naming/util/LogOutputStream.java

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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
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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;
    }
    }
}