errormanager.java

java源代码 请看看啊 提点宝贵的意见

/*
 * @(#)ErrorManager.java	1.5 03/01/23
 *
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */


package java.util.logging;

/**
 * ErrorManager objects can be attached to Handlers to process
 * any error that occur on a Handler during Logging.
 * <p>
 * When processing logging output, if a Handler encounters problems
 * then rather than throwing an Exception back to the issuer of the
 * the logging call (who is unlikely to be interested) the Handler
 * should call its associated ErrorManager.
 */

public class ErrorManager {
   private boolean reported = false;

    /*
     * We declare standard error codes for important categories of errors.
     */

    /**
     * GENERIC_FAILURE is used for failure that don't fit
     * into one of the other catgories.
     */    
    public final static int GENERIC_FAILURE = 0;
    /**
     * WRITE_FAILURE is used when a write to an output stream fails.
     */    
    public final static int WRITE_FAILURE = 1;
    /**
     * FLUSH_FAILURE is used when a flush to an output stream fails.
     */    
    public final static int FLUSH_FAILURE = 2;
    /**
     * CLOSE_FAILURE is used when a close of an output stream fails.
     */    
    public final static int CLOSE_FAILURE = 3;
    /**
     * OPEN_FAILURE is used when an open of an output stream fails.
     */    
    public final static int OPEN_FAILURE = 4;
    /**
     * FORMAT_FAILURE is used when formatting fails for any reason.
     */    
    public final static int FORMAT_FAILURE = 5;

    /**
     * The error method is called when a Handler failure occurs.
     * <p>
     * This method may be overriden in subclasses.  The default
     * behavior in this base class is that the first call is
     * reported to System.err, and subsequent calls are ignored.
     *
     * @param msg    a descriptive string (may be null)
     * @param ex     an exception (may be null)
     * @param code   an error code defined in ErrorManager
     */
    public synchronized void error(String msg, Exception ex, int code) {
	if (reported) {
	    // We only report the first error, to avoid clogging
	    // the screen.
	    return;
	}	
	reported = true;
	String text = "java.util.logging.ErrorManager: " + code;
	if (msg != null) {
	    text = text + ": " + msg;
	}
	System.err.println(text);
	if (ex != null) {
	    ex.printStackTrace();
	}
    }
}