logwrapperbase.java

java1.6众多例子参考

/*
 * @(#)LogWrapperBase.java	1.10 05/11/17
 * 
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.corba.se.spi.logging ;

import java.util.logging.Level ;
import java.util.logging.Logger ;
import java.util.logging.LogRecord ;

public abstract class LogWrapperBase {
    protected Logger logger ;

    protected String loggerName ;

    protected LogWrapperBase( Logger logger ) 
    {
	this.logger = logger ;
        this.loggerName = logger.getName( );
    }

    protected void doLog( Level level, String key, Object[] params, Class wrapperClass,
	Throwable thr ) 
    {
	LogRecord lrec = new LogRecord( level, key ) ;
	if (params != null)
	    lrec.setParameters( params ) ;
	inferCaller( wrapperClass, lrec ) ;
	lrec.setThrown( thr ) ;
        lrec.setLoggerName( loggerName );
	lrec.setResourceBundle( logger.getResourceBundle() ) ;
	logger.log( lrec ) ;
    }

    private void inferCaller( Class wrapperClass, LogRecord lrec ) 
    {
	// Private method to infer the caller's class and method names

	// Get the stack trace.
	StackTraceElement stack[] = (new Throwable()).getStackTrace();
	StackTraceElement frame = null ;
	String wcname = wrapperClass.getName() ;
	String baseName = LogWrapperBase.class.getName() ;

	// The top of the stack should always be a method in the wrapper class, 
	// or in this base class.
	// Search back to the first method not in the wrapper class or this class.
	int ix = 0;
	while (ix < stack.length) {
	    frame = stack[ix];
	    String cname = frame.getClassName();
	    if (!cname.equals(wcname) && !cname.equals(baseName))  {
		break;
	    }

	    ix++;
	}

	// Set the class and method if we are not past the end of the stack
	// trace
	if (ix < stack.length) {
	    lrec.setSourceClassName(frame.getClassName());
	    lrec.setSourceMethodName(frame.getMethodName());
	}
    }

    protected void doLog( Level level, String key, Class wrapperClass, Throwable thr ) 
    {
	doLog( level, key, null, wrapperClass, thr ) ;
    }
}