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
* [EMAIL PROTECTED]
*
* 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 <[EMAIL PROTECTED]>
* @author Paul Smith <[EMAIL PROTECTED]>
*
*/
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 "";
}
}
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