cvs commit: logging-log4j/src/java/org/apache/log4j/varia PropertyFilter.java

[sd...@apache.org]

sdeboy      2004/07/20 22:40:53

  Added:       src/java/org/apache/log4j/varia PropertyFilter.java
  Log:
  new filter - propertyFilter enables the definition of arbitrary name/value properties which are set on each event processed by the filter (appender level).  Provides functionality similar to the network appenders' ability to specify the 'application' property but for any number of name/value pairs, from outside the appender.
  
  Revision  Changes    Path
  1.1                  logging-log4j/src/java/org/apache/log4j/varia/PropertyFilter.java
  
  Index: PropertyFilter.java
  ===================================================================
  /*
   * Copyright 1999,2004 The Apache Software Foundation.
   * 
   * Licensed 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.log4j.varia;
  
  import java.util.Hashtable;
  import java.util.Map;
  import java.util.StringTokenizer;
  
  import org.apache.log4j.spi.Filter;
  import org.apache.log4j.spi.LoggingEvent;
  
  /**
   * NOTE: This filter modifies logging events by adding properties to the event.
   * 
   * The 'properties' param is converted to event properties, which are 
   * set on every event processed by the filter.
   * 
   * This class relies on the convention that property name/value pairs are 
   * equals-symbol delimited, and each name/value pair is comma-delimited
   * 
   * Example properties param:
   * somename=somevalue,anothername=anothervalue,thirdname=third value
   * 
   * @since 1.3
   */
  public class PropertyFilter extends Filter {
  	private Hashtable properties;
  	public void setProperties(String props) {
  		properties = parseProperties(props);
  	}
  	
  	public int decide(LoggingEvent event) {
  		Map eventProps = event.getProperties();
  		if (eventProps == null) {
  			eventProps = new Hashtable();
  		} else {
  			eventProps = new Hashtable(properties);
  		}
  		properties.putAll(eventProps);
  	
  		event.setProperties(properties);
  		return Filter.NEUTRAL;
  	}
  	
  	private Hashtable parseProperties(String props) {
  		Hashtable hashTable = new Hashtable();
  		StringTokenizer pairs = new StringTokenizer(props, ",");
  		while (pairs.hasMoreTokens()) {
  			StringTokenizer entry = new StringTokenizer(pairs.nextToken(), "=");
  			hashTable.put(entry.nextElement().toString().trim(), entry.nextElement().toString().trim());
  		}
  		return hashTable;
  	}
  }
  
  
  

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