Glassfish example source code file (LogOutputStream.java)

This example Glassfish source code file (LogOutputStream.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

io, ioexception, ioexception, level, level, log, logger, logging, logoutputstream, logoutputstream, outputstream, string, string

The Glassfish LogOutputStream.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.naming.util;

import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Capture output lines and send them to the system error log.
 */
public class LogOutputStream extends OutputStream {
    protected Logger logger;
    protected Level level;

    private int lastb = -1;
    private byte[] buf = new byte[80];
    private int pos = 0;

    /**
     * Log to the specified facility at the default FINE level.
     */
    public LogOutputStream(String facility) {
	this(facility, Level.FINE);
    }

    /**
     * Log to the specified facility at the specified level.
     */
    public LogOutputStream(String facility, Level level) {
	logger = Logger.getLogger(facility);
	this.level = level;
    }

    public void write(int b) throws IOException {
	if (!logger.isLoggable(level))
	    return;

	if (b == '\r') {
	    logBuf();
	} else if (b == '\n') {
	    if (lastb != '\r')
		logBuf();
	} else {
	    expandCapacity(1);
	    buf[pos++] = (byte)b;
	}
	lastb = b;
    }

    public void write(byte b[]) throws IOException {
	write(b, 0, b.length);
    }

    public void write(byte b[], int off, int len) throws IOException {
	int start = off;
	
	if (!logger.isLoggable(level))
	    return;
	len += off;
	for (int i = start; i < len ; i++) {
	    if (b[i] == '\r') {
		expandCapacity(i - start);
		System.arraycopy(b, start, buf, pos, i - start);
		pos += i - start;
		logBuf();
		start = i + 1;
	    } else if (b[i] == '\n') {
		if (lastb != '\r') {
		    expandCapacity(i - start);
		    System.arraycopy(b, start, buf, pos, i - start);
		    pos += i - start;
		    logBuf();
		}
		start = i + 1;
	    }
	    lastb = b[i];
	}
	if ((len - start) > 0) {
	    expandCapacity(len - start);
	    System.arraycopy(b, start, buf, pos, len - start);
	    pos += len - start;
	}
    }

    /**
     * Log the specified message.
     * Can be overridden by subclass to do different logging.
     */
    protected void log(String msg) {
	logger.log(level, msg);
    }

    /**
     * Convert the buffer to a string and log it.
     */
    private void logBuf() {
	String msg = new String(buf, 0, pos);
	pos = 0;
	log(msg);
    }

    /**
     * Ensure that the buffer can hold at least len bytes
     * beyond the current position.
     */
    private void expandCapacity(int len) {
	while (pos + len > buf.length) {
	    byte[] nb = new byte[buf.length * 2];
	    System.arraycopy(buf, 0, nb, 0, pos);
	    buf = nb;
	}
    }
}