org/apache/log4j/chainsaw/LoggingEventFieldResolver.java
  
  Index: LoggingEventFieldResolver.java
  ===================================================================
  /*
   * ============================================================================
   *                   The Apache Software License, Version 1.1
   * ============================================================================
   *
   *    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modifica-
   * tion, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of  source code must  retain the above copyright  notice,
   *    this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * 3. The end-user documentation included with the redistribution, if any, must
   *    include  the following  acknowledgment:  "This product includes  software
   *    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
   *    Alternately, this  acknowledgment may  appear in the software itself,  if
   *    and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "log4j" and  "Apache Software Foundation"  must not be used to
   *    endorse  or promote  products derived  from this  software without  prior
   *    written permission. For written permission, please contact
   *    apache@apache.org.
   *
   * 5. Products  derived from this software may not  be called "Apache", nor may
   *    "Apache" appear  in their name,  without prior written permission  of the
   *    Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
   * APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
   * INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
   * DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
   * ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
   * (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * This software  consists of voluntary contributions made  by many individuals
   * on  behalf of the Apache Software  Foundation.  For more  information on the
   * Apache Software Foundation, please see <http://www.apache.org/>.
   *
   */
  
  package org.apache.log4j.chainsaw;
  
  import org.apache.log4j.spi.LoggingEvent;
  
  /**
   * A singleton helper utility which accepts a field name and a LoggingEvent and returns
the 
   * String value of that field.
   * 
   * This class defines a grammar used in creation of an expression-based Rule.
   * 
   * Here is a description of the mapping of field names in the grammar 
   * to fields on the logging event:
   * 
   * Field Name		Field value (String representation
   * LOGGER			category name (logger)
   * LEVEL			level
   * CLASS			locationInformation's class name
   * FILE				locationInformation's file name
   * LINE				locationInformation's line number
   * METHOD			locationInformation's method name
   * MSG				message
   * NDC				NDC
   * EXCEPTION		throwable string representation
   * TIMESTAMP		timestamp
   * THREAD			thread
   * MDC.keyName		entry in the MDC hashtable mapped to key 'keyName'
   * PROP.keyName		entry in the Property hashtable mapped to the key 'keyName'
   * 
   * If the passed-in field is null or does not match an entry in the above-described 
   * mapping, an empty string is returned.
   * 
   * @author Scott Deboy <sdeboy@apache.org>
   * @author Paul Smith <psmith@apache.org>
   *
   */
  
  public final class LoggingEventFieldResolver {
  	private static final LoggingEventFieldResolver resolver = new LoggingEventFieldResolver();
  	
  	private LoggingEventFieldResolver(){}
  	
  	public static LoggingEventFieldResolver getInstance() {
  		return resolver;
  	}
  
  	public String getValue(String fieldName, LoggingEvent event) {
  		if (fieldName == null) {
  			return "";
  		}
  		String lowerProp = fieldName.toUpperCase();
  		if ("LOGGER".equals(fieldName)) {
  			return event.getLoggerName();
  		} else if ("LEVEL".equals(fieldName)) {
  			return event.getLevel().toString();
  		} else if ("CLASS".equals(fieldName)) {
  			return event.getLocationInformation().getClassName();
  		} else if ("FILE".equals(fieldName)) {
  			return event.getLocationInformation().getFileName();
  		} else if ("LINE".equals(fieldName)) {
  			return event.getLocationInformation().getLineNumber();
  		} else if ("METHOD".equals(fieldName)) {
  			return event.getLocationInformation().getMethodName();
  		} else if ("MSG".equals(fieldName)) {
  			return event.getMessage().toString();
  		} else if ("NDC".equals(fieldName)) {
  			return event.getNDC();
  		} else if ("EXCEPTION".equals(fieldName)) {
  			StringBuffer buf = new StringBuffer();
  			for (int i=0;i<event.getThrowableStrRep().length;i++) {
  				buf.append(event.getThrowableStrRep()[i]);
  				buf.append("");
  			}
  			return buf.toString();
  		} else if ("TIMESTAMP".equals(fieldName)) {
  			return String.valueOf(event.timeStamp);
  		} else if ("THREAD".equals(fieldName)) {
  			return event.getThreadName();
  		} else if (fieldName.startsWith("MDC.")) {
  			return event.getMDC(fieldName.substring(4)).toString();
  		} else if (fieldName.startsWith("PROP.")) {
  			return event.getProperty(fieldName.substring(5));
  		}
  		return "";
  	}
  }
  
  
  

---------------------------------------------------------------------
To unsubscribe, e-mail: log4j-dev-unsubscribe@jakarta.apache.org
For additional commands, e-mail: log4j-dev-help@jakarta.apache.org


Mime
View raw message